My current project

[Skools Out]

Originally Posted by spareparts

now that we are on the subject, what would be involved in swaping out a 60e to a 80e in my 99 1500 Suburban. Its got 175k on it, I've changed the fluid on a regular basis. We bought it with 80 on it, so I don't know if the transmission was done before we bought it or not. We live in flat land and I've rarely towed anything with it(that may change). I figure when it hits 200, I'll start on the fresh block I have in the garage( have a fresh set of vortecs as well), I'll probably throw a little cam in it, with some good valve train, but otherwise leave it pretty tame. I might as well take care of the tranny while I'm at it, and I like the idea of towing in OD. I want the computer to work well with everything

why do you change the fluid? you shouldn't change the fluid in a GM trans as they will tend to shorten their lives. My L80 never had the fluid changed till the torque converter got noisey, that was at 218,000 miles. the trans shop plus 2 ASE Cert. said don't change it as long as your fluid stays red and clean run it. if the fluid gets dark then you have an issue in the trans. I changed it in 3 other of my GM products in the past all had short lives afterwards. On a trans go with the old rule if it ain't broke don't fix it. just change the trans fluid in the transfer case when it tends to clunk from stop lights.