up2late76

i was told by FLP that to fix the floor pan banging when i get on it, i need to put in a poly trans mount. are there any drawbacks to having one of these? some people say that you hear "all" the trans noises in the cabin... please help...

The Alchemist

iTrader: (19)

Instead of doing that, get yourself a ratcheting tie down strap from home depot or lowes and attatch it from the alternator bracket to the lower k-member. This will keep your motor from twisting excessively but won't transmit vibrations like the trans mount will/might.

I have a tr224 cam and my motor vibrates less now with the homemade torque strap than it did with the stock cam.

Oh, I'm lowered quite a bit and have my mac orp tucked up to within less than an inch of the floor boards and I get no banging at all.

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

MOBE

The poly tranny mount does help in some cases. I have one and I didn't notice a change in cabin noise.

<small>[ March 27, 2003, 07:03 PM: Message edited by: MOBE ]</small>

M3EATER

When I installed the poly trans mount.... I noticed a large increase in drivetrain vibration transmission.

I also, seriously doubt that it would help with your floor banging. It doesn't really limit the engine torqueing.

Gordon
www.provenperformanceconcepts.com

<img src="http://www.provenperformanceconcepts.com/PPC%20BANNER%20468x60.jpg" alt=" - " />

DONAIMIAN

iTrader: (18)

Go with a poly or solid motor mount, that should do the trick <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

FstBlkz28

iTrader: (13)

alot of people end up doing the 'heater hose mod'. i've done the heater hose mod to my Ypipe...it helped alot for the majority of the banging...however if my wheels break lose under accel... i still get banging. I'm going to try and put the poly mount back on my car to see if i can finagle a way so that it wont cause the vibrations it did the first time.

The poly motor mounts seem to be a sure-fire cure, however they will create alot of noise/vibration that wasn't felt/heard before.

up2late76

well that sucks, FLP told me a poly trans mount would fix it... some say it does, some say it doens't...

FstBlkz28

iTrader: (13)

u can always try the poly tranny mount.... its not that much if you put it on urself.

Tom L. Busby

I am the guy that always replies to this question. The poly trans mount is allegedly designed for the LT1, and it is a couple of mm's too tall. The top of the trans rubs against the tunnel and transmits a huge amount of noise at 2200 rpm and up.

A fix is to put one fender washer, with a 3/8ths inch hole I think, between the floor and the crossmember, at each of the 4 bolts that hold the trans brace to the floor. This will lower the trans back to stock height and the noise is basically gone.

A slight vibration is normal, but noise like a helicopter going by is not. The poly mount makes a little vibration you can feel through your feet rather than noise, to me, the way mine is set up, and the "rest of the story" is that I used 4 delrin fender washers.
Delrin is brand name for a harder and more durable type of nylon. It compresses very little and is a little harder than most polyeurathanes.

The theory for using delrin is that by connecting a material different than steel the harmonic vibrations are diminished. A friend of mine makes windsurfing masts and booms so finding delrin was easier than it may be for you. He carved it round on a lathe and drilled the center holes. I think they are 3mm thick