Floorman279

iTrader: (11)

i ask this because i know in the past a certain poly trans mount has raised the trans causing pinion angle issues......are any poly mounts known to raise or lower the engine at all? any that are consistently the same size as stock? im running a new rubber trans mount.

drdave88

I just searched this the other day on here. Seems Prothane is the way to go, and avoid Energy Suspension ones. Not that they make the engine sit any different, just premature wear/failure from the ES ones.

Floorman279

iTrader: (11)

appreciate the tip. if you have any links of where you seen this please post. i couldnt find anything

drdave88

Here's one of them. I just googled poly engine mounts and searched specifically under LS1Tech and started reading. There's some comments here and there in the solid vs poly threads too about going with prothane too.

https://ls1tech.com/forums/generatio...ted-equal.html

Mgill

iTrader: (4)

what trans mount causes issues? Sorry to hijack the thread. I have prothane motor mounts they have be excellent.

lees02WS6

iTrader: (5)

I went with prothane. Unless you're pulling the engine, or the k-member, you only want to do this job once, so pick the right part.

Floorman279

iTrader: (11)

certain poly trans mounts push the trans tail up and require trimming.

and I tried googling just under ls1tech and got limited rezults. Appreciate the post

dr_whigham

iTrader: (49)

Prothane 100%. The Energy Suspension version with that plate is garbage.

99Silver6.0

iTrader: (2)

Floorman279

iTrader: (11)

so they appear to be the exact size as a "NEW" stock rubber mount? wont raise or lower it?

sjsingle1

iTrader: (1)

compared to a worn mount......poly will raise it some

Floorman279

iTrader: (11)

no i get that thats why i just wanna know if it raises it higher than stock? but it doesnt really matter i guess i will be running them anyway. thanks for the responses guys

sjsingle1

iTrader: (1)

Higher than stock ? No.....but if the worn stockers were sagging a half inch you are gunna swear they did raise it higher than stock

Toronto LT1

iTrader: (2)

where did you guys get your prothane mounts?

99Silver6.0

iTrader: (2)

leadfoot4

iTrader: (1)

FWIW, I installed the ES motor mounts in my car, and as I recall, they were a nice, snug fit, in the OE clamshells. As for longevity, I can't be too specific, as I sold the car almost 4 years ago. However I did have them in place for 3-4 years, prior to the sale, and I experienced no issues with them.

5.7stroker

iTrader: (36)

I saw I had ES in there and I changed them out for Prothane. Then I got a K member and did it all again because it's fun!

JimMueller

iTrader: (9)

I need new engine mounts. I know I don't want solid, but what am I going to notice from the cabin by going with Prothane engine mounts over the OEM rubber version? Any additional noise, vibration, or harshness?

HioSSilver

iTrader: (8)

The oe rubber mounts are definitely smoother. I wish someone made a firmer rubber mount. Poly pretty much sucks on everything besides sway bar stuff.

sjsingle1

iTrader: (1)

i noticed no diff switching to poly......but i do enjoy not having the engine rock back n forth from worn rubber

but a big vote NO on poly tranny mount from me