Permanent Tranny Mount
Thread Starter
TECH Apprentice
Joined: Sep 2011
Posts: 301
Likes: 5
From: Miami Beach, Florida
Permanent Tranny Mount Broke my tranny mount today for the 3 time in the past 2 months 
is there anyway to make a steel one, or make a permanent welded one. not worried about the vibrations i may get. the one just just broke was a red Poly mount.
thanks
is there anyway to make a steel one, or make a permanent welded one. not worried about the vibrations i may get. the one just just broke was a red Poly mount.thanks
Wow i have never heard of breaking a polly mount and 3 mounts in 2 months ? I had bad engine mounts that caused enough play in the driveline that wore out even my rubber tranny mount .
Thread Starter
TECH Apprentice
Joined: Sep 2011
Posts: 301
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From: Miami Beach, Florida
This was my first poly, expecting it to be there forever or atleast a long time. my 2 previous ones were the stock rubber ones from GM. i havent been abusing with hard acceleration only alittle haha. but still kinda stunned that the poly one broke. i pulled it in my dads shop pulled it up and found that the Red part cracked like an eggshell. idk what else to do but to just make my own?!
TECH Enthusiast
Joined: Aug 2010
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From: New Hampshire
This was my first poly, expecting it to be there forever or atleast a long time. my 2 previous ones were the stock rubber ones from GM. i havent been abusing with hard acceleration only alittle haha. but still kinda stunned that the poly one broke. i pulled it in my dads shop pulled it up and found that the Red part cracked like an eggshell. idk what else to do but to just make my own?!
If you have that much movement to break the polly mount somthing is causing the movement . look to other mounting points , engine mounts even the bolts that hold the tranny crossmember make sure they are tight .
Your gonna crack your trans case with a solid mount if you don't find out what is causing the issue.. Is the car lowered? How are the U joints? Is there bad vibes when driving?
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a solid trans mount will crack your tailshaft when the motor flexes under load unless you go with solid motor mounts as well. theres more going on then just mounts. something is causing it to break.
you could also get a relocation bracket for the torque arm to get it off the tailshaft of the trans. that might reduce some stress on the mount.
you could also get a relocation bracket for the torque arm to get it off the tailshaft of the trans. that might reduce some stress on the mount.
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Thread Starter
TECH Apprentice
Joined: Sep 2011
Posts: 301
Likes: 5
From: Miami Beach, Florida
Ok thanks guys i have the stock motor mounts, the rubber ones. i doubt theve had a finger print on them since 1994. yeah when i rev it the engine rocks like a cradle and so does the car. so im gonna check all the mounts. if my motor mounts are broke then problem solved. next time ill get the poly mount set.
well do you own a caprice or impala? just asking because maybe thats why you still have the stock ones lol but i could be wrong.
well do you own a caprice or impala? just asking because maybe thats why you still have the stock ones lol but i could be wrong.
Thread Starter
TECH Apprentice
Joined: Sep 2011
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From: Miami Beach, Florida
My friend has a 02 35th anniversary LS1 and when he revs his, the motor seems to be stiff in there pretty well and not so rockish. it only cradle about about half inch, and mine look almost like 2 inches
Theres your problem engine mounts. Get a full set for all mounts and your good to go !
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Joined: Aug 2010
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From: New Hampshire
Ok thanks guys i have the stock motor mounts, the rubber ones. i doubt theve had a finger print on them since 1994. yeah when i rev it the engine rocks like a cradle and so does the car. so im gonna check all the mounts. if my motor mounts are broke then problem solved. next time ill get the poly mount set.
On The Tree
Joined: Nov 2007
Posts: 134
Likes: 1
From: alabama
replace the engine mounts, in one of your other post you say your car has a little over 200k on it. I would change them first, put a new tranny mount in and then see what happens. And I would listen to people like 96capricemgr that have these 4000 lb cars running 11.50s you might learn something.
Thread Starter
TECH Apprentice
Joined: Sep 2011
Posts: 301
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From: Miami Beach, Florida
replace the engine mounts, in one of your other post you say your car has a little over 200k on it. I would change them first, put a new tranny mount in and then see what happens. And I would listen to people like 96capricemgr that have these 4000 lb cars running 11.50s you might learn something.
yeah im gonna replace them all and Yes im learning a lot! lol thanks guys
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From: New Hampshire
The root cause is your mounts, i know what mine looked like at 150k, I bet once you change the mounts out with polys you wouldnt break the trans mount anymore.
For what its worth, the vibrations from poly motor mounts isnt nearly as bad as people make it sound, I was worried when I switched but id say you only notice like 10% more vibrations then stock. And yes thats an exact measurement lol
On The Tree
Joined: Nov 2007
Posts: 134
Likes: 1
From: alabama
Didnt you say you have pacesetter headers, are they long tubes, if so you dont have any issues with them hitting the floor when the engine torques over? Also I run poly engine mounts with a rubber trans mount and havent had any trouble with it in 10k+ miles.
Thread Starter
TECH Apprentice
Joined: Sep 2011
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From: Miami Beach, Florida
Did you have rubber trans mount as well?
If you replace the motor mounts get poly ones. or if you dont want poly motor mounts, when you replace the trans mount switch back to rubber.
The root cause is your mounts, i know what mine looked like at 150k, I bet once you change the mounts out with polys you wouldnt break the trans mount anymore.
For what its worth, the vibrations from poly motor mounts isnt nearly as bad as people make it sound, I was worried when I switched but id say you only notice like 10% more vibrations then stock. And yes thats an exact measurement lol
If you replace the motor mounts get poly ones. or if you dont want poly motor mounts, when you replace the trans mount switch back to rubber.
The root cause is your mounts, i know what mine looked like at 150k, I bet once you change the mounts out with polys you wouldnt break the trans mount anymore.
For what its worth, the vibrations from poly motor mounts isnt nearly as bad as people make it sound, I was worried when I switched but id say you only notice like 10% more vibrations then stock. And yes thats an exact measurement lol
lol ok Poly kit it is. should i got with prothane bushings too?