Transmission Help

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Transmission Help

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Chevrolet Forums >> Chevy Trucks, Vans & SUV's >> Silverado >> Transmission Help

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Transmission Help - 8/24/2007 9:12:32 AM

An89Chevy

Posts: 72
Joined: 5/11/2007
Status: offline

My 350 crate engine has shredder ""two"" 700r4's in the past 3 months. so a friend directed me to get a th350 because they hold up better. my engine produces about 260 HP and about 350 Ft lbs of torque. its a stock engine with a few minor upgrades. Where do you guys recommend i get the transmission from. I'm on a tight budget too. but I'm gonna need everything to swap from a 700r4 to a th350. I'm going to go with a floor shift, and i heard that that the vacuum modulators are the way to go over the detent cable. What stall speed converted should i use. stock? should it match the cam? Do i need to get a new Drive shaft? what about making my Speedometer work, should i just get a mechanical gauge and replace it? also What does the computer run besides the old fuel injection? before i did the engine swap.

Thanks for any input
Phil

1989 Chevy c1500 Short bed Reg cab.
350 Small block (GM crate engine)
Hydraulic flat tappet cam, (.383''/.401'') and a 112� lobe separation
edelbrock 600 cfm Preformer Carb + intake
Pace setter headers
Flowmaster Super 40"s

Post #: 1

RE: Transmission Help - 8/24/2007 1:34:28 PM

kcb37

Posts: 504
Joined: 7/3/2006
Status: offline

How old were the first two trannies? That may be part of your problem. You may want to look at getting a rebuilt tranny that has stronger parts in it. If you do that a 700R4 should do just fine and you will keep your overdrive. Also how do you drive? If you punch it a lot it isn't good for them and that will tear up a tranny where as you could baby it and it will last for a long time. I think I would go with more of a race built tranny.

(in reply to An89Chevy)

Post #: 2

RE: Transmission Help - 8/25/2007 4:58:45 AM

An89Chevy

Posts: 72
Joined: 5/11/2007
Status: offline

the second tranny was a monster heavy duty 700r4 rebuild from eatmyshift.com.. i admitt i can be a little heavy on the gas sometimes, but what the fun of havin a 350 in a shortbed and have to baby the gas pedel all the time. overdrive really isent a big concern for me, i ussily drove my 700r4 in the D position most of the time and never used the overdrive, i never travel on the intrestate. most of my driving is localy. another thing i dont like is lockup.

(in reply to kcb37)

Post #: 3

RE: Transmission Help - 8/28/2007 2:16:51 PM

hntfshak

Posts: 8
Joined: 8/28/2007
Status: offline

The transmissions have a different overall length, so a new drive shaft is a must. The crossmember will have to be repositioned. Speedo cable should hook up as well as shift linkage. If the 700R4 TV cable is not set up right upon install it can screw up the transmission. That is about all I know on the swap matter. I do know that 700R4, and even the 200R4 can handle some pretty serious abuse if built by the right people. I know of a 200R4 in a full body '84 Monte Carlo with a 454 (est 450hp) and posi 4 series gears that lasted two seasons at the drags strip before 2nd gear went out. Good luck.

(in reply to An89Chevy)

Post #: 4