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well heres the problem , my tranny's acting up on 1st to 2nd . when it's in 1st and rpms get to about 3500 i can feel it slipping ,then it will shift into second and keep slipping till rpms come up then goes into gear, 3rd and 4th work just fine . any ideas of what might be causing this other than it being a 4l60e? thanx in advance
The 1-2 clutch pack is most likely smoked. 4L60E isnt a bad transmission at all, it just needs to be built right and they can easily handle 450-550 horsepower and be reliable.
Mine is doing the same thing but I think it's because I towed 10,000 lbs with it. Shoulda bought a 2500HD :(
well had the tranny rebuilt . and guess what ? now 3rd 4th are gone, i was on my way home from work as i was going over a bridge it went to down shift then it lost 3rd and 4th . any ideas ?
its dead. new 3-4 clutches and other work needed to fix it right next time.
hope it just needs clutches . i did use altos red hps for all the clucth pack . are they junk or maybe just bad luck on the rebuild .
make sure you use the correct valve body gaskets. Wrong one will blow your 3/4 pack IIRC. You may have a leak somewhere in the input drum, leaking at a seal or the input shaft. Make sure you didn't nick any of the seals in the front drum.
I stick to BorgWarner clutches FWIW
let's see what bs the rebuilder gives me .