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73-87 Chevy _ GMC Trucks => Performance => Topic started by: lpapa15 on August 14, 2010, 12:41:57 am
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Can someone tell me what transmission I should convert to for my 1979 chevy 350 4x4? I want to go automatic. Right now it is a manual 3 speed.
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350, 400, or 700r4
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whats your plans ? mud, lift or just street
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4 inch lift, street, and a little off road.
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4 inch lift, street, and a little off road.
400 is strongest, but non-OD and has a (2.48) 1st gear ratio.
350 is just a light duty 3 speed, but doesn't sap as much engine power as a 400 does and has a (2.52) 1st gear ratio.
700R4 is OD, and has a lower 1st gear (3.06)-(better torque multiplication) saps less power then a 400, but for it to be strong enough, no STOCK version will do for what you want. have a mildly built one made for you and it'll work well. they're not much more expensive than a stock rebuild.
Though any of them can be built plenty strong, I'd probably go with a 350 or 700. depends on if you want or need OD. I like OD myself.
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No brainer. A properly rebuilt 700R4 with Transgo reprogram kit.
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iv always heard that bigger tires will kill an od trans fast so maybe with the mods done to it it could i guess hold up
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700R4
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4L80E best option, 4L60 (700R4) second best option, 400 (3L80) thrid best option
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700R4's are garbage, I had one bolted to a 305 and that thing exploded. Get a th350. Personally I went with a built th400 but they do take a lot of power up.
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who built your 700r4? What do you mean exploded? Was it setup properly? I agree, a poorly built, improperly setup 700r4 is a time bomb, but they can take many a mile in a lot of vehicles.
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Stock, early 700r4 are weaker than later years. But they can be built tough, especially for your application. What is your price range?