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Old 08-07-2003, 02:00 AM
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400ci.

i have a 78' chevy shortbed . curious on who thinks i can safely put a stock 700-r4 behind a pretty stout 406.

10.0:1, 800 mighty demon,rpm air-gap,230 @ 50 duration cam,220cc pro-1 heads,roller rockers,petronix stick & box,7-quart pan w/windage.

rear is stock/not sure on ratio but will replace with 3:73.

will i kill the stock 700r4 tranny. i also own a 350 and 400 tranny.

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Last edited by jonathan stout; 08-07-2003 at 02:18 AM.
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Old 08-07-2003, 04:36 AM
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the 700 will never hold up behind that much torque. the weak link in these tranny`s is the sun gear as well as other things, in fact, the pre 88 models aren`t wanted due to they had many more problems than the later models. a turbo 350`s weak link is the sprag, the 400`s, same thing. but I`ve seen them survive as long as there not abused, such as dry hopping it and improper burnout. heavy duty parts are avalible for the 700, 350 and 400, but there expensive. I think the 400 will work fine in your case.
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Old 08-07-2003, 06:47 AM
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If you want an overdrive consider the TH200R4. They can handle more power than the 700R4.
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Old 08-07-2003, 09:21 AM
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I think the 700 would hold up. I have a friend that built a big block monte ss and it runs 12 second quarters(heavy car lifts the front when it launches) His 700 is holding up. (Of course we are good friends with a tranny guy that is a genius when it comes to the 700.) Another thing is he drives it 150 miles to the track, he puts his slicks on and runs it. He then puts the street tires on and drives it back home. He has a lockup converter and gets 18 mpg on his trip. There is a place called the converter shop in lake havasu arizona that makes lockup converters that can handle full throttle. ( thats what they claim) they also have a place in california. Since you have the tranny find ya a guy to put in the good parts and get a good converter.

good luck
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Old 08-07-2003, 07:10 PM
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the 700r4 would hold up fine if properally built but the 350 or 400 would also work fine and be much cheaper to built of cource you would be sacraficing some fuel economy. I believe a 400 would be over kill though since they are fairly ineffecent due to the mass of the internals and why move more wieght than you have to

one other thing it is generally exepted that the 700 is stronger than the 200r4 although both can be built to take alot of power
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