If you have a 4-cylinder 1979-1995 Toyota Pickup or a 4 cylinder 1985-1995 4Runner, as long as the truck didn’t have Automatic Differential Disconnect (ADD), the stock transfer case in the vehicle was a gear-driven RF1A with a 2.28:1 low range gear ratio.

It doesn’t take long to realize that a 2.28:1 low range is too high for some terrain.  More than twice the torque at half the speed can be achieved with 4.7:1 gear set in your transfer case.

While you could remove your T-case, drag it to the workbench and replace the 2.28 gears with 4.7 gears yourself,  spend more time on the trail by simply replacing your stock RF1A with our fully-built Trail-Creeper™ 4.7 Transfer Case.

Additionally, as shown in the Transmission Matrix below, our Trail-Creeper™ 4.7 Single Transfer Case can replace the VF1A chain-drive transfer case in a V6 Pickup or 4Runner when installed with the V6 Adapter Kit (SKU: 100086-1-KIT).

We manufacture 12 different variations of this transfer case.  Choosing the right variation for your application requires defining the following three options:

Input Gear:  [21-Spline or 23-Spline]

Shifter Options:  [Top Shift,  Foward Shift 4″ Offset or Forward Shift 4.5″ Offset] – Top shift T-cases have the shifter(s) on top of the transfer case. Forward Shift T-cases have protruding shift forks that attach to shifter(s) mounted on the transmission.

Single or Twin Stick:  [Single Stick Only or Twin Stick Ready (Loose Interlock Pin)] – A twin-stick allows independent control of low/high range and 2WD/4WD engagement.  With a twin-stick configuration you can switch between 2WD and 4WD without stopping and access 2WD Low-Range for better handling when traveling between obstacles on a trail.

The transmission matrix below will assist you in determining which input gear and shifter options are compatible with your transmission.  It is up to you whether you opt for a single or twin-stick configuration to control your transfer case (as long as you don’t have a W56-C, D or E transmission that REQUIRES Single Stick).

79-83 L43/L45/L50/L52 21-Spline Top Shift
8/83-88 G52/G54 21-Spline Forward Shift-4.5″ Offset
85-88 W56A/B 21-Spline Top Shift
86-87 R151F 23-Spline Forward Shift-4.5″ Offset Bench Seat Models
86-87 R151F 23-Spline Top Shift Bucket Seat Models
88-95 R150F 23-Spline Top Shift This transmission was originally sandwiched between a 3VZ-E V6 engine and a VF1A chain-drive transfer case. Replacing this transfer case with a Trail-Creeper™ 4.7 Single Transfer Case requires our V6 adapter kit (SKU: 100086-1-KIT)
89-95 W56-C/D/E 21-Spline Forward Shift-4″ Offset Single Stick ONLY!



If your adventures lead you to places where even a 4.7:1 transfer case gear ratio is insufficient, you can combine this case with our Trail-Creeper™ 2.28 Crawl Box to create a dual transfer case.

Please NOTE:

  • Our Trail-Safe™ T-case Output Seal will be included and installed at no additional cost.
  • If you are unsure if you have the 4″ or 4.5″ Forward Shift transfer case, please refer to the comparison image at the top of the page.
  • While these transfer cases ship with a new shifter base, neither the [Single Stick Only] cases nor the [Twin Stick Ready] cases ship with shifters.  Shifters must be purchased separately if needed (see “Related Products” below).

Additional information

Weight 75 lbs
Dimensions 19 × 13 × 13 in
Input Gear

21-Spline, 23-Spline

Shifter Options

Top Shift, Forward Shift 4" Offset, Foward Shift 4.5" Offset

Single Or Twin Stick

Single Stick Only, Twin Stick Ready (loose Interlock Pin)