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GM 4l65E transmission to Toyota transfercase

Old 04-16-2019, 11:32 AM
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GM 4l65E transmission to Toyota transfercase

Hey everyone quick question, will this adapter work to link a 4L65E trans to my t-case? I have a 86 pickup 22re auto, I believe the Existing trans is a A340H cant find much info on how To identified the transfer case that I have
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Old 04-16-2019, 11:38 AM
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Sorry Everyone I already have a related post on this Subject, trying to Move this into my other thread
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Old 04-16-2019, 11:56 AM
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It is just about a certainty that this adaptor is to mate a Toyota RF1-A case to GM 4L60E.

The T'case on your auto tranny is specific to it , far as I know.

I might be wrong, but I very seriously doubt that any adaptors exist to mate Toyota cases from Toyota automatic trannys to anything else. People just don't use those.

Last edited by millball; 04-16-2019 at 11:59 AM.
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Old 04-16-2019, 12:31 PM
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Originally Posted by millball View Post
It is just about a certainty that this adaptor is to mate a Toyota RF1-A case to GM 4L60E.

The T'case on your auto tranny is specific to it , far as I know.

I might be wrong, but I very seriously doubt that any adaptors exist to mate Toyota cases from Toyota automatic trannys to anything else. People just don't use those.
ok so if I want to Convert over to RF1-A case Besides custom driveshafts what other mods would I be looking at to get that to work with my truck and this trans?
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Old 04-16-2019, 12:55 PM
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That adaptor, an RF1-A case, custom driveshafts, and crossmember mods.
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Old 04-16-2019, 04:16 PM
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Alright so before I buy this T-case I need to be 100% sure it's an RF1-A so I'm asking you expert's, I know it says it is but things on the internet can be "miss marked" sometimes... thanks for the help
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Old 04-16-2019, 04:21 PM
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That looks like an RF1-A case, but it is a Forward shift case. You need a top shift case.

Shift rails and stuff can be got to change a forward shift case to a top shift case, but it's easer to just find a top shift case.
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Old 04-16-2019, 04:28 PM
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Originally Posted by millball View Post
That looks like an RF1-A case, but it is a Forward shift case. You need a top shift case.

Shift rails and stuff can be got to change a forward shift case to a top shift case, but it's easer to just find a top shift case.
good to know! I appreciate the help, whats the difficulty level to convert this to the top shift? I cant find one online and would like to get my build going
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Old 04-16-2019, 04:36 PM
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The case has to be mostly disassembled to change the shift rails.

I think Low Range Offroad sells conversion kits, there are likely others who do.

Not too big a deal if you were gonna put some 4.7 crawler gears too.
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Old 04-19-2019, 03:34 PM
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Alright here's my other question, will a RF1-A hold up to a 350hp V8?
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Old 04-21-2019, 03:33 PM
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Given that the RF1A was originally designed to operate behind the 120hp 22-re, I would say probably not in it's stock configuration. It's a strong case, but 3x the power is a lot of added stress. For sure you'll want to upgrade the input shaft from 21 spline to 23 spline. Marlin Crawler can help you with that. There are other parts you can get from them to strengthen things as well. Of course, at that point you've moved the problem to the differentials and axles, which also were never designed for that kind of power.

It will also depend on your tire size and driving style.
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