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Fully Built 3rd Member

Manufacturer: Trail Gear

Assembled 3rd Members

All new parts, no used housings or internal parts. Ready to drop into your axle. Third members feature top quality ring & pinion gears and lockers. V6 units feature larger OEM style V6 gear sets with longer pinion gear. Each unit is setup with solid pinion spacers for long gear life.  Triple drilled flanges included covers common driveshaft patterns.

Now available with Yukon Grizzly and Zip Lockers!

High Pinion4.88 140038-1-KIT140044-1-KIT301559-1-KIT301565-1-KIT
High Pinion5.29 140039-1-KIT140045-1-KIT301560-1-KIT301566-1-KIT


Application Notes: High Pinion units should only be used in front axle applications. Use in the rear axle will lead to ring and pinion failure. Spool lockers should only be used in rear applications.  Spools will be harder on axles then a selectable or automatic locker.  Fully built 3rd members will not fit stock Tacoma or T100 axles.


All new 3rd members require a break-in period to prevent damage from overheating. Any overloading or over-heating during this periods can cause the gear oil to break down resulting in ring and pinion failure.

  • After installation, drive litghtly for 20-30 minutes and then allow the diff to cool for at least two hours.
  • Avoid heavy throttle use during the first 500 miles.
  • Do not tow a trailer during the first 500 miles.
  • Change oil after 500 miles to remove any particles suspended in the oil.

This may seem unnecessary but it is very easy to damage the differential by loading it before the gear set is completely run in. New ring & pinion gears create excess heat when they are new. This excess heat can damage the heat treatment of the gears.


  • All new parts, no used housings or internal parts
  • V6 units feature larger OEM style V6 gear sets with longer pinion gear

Application Data

  • 1979-1995 Toyota Pickup (All Engines)
  • 1985-1995 Toyota 4Runner (All Engines)

Note:  Fully built 3rd members will not fit stock Tacoma or T100 axles.

TG301555-1-KIT 301555-1-KITTG301561-1-KIT 301561-1-KITTG140040-1-KIT 140040-1-KITTG140034-1-KIT 140034-1-KITTG140066-1-KIT 140066-1-KITTG140044-1-KIT 140044-1-KITTG140038-1-KIT 140038-1-KITTG301559-1-KIT 301559-1-KITTG301565-1-KIT 301565-1-KITTG140240-1-KIT 140240-1-KITTG140036-1-KIT 140036-1-KITTG140068-1-KIT 140068-1-KITTG301557-1-KIT 301557-1-KITTG301563-1-KIT 301563-1-KITTG301556-1-KIT 301556-1-KITTG301562-1-KIT 301562-1-KITTG140041-1-KIT 140041-1-KITTG140035-1-KIT 140035-1-KITTG140067-1-KIT 140067-1-KITTG140045-1-KIT 140045-1-KITTG140039-1-KIT 140039-1-KITTG301560-1-KIT 301560-1-KITTG301566-1-KIT 301566-1-KITTG140043-1-KIT 140043-1-KITTG140069-1-KIT 140069-1-KITTG140037-1-KIT 140037-1-KITTG301558-1-KIT 301558-1-KITTG301564-1-KIT 301564-1-KIT
Picture of 4.88 V6 Detroit
4.88 V6 Detroit
SKU: TG140036-1-KIT
Manufacturer part number: 140036-1-KIT
Picture of 5.29 V6  Detroit
5.29 V6  Detroit
SKU: TG140037-1-KIT
Manufacturer part number: 140037-1-KIT
Picture of 4.88 4Cyl Detroit
4.88 4Cyl Detroit
SKU: TG140034-1-KIT
Manufacturer part number: 140034-1-KIT
Picture of 4.88 V6, Grizzly
4.88 V6, Grizzly
SKU: TG301557-1-KIT
Manufacturer part number: 301557-1-KIT
Picture of 4.88 V6, Zip Air Locker
4.88 V6, Zip Air Locker
SKU: TG301563-1-KIT
Manufacturer part number: 301563-1-KIT
Picture of 5.29 4Cyl Spool
5.29 4Cyl Spool
SKU: TG140067-1-KIT
Manufacturer part number: 140067-1-KIT
Picture of 5.29 Hip, Grizzly
5.29 Hip, Grizzly
SKU: TG301560-1-KIT
Manufacturer part number: 301560-1-KIT
Picture of 4.88 Hip Detroit
4.88 Hip Detroit
SKU: TG140038-1-KIT
Manufacturer part number: 140038-1-KIT
Picture of 4.88 Hip, Grizzly
4.88 Hip, Grizzly
SKU: TG301559-1-KIT
Manufacturer part number: 301559-1-KIT
Picture of 5.29 V6 Arb
5.29 V6 Arb
SKU: TG140043-1-KIT
Manufacturer part number: 140043-1-KIT
Picture of 4.88 4Cyl Arb
4.88 4Cyl Arb
SKU: TG140040-1-KIT
Manufacturer part number: 140040-1-KIT
Picture of 5.29 V6, Grizzly
5.29 V6, Grizzly
SKU: TG301558-1-KIT
Manufacturer part number: 301558-1-KIT
Picture of 4.88 V6 Spool
4.88 V6 Spool
SKU: TG140068-1-KIT
Manufacturer part number: 140068-1-KIT
Picture of 5.29 4Cyl Detroit
5.29 4Cyl Detroit
SKU: TG140035-1-KIT
Manufacturer part number: 140035-1-KIT
Picture of 4.88 Hip Arb
4.88 Hip Arb
SKU: TG140044-1-KIT
Manufacturer part number: 140044-1-KIT
Picture of 5.29 4 Cyl, Zip Air Locker
5.29 4 Cyl, Zip Air Locker
SKU: TG301562-1-KIT
Manufacturer part number: 301562-1-KIT
Picture of 5.29 4Cyl Arb
5.29 4Cyl Arb
SKU: TG140041-1-KIT
Manufacturer part number: 140041-1-KIT
Picture of 5.29 Hip Arb
5.29 Hip Arb
SKU: TG140045-1-KIT
Manufacturer part number: 140045-1-KIT
Picture of 5.29 4 Cyl, Grizzly
5.29 4 Cyl, Grizzly
SKU: TG301556-1-KIT
Manufacturer part number: 301556-1-KIT
Picture of 5.29 Hip Detroit
5.29 Hip Detroit
SKU: TG140039-1-KIT
Manufacturer part number: 140039-1-KIT
Picture of 5.29 V6 Spool
5.29 V6 Spool
SKU: TG140069-1-KIT
Manufacturer part number: 140069-1-KIT
Picture of 4.88 4 Cyl, Zip Air Locker
4.88 4 Cyl, Zip Air Locker
SKU: TG301561-1-KIT
Manufacturer part number: 301561-1-KIT
Picture of 4.88 V6 Arb
4.88 V6 Arb
SKU: TG140240-1-KIT
Manufacturer part number: 140240-1-KIT
Picture of 5.29 V6, Zip Air Locker
5.29 V6, Zip Air Locker
SKU: TG301564-1-KIT
Manufacturer part number: 301564-1-KIT
Picture of 4.88 4Cyl Spool
4.88 4Cyl Spool
SKU: TG140066-1-KIT
Manufacturer part number: 140066-1-KIT
Picture of 4.88 4 Cyl, Grizzly
4.88 4 Cyl, Grizzly
SKU: TG301555-1-KIT
Manufacturer part number: 301555-1-KIT
Picture of 4.88 Hip, Zip Air Locker
4.88 Hip, Zip Air Locker
SKU: TG301565-1-KIT
Manufacturer part number: 301565-1-KIT
Picture of 5.29 Hip, Zip Air Locker
5.29 Hip, Zip Air Locker
SKU: TG301566-1-KIT
Manufacturer part number: 301566-1-KIT