Thread: Tranny knocks when shifted to gear

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  1. #1 Re: Tranny knocks when shifted to gear 
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    Hi!
    I have noticed on my other car that even on 2000 rpm when i shift the gear the rpm is reduced and there is no knock sound.
    is there any mechanism to do so on the GP?
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  2. #2 Re: Tranny knocks when shifted to gear 
    Transmission Expert Trannyman95's Avatar
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    It may be excessive slop in the geartrain inside the trans or even a sticky valve in the valve body causing higher line pressure initially until it cycles. Up until 96/97 year the 4T60E did have a common problem of the drive shell inside the trans wearing and even stripping or coming apart and this will cause noise and eventually wear bad enough to break and will make a lot of noise and lose reverse. There is really no way to know this except for tearing the trans apart. Also you should check over all of the suspension components in the front end to make sure you arent getting noise from that. Have you tried having someone else sit in the car and cycle it through the gears and load the engine as I suggested in my last past to see if you can hear exactly where the noise is?
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  3. #3 Re: Tranny knocks when shifted to gear 
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    Hi Trannyman95!
    what happens when the engine is cold and then shifting into gear is that the entire engine moves a few inches to the front or to the rear depending on what the gear is shifted to.
    the noise is apparently from the engine movement and not from the tranny itself.
    on the last tranny oil and filter change (last week) i haven't noticed any debris other then the regular "metal powder" on the magnet.
    now I'm confused; all of the mounts are new. what's next???
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  4. #4 Re: Tranny knocks when shifted to gear 
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    The movement is normal and just the nature of a fwd vehicle that has the engine suspended with all rubber mounts. This is a reason I suggested checking all of the exhaust system to assure the hangers are all attached or in good shape because the engine is going to rock a bit forward and backward and anything attached moves with it. Even though your trans pan looked clean doesnt mean things are wearing inside and causing excessive slop which again you wont know without a teardown. Any front suspension component that is going bad can also cause clunk noises when going in and out of gear.
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