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Old 10-02-2003, 01:41 PM
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turbo 400 vs 700R4

I am currently driving an 86 chevy 4x4 with a 700r4. I rebuilt the engine and took out the computer. I have now lost 3rd gear in the tranny. I want to replace 700 with a 400. What kind of modifiactions do I need to do for this swap to work? Or will the 400 bolt to the transfer case?

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Old 10-03-2003, 12:27 AM
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I"d keep the 700
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Old 10-03-2003, 12:39 AM
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If I recall correctly, the 4X4`s recieved tranny`s with special output shafts, you`d have to find a turbo 400 made for this purpose. I`d advise also to keep the 700, it`s lower first gear is of benefit in a 4X4, when you removed the computer, did you keep the lockup converter function via wireing kit? if not, the tranny likely cooked itself. if you didn`t add a external trans cooler this is what likely caused the tranny to go south. get the trans rebuilt, get a painless wiring kit to get the lockup converter in use and get a external trans cooler. the number 1 cause of auto tranny failure is heat, and without the lock up function the trans gets hot in a hurry and the seals and clutches cook. the stock radiator cooler won`t cut it, after time they get half clogged with clutch particles as well as other trash and the tranny runs even hotter. pull the dipstick and inspect the fluid, if it`s black and smells burned, you found the cause.
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Old 10-03-2003, 06:28 PM
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If you have the stock transfer case it is a 208. The input on a 208 for a 700 and for a 400 are different and the adapters are different. The same driveshafts will work. I have done the swap and got a 400 with the proper 208 and adapter on it. You will need a vacuum line and a kick down switch.
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