Manual Transmission - Prothane vs. ES trans mount

I searched tonight but didn't find the answer I was looking for. I remember reading a while back that the Prothane trans mount had less NVH than the Energy Suspension mount.

When I did my H/C/I/E install a while back I installed ES poly engine mounts and trans mount.

I have a vibration at 2000-2500 rpms. It does it in neutrul(6 speed car)and going down the road. When driving I can feel when I hit 2000 rpm.

I have a SLP underdrive pulley and Monster 3.5 clutch, well I did have a Monster 3.5 clutch until I killed it.

I figured my vibration was from
1. SLP U/D pulley, even though I've never read any problems with them as compared to other U/D pullies.
2. The clutch assembly I had wasn't balanced correctly.
3. Poly engine mounts
4. Poly trans mount
5. Combination of 3 & 4

The trans is out right now due to the as for mentioned clutch dying. I will be getting a new Monster stage 2 clutch here soon and I'm thinking about replacing the ES trans mount with a Prothane.

I did use the shim included with the E/S mount. As best as I can remember, the ES mount itself was not as tall as the stock mount. With the shim installed they were the same height.

I'm going to have the driveshaft balanced while its out. However I don't think that is the problem because it does it in neutral. You can feel it through the entire car. It's kinda of a pulsation if that makes sense.

I don't believe its engine related, I've replaced the plugs and wires and its still there. No misfires that I can see on the scanner.

Without knowing exactly what problems/NVH the poly mounts cause, I'm can only guess thats my problem.

Thanks for any help.

J

Put a oem trans mount in. I took out my poly trans mount the next day it was so bad

Im with the guy above me. With the poly motor mounts you dont need the poly trans mount. The poly motor mounts dont let things move at all and when i had the poly trans mount all i had was vibration. Stock mount made all of that go away...even in my high powered car i have no worries

Prothane, it's a little easier on the car, and you don't have to worry about any preload plate crap. Prothanes are more precise to the stock mount size.

I believe in poly trans mounts, but many do not. The reason everyone hates them is because at first they create vibrations, but they DO soften up after some driving (I noticed mine soften up maybe 2 weeks of light driving). I have NONE of the initial vibes I had when I first installed it. If you put one in, give it time to soften up, it will. I like them because they keep the shifter firm in place, which to me, improves my shifting. :)

By the way, you will still feel an out of balance driveshaft in neutral.

I'm chasing a new vibration that happened after I broke my stock driveshaft. I've narrowed it down to the tailshaft bushing, which I have ready to replace, I'm just waiting for a good time to do the work! :jest:

Agree with HoLLo. The Prothane is great, no plate to deal with, no BS.
My shifter no longer seems like it took a Viagra when I stomp on the pedal either.
The vibes WILL calm down after a week or so.

Prothane, it's a little easier on the car, and you don't have to worry about any preload plate crap. Prothanes are more precise to the stock mount size.
I had a prothane trans mount, couldnt stand it!

I believe in poly trans mounts, but many do not. The reason everyone hates them is because at first they create vibrations, but they DO soften up after some driving (I noticed mine soften up maybe 2 weeks of light driving). I have NONE of the initial vibes I had when I first installed it. If you put one in, give it time to soften up, it will. I like them because they keep the shifter firm in place, which to me, improves my shifting. :)

Getting the torque arm mount off the trans housing will cure the shifter jumping as well.

I used both the prothane and E/S trans mounts and the E/S mount had alot less vibration then the Prothane. I would stay with the E/S mount from my experience.

I have Prothane engine/trans mounts in BOTH of our WS.6s. Mine being a built/stalled auto, and my wife's being a cammed/full bolt on 6 speed. Really dont have much vibes in either car to tell the truth. Been probably 8 months since Ive installed the polys in both cars.

I have a vibration at 2000-2500 rpms. It does it in neutrul(6 speed car)and going down the road. When driving I can feel when I hit 2000 rpm.

I figured my vibration was from
1. SLP U/D pulley, even though I've never read any problems with them as compared to other U/D pullies.
2. The clutch assembly I had wasn't balanced correctly.
3. Poly engine mounts
4. Poly trans mount
5. Combination of 3 & 4A taller mount that changes u-joint angles can cause a vibration of the driveline.

I did use the shim included with the E/S mount. As best as I can remember, the ES mount itself was not as tall as the stock mount. With the shim installed they were the same height. I don't think so. This thread is interesting, since the 1108 is so widely distributed, I didn't know about the others: http://ls1tech.com/forums/manual-transmission/1544489-thinner-trans-mount.html

Start by shimming the crossmember lower with washers and longer bolts. If resolved, shop for a lower height mount using the above thread link.

With regard to durability of the trans. mount and NVH, get the torque arm off the tailhousing and onto a non-stock or modified crossmember. Then you'll have a quieter car that's durable. The rubber mounts last a long time in cars without torque arms.

Still, the Prothane is a better transmission mount.

I don't think so. This thread is interesting, since the 1108 is so widely distributed, I didn't know about the others: http://ls1tech.com/forums/manual-transmission/1544489-thinner-trans-mount.html


I ended up buying all three of the ES mounts and two of them were the same height (1.937") and one was about 1/2" shorter. The information I posted was what ES told me, and was inconsistent with what I received from Jegs. Of the two that were the same height, one has a slightly different shape to the polyurethane part, otherwise they were identical. I will try to find out what part number is what.

So the 1158 is the short one, 1108 and 1142 are the same height.

When you use the ES tranny mounts, you can't use the metal plate with them. From what I've seen on here and my personal experience, Prothane is the go-to tranny mount for poly 100%, the ES always ends up being crap.

But in the end the OEM rubber style tranny mount is the best bet. I've never killed one and a fresh rubber mount works great with no vib issues. I get mine from Napa for around 10 bucks. I can get you a part number if you want it :)

93z383, I looked at the NAPA website and the only tranny mount that I found for an lsx car is 86 bucks....where are you getting this $10 tranny mount from?

One sec I'll get the part number for you.. I'll get a pic too.

Yeah I was surprised, it's a really nice piece too, very stiff. I have a NAPA warehouse right up the street for me so they have everything.. IIRC it was like $9 and some change.

NAPA part number is 620-1261 it's even cheaper now, $8.74 shows on the website :)

http://i939.photobucket.com/albums/ad234/Mwernero0/mount348.jpg
http://i939.photobucket.com/albums/ad234/Mwernero0/mount349.jpg

93z383, can you measure the height of the mount from the trans surface to the crossmember surface? I'd like to compare it to the poly mounts. Thanks!

Sorry I can't take a measurement, but I got it put in today and it's great! My rubber mount was cracked and pretty worn, this one totally got rid of all the shifter rattle and noise I was having letting the clutch out shifting to first. I though it was something the previous owner messed up when he put the new clutch in, but it was just a sloppy mount. I'm happy :)

Also put my founders poly LCA's and panhard in, Bilstein shocks and BMR lowering springs. I got both founders pieces brand new for 50 bucks off craigslist :O and pulled the shocks/struts off my 383 car, they are still brand new. Great, great, great improvement.

Just wanted to jump in here. I have the ES trans mount on an M6 and read about all the NVH issues people seemed to have. Before I put it in, I ground the two bumps down on the mount itself, KEPT the preload plate (some people say to throw it away) and installed it. Getting on the highway for the first time and bringing it up to speed, everything rattled--rearview mirror, change in the cupholder, the seat, my teeth. I thought I had something out of balance. I kept driving it and, just like others have said, about 2 weeks later it went away. From my experience and those that have stuck with the polys for a while instead of jumping back to the stock one, the NVH goes away.

If you take the torque arm off the tranny you dont need a poly mount....period.

I don't think poly tranny mounts should be used period.. it's not a part under severe twist like the motor mounts are, it's just a seat for the booty of the transmission. I mean it's going to move a little bit, but to me it's mainly just there to absorb vibration.

I'm a huge poly fan, any part on both my car that can benefit from having poly has got it... sway bar bushings, end links, panhard, lca's, torque arm, ect... never had poly motor mounts yet, but new rubber's have always been fine even on my 383 car.

Just a update. I just called napa and they mount is now $8.47 Im going to go get one today. Great info!!

HI everyone. I just put in a Prothane 7-1909 kit with motor mounts and tranny mount in my 93 T/A auto tranny. The vibration I have is really bad. It vibrates at about 40-50 mph. I don’t know if I should wait to see if the tranny mount has time to soften up or just put the stock one back in. Before with rubber mount I can do like 90 mph without no vibration. Now with this new one it just make the car seem unsafe like the driveshaft is going to break. I can deal with a little vibration but this seems like a little too much. What do you guys think I should do wait a week or two. I drive this car a lot in the nice weather back and forth to work. With this vibration doesn’t seem like a car anyone would want to drive all the time.

http://i939.photobucket.com/albums/ad234/Mwernero0/mount348.jpg
http://i939.photobucket.com/albums/ad234/Mwernero0/mount349.jpg

How's the quality of this piece? Rockauto wants ~$50 for an AC Delco or Anchor piece.

But in the end the OEM rubber style tranny mount is the best bet. I've never killed one and a fresh rubber

My rubber mount was cracked and pretty worn,

Free information on the internet is the best!!

Free information on the internet is the best!!

He's a French model.