99 Chevy 4l60e transmission swap

[JohnnyBad]

I am doing a charity transmission change in a 99 chevy k1500 truck and the guy brought me a transmission from another 99 chevy truck I installed it and went to put in torque bolts and the holes did not line up. After investigating further the transmission he brought me was from a 5.3 and his truck had the 5.7 is there any way I can make this trans work because we cant take it back.

 

[paratrooper307]

I am doing a charity transmission change in a 99 chevy k1500 truck and the guy brought me a transmission from another 99 chevy truck I installed it and went to put in torque bolts and the holes did not line up. After investigating further the transmission he brought me was from a 5.3 and his truck had the 5.7 is there any way I can make this trans work because we cant take it back.

Physically, it will bolt up minus one bolt. Since it's common to bolt an LS style motor to an older transmission (and vice-versa), there are adapter kits available. I'm not sure what all is involved, but there are issues with flexplate/converter spacing that have to be addressed prior to bolt-up.

Some examples:

http://www.jegs.com/webapp/wcs/stor...evrolet+Performance+Transmission+Adapter+Kits

19154766 might work for you.

 

[crashandburn]

Hold up, it may not work. You could easily swap bell housings, since they are bolt-on instead of a one piece case, but I recently did a ton of research on interchangeability. Some of those transmissions had a longer input shaft and different torque converter and I think it's the ones that came behind the LS motors. I remember something about the short version working with 4.3/5.0/5.7 only.

I'm not sure exactly what the conditions for the different versions are but I am sure there are different versions. In the old days, you could bolt pretty much any V8 motor to any transmission that came behind a v8. These 4l60Es had so many different versions it will make your head spin. It may work, but beware and measure everything and compare.

Good luck!

 

[JohnnyBad]

It bolted up just fine there don't seem to be any space issues other than the torque bolts don't match the holes in the flexplate. I was thinking about changing the flexplate but the one i would need does not have the balance weight and I don't know if the journal hole in the center is the same.

 

[Greg Ducato]

Abort this mission, the 5.3 trans and converter will not bolt up behind the earlier 5.7 engine, spacing is different in both bolt pattern and flexplate clearance. GM makes an adapter kit sold under part number 19154766 that is designed to mate these two. Pace Performance sells them for about $200

 

[JohnnyBad]

Ok thanks I have already pulled it back out and exploring my options