96tealTA

iTrader: (2)

When I launch, or if I floor it and the trans. downshifts to first, I get a weird thumping noise from the floorboards. Is it time for a new trans. mount or what? Oh, and it didn't do that before I had longtubes.

torquejunky

iTrader: (10)

its the headers/Y, it might be time to massage the floor pan, I'd try playing with the y-pipe first though

slowmofo

iTrader: (6)

yep, its your y-pipe hitting your floorpan.. It was a big problem in my 94 till I used a BFH mod..

THE CHOP SHOP

iTrader: (7)

Could very well be the y pipe. I would take a look at your trans mount though. Mine was shot at 60k. Pretty much ripped in half and barely hanging together. I got a energy suspension poly mount from autozone cause they had it on the shelf.

Caveman

iTrader: (2)

Losen the the clamps on the Ypipe +header and use a 3' pry bar to get a gap between the ypipe and floor board then retighten header and ypipe clamps.

fenix999

iTrader: (17)

either y-pipe is hitting or your trans mount is fubarred, or both.
good luck

crazykid

iTrader: (79)

Transmission mount

bboyferal

iTrader: (9)

What happens if you push up on the tranny... Is it loose?

Try that?

96tealTA

iTrader: (2)

Just bought a tranny mount. So I'll try that first, and I'll let you guys know.

crazykid

iTrader: (79)

You can generally see if the mount is broke or not, you will see rips and cracks in the rubber. 9 times out of 10 floor board thumping is caused by the mount. Let us know if it fixes it.


Kyle

gator's 99TA

iTrader: (2)

listen to this guy. Kyle is the ONLY guy that is allowed to work on my car.

bboyferal

iTrader: (9)

My motor agrees!

slowmofo

iTrader: (6)

yeah but it didn't start till he put the long tubes on, and the tranny mount is more of a banging in the tunnel, not the floor board..

Good luck OP let us know what you find..

SSJIMMY

iTrader: (8)

I will have to look at my tranny i have had the banging for a while now and just figured it was my y-pipe. how much is the mount not to much I would guess.

Eroc

iTrader: (1)

Trans Mount... Y-pipe would be one Thump at hard launch...

Tq Arm is kitting the Floor Pan I bet...
Trans Mount is none existant anymore...
You need to fix this ASAP...

Change in launch Angles can/will damage drive line and rear end.. also undo wear...

had this issue with my 89 ROC...

slowmofo

iTrader: (6)

poly mount is only like 20 bucks