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Toyota Transmission Tech Info
4 Cyl Transmissions
W56 - Came behind fuel injected 22RE from 1985-1995
L and G series transmissions share the same bellhousing-to-engine bolt pattern as the W56, but the bellhousings do not interchange between each other. L & G are considered significantly weaker. The G52 and Jeep AX5 are essentially the same transmission, which is why I do not make parts for the AX5.
W59 is really just a mildly updated W56. In terms of strength, the W56 and W59 are nowhere near the R150. This is why many 2RZ/3RZ owners upgrade to the R150.
V6 Transmissions
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Swapping Info
The R150 is 5/8" shorter than the W56. If you adapt the R150 to the RF1A, that setup is only 1/16" shorter than the W56. In other words - if you do an R150 conversion and retain your RF1A, you don't have to mess with crossmembers or driveshafts.
Since the V6 is only "3 cylinders long", it is shorter than the 4 cyl's. This, plus the fact the R150 is shorter, meant the R150 got mounted further forward, and as a result, the R150 crossmember mounts the tcase further forward. Crossmembers are interchangeable, so you can use an R150 crossmember on a W56 setup. They also swap between frames. You can use this to your advantage in certain scenarios. For instance, if you convert a W56 truck to R150/RF1A, you can simply retain the W56 crossmember and not have to modify anything.
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