Transfer Case Bible
This is the ORIGINAL Gear Drive Transfer Case Bible created by Marlin Crawler back in the 90s. All styles are a 2-speed plus neutral design, with a 1.00:1 high range and a 2.28:1 low range. The high range is a direct-drive straight-through design which maximizes efficiency and torque handling. Because the input directly connects to the output, there is no way to alter the high range gear ratio. In neutral, the front and rear outputs are connected to one another with only the input rotating independently of both outputs. Twin Stick kits are available that allow for the input + rear output + front output to all three rotate independently of one another.
Type 1-A Carb 4Cyl
- Installed 1979 – 1980
- Top Shift
- Short Style Case
- Short Low Range Shift Rod
- C-Clip Retained 2WD/4WD Rod
- 8 or 9 mm Flange Bolts
- Noisey Style Gears
- 21 Spline “Fuseless” L43-Style Input
- 27 Spline Outputs
Type 1-B Carb 4Cyl
- Installed 1981 – 4/1983
- Top Shift
- Short Style Case
- Short Low Range Shift Rod
- C-Clip Retained 2WD/4WD Rod
- 8mm Flange Bolts
- Noisey Style Gears
- 21 Spline Input
- 27 Spline Outputs
Type 1-C Carb 4Cyl
- Installed 4/1983 – 8/1983
- Top Shift
- Tall Style Case
- Short Low Range Shift Rod
- C-Clip Retained 2WD/4WD Rod
- 8mm Flange Bolts
- Noisey Style Gears
- 21 Spline Input
- 27 Spline Outputs
Type 2-A Carb 4Cyl
- Installed 8/1983 to 4/1984
- Forward Shift, 4.5″ Offset
- Shifter Block Off Plate
- Tall Style Case
- 10mm Flange Bolts
- Quiet Run Gears
- No Bearing Retainer Clip
- 21 Spline Input
- 27 Spline Outputs
Type 2-B Carb 4Cyl
- Installed 4/1984 – 8/1988
- Forward Shift, 4.5″ offset
- Shifter Block Off Plate
- Tall Style Case
- 10mm Flange Bolts
- Quiet Run Gears
- With Bearing Retainer Clip
- 21 Spline Input
- 27 Spline Outputs
Type 3 EFI 4Cyl
- Installed 1985 – 1988 EFI Pickup
- Installed 1985 – 1989 EFI 4Runner
- Top Shift
- Tall Style Case
- Long Low Range Shift Rod
- Hook Retained 2WD/4WD Rod
- 10mm Flange Bolts
- Quiet Run Gears
- With Bearing Retainer Clip
- 21 Spline Input
- 27 Spline Outputs
Type 4 Turbo EFI 4Cyl
- Installed 1986 – 1987 22R-TE
- Tall Style Case
- 10mm Front Flange Bolts
- Quiet Run Gears
- With Bearing Retainer Clip
- Same Shift Rods as Type 2 Cases
- 23 Spline Input
- 27 Spline Outputs
Type 5 PTO EFI 4Cyl
- Unique PTO (Power Take-Off) access port on housing #1 (reduction housing)
- 4-bolt rectangular PTO mount flange
- External device powered by the Low Speed Idler Gear
- External device believed to be a Water Pump on International Toyota Fire Trucks
- Tall Style Case
- Long Low Range Shift Rod (if top shift)
- Hook Retained 2WD/4WD Rod (if top shift)
- Top or Forward Shift
- Quiet Run Gears
- 10mm Flange Bolts
- With Bearing Retainer Clip
- 21 Spline Input
- 27 Spline Outputs
Type 6-A EFI 4Cyl
- Installed 1989 – 1991 Pickup
- Installed 1990 – 1991 4Runner
- Tall Style Case
- Forward Shift, 4″ Offset
- 10mm Flange Bolts
- Quiet Run Gears
- Block Off Plate
- Mechanical Speedo Cable Drive
- 21 Spline Input
- 27 Spline Outputs
Type 6-B EFI 4Cyl
- Installed 1992 – 1995 Pickup
- Installed 1992 – 1993 4Runner
- Tall Style Case
- Forward Shift, 4″ Offset
- 10mm Flange Bolts
- Quiet Run Gears
- Block Off Plate
- No Flat Washers on Case Bolts
- Electrical Speedo Cable Drive
- 21 Spline Input
- 27 Spline Outputs
How to ID Gear Drive Case
If you have 7 bolts in the rear cover then you have the gear driven unit.
If you have 5 bolts holding the rear cover then you have the chain drive unit.
Bolt #7 is behind the drive shaft and can’t be seen in this picture.
In both photos the transmission and transfer case have been separated to show where one ends and the other starts. It also helps show the shift forks on the forward shift setup. The left photo shows a top shifting transfer case and transmission. Notice the tcase shifter comes out of the top of the tcase. The transmission has just one shifter. Notice there are no forks on the front of the tcase. The right photo is a forward shift transfer case. Notice the block off plate on top of the case. This unit is shifted through two rails that connect to the transmission. A forward shift transmission like this one has two shifters, one for the tranny and one for the tcase. Click photos for larger image.
The block off plate of a forward shift style tcase can be seen from under the vehicle. From under the truck on the driver side look up at the transfer case to see the block off plate.
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Top Shift
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Forward Shift
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Please see our Transfer Case Parts & Upgrades and our Shifter Parts page for Optional, Replacement, and Conversion Parts.