anyone know why my car thumps a few times when i give it the gas? only at the beginning of gears...only if i floor it, feels like someone is hammering the bottom of my seat with a sledge hammer

92 RS 305, auto 5.0...tbi anything else needed???

 

Sounds like a broken tranny mount.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

yup, broke mine last weekend at the track.

 

Get an Energy Suspension replacement mount. The stock ones don't last long (at least the way I drive )

 

how much is an energy suspension mount? where can i get one? o yah, and i can just jack up my tranny and put it in right? i thought i saw an article on that...anyone?

 

Energy Suspension polyurethane mounts can be bought through Summit, either from the catalog or their website. You'll have to wait a little while, but no serious damage will occur to the tranny/drivetrain during that period, so long as you're not going crazy with it.

*aherm* How to change a Tranny Mount

1. Elevate your car, either by ramps on the front tires or jackstands. Do NOT support the car by a jack only.

2. Locate the crossmember. It is running across the transmission and will have five bolts in it: Two on each side, and one in the middle holding the tranny mount in place.

3. Slightly jack up the transmission using the transmission pan. If you don't have a transmission jack, a standard floor jack will do just fine, just be sure to distribute the pressure of the jack some. A lot of people use a flat, broad piece of wood, I use a book. heh.

4. Take off the four bolts on the edge of the crossmember. If your tranny mount is really broken, it should fall off after you get those bolts off. If it's not broke, or it's only partially broken, take off the middle bolt.

5. Now that you can see the tranny mount, you should be able to see two more bolts holding the other half of the mount to the transmission. These obviously need to come out too.

6. Bolt the NEW tranny mount (it should come with it's own bolts, and directions about how to mount it) to the transmission. You shouldn't have to tighten it all the way down yet, as you should be able to get to the bolts through holes in the crossmember.

7. Bolt the crossmemeber to the transmission mount. This will make it easier to start the bolts on the outside of the crossmember, as you don't have to hold it up yourself.

8. Put the remaining four bolts back in place. This part gets a little tricky sometimes because the crossmember never seems to want to line up again. This is due to settling of the car's frame, the transmission being at a different angle since you jacked it up, etc. Keep playing with it until you get all the bolts in pretty well, you may have to raise or lower the transmission slightly. After you get them mostly in, lower the jack off the transmission. Then, tighten down all of the bolts as best you can. I'm sure there's torque specifications, but I don't have them.

And now that you have a polyurethane mount you shouldn't ever have to worry about doing this again. Unless you've got some funky power going through that thing.

 

thanks alot!! i really hope its just something simple like a mount, i wanna put money into mods!! not repairs!!!

 

ok i just looked at the part descriptions, they only have them through 91, will this work on a 92? i would think so...wasnt a huge difference on the tranny in 92 was there? grr i hope it works...