Alright, my friends 700r4 has about had it. It's got about 125,000 miles on it now and its starting to show. He pretty much has his mind set on a new th350 w/ shift kit. My question is...If a shop installs it, will they run into any problems (ie. will the mounts need to be moved/ new mounts bought?) or anything that my friend needs to buy so the tranny will bolt right up?



Thanks guys/gals.

 

i know my local speed shop sells a th350 swap kit for our cars. not exactly sure what it contains of, maybe it relocates the trans mount or cross member??

 

It requires a different crossmember and driveshaft, although I can't remember if the TH350 is shorter or longer than the700-R4.

 

im pretty sure that the th350 is shorter than a 700r4

 

b/m30299 is the 700r4 to th350 conversion kit.

http://store.summitracing.com/partde...rt=BMM%2D30299

you will need a th350 with the 9" tailshaft. of would need to get a driveshaft about 3" longer. or can get a driveshaft out of an 82 camaro with the th200 in it.

 

I've gone through 2 700-R4's in my 86 Z-28. In both trans. 2nd and 4th gear were stripped so I bought a B&M 350 turbo with heavy duty gears and a stage 2 B&M shift kit from Summit ($950). I had to get the changeover kit (summit) and have my driveshaft extended 2 1/2 inches. It working great for me. The only things you have to deal with is:

1) rear end issues, I wind out at 110mph vs. 140+ with the 700-R4. I'm changing from 2:73 to 3:73

2) crossmember and bushings. My shift kit kicks so hard that it shakes all my crossmember bolts and bushings loose. Anything past 3000rpm in first will have me sideways when I hit second!!

You have to understand that with the stock rear your gonna have a quarter car ,but it's sooooo worth it until you get at least 3:73 or better.

 

Dude I hate to break it to ya but going from 2.73's to 3.73's is goint to take a substantial amount OFF your top speed, not add to it. If 2.73's makes it a quarter car, then 3.73's will turn it into an eighth-mile car. You're gonna top out at like 90.

 

why did changing transmissions drop your top speed so much? I know it doesn't have overdrive, but my overdrive doesn't pull much anyway. And 3.37's are going to kill top speed even worse.