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Old 01-14-2013, 06:03 PM   #1
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Transmission mount recommendations?

Installed a polyurethane transmission mount from Energy Systems yesterday. Now at idle, the vibrations into the cab are so strong I can't see out my rearview mirrors! The polyurethane is too firm to absorb drivetrain vibes.

Other than going back to a stock mount, are there any other aftermarket brands or materials you'd recommend?

Stock and aftermarket are similar in price. But the stock ones seem to breakdown sooner- mine only had 50k miles on it. Thanks

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Old 01-14-2013, 08:22 PM   #2
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transmission mount?? Do you mean from the transmission to the skid plate? or skid plate to the frame?

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Old 01-14-2013, 10:34 PM   #3
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Transmission to skid plate. Here's a pic

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Old 01-14-2013, 10:37 PM   #4
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And the brand was Energy Suspension, not Energy Systems.
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Old 01-14-2013, 10:41 PM   #5
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Race grade, solid mounts, or super firm bushings/mounts do not absorb as much energy, they transmit it more directly. Not much of a way around that.
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Old 01-15-2013, 01:08 AM   #6
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ah okay, thats what i thought you were talking about. haha didn't realize they had 'performance' parts for that particular piece.
Makes sense it transmits more directly, less loss in the system.. any idea if its even remotely substantial?
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Old 01-15-2013, 07:45 AM   #7
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Could also be that if the old mount was driven on for awhile & it made wear patterns in the u joints. Kinda like rotating tires, where everything feels funny at first. The new mount could have corrected the angles being off slightly and that could cause vibration.
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Old 01-15-2013, 07:55 AM   #8
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What kind of motor mounts do you have? I'm guessing rubber. If that's the case, then that's a big source of your vibes. Differing materials in the trans and motor mounts will cause some serious vibes. Also, all of the rotational torque is at the motor--the soft stock rubber mounts allow a lot of movement. The poly mount at the trans does not so now they're fighting each other. The poly mount will lose the battle eventually since it doesn't deflect nearly as much as the stock rubber.

I use Brown Dog rubber motor mounts--much stiffer than stock and they deflect a lot less, providing better throttle response and an overall 'tighter' feel. At the trans, I run a crossmember from Savvy, which uses Clevite rubber bushings. The manner in which the trans is constrained doesn't allow much movement at all, unlike stock. It's been a very long time since I've had the stock motor and trans mounts but my rig is comfortable enough for DD use. It's a complete non-issue and I actually prefer the tighter feeling well-designed mounts with good materials provide.

For you, I'd go back to a stock rubber mount. If you'd like to start making some changes to your belly height, I'd recommend some BD rubber mounts and either the rubber UCF LoPro mount or the Savvy route.
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Old 01-15-2013, 09:04 AM   #9
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Quote:
Originally Posted by Ohio79 View Post
Could also be that if the old mount was driven on for awhile & it made wear patterns in the u joints. Kinda like rotating tires, where everything feels funny at first. The new mount could have corrected the angles being off slightly and that could cause vibration.
Its perfectly smooth above 1k RPM. Only vibrates at idle, while stopped.
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Old 01-15-2013, 09:12 AM   #10
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What kind of motor mounts do you have? I'm guessing rubber. If that's the case, then that's a big source of your vibes.
A motor mount cannot possibly be a source of vibration.
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Old 01-15-2013, 09:24 AM   #11
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Quote:
Originally Posted by Imped View Post
What kind of motor mounts do you have? I'm guessing rubber. If that's the case, then that's a big source of your vibes. Differing materials in the trans and motor mounts will cause some serious vibes. Also, all of the rotational torque is at the motor--the soft stock rubber mounts allow a lot of movement. The poly mount at the trans does not so now they're fighting each other. The poly mount will lose the battle eventually since it doesn't deflect nearly as much as the stock rubber.

I use Brown Dog rubber motor mounts--much stiffer than stock and they deflect a lot less, providing better throttle response and an overall 'tighter' feel. At the trans, I run a crossmember from Savvy, which uses Clevite rubber bushings. The manner in which the trans is constrained doesn't allow much movement at all, unlike stock. It's been a very long time since I've had the stock motor and trans mounts but my rig is comfortable enough for DD use. It's a complete non-issue and I actually prefer the tighter feeling well-designed mounts with good materials provide.

For you, I'd go back to a stock rubber mount. If you'd like to start making some changes to your belly height, I'd recommend some BD rubber mounts and either the rubber UCF LoPro mount or the Savvy route.
Thanks man, good insight. My motor mounts are stock- that makes sense. I do like the improved shifting and throttle response with the poly transmission mount. Planning to keep the stock skid. I'll add BD rubber motor mounts to see if that reduces engine movement that gets transferred to cab via the transmission/skid plate. Worst case, I can easily go back to all stock rubber mounts if I don't like that setup.
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Old 01-15-2013, 09:41 AM   #12
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If you did not have vibes before when using an OE mount why not stick with what " YOU " know works unless you have no choice. Change the motor mounts and if you still are unhappy with the vibes that you have then you have 3 to change plus more money spent . I try to stick with what "I" know works . I hate any vibes at all from any part of the Jeep and do what ever I can to not have any .
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Old 01-15-2013, 09:42 AM   #13
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Quote:
Originally Posted by tangofox007 View Post
A motor mount cannot possibly be a source of vibration.
Splitting hairs but good catch. Replace "source of" with "reason for."
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Originally Posted by Duma View Post
Thanks man, good insight. My motor mounts are stock- that makes sense. I do like the improved shifting and throttle response with the poly transmission mount. Planning to keep the stock skid. I'll add BD rubber motor mounts to see if that reduces engine movement that gets transferred to cab via the transmission/skid plate. Worst case, I can easily go back to all stock rubber mounts if I don't like that setup.
If you're planning on keeping the ES trans mount, I'd suggest running similar poly motor mounts. I'm not saying this will cure your vibes but it should help. With poly all around, you will likely still get some idle vibes.
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Old 01-15-2013, 09:46 AM   #14
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If you did not have vibes before when using an OE mount why not stick with what " YOU " know works unless you have no choice. Change the motor mounts and if you still are unhappy with the vibes that you have then you have 3 to change plus more money spent . I try to stick with what "I" know works . I hate any vibes at all from any part of the Jeep and do what ever I can to not have any .
My stock motor and trans mounts 'worked' just fine. I changed the motor mounts because I wanted less drivetrain movement/deflection and I first changed out the stock trans mount because it was too tall. As with most things under a TJ, there's room for improvement from the factory and the stock motor and trans mounts are no different.

But I somewhat agree, I don't see why a stock replacement wouldn't work fine for your uses, OP.
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Old 01-15-2013, 01:45 PM   #15
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Thanks for the input guys. The reason I'm willing to experiment with the mounts is because I enjoy working on my Jeep, I can swap out all 3 mounts in less than an hour if I don't like the results and total cost is under $100.

For what it's worth, after putting in the trans mount yesterday it was fun to blip the throttle in neutral and see the whole Jeep torque a little. It didn't do that before!
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Old 07-02-2013, 08:29 AM   #16
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To replace the transmission mount you have to drop the TC skid plate?
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Old 07-02-2013, 08:38 AM   #17
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Yes.....
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Old 07-02-2013, 09:28 AM   #18
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Yep go with rubber. My experience with polyurethane mounts was short lived due to the vibrations, it wasn't long before I went back to rubber for both my engine and transmission mounts. There's a reason the world's automotive manufacturers still use rubber there.
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Old 07-02-2013, 09:46 AM   #19
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Just put a new OEM rubber mount on the jeep yesterday, along with an MT-90 fluid swap. Couldn't be happier. Stopped the knocking around when accelerating, and nice clean shifts. Save your money, like Jerry said, there's a reason it's rubber.
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Old 09-24-2013, 08:27 PM   #20
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Old 09-25-2013, 09:42 AM   #21
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Yes those will work.
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Old 09-25-2013, 10:02 AM   #22
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I just bought a Anchor 2882 (something like that) mount from Oreillys. Haven't installed it yet but seems to be just like the stock mount.

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