4L60E in a GM A body??? - Lateral-g Forums

rallye455 · #1 06-12-2009, 11:53 AM

Should any floor pan modifications be required to install a 4L60E in a 1972 GM A body (1972 442 with a 455)?

E.rodz · #2 06-12-2009, 12:31 PM

i have not done this one yet ,but i have read a few articals on this and the tunnel needs to be enlarged. maybe a 700r4 might work better.

lewismd71 · #3 06-18-2009, 08:49 AM

The 4L60E is virtually identical to the 700r4. Only differences of notable mention is the case. Honestly if you are going to run a healthy motor you need to be looking into at least a 4L65E at a minimum.

That's my $0.02.

bocuracao · #4 06-19-2009, 02:48 AM

I have installed a 4L60E and LS1 into a 72 Camaro. I have also the Fatman frame stub, so it may be a little different from yours.
I had to cut a small rectangle on each side of the floor, appr. 5x3in right in front of where the floor has a stamping across, in order to have room for the new cross member. There was no problem with the tunnel, enough space there in my application.
I hope this information is useful for you.

Bo

**camcojb** · #5 06-19-2009, 08:30 AM

I have a 4L80E in my 64 A body and it fit without cutting the tunnel. I also have about 1.5" engine setback which would make it even worse, and the 4L80E I have is much larger than a 4L60E. I would think it would clear without cutting, unless the 72 has a smaller tunnel than a 64.

Jody

rallye455 · #6 06-19-2009, 05:11 PM

This is what I've got...I dont see anyway to get it to fit without cutting tunnel which I would prefer not to do other than repositioning the motor but I cant go much lower due to steeringrack interference.

**camcojb** · #7 06-19-2009, 06:09 PM

you're running a bellhousing adaptor it looks like, which if you are, is causing the issue. On a Chevy that trans bolts right up to the block and should clear fine, but with that aluminum spacer deal it shoves the trans right back into the tunnel.

Wasn't thinking of the Olds engine vs Chevy trans. Not the trannies fault, it's the adaptor that shoves the trans so far back. Is there anything shorter?

Jody

rallye455 · #8 06-19-2009, 06:30 PM

The adapter is only 1/8" thick. I'm just wondering if the motor is positioned correctly. I'm using the original 350 frame mounts and using 350 motor mounts which is supposed to position the motor the same as using the 455 frame and motor mounts (I checked this on several different sites and they say as long as you use the motor mounts that correspond to the frame mounts it positions the motor the same with the Olds motors). If I could remount the motor I would but cant go any lower because of the FR rack kit and by the looks of the headers its mounted just about perfect height wise. I dont mind cutting the firewall if thats what has to be done, I just want to make sure I'm not missing something obvious. I figured if someone else has done the swap they might have a better solution.