What is the Automatic Disconnecting Differential (ADD) for 4WD models and how is it removed and installed on 2003 through 2009 Toyota 4Runner?

The Automatic Disconnecting Differential (ADD) system is responsible for connecting the power flow through the left axle shaft in 4WD mode and disconnecting it in 2WD mode. While ADD offers convenience in selecting 2WD or 4WD without dealing with locking hubs, it increases wear on CV joints, CV Boot, and certain axle and differential components that rotate even in 2WD. Regular inspection of CV joints and boots is recommended for ADD-equipped vehicles. If issues arise during shifting into or out of 4WD, it's advisable to have the ADD system checked by a qualified repair shop or dealer service department specializing in 4WD vehicles. For differential carrier removal, begin by loosening the wheel lug nuts, and raising and securely supporting the vehicle on jack stands. Remove engine splash shields, and driveaxles, and drain the lubricant from the differential. Disconnect the driveshaft from the front differential and support the front end with wire. Proceed to remove the front stabilizer bar, brackets, front wheel speed sensors, and front tie rod ends, and separate the lower control arms from the steering knuckles. Disconnect the breather tube bracket, detach the fasteners retaining the vacuum tubing bracket, unplug the actuator electrical connector, and detach the actuator vacuum hoses. Remove the tube and wire harness assembly from the differential. Support the differential with a transmission jack or floor jack, remove the differential rear mounting nut and the two front mounting bolts/nuts, and lower the differential. For installation, follow the reverse order of removal. Refill the differential with the appropriate lubricant and tighten the lug nuts to the specified torque. To remove the ADD actuator, raise the vehicle and support it securely on jack stands. Remove the splash shields and the four retaining bolts. Take out the actuator. Before installing the actuator, clean off the old RTV sealant from the mating surfaces of the differential and the actuator, and apply a thin bead of new RTV sealant to those surfaces. During installation, tighten the bolts according to specifications, and reverse the steps of removal.

Genuine Toyota 4Runner Differential

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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-35C60
$1740.98 MSRP: $2562.72
You Save: $821.74 (33%)
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear; Carrier Assembly, Differential Carrier
- Manufacturer Note: *FGR=41:11=3.727
- Position: Rear
- Replaces: 41110-3D470
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2009 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L | 1GRFE, 2UZFE; 1GRFE, 2UZFE; GRN210L-GKAGKA, GRN210L-GKAZKA, UZN210L-GKAGKA, UZN210L-GKAZKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-35890
$1393.50 MSRP: $2051.23
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Position: Rear
- Replaced by: 41110-35891
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2002 Toyota 4Runner | LULI, SR5B, SR5V | 4 Cyl 2.7L, 6 Cyl 3.4L | 3RZFE, 5VZFE; 3RZFE, 5VZFE; RZN180L-GKMSKA, RZN185L-GKMSKA, RZN185L-GKPSKA, VZN180L-GKPGKA, VZN180L-GKPSKA, VZN180L-GKPZKA, VZN185L-GKMGKA, VZN185L-GKPGKA, VZN185L-GKPSKA, VZN185L-GKPZKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-35270
$1363.56 MSRP: $2007.15
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear; Carrier Assembly, Differential Carrier
- Position: Rear
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1984-1995 Toyota 4Runner | DLX, SR5, STD | 4 Cyl 2.4L | 22R, 22RE, 22REC, 2L; 22R, 22RE, 22REC, 2L; LN51L-KRA, LN51L-KRA3, RN50L-MSEA, RN50L-MSEA3, RN50L-SRA, RN50L-SREA, RN55L-MSCEA, RN55L-MSCEA3, RN55L-MSCEK, RN55L-MSEA, RN55L-MSEA3, RN55L-MSEK, RN55L-PSCEA, RN55L-PSCEA3, RN55L-PSCEK, RN55L-PSEA3, RN55L-SDA, RN55L-SDEA, RN55L-SDEA3, RN55L-SRA, RN55L-SREA, RN55L-SREK, RN55L-SRK, RN70L-SDCA3, RN70L-SDCEA3, RN70L-SRCA, RN70L-SRCEA, RN70L-SRCEA3, RN70L-SRCEK, RN70L-SRCK, RN80L-TRMDEA, RN80L-TRMDEA3, RN80L-TRMDEAB, RN80L-TRMREA, RN80L-TRMREAB, RN80L-TRMREK, RN85L-TRMDEA, RN85L-TRMDEA3, RN85L-TRMDEK, RN85L-TRMSEA, RN85L-TRMSEA3, RN90L-CRMDEA, RN90L-CRMDEA3, RN90L-CRMDEAB, RN90L-CRMDEK, RN90L-CRMSEA, RN90L-CRMSEA3
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Toyota 4Runner Rear Differential Case Sub-Assembly
Part Number: 41302-35020
$347.35 MSRP: $511.29
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Product Specifications
- Other Name: Case Sub-Assembly, Rear Differential
- Position: Rear
- Replaced by: 41302-26010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1985-2009 Toyota 4Runner | DLX, Limited, LULI, SDT, SR5, SR5 Turbo, SR5B, SR5V, STD | 4 Cyl 2.4L, 4 Cyl 2.7L, 6 Cyl 3.0L, 6 Cyl 3.4L, 6 Cyl 4.0L, 8 Cyl 4.7L | 1GRFE, 22RTEC, 2UZFE, 3RZFE, 3VZE, 5VZFE; 1GRFE, 22RTEC, 2UZFE, 3RZFE, 3VZE, 5VZFE; GRN210L-GKAGKA, GRN210L-GKAZKA, GRN210L-GKPGKA, GRN210L-GKPZKA, GRN215L-GKAGKA, GRN215L-GKAZKA, GRN215L-GKPGKA, GRN215L-GKPZKA, RN61LG-PGZA, RN61L-MBZA, RN61L-MBZA3, RN61LV-PGZK, RN66L-MGCZA, RN66L-MGCZA3, RN66L-MGCZK, RN66L-PGCZA, RN66L-PGCZA3, RN66L-PGCZK, RZN180L-GKMSKA, RZN180L-GKPSKA, RZN185L-GKMSKA, RZN185L-GKPSKA, UZN210L-GKAGKA, UZN210L-GKAZKA, UZN215L-GKAGKA, UZN215L-GKAZKA, VZN100L-TRMDEA, VZN100L-TRMDEA3, VZN100L-TRMDEAB, VZN100L-TRMDEK, VZN100L-TRMGEA, VZN100L-TRMGEA3, VZN105L-TRMDEA, VZN105L-TRMDEA3, VZN105L-TRMDEK, VZN105L-TRPDEA, VZN105L-TRPDEA3, VZN110L-CRMDEA, VZN110L-CRMDEA3, VZN110L-CRMDEAB, VZN110L-CRMDEK, VZN110L-CRMGEA, VZN110L-CRMGEA3, VZN110L-CRMGEK, VZN110L-CRPDEA, VZN110L-CRPDEA3, VZN110L-CRPDEAB, VZN110L-CRPDEK, VZN110L-CRPGEA, VZN110L-CRPGEA3, VZN130L-GJMGEA, VZN130L-GJPGEA, VZN130L-GKMGEA, VZN130L-GKPGEA, VZN131L-RJMGEK, VZN131L-RJPGEK, VZN131L-RKMGEK, VZN131L-RKPGEK, VZN180L-GKPGKA, VZN180L-GKPSKA, VZN180L-GKPZKA, VZN185L-GKMGKA, VZN185L-GKPGKA, VZN185L-GKPSKA, VZN185L-GKPZKA, VZN61LG-MSEA, VZN61LG-PSEA, VZN61L-MBEA, VZN61L-MBEA3, VZN61L-MSEA, VZN61L-MSEA3, VZN61LV-MDEA, VZN61LV-MSEA, VZN61LV-MSEK, VZN61LV-PDEA, VZN61LV-PSEA, VZN61LV-PSEK, VZN66L-MDCEA3, VZN66L-MDCEK, VZN66L-MDEA3, VZN66L-MDEK, VZN66L-MSCEA, VZN66L-MSCEA3, VZN66L-MSCEK, VZN66L-PDCEA3, VZN66L-PDEA3, VZN66L-PDEK, VZN66L-PSCEA3, VZN66L-PSCEK, VZN85L-TRMREA6, VZN85L-TRSREA6, VZN85L-TWMREA6, VZN85L-TWSREA6, VZN95L-TWMREA6, VZN95L-TWSREA6, VZN95L-TWSREK6
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Toyota 4Runner Rear Differential Case Sub-Assembly
Part Number: 41301-35200
$600.41 MSRP: $883.81
You Save: $283.40 (33%)
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Product Specifications
- Other Name: Case Sub-Assembly, Rear Differential; Case, Differential Case
- Position: Rear
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2010-2022 Toyota 4Runner | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN285L-GKAGKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-3D470
$1740.98 MSRP: $2562.72
You Save: $821.74 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Manufacturer Note: *FGR=41:11=3.727
- Position: Rear
- Replaced by: 41110-35C60
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2008 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L | 1GRFE, 2UZFE; 1GRFE, 2UZFE; GRN210L-GKAGKA, GRN210L-GKAZKA, UZN210L-GKAGKA, UZN210L-GKAZKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-3D550
$1739.28 MSRP: $2560.22
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Manufacturer Note: *FGR=41:11=3.727
- Position: Rear
- Replaced by: 41110-3D551
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2009 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L | 1GRFE, 2UZFE; 1GRFE, 2UZFE; GRN215L-GKAGKA, GRN215L-GKAZKA, UZN215L-GKAGKA, UZN215L-GKAZKA
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Toyota 4Runner Differential Carrier Assembly
Part Number: 41110-35A92
$1735.92 MSRP: $2555.26
You Save: $819.34 (33%)
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Product Specifications
- Other Name: Carrier Assembly, Differ
- Position: Front
- Replaces: 41110-35A90, 41110-35A91
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2012-2022 Toyota 4Runner | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN285L-GKAGKA
- 2004-2008 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN215L-GKAGKA, GRN215L-GKAZKA, GRN215L-GKPGKA, GRN215L-GKPZKA
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Toyota 4Runner Front Differential Carrier Assembly
Part Number: 41110-3D422
$1322.99 MSRP: $1947.45
You Save: $624.46 (33%)
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Product Specifications
- Other Name: Carrier Assembly, Differential, Front
- Position: Front
- Replaces: 41110-3D421, 41110-3D420
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2022 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L, 8 Cyl 4.7L | 1GRFE, 2UZFE; 1GRFE, 1GRFE; GRN285L-GKAGKA, 2UZFE; GRN285L-GKAGKA, UZN215L-GKAGKA, UZN215L-GKAZKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-35880
$1600.63 MSRP: $2356.13
You Save: $755.50 (33%)
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Manufacturer Note: *FGR=43:11=3.909
- Position: Rear
- Replaced by: 41110-25521
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2002 Toyota 4Runner | SR5B, SR5V | 4 Cyl 2.7L, 6 Cyl 3.4L | 3RZFE, 5VZFE; 3RZFE, 5VZFE; RZN180L-GKPSKA, VZN185L-GKMGKA, VZN185L-GKPGKA, VZN185L-GKPSKA
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Toyota 4Runner Front Differential Carrier Assembly
Part Number: 41110-35360
$1907.68 MSRP: $2808.09
You Save: $900.41 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assy, Differential, Front; Axle Assembly, Carrier, Carrier Assembly
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1991-1995 Toyota 4Runner | DLX | 6 Cyl 3.0L | 3VZE; 3VZE; VZN100L-TRMDEA, VZN100L-TRMDEAB, VZN105L-TRMDEA, VZN110L-CRMDEA, VZN110L-CRMDEAB
- 1985-1989 Toyota 4Runner | DLX, SR5 | 4 Cyl 2.4L | 22REC; 22REC; RN60LG-PDEA, RN60LV-PDEA, RN60LV-PSEK, RN61LG-PDEA, RN61LG-PSEA, RN61LV-PDEA, RN61LV-PDEK, RN61LV-PSEA, RN61LV-PSEK, RN65L-PDCEA, RN65L-PDCEA3, RN65L-PDEA, RN65L-PDEA3, RN65L-PDEK, RN65L-PSCEK, RN66L-PDCEA, RN66L-PDCEA3, RN66L-PDEA, RN66L-PDEA3, RN66L-PDEK, RN66L-PSCEA3, RN66L-PSCEK
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-35D30
$1957.94 MSRP: $2882.07
You Save: $924.13 (33%)
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Product Specifications
- Other Name: Carrier Assembly, Differential, Rear; Carrier Assembly, Differential Carrier
- Position: Rear
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2010-2022 Toyota 4Runner | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN285L-GKAGKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-35C80
$1393.50 MSRP: $2051.23
You Save: $657.73 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assembly, Differential, Rear; Carrier Assembly, Differential Carrier
- Manufacturer Note: *FGR=41:11=3.727
- Position: Rear
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2010-2022 Toyota 4Runner | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN280L-GKAGKA, GRN285L-GKAGKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-3D020
$1393.50 MSRP: $2051.23
You Save: $657.73 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Position: Rear
- Replaced by: 41110-3D022
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2002 Toyota 4Runner | LULI, SR5B, SR5V | 4 Cyl 2.7L, 6 Cyl 3.4L | 3RZFE, 5VZFE; 3RZFE, 5VZFE; RZN180L-GKPSKA, VZN185L-GKPGKA, VZN185L-GKPSKA, VZN185L-GKPZKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-3D480
$1806.75 MSRP: $2659.52
You Save: $852.77 (33%)
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Manufacturer Note: *FGR=43:11=3.909
- Position: Rear
- Replaced by: 41110-3D481
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2005 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN210L-GKAGKA, GRN210L-GKAZKA, GRN210L-GKPGKA, GRN210L-GKPZKA
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-3D560
$1740.98 MSRP: $2562.72
You Save: $821.74 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Manufacturer Note: *FGR=43:11=3.909
- Position: Rear
- Replaced by: 41110-3D562
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2003-2005 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN215L-GKAGKA, GRN215L-GKAZKA, GRN215L-GKPGKA, GRN215L-GKPZKA
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Toyota 4Runner Front Differential Carrier Assembly
Part Number: 41110-35370
$2046.16 MSRP: $3011.94
You Save: $965.78 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assy, Differential, Front
- Manufacturer Note: *FGR=41:9=4.555
- Position: Front
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1989-1995 Toyota 4Runner | DLX, SR5 | 4 Cyl 2.4L, 6 Cyl 3.0L | 22RE, 3VZE; 22RE, 3VZE; RN101L-TRPDEA, RN101L-TRPDEAB, RN106L-TRPDEA, RN106L-TRPDEA3, RN106L-TRPDEK, RN110L-CRPDEA, RN110L-CRPDEA3, RN110L-CRPSEA, RN110L-CRPSEA3, RN130L-GJPSEA, RN130L-GKPSEA, RN131L-RJPSEK, RN131L-RKPSEK, VZN100L-TRMDEA, VZN100L-TRMDEA3, VZN100L-TRMDEAB, VZN100L-TRMDEK, VZN105L-TRMDEA, VZN105L-TRMDEA3, VZN105L-TRMDEK, VZN105L-TRPDEA, VZN105L-TRPDEA3, VZN110L-CRMDEA, VZN110L-CRMDEA3, VZN110L-CRMDEAB, VZN110L-CRMDEK, VZN110L-CRPDEA, VZN110L-CRPDEA3, VZN110L-CRPDEAB, VZN110L-CRPDEK
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Toyota 4Runner Rear Differential Carrier Assembly
Part Number: 41110-3D010
$2416.49 MSRP: $3557.07
You Save: $1140.58 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Carrier Assy, Differential, Rear
- Manufacturer Note: *FGR=41:9=4.555,W(REAR DIFFERENTIAL LOCK)
- Position: Rear
- Replaced by: 41110-3D011
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2001 Toyota 4Runner | SR5B | 4 Cyl 2.7L | 3RZFE; 3RZFE; RZN185L-GKMSKA, RZN185L-GKPSKA
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Toyota 4Runner Front Differential Carrier Assembly
Part Number: 41110-35A90
$1735.92 MSRP: $2555.26
You Save: $819.34 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Carrier Assembly, Differential, Front
- Position: Front
- Replaced by: 41110-35A92
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2012-2016 Toyota 4Runner | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN285L-GKAGKA
- 2004-2008 Toyota 4Runner | Limited, SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN215L-GKAGKA, GRN215L-GKAZKA, GRN215L-GKPGKA, GRN215L-GKPZKA
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Toyota 4Runner Carrier Sub-Assy, Differential W/Pin, Rear
Part Number: 41102-35010
$510.29 MSRP: $751.14
You Save: $240.85 (33%)
Product Specifications
- Position: Rear
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2008-2009 Toyota 4Runner | SR5 | 6 Cyl 4.0L | 1GRFE; 1GRFE; GRN215L-GKAGKA

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Toyota 4Runner Differential

The Toyota 4Runner Differential is a special mechanism in the car's transmission system, which lets the vehicle wheels turn at different speeds depending on the corner in order to continue to remain in contact with the ground and provide adequate grip with the ground at all times. Various types of differentials including bevel, spur, and epicyclic differentials have been used in the 4Runner vehicles with features that include torque splitting, compactness among others. Open differentials are commonly used, they however, can result in poor tractions on slippery surfaces because of almost equal splitting of torque. The 4Runner has active and limited-slip differentials for better torque delivery on the road and active ones may be used for tuning/ drifting. In conclusion, Toyota 4Runner Differential is very significant in the improvement of vehicle performance and handling capacity.

If you are in demand for superior quality and affordable OEM Toyota 4Runner Differential, then shop with us! We own a wide range of the reduced-priced genuine Toyota 4Runner Differential. You can purchase in confidence as all parts come with a manufacturer's warranty. Any issues with our products? No need to worry as we have a hassle-free return policy to guide you every step of the way.

Toyota 4Runner Differential Parts Questions & Experts Answers

Rear Differential Carrier Assembly
41110-35C60
Q: What is the Automatic Disconnecting Differential (ADD) for 4WD models and how is it removed and installed on 2003 through 2009 Toyota 4Runner?
A: The Automatic Disconnecting Differential (ADD) system is responsible for connecting the power flow through the left Axle Shaft in 4WD mode and disconnecting it in 2WD mode. While ADD offers convenience in selecting 2WD or 4WD without dealing with locking hubs, it increases wear on CV joints, CV Boot, and certain axle and differential components that rotate even in 2WD. Regular inspection of CV joints and boots is recommended for ADD-equipped vehicles. If issues arise during shifting into or out of 4WD, it's advisable to have the ADD system checked by a qualified repair shop or dealer service department specializing in 4WD vehicles. For differential carrier removal, begin by loosening the wheel lug nuts, and raising and securely supporting the vehicle on jack stands. Remove engine splash shields, and driveaxles, and drain the lubricant from the differential. Disconnect the driveshaft from the front differential and support the front end with wire. Proceed to remove the front stabilizer bar, brackets, front wheel speed sensors, and front tie rod ends, and separate the lower control arms from the steering knuckles. Disconnect the breather tube bracket, detach the fasteners retaining the vacuum tubing bracket, unplug the actuator electrical connector, and detach the actuator vacuum hoses. Remove the tube and wire harness assembly from the differential. Support the differential with a transmission jack or floor jack, remove the differential rear mounting nut and the two front mounting bolts/nuts, and lower the differential. For installation, follow the reverse order of removal. Refill the differential with the appropriate lubricant and tighten the lug nuts to the specified torque. To remove the ADD actuator, raise the vehicle and support it securely on jack stands. Remove the splash shields and the four retaining bolts. Take out the actuator. Before installing the actuator, clean off the old RTV sealant from the mating surfaces of the differential and the actuator, and apply a thin bead of new RTV sealant to those surfaces. During installation, tighten the bolts according to specifications, and reverse the steps of removal.