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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

polyeurothane mounts??

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Old 11-18-2007, 06:23 PM
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Default polyeurothane mounts??
I just replaced my broken tranny mount with a urothane (Energy Suspension) mount and mann this is harsh!! I feel every vibration and loud as a log truck. Is this normal??? I might switch back to a rubber mount??
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Old 11-18-2007, 06:44 PM
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very normal
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Old 11-18-2007, 06:56 PM
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Auto or 6-speed? When I put one in when I had an auto I took it right back out, but with my 6-speed it didn't vibrate anymore than stock.
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Old 11-18-2007, 07:25 PM
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I have a A4 and its not that bad with the Energy Suspension mount
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Old 11-18-2007, 08:13 PM
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mine vibrates between 100-130 k/h but smooths out considerably after that.
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Old 11-18-2007, 08:20 PM
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it's a auto. It vibrates the most under acceleration, but as soon as you let off then it's noisy. It's like I bolted it directly to the chassis. I was going to replace the engine mounts also but I don't know now???
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Old 11-18-2007, 08:24 PM
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I've got poly motor mounts and tranny mount on mine (M6) and it doesn't seem any better or worse than the old rubber ones.
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Old 11-18-2007, 08:30 PM
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Well maybe the A4 vibrates more the M6????? I'll have to get used to it I guess..
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Old 11-18-2007, 10:09 PM
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Tried it on both of my 4th gens, ended up taking it off and swapping for a standard LS1 mount.
The ride was too harsh for a DD with a chassis-mounted torque arm; I just replace em as I break em.
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Old 11-18-2007, 10:10 PM
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yep my m6 mount doesn't seem any worse than stock (but i know it is cuz it broke a motor mount). but it seems like all the a4 guys complain.
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Old 11-18-2007, 10:11 PM
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x2 for the ls1 mount
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Old 11-18-2007, 11:47 PM
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what's different between a LS mount and the LT1 mount??
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Old 11-19-2007, 12:02 AM
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The LS1 mount has a bult in travel limiter. I modify them and limit them even more. had them going into the nines no problems and quietly drive home from the track
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Old 11-19-2007, 12:41 AM
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There's something else wrong if that's happening. I'd say motor mounts too are toast. I put that same mount in my TPI car after the trans mount was obliterated (trans hitting tunnel) and I never experienced anything like that.
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Old 11-19-2007, 07:50 AM
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Originally Posted by TwoFast4Lv
The LS1 mount has a bult in travel limiter. I modify them and limit them even more. had them going into the nines no problems and quietly drive home from the track
Travel limiter and tougher rubber.
Anymore, I think the dealerships only offer the LS1 mount anyhow.
It looks like Advance Auto still sells both.

LS1 Mount


LT1 Mount
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Old 11-19-2007, 09:41 AM
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^^^ what do i need to modify if i want to use LS1 tranny mount on my LT1?
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Old 11-19-2007, 11:41 AM
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Originally Posted by Toronto_LT1
^^^ what do i need to modify if i want to use LS1 tranny mount on my LT1?
I too am curious, not that I think I need to replace mine yet. But it looks like trim some metal off? Or was it elongating the bolt holes?
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Old 11-19-2007, 01:25 PM
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Originally Posted by Toronto_LT1
^^^ what do i need to modify if i want to use LS1 tranny mount on my LT1?
It's a direct replacement. No modification required.

Like I said above, most places don't even bother with LT1 mounts anymore,
the LS1 mount PN replaced it in most parts lists.
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Old 11-19-2007, 02:29 PM
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Originally Posted by James Montigny
It's a direct replacement. No modification required.

Like I said above, most places don't even bother with LT1 mounts anymore,
the LS1 mount PN replaced it in most parts lists.
Good deal.
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Old 11-19-2007, 08:06 PM
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FYI, I started a thread on rubber vs poly trans mounts in the auto trans forum, might have some useful info:

https://ls1tech.com/forums/automatic-transmission/812849-transmission-mounts.html
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