Ok guys..here goes...92 z-28 46,000 miles..mods are borla exhaust..and hyper tech thermo-master chip..ok..when i put the pedal to the metal..and the 700r4 shifts from first to second..i get a nice big thud...sounds like from underneath the passenger floor pan..could it be...the cat's banging the floor board? torque arm? tranny mount? u-joints? gonna check it out this weekend just wanted to get some opinion's..thanks guys later.

 

check your trans mount, i bet it's broke. replace it with a ES poly mount and you'll never have to worry about it again

 

yep...tranny mount is messed up..just ordered one from summit racing...poly unit...$20.95.

 

I am starting to have the same problem. It makes a big thump when it shifts. Is the tranny mount easy to see if it is broke? Thanks for any help you can give.

Brian

 

if i was going ot the trouble to get under the car to look i'd just replace it with a ES poly mount. not hard to do

 

check the u-joint and trans. fluid juuuuuuust incase.

Akshay
1989 RS 2.8 5-spd.

 

Checking the trans mount is easy.

1. Get the car off the ground. I like Rhino Ramps for this kind of work.

2. Remove the single nut holding the trans mount to the crossmember.

3. Place your jack under the transmission pan.

4. Using a large block of wood to distruibute the force of the jack, gently start lifting the transmission.

5. Once the weight is off of the trans mount, you should be able to see large cracks in the rubber bushing. Pieces of this may fall out. If this is not the case, you are now two bolts and 5 minutes away from a full R&R of the transmission mount anyway, so:

6. Get off your cheap, lazy butt and call Summit for the ES poly mount.

7. Install new poly mount, lower car and enjoy new, tighter feeling driveline.

 

Put a pry bar between the crossmember and the transmission and pry upwards my transmission snapped the rubber right off the metal so I put a mount from a caprice (autozone) in it they are solid metal just a thought.