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Driveline knocking increases after new mount - why? 200 1993

posted by  woodshavings on  Sun Jan 19 22:50 CST 2014
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last visit: Fri Oct 24 08:22 CST 2014
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The 93 245 has had a knocking noise when reversing up a hill (i.e. under a load). It is directly proportional to the wheel speed. The sound seems to originate between the two front seats. I don't reverse up a hill much, so I really have not paid too much attention.

Well, I had some free time this weekend and inspected the propeller shaft area. No signs of contact or rubbing. The shifter linkage looks free and clear as well. However, the tranny mount was a bit squashed, so I replaced it with a Volvo OEM mount. I had to lift the tranny about a 1/4" to make the holes line up.

Now the car knocks/grinds in every gear, including park. It dissipates at speed (over 10-20 MPH and that's as fast as I've taken it.), but is constant when stopped in Park/R/N/D. When in neutral, if I rev the engine, there is something out of balance that causes a vibration I've heard/felt before.

I put the 245 back on jack stands with all wheels off the ground, started it up, ran it through the gears and no noises at all, including the rev in neutral. Sounds great. Damn!

I closely inspected the propeller shaft area again and there are no signs it's hitting anything at all.

I find it odd that my symptoms only got more persistent when I put a new tranny mount in which raised the rear end of the tranny a bit.

The motor mounts are Volvo OEM and brand new as well. Everything looks tight.

I plan to check the linkage adjustment in the morning. If that does not work, what other experiments can I try?

Do I have a bad torque converter? How do I inspect it?

Thanks for any pointers.






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