Transaxle Mount Urethane "Upgrade"

Ryan Holcombe

Dec 20, 2023 — 2 min read

I pulled the transaxle with plans to reseal it. There is quite a bit of oil and sludge all around it. The mounts didn't look bad, but the rubber is about 40 years old at this point. I read on Rennlist a few posts where folks are adding urethane to the mounts to help stiffen them. This helps reduce movement in the transaxle, providing better shifting.

I ordered some inexpensive urethane off Amazon. It has a Shore A rating of 55 which means it's still flexible, but should add plenty of support. Using urethane all the way up to 80 should be just fine. Here's a chart showing the various hardness levels.

I taped the mounts so contain the urethane.

I then applied the urethane using a standard caulk gun. Here's a link to the product: https://amzn.com/dp/B000RW1XCK

After it cured, it turned out really nice. The urethane is supportive, but still flexible. I am no longer able to move the middle mount section as easily as I was before.

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CV Axle Rebuild/Regrease

Engine Disassembly

Engine Cleaning

Engine Transfer