Thoughts on solid trans mounts

Larry_Ratcliff · 01-24-2007, 06:59 PM

I have an issue of to much movement in the transmission under hard acceleration. If I am on it hard through 2nd gear I cant find third when I go to shift. If I let it settle down for 1 second then I can find third with no problem.

I also can run it moderately hard (shifting at around 4500-5K) and I can run through the gears without issue. This is what leads me to believe that there is torque flex that is making it impossible to shift.

My engine and trans mounts are all new but stock. I figure that they are the same mounts that were used for 2.7 through 3.2 engines. Is it possible that they just have to much give for the torque of the 3.6?

I am considering either switching to solid mounts or to the Wevo mounts that have a very small derlin bushing but are mostly solid.

I look forward to responses.

Thanks,
Larry Ratcliff

Tyson Schmidt · 01-24-2007, 09:10 PM

First place to start is the clutch adjustment, and making sure that you don't have other clutch issues such as oil on the friction surfaces, or a disc that is sticking to the input shaft, etc.

And obviously make sure all the shift bushings are in good shape.

If it is from drivetrain movement, then start with the engine mounts, since their wider spacing will offer the most resistance to twist.

Keep the softest mounts for the trans, since it will transfer an ungodly amount of noise. In other words, if you go solid, do it to the engine mounts, and use sport mounts or Wevo's for the trans.

Do not under any circumstances run solid mounts on the trans. Try it if you like, but I guarantee that unless you're stone-deaf, you'll yank them out after a few blocks of driving.

Chocaholic · 01-26-2007, 09:42 AM

Porsche makes sport mounts as mentioned above. I believe they're the same mounts used in Cabriolets. They're firmer than stock, but soft enough to absorb some vibration. I used them on my 3.6 transplant and all is good. Your mileage, of course, may vary.

Britain Smith · 01-26-2007, 09:48 AM

We were having the same issue with drivetrain movement and shifting on our 914 race car. We went with the Wevo Tranny mounts for 914's and saw an improvement in shifting.

-Britain

tonythetarga · 01-26-2007, 10:22 AM

Something else to consider. The rear carrier for the engine flexes and messes the alignment for shifting, particularly into 3rd. When I had my engine and tranny out, my mechanic suggested I weld a stiffener to provide that extra rigidity and make for smoother shifting. He first tried it on a car that had a transplant motor delivering more gusto and it tightened things right up.