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Poly trans/engine mount or stock?

This is a discussion on Poly trans/engine mount or stock? within the Firebird / WS6 forums, part of the Vehicle Specific category; I recently ripped my trans mount in half due to a shift kit and lots of torque. It had the ...

  1. #1
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    Navy Blue Metallic
    1998 Trans Am

    Poly trans/engine mount or stock?

    I recently ripped my trans mount in half due to a shift kit and lots of torque. It had the 1LE mount so it had its run for 10 years but I really want to put in poly trans/ motor mounts in because everytime i floor my car my exhaust pipe hits the floor board under me due to engine flex (the exhaust was put in a month after the car came out in 98 so it hits due to poor engineering not bad mounts) Im going to replace the trans mount regaurdless but i dont know what to put in....i definitely want a stronger trans mount and engine mounts but i heard if you go poly the vibrations kill youu...i dont want vibrationss so any suggestions?

  2. #2
    Member TransAmX2's Avatar
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    Navy Blue, Dark Cherry
    98 M6 TA, 87 A4 TA

    I went poly and don't regret it, I don't think they cause much more vibration than new rubber mounts, it may feel that way going from a whooped rubber mount to a new poly but it's not that bad, the firm feel of the shifter is well worth it for me, no shifter swaying right or left as i rev the engine or up and down when I accel/decel.

  3. #3
    Member godless-phoenix's Avatar
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    Blackened fire chicken
    2000 Pontiac Trans Am WS6

    if you put poly motor and tranny mounts on your car, you would have to adjust the angle on your torque arm, witch would mean buying an adjustable torque arm...anyone correct me if im wrong . same shit happened to me, ripped the stock tranny and motor mounts. i put a poly tranny mount on, and i couldnt stand the vibrations, and its due to the angle of the driveshaft being thrown off from the different sized mount im assuming, witch can be adjusted witch an adjustable torque arm. i dont think its worth the trouble unless your actually taking your car to the track, if its just a street car, just get the stock mounts and imo

  4. #4
    Member TransAmX2's Avatar
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    Navy Blue, Dark Cherry
    98 M6 TA, 87 A4 TA

    Quote Originally Posted by godless-phoenix View Post
    if you put poly motor and tranny mounts on your car, you would have to adjust the angle on your torque arm, witch would mean buying an adjustable torque arm...anyone correct me if im wrong . same shit happened to me, ripped the stock tranny and motor mounts. i put a poly tranny mount on, and i couldnt stand the vibrations, and its due to the angle of the driveshaft being thrown off from the different sized mount im assuming, witch can be adjusted witch an adjustable torque arm. i dont think its worth the trouble unless your actually taking your car to the track, if its just a street car, just get the stock mounts and imo
    The poly mounts shouldn't change your pinion angle, but would transfer more of the feel from an off pinion angle or other worn drivetrain parts.
    I noticed little difference when I went to my poly tranny mount except for a firmer feel in the shifter.

  5. #5
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    Black & Blue
    '02 WS.6 / '07 Suburban

    I installed a poly transmission mount in our car a few months ago. It lasted all of 2 weeks before I put the stock mount back in.

  6. #6
    Senior Member JayTA98's Avatar
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    Mean Black
    1998 Trans Am

    i had also had the tranny poly mount vibrations after install. I measured from the floor to the tranny and it was about 1/4 inch taller than the stock one. I replaced it with OEM one and strong vibrations were gone.

  7. #7
    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
    2001 Camaro SS

    Honestly I have poly trans and motor mounts and I cant tell the difference, then again my stock ones were shot

  8. #8
    Senior Member JayTA98's Avatar
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    Mean Black
    1998 Trans Am

    i dont know maybe it had to do with having my stock engine mounts at the moment...

  9. #9
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    silver
    2000 formula

    poly or stock.......the rubber is most likely shot after all these yrs.........so change it out no matter what you choose

  10. #10
    expensive tires az gt eater's Avatar
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    04 2500 4x4 crew cab

    My poly is vibrant. I like it, but you won't. Just do the stock ones if you don't want vibration.

  11. #11
    Waiting on the Tree transamtom's Avatar
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    NBM
    1999 TA A4

    I did the poly on my 94 TA,I hated the vibration on the highway.

    I went back to stock on that car and put a stock one in my 99 TA when it broke.

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    Navy Blue Metallic
    1998 Trans Am

    Quote Originally Posted by az gt eater View Post
    My poly is vibrant. I like it, but you won't. Just do the stock ones if you don't want vibration.
    yes but i want strength...i dont want to turn my shift kit on and it snap right away i want durability

  13. #13
    Auto Painter RyanJM's Avatar
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    White
    1998 Trans Am

    I didn't notice it after a day or 2 it's such a slight difference
    1998 Trans Am 85k miles.
    Bolt ons, MS3 113LSA cam, Circle D Stall, Tune, Modified WS6 style hood, Full Suspension, 6000k HID's, Clear Side Markers w/ Leds, Led 3rd Brake Light and 18" AR Staggered Killer Wheels w/ BFG KDW NT's.- Weekend Toy/DD
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  14. #14
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    Navy Blue Metallic
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    Quote Originally Posted by RyanJM View Post
    I didn't notice it after a day or 2 it's such a slight difference

    so your telling me that if i get poly motor/trans mounts, after a few days i wont be able to tell the difference from stock ones??

  15. #15
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    '02 WS.6 / '07 Suburban

    I am guessing it depends upon which poly mount you get. Seems that it is hit or miss as to how bad the vibration is.

  16. #16
    Senior Member Lunatikgixxer's Avatar
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    Bat mobile black
    2000 Trans am WS6 M6

    i just recently put new poly motor/tranny mounts in about 2 months ago and theyre a hell of a lot better than the shot stock ones i had. No different pinion angle either..

  17. #17
    Member My00Z28's Avatar
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    2000 Camaro Z28 A4

    i have poly motor mounts and went to a poly trans mount.... worst experience i ever had, the car felt that the pinion angles were off from 40mph on, went to the strip when i hit 3rd gear(A4) i thought the car was going to fall apart, switched it back to the stocker 2 days later both mounts were exactly the same height side by side....

  18. #18
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    '02 WS.6 / '07 Suburban

    How about some brands and/or part numbers so we can compare our respective experiences with poly trans mounts? Could be there is one out there that just works better than the others.

  19. #19
    Member My00Z28's Avatar
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    2000 Camaro Z28 A4

    my mount brand was "Prothane" P/N: 7-1604

  20. #20
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    I have to go look -- mine was either Energy Suspension or Prothane and it was awful.

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