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The Gears

12-23-2010 03:33 AM

New Trani Problem

In my 84 300SD the shifting is very smooth in alll gears during normal driving but when shifting from 3 to 4 with light throttle and low speed there is a thump. I feel this is not doing the drive train any good.
Have any of you experienced this problem.
Thanks

mbdoc

12-23-2010 08:19 AM

Most likely caused by a slight vacuum loss at the vacuum control valve OR vacuum valve for EGR leaking.

The Gears

12-27-2010 02:33 AM

Thanks Doc. The line on the vacuum control was cracked underneath and out of sight, just old I guess. I replaced the hose and the 3 - 4 shift smoothed out. Love it when there is an easy fix.

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