700R4 replacing 3 speed
 

Hey guys,
I am going to put a 700R4 in my 65. It currently has the 3 speed manual in it. Does anybody know off hand if it will fit under the floor ok since it doesn't have the granny tranny hump? I need to break out the tape measure and crawl around it, but it's only 4 degrees out today. Thanks.

Re: 700R4 replacing 3 speed
 

yeah it will fit. i have one in my wifes 62

Re: 700R4 replacing 3 speed
 

Yea it will fit just fine, I have the 4l60e in my 65, which is the younger sister to the 700.

Re: 700R4 replacing 3 speed
 

Hello... I was just wondering if you did this transmission swap in your 65? I would love to have any information or photos on the swap. Thank you..
Tim....

Re: 700R4 replacing 3 speed
 

my 66 had a 700r4 in it, after the 3 speed manual, but before the 4l80e haha

It will definitely fit, as the overall profile of the 700r4 isnt huge. If you haven't worked with the 700r4 before, just make sure you have the TV Bracket mounted onto your carb. Without it the trans will be useless, as the 700 relies on the TV cable for operation...without it it will melt down.

I'd also suggest a good tranny cooler if you don't have one.

Re: 700R4 replacing 3 speed
 

You will have to bed the cab lip a bit, not much maybe a 1/4 inch. The 700 will hang up on it. I think you can see the lip I am talking about in this picture. I drove this truck for 4 years with a 700R4 in it.

Re: 700R4 replacing 3 speed
 

Aside from the TV cable hookup, don't forget this trans has an electronic hookup for the torque converter lockup. You will need to address both issues to get the full benefit of the OD trans.

Re: 700R4 replacing 3 speed
 

Hey, Skysoldier, Did you get yours hammered down? Never got an update on the outcome.

Everything above is all good advice. The TV cable adjusts shift points and stiffness of shifts and the electronic part controls the torque convertor lockup. If it doesn't shift correctly or lock up (atomatically or manually), you will DESTROY that tranny. I know from experience. Very expensive lesson learned!! Now, i have a couple of these transmissions lying around for future projects. Get em cheap and rebuild them, then squirrel them away for other rides. I will never go with any other trans than a 700R4 in anything I build from now on.

Sam

Re: 700R4 replacing 3 speed
 

If you want to put serious power in front of those 700r's, your going to HAVE to keep a few around. At least you'll get good at rebuilding 'em. :)

Re: 700R4 replacing 3 speed
 

Yes, Sam. I ended up putting a manual switch on the dash for torque converter lockup, but i leave it in the "on" position pretty much all the time. I had to play with the adjustment on the tv cable a little, but got it where it needed to be finally. Works like new. If i had it to do again though, i think i would just use the vacum operated switch to operate the converter, really doesen't to seem to be any reason to manually control it when the factory switch did a good job. I've driven the truck everywhere all summer long and no problems. Just put it away for the winter last week. The old gal is resting now till spring and then it will live again.

Re: 700R4 replacing 3 speed
 

I had to do the same thing.

Re: 700R4 replacing 3 speed
 

Yes it will fit , I put a tbi 350 with 700r4 in my 66 gmc, here is what I used and it fit just fine.

1. newer style motor mounts from a 91 burb

2. Tubular crossmember

I may have used the forward holes on the motor mounts cannot remember

did not have to massage trans tunnel......Kieth


here is a link to my build and the motor mounts :

http://kieth.smugmug.com/Trucks/66-G...03189742_7VUCY


here is the trans crossmember:

http://kieth.smugmug.com/Trucks/66-G...39504536_X5Lck

Re: 700R4 replacing 3 speed
 

I had a manual switch as well, but I really don't think leaving it ON is the best idea. Deceleration etc while locked up is less than ideal.

Re: 700R4 replacing 3 speed
 

I thought that too, but i found the converter automatically disengages upon deceleration as the trans shifts down. It's got several thousand miles on it and no problems whatsoever.

Re: 700R4 replacing 3 speed
 

For $120 you can change out the electronic converter and go with a mechanical that locls up at 1100 RPM. Also get the ceramic pack 3rd and 4th gear.-Much stronger.

Re: 700R4 replacing 3 speed
 

I agree, the 700r4 is not a hot rod trans, but I'm pretty easy on it. Got a real low rear from the old granny gears (its original and had the granny geaer with the 4speed) and it'll rip your face off from zero to 60, but also get a nice combination with the OD and it cruises nice.

Re: 700R4 replacing 3 speed
 

I couldn't leave my switch on. My tranny has a reprograming kit in it and locks up in 2nd gear with the switch on. Talk about lugging an engine. :lol:

Re: 700R4 replacing 3 speed
 

Must be a newer edition. I know there are some variations of the 700r4. There are different wiring patterns. Mine only locks in OD.

Re: 700R4 replacing 3 speed
 

Mine too. If i leave the switch "ON", she bogs to a crawl as soon as it jumps into 2nd gear.

Sam

Re: 700R4 replacing 3 speed
 

Mine is a 88 year model

Re: 700R4 replacing 3 speed
 

Sam: Mine bogged to a crawl on the 2nd gear shift too, until i adjusted the TV cable and that extended the shift and took care of the problem. Had to adjust again and again, but finally got it just right.

Re: 700R4 replacing 3 speed
 

Not enough tension to hold off the lock-up, huh? Yeah, I got it sorted out. Now, mine will give you the PEZ-HEAD when it bangs second.

Re: 700R4 replacing 3 speed
 

What about putting a 200R4 instead of the 700R4? Will the 200 fit better?

Re: 700R4 replacing 3 speed
 

the 200 is a smaller trans a little harder to find though gm didnt have them around as long

Re: 700R4 replacing 3 speed
 

I have 1965 230 inline 6. Will the 700R4 bolt up to the 6cyl?

Thanks

Ken