Herman K

A simple way to extend the life of transmission mounts is...

cut the right length of (I used PVC coated hose for oil resistance) hose and used a vise to drive into the collapsed space.

It may not be the purist method of choice but if there is better less expensive way I'll stand corrected

Captain_Slow

That's a great idea when you don't have an old set of mounts laying around. But now that I do, when I have a need to extend the life of the new mounts I just installed, I will cut out blocks of the hard rubber from the old mounts and insert them same as you have shown. I got this idea from someone else in the forum.

Bertrand Daoust

I believe that when Porsche designed there mounts, they left an open space for some reason.

If you fill that space, it may keep everything a bit higher but it won't move like it should and absorb vibration as well.

I think that space is crucial for smooth, perfect operation.

the flyin' scotsman

Interesting concept Hman..........the guys over on the Cayenne forum do essentially the same fix for the driveline bearing carrier( they all fail after time/miles).....very creative repair which overtime may prove to be a longterm fix.

geschwindig

Nice write up, Jon. I did mine a year ago and had a similar easy install once I got the wrenches figured out. Herman, I did a brace job on my mounts, too, to make sure the tranny doesn't end up metal to metal again. I used rubber from some spare exhaust hangers I had on the shelf and used small set screws to keep them from falling out from the vibration. I agree with Bertrand, the space probably provides for less possibility of vibration getting to the frame, and my fix is just an experiment. Smooth, so far. Will re-evaluate in a few years. There is a pic of my mod in this thread:

https://rennlist.com/forums/928-foru...ans-mount.html

Captain_Slow

geschwindig - That is an awesome looking plug fix. I'm sure there were deliberate reasons for making the mounts with the Y design. It likely behaves like a suspension, not just a rubber bushing. But how many vehicles have solid mounts? Probably a lot. I think what you did would work fine How many miles on them?

Herman K

I still had a set of new ones that I installed on the GTS about 2 years ago

These were done to support mounts on an S4 that were not worn out but the gap above the transaxle was questionable so we are going to try them out and we'll see.

Some owners use solid mounts for the engine with good results this method still leaves some flexible space and tranny mounts are easy to drop in so there's not much time or $ lost if we don't get the desired results.

We figured we just share what may be an easy fix

Captain_Slow

Oops... I meant solid rubber mounts (which is pretty much what you and geschwindig have created).

xschop

I was going to make some poly bushing mounts for my old 5speed, but found that a simple 60A poly fill worked perfect just like the civic engine mounts mod. The product I used was Econ60. The more solid the mounts are made/designed the more gear noise is transmitted.

FredR

I have wonderd if one can breath some fresh life into these things by filling the void with some silicone RTV [non hardening] sealing compound- I reckon a tube per mount would be required. When this stuff goes off it leaves a pliable compound that would [I suspect] be good for dampening vibrations.

Just a thought at the moment but given I suspect my auto box mounts are on borrowed time and the cost to replace them, might worth a go.

Regards

Fred