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Old 10-26-2010, 11:27 PM
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4L60E, Odd Problem.

My 4L60E is screwing up, Up-shifts just fine (Manually or if i just leave it in OD or 3rd) But if i downshift while going down a hill, i can feel the transmission engage the gear i put the shifter in, but it wont hold me back, it acts like its in neutral until you give it gas.

If i leave the transmission in OD and stop at a light and stomp on it, it will still lay rubber, or if i downshift to 1st and stop it will also lay rubber.

ATF is Fresh, just had a flush last Monday, It still looks new, no burning smell, and is all topped up.

Any ideas guys?

Also should add that im using a Holley TPS kit on my 670 Carb, So no more tbi, have been running this same setup for the last 2 months with NO problems.
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Old 10-27-2010, 05:33 PM
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No engine braking or no hold back

Is possible, do to no coast clutch operation. There is only two very small friction disks to supply engine braking, they don't take abuse well.
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Old 10-27-2010, 08:08 PM
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So no Engine braking?
Overrun clutches bad as Rexnfx said^^^.
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Old 10-27-2010, 08:16 PM
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So solution is to get a basic rebuild kit and replace all the clutches?
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Old 10-28-2010, 09:01 AM
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Don't know why I said coast clutch? But ya, overrun clutches...

A basic rebuild kit may do the job. BUt there are plenty of other things that wear also, good luck
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Old 10-28-2010, 12:28 PM
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Maybe i should just swap it out with the TH400 i have, even have a high stall for it.

Its one thing after another in this truck.
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