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I just dropped an Ls6 (zo6) motor in My 99 SS that was an Ls1 and if i down shift at about 60 mph into 2nd gear to take off with my automatic it makes a thump under the car like an transmission mount is broken but it's not? why is this and what can i do about it? Thanks alot!!
I am no expert but sometimes even if a tranny mount looks ok and is not ripped it still can have small tears in it or just be weak from wear. If you take a pry bar and gently pry under the trans-if it moves its the mount.
tranny mount..trust me
My guess would be tranny mount as well.
Replace the stock tranny mount with a prothane poly unit, no more thump.
SteveC :)
LOL yes had same problem we welded it to cross member,,but we are racing on round dirt track
+1 +1 +1
I JUST replaced mine about a week ago. I had the same exact problems you describe.
:haha: Thats one way to keep it from thumping.Quote:
Originally Posted by Pew