my troublesome 4L60E
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Teching In
Joined: Feb 2004
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From: Alexandria, VA
my troublesome 4L60E some suggestions would be appreciated. i have a 99 Z28 and my tranny is worrying me. I had it rebuilt at 60,000 miles and it now has 76,000 miles. Its making some strange noises. when i let my foot off the brake with the car in dr., it makes a funny clunk sound that can be felt as well. also, when i get on the throttle and the rear wheels don't break loose there is a series off loud banging noises on the rear floor boards. this only happens when i DON'T lose traction. so i have a car that i'm afraid to drive like a camaro and instead drive it like its and old crown vic. is anyone else experiencing problems similar?
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Could very well be the trans mount. Can you feel anything weird in your shifter? Try stalling it up a bit in any gear and hold your hand on the shifter, now let off the brake and jump on the gas a bit. Do you feel anything in the shifter? Maybe a vibration or something like a pounding/jumping/bouncing/banging? That would likely be a trans mount if so.....
Best way I found to check for a broken trans mount is when you take off at 1/4 throttle you would hear something hit then when you step on the brakes fairly hard you would hear something hit.
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
Once I suspect that a mount is broken I usually just get under the car and use a pry bar to push the trans up from the crossmember and see if the mount lets it go. Any cracks in the mount become very apperent at that point......
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From: Alexandria, VA
man i checked it
Originally Posted by maddboost
I guarantee you broke your tranny mount.
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So you checked the trans mount today? You dont need any mods to break a tranny mount I broke mine when my car was stock and my buddy broke his in his LT1 the first week he had it.
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Teching In
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From: Alexandria, VA
Originally Posted by maddboost
So you checked the trans mount today? You dont need any mods to break a tranny mount I broke mine when my car was stock and my buddy broke his in his LT1 the first week he had it.
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From: Michigan
Originally Posted by soldierdude
when i got it safety inspected last month and it was up on the lift, so i borrowed a pry bar and couldn't budge it. its done this ever since i bought it used at 39k miles. i have no mods to speak of but i have big plans for a 427ci stroker motor. that stock tranny won't hold the hp i'm thinking of. what do you think of a turbo 400 street raptor from transmission center. its rated at 1000hp but its $3700. what tranny would you suggest?
Originally Posted by soldierdude
what kind of trans are you putting in your Z? i'm kind of in the market for one. i don't have too much faith in the 4L, will a T56 fair any better for serious hp?
