[afroney]

Hey again, got that 82 300D. A bit a go I noticed that the transmission was making this loud clunk when stopping at a intersection. When it clunked the car would slow down before the clunk and lunge forward after the clunk. I read in my shop manual that this could be caused by worn Flex splines/plates in the drive train. I could also need a transmission fluid change. Any particular type of fluid work best? The transmission is orginal never rebuilt, and has well over 300k miles on it, although it shifts flawlessly in any other gear including that infamous 1-2 shift Any suggestions

 

[Greg S.]

Check the transmission and engine mounts for wear.
...

Check the transmission and engine mounts for wear.

 

[Ian P.]

Kerlunk...!

Check all the mounts as suggested and the drive shaft couplings.
Also have agood look at the differential mounts. But I would bet the front flex plate.
Easy to change yourself if you don't mind laying down on the job.