I have an 86 firebird 305, carburated. When i give it alot of gas the shifter will bounce up and down quite a bit and it will also lose power in sequence with the shifter bouncing. The power loss could be a part of another problem but im trying to figure out why its doint this. It also bounces over bumps to. It is manual transmission.

 

Trans mount

Same as everybody else's that does that

 

when my first trans mount went, I still had the automatic. That thing was banging around like it was trying to escape.
Not a hard repair.

 

It is four bolts and one nut on the brace and two bolts on the trans. Really simple to change with a ratchet and a jack to brace the trans.

 

Okay thanks, know how much it would cost roughly for parts and labour?

 

Labour doesn't cost anything.

The part is around $12 for a stock one, just like the one you got now that broke, or maybe $20ish for one that won't do that again the first time you let out the clutch ... a little .... too..... ,,, .... ,, ............ enthusiastically.

 

Before you make a decision about mount types, you might pursue the following link:

https://www.thirdgen.org/forums/tran...ison-pics.html

JamesC

 

^^ Good read. I Have my ES poly mounts (engine and xmsn) under my sb400/700r4 for 10 years now with no problems. With both a 2.73 and 3.23 posi and sticky 275's. I don't remember if I used the "preload" plate referenced in the article above. I never had any vibration issues with a steel or aluminum drive shaft. (My car is lowered about an inch with an adjustable torque arm though, so I don't have any driveline geometry issues.)
One caveat, I will never be able to shock the driveline with the worlds worst TCI 700r4 like you can by side-stepping the clutch.