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How to tell bad torque arm bushing?

This is a discussion on How to tell bad torque arm bushing? within the Drivetrain forums, part of the LSx Technical Help Section category; I was under my car today because ive been hearing light clunk while on the lightly stepping on the gas ...

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    How to tell bad torque arm bushing?

    I was under my car today because ive been hearing light clunk while on the lightly stepping on the gas or letting off the gas. I was thinking it could possibly be the u-joints but could feel any play in there and dont really know how to see if theyre bad anyways?

    The trans mount has been replaced with a poly because the stock one broke so i know its not that. I could wiggle the torque arm in the mount and good 1/8th of an inch up and down. I dont know how tight this is supposed to be and am wondering if it could be causing the sound? The bushing has a slit in it on the bottom right which looks kinda like it suposed to be there but is it?

    Also i could feel very slight play in the output shaft of the tranny by pushing it up and down, is that normal?

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    Quote Originally Posted by got-a-ls1
    I was under my car today because ive been hearing light clunk while on the lightly stepping on the gas or letting off the gas. I was thinking it could possibly be the u-joints but could feel any play in there and dont really know how to see if theyre bad anyways?
    look for play where the + part of the u-joint goes into the cups that hold the needle bearings.

    Quote Originally Posted by got-a-ls1
    The trans mount has been replaced with a poly because the stock one broke so i know its not that. I could wiggle the torque arm in the mount and good 1/8th of an inch up and down. I dont know how tight this is supposed to be and am wondering if it could be causing the sound? The bushing has a slit in it on the bottom right which looks kinda like it suposed to be there but is it?
    1/8" is ok. not great. check the bolts that hold the torque arm to the rear. also, looks for cracks in that same area.

    Quote Originally Posted by got-a-ls1
    Also i could feel very slight play in the output shaft of the tranny by pushing it up and down, is that normal?
    yes, normal.

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    so whewn checking the ujoints should i look by turning it or push the driveshaft up and down? because i turned the driveshaft by hand and didnt notice any obvious play

    thanks!

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