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Formula (Lt1 AUTOMATIC TRANS) I have a 1993 Pontiac Firebird Formula (the Lt1) with an automatic transmission. If I floor it off the line or floor it while in second so that it shifts into first, it makes this really loud knocking noise. It sounds like the transmission is almost banging up against the bottom of the car. What could this be? Transmission mounts? How much does it cost to fix?
I read in another question that it could be "the Planetary gear support spring is loose in the transmission ans hitting the case on downshift."

Is this an expensive fix?
 
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