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DISCLAIMER Marlin Crawler FAQ


Dual Transfer Cases   "How Slow can you go"'

From 1979 to 1995, Toyota designed the mini-trucks with a very dependable gear driven transfer case.
This transfer case, model RF1A (pictured) featured a four piece design. It is this design which separates Toyota's transfer case from the rest.
With strong front output gears and an available unbreakable 23-spline input, like Toyota, Marlin Crawler knew for sure that this was the transfer case of choice. And since the case is uniquely comprised of four pieces, we are easily able to obtain a lower crawl ratio.

The first piece (between the red lines) is the reduction housing. This is where the factory reduction gears are found. When searching for your donor transfer the following information should give you an idea of what to look for.


How to identify a chain or gear driven transfer case
All V6 Hiluxes use the chain drive tcase and have a 2.57 low range gear.
Most 4 Cylinder Hiluxes use a gear drive t/case with a 2.28 low range. However some 4 cyl trucks use the V6 style chain drive case.
The best way to find out what type you have is to look under your truck and count the bolts holding the rear cover in place.

If you have 7 bolts in the rear kidney shape cover then you have the gear driven unit.

* Bolt 7 is behind the drive shaft and can't be seen in this picture.

If you have 5 bolts holding the rear round cover then you have the chain drive unit.

* Bolt 5 is behind the drive shaft and can't be seen in this picture.


Ok now you know how to identify chain and gear driven transfer cases. Next is identifying the difference between top shifting and forward shifting.


How to identify Forward Shifting and Top Shifting transfer cases
Forward Shifting
Top Shifting

The easy way to tell the difference is 4 speed = top shifting, 5 speed = forward shifting. When Toyota changed to the 5 speed gearbox the extension housing was longer than the 4 speed, this resulted in the need to have 2 shift rails that protruded from the front of the transfer case into the gearbox.

If you have a 5 speed gearbox you "should" have the 4x4 lever coming out of the gearbox not the transfer case.

No matter what you have now as long as it is gear driven you need a top shifting transfer to be the donor box. if you cannot locate a top shifting TC you can still buy and convert a forward shifting TC to top shifting.

 
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