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speedyblue 11-19-2010 11:59 AM

Group-N transmission mount post install ?s
I installed the GroupN transmission mount and upgraded cross member bushing last night. I drove my GT Wagon to work today. I have a few questions for those with upgraded transmission mounts
1. Taking off from a slight incline.. the car pulled a bit to the right. It almost felt like torque steer. I will say that I had to jimmy the transmission to get the bolt holes lined up when putting the cross member back in. Anyone experience this?

2. The car kinda sounds like.. umm.. a tank now. I expected some NVH.. but I sorta feel like I'm in a diesel now. Wondering if this is normal or if I f'ed up the install somehow (I had to jack the transmission around several times to get the cross member re-installed). I know I was supposed to support the tranny with the jack the whole time.. and I thought I was.. but the jack had come loose between the time I removed the crossmember and when i first started to put it back.

I will say that clutch response is great now. No more slop outta first. It sorta feels like when I added a torque dampener to my departed RSX-S.

If anyone else wants to add their impressions of the GroupN trans mount.. please do. I'm interested in first and long term impressions.


km580 11-19-2010 12:27 PM

I have the Group N mount as well as all Kartboy shifter bushings, There is more noise with it, don't forget your midpipe is bolted to your trans. which will give you alot more NVH, I have no cats on my car so it's very loud inside. I tried leaving the midpipe unbolted from the trans but it moved around too much but it did make a diff. for NVH. But I do like how nice and tight the car feels now. I also have the Group N pitch stop mount which contributed to NVH but again, it's the price we pay to play.

GTTuner 11-19-2010 12:39 PM

I have the mount only. Driveability is 100% better. NVH increase was alarming, the whole car is noisier. I just crank my radio up. :)

speedyblue 11-19-2010 12:58 PM


Originally Posted by GTTuner (Post 3174169)
I have the mount only. Driveability is 100% better. NVH increase was alarming, the whole car is noisier. I just crank my radio up. :)

Alarming! That is a great way to describe my experience. I turned the car on and it sounded sorta like a NASCAR stock car. Not that I've ever been in one.. but compared to the very quiet.. not sure the engine is on.. Legacy it was a real surprise.

Anyone else have any issues... how about more impressions? Yes I am car hypochondriac.


zavar 11-20-2010 12:48 AM

Wow. I was just about to order the same parts when I saw this, I'd like to get the shifting a little crisper, but with some of these NVH comments, not sure if I'm willing to sacrifice things that much.

I was under the impression that NVH would go up, but that it wasn't very drastic.

Th3Franz 11-20-2010 09:40 AM

It takes a little getting used to, but overall I'm happy with the mounts. Shifting is much more precise which is what I wanted. And, I kind of enjoy a more direct connection to what the engine is doing.

BoozeRS05 11-20-2010 09:52 AM

I have a GroupN tranny mount sitting in a box for install, been a bit concerned about NVH myself.. Might flip it for a STi tranny mount somehow..

zavar 11-20-2010 01:25 PM

Is the STi one less "stiff" than the GroupN one?

BAC5.2 11-20-2010 01:27 PM

I have a group-n mount sitting in a box waiting to go in. I'm not too concerned about the NVH increase, and less so because I hope to fully sound-insulate the car in the summer.

Th3Franz 11-22-2010 09:29 AM

Correct the GroupN mount is stiffer than a STi mount.

Call me crazy but I think the mounts are breaking in a bit. Temps were in the 50's yesterday and I barely noticed the NVH with the stereo off.

GTTuner 11-22-2010 09:43 AM

I plan on "reworking" my OE mount like I did to my LCA bushings. Like I said, I love what the mount did for driveability. I don't want to go back to that mush mount.

speedyblue 11-22-2010 08:49 PM

Now that it has been a few days... I am really digging the upgraded tranny mount and bushings. They have quieted down a bit (or I'm used to the new sound) and I barely get any vibes at idle. I love the directness to the shifting.. and downshifting is actually fun now instead of a chore. Here are some install tips when doing the mount:
1. Wear mechanics gloves. I turned my hands to burger on the crossmember. That thing was sharp!
2. Keep your tranny supported. Not having it properly supported killed my install time.
3. PB Blaster on all the nuts/bolts you are taking off. Made it real easy to get those 17mm bolts off.
4. Eye protection for all the dirt and crap that will be falling in your face.

Have fun!

scoobycoupe 02-08-2013 01:21 PM

revival time, what would any of your thoughts be on taking the group N mount and drilling a few holes through the middle of the rubber to soften it up a bit and give it a little flex.

I want to go stiffer but I hate the thought of making my legacy vibrate and rattle like my impreza :nono:

cheeseburger 02-12-2013 04:05 PM

It would be better for a vibration standpoint but I wouldn't. Putting holes in any structure, especially one that is an integral part of your car's structure is a bad idea as it introduces localized stress concentrations that could cause it to fail prematurely. If you're concerned with the added NVH I would just stay away from the Group N and get an STI mount.

P.S.- If anyone's got cold feet, I'd be willing to snatch a group n mount off your hands!

SSpeed 02-15-2013 08:28 AM

Did you replace the dogbone as well? I've heard that's what causes the extra NVH.

I replaced both engine and tranny with GroupN and didn't notice any extra NVH. I have stock mufflers so any extra NVH would really stand out.

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