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700r4

tranny upgrade

700r4

Postby jd99silverado [OP] » Dec 01 2012, 5:12am

I have a 99 silverado 1500 ls 5.3 vortec with the 4l60e and I know a guy that bought a truck with a rebuilt 700r4 and I've heard of people takin the same motor and connecting it with that tranny. My question is can I buy the tranny and put it in my truck and is it any better or would it just be better beefing up the tranny I got? Cause I have a friend that has a 700r4 in his car with a similar motor and I know they can with stand a pretty decent amount of hp... the truck its in is a 85-90 style half ton silverado
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Re: 700r4

Postby ASTE25 » Dec 01 2012, 10:09am

It will not work. The 700R4 is not an electronicly controlled transmission like the 4L60E is.
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Re: 700r4

Postby jd99silverado [OP] » Dec 04 2012, 12:53pm

What is the upgrade for my truck/motor the 4l80e?
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Re: 700r4

Postby 19trax95 » Dec 04 2012, 2:56pm

in my opinion the 700r4 would be kinda a step back. it would work though, i doubt the 700r4 would be as smooth as the 4l60e though. as far as and "upgrade" a 4l80e would boost the durability a bit. but im not positive if thats a direct swap or not.
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Re: 700r4

Postby Lunchmeat » Dec 04 2012, 3:10pm

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Re: 700r4

Postby LGSONE » Dec 04 2012, 3:16pm

You can do a 4L80e swap but it requires fabing up the rear support of the transmission, driveshaft work both front and back if 4x4 and then a "patch" to the computer for it to work with the 80e. You also have to rework the trans cooler lines and modify a wiring harness for everything to work. Alot of the hot rod trucks do this mod because they would destroy a 4L60e with all the power they make with turbo's and superchargers. You could beef up the 4L60e if you are not building a big power motor. I'm going to do the 4L80e swap this spring. It can be done and there are several how to's on what is required.

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