Thread: any insite on the 700R4??

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ok i am wanting to know if the 700r4 tranny is any good with lock in converter and all

and what are the limets to these trannys????

You can get a 700/R4 that will stand up under 450 HP for a little over $1000, and up to 630 hp for about $1300. A matching converter goes for $270 - $570.

In a 700/R4, you NEED, I repeate REALLY NEED to use a locking converter. If you drive it on the street without a 4th gear lockup, you will burn it up in short order. All the trans suppliers have wiring kits.

Homework assignment:

Read a bunch of stuff at http://www.bowtieoverdrives.com

ok but i found one in a old buik and it is pretty cheap would it do the same as the one for $1000 it has a lock in converter and all???

NO. You can't compare a "cheapie" out of an old Buick to a new, rebuilt transmission. If you could, it would cost #1000 too. The $1000 unit I priced was rebuilt for up to 450 HP. I have a 700-R4 in my '93 Vette, which was rated at 300HP, and it's lasted 110,000 miles.

You can get lockup wiring for it. Also, the TV cable and linkage is very important. Improper TV adjustment will kill a 700-R4 in short order.

They're very reliable, solid transmissions if installed correctly, and have proper cooling.

yeah well would it hurt to do a burn out in one of these trans after it locks it is kind of like a straight sift right or wrong until you hit the brakes???

Originally posted by TRUCKGUY
yeah well would it hurt to do a burn out in one of these trans after it locks it is kind of like a straight sift right or wrong until you hit the brakes???

No, hard acceleration won't hurt it - but there's a limit to hard driving. You find the limit when the parts break.

A locking converter does just that. It locks the engine to the transmission, eliminating the slip in the converter.

Most kits have a disconnect switch in the brake lines. When you hit the brakes, the converter unlocks.

yeah thats how i was thinking it would work would it be a good trans to put in my 72 pickup????

The Buick 700R-4 will most likely have the BOP (Buick, Olds, Pontiac) bolt patern. If it does you will need an adapter to put it behind a Chevymotor.

A used automatic transmission and converter out of a RUNNING doner car can be a good deal. Same out of a wrecked vehicle. But a transmission out of a yard with no history is a core - just a place to start rebuilding.

it is running and i was wanting to buy the whole car it has the 305 in it and i figured it would be good till i got a better one for it kinda temporaty i suppose.

Thank's

well from what i read on the site you gave me i think i will just try to find me a m22 muncie it would be cheaper and i can use it for daily use and dont need all the other stuff to go with it.

thank's anyway's

An M20 with a 2.54 low gear would give better off-the line, and they put them in high horsepower Chevelles, GTOs and 442s.

The rock crusher M22 has a 220 low, and is much harder to find.

well then i guess i will go with the m20 wich ever i can find as long as its a muncie i heard alot of good things about them

How about a muncie sm420 " granny tranny ", there geared very low but with the right diff ratio, it woulden't be too owfel bad, they were designed for those old trucks also.

never heard of it but if it was designed for trucks it probly would be geared low and not be good for racing would it???

i have a 4 speed truck tranny

I got a 700r4 in my 82 Silverado, with the mild build & it handled my 383 stroker with a 292 cam for 135,000 miles before it started to slip & I give 'er what for ALL the time. The 700r4 is the closest to the M22 in gear ratio, and is also great for crusin.....