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Old 12-10-2009, 04:13 PM
tr1cky tr1cky is offline
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Join Date: Sep 2006
Posts: 298
Quote:
Originally Posted by Brian Carlton View Post
While it could be an issue in the diff, the most likely cause of clunking is insufficient.........or non-existent...........vacuum to the modulator.

You'll need a vacuum gauge and you'll need to T it into the modulator line (the line to the transmission) and put the gauge in the cabin so that you can watch the gauge while you drive it. My suspicion is that your gauge will read zero or very close to zero under all conditions.
Prior to the transmission swap I went through various vacuum diagnostics and at that time showed that there was adequate vacuum at the modulator. The original modulator in the old transmission was not holding vacuum and the pin behind it was broken.

I will check vacuum at the modulator again to be safe.

Thanks for the thoughts here.
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