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.

[parishht]

Actually, my wife's CR-V has to have the fluid changed every 36,000 miles.
HONDA knows of the problem, put out a service bulletin that admits the problem,
but will only pay for one change, after that we have to pay.

[Skools Out]

lol that's a rice burner though not a GM trans

[cterrebonne]

im sure those techs knwo what they are talking about but it doesnt seem to make any sense to me. you only change half of the total fluid anyway and i dont think a filter would hurt anything. in my case my trans was making noise before and after so i dont know

[Skools Out]

there's fluid in certain areas they stay in place and hold valves in place but once you drain the pan then if the chance those vlaves move due to no fluid they might go the wrong way then keep fluid in incorrect areas of your trans which then cause's it to die fast and early, the rule is in 3,000 miles after the fluid change you will either still be running or pushing. don't you think if they wanted or thought the fluid needed changing they would have installed a drain plug? there's no drain plug in a trans on the GM stuff.

[THEFERMANATOR]

Originally Posted by Skools Out

there's no drain plug in a trans on the GM stuff.

Many of GM's trucks came with drain plugs after 97, and my ALLISON DEFINATELY has one. I for one personally believe in changing the fluid AND filter every 30K for a daily driver, and every 15-20K for a vehicle that gets worked. I've seen WAY too many GM trannies get diagnosed as bad or fail because of lack of maintence. And when I was at DODGE you could tell if one hadn't been changed by how loud they were on a cold start. After about 40K miles the tranny will howl on a cold start if the fluid hadn't been changed. The problem with fluid changes is if you haven't kept up on it by the book, then don't do em at all. Once you go more than 30K without a fluid and filter change you will get particle build-up inside the valve body. If you change the fluid and filter after this has gotten built up, the fresh additives in the new fluid will almost certainly clean that build up out and deposit it in areas you don't want it.

[cterrebonne]

[QUOTE=THEFERMANATOR;The problem with fluid changes is if you haven't kept up on it by the book, then don't do em at all. Once you go more than 30K without a fluid and filter change you will get particle build-up inside the valve body. If you change the fluid and filter after this has gotten built up, the fresh additives in the new fluid will almost certainly clean that build up out and deposit it in areas you don't want it.[/QUOTE]


thats pretty much the mantra i use for them. i was only at 30K after the rebuild when i changed the fluid.