I recently bought this 1982 300d turbo. When I bought it I knew there was an issue with the transmission and on the way home the odometer was about 10% off the whole way meaning to go 75 I had to be going nearly 85 on the speedometer. he tires are the right size, I checked 195's. the transmission had been replaced.

Anyhow 10 miles from home after 470 miles fourth gear dies the car shifts in to 3rd an that dies and I soon loose second...I limped it home in first.

my questions are

#1, Is it possiblethat when the transmission was exchanged they put thw wrong transmission in it like on geared for a less powerful vehical?

# 2 How do I check to see if the correct transmission is in the car now? I certainly don't want to repair the wrong transmission.

# 3, Is it possible to repair this transmission and change the rear end gears to suit it so i don''t end up with all the revs any more once i am on the road again.

Thanks for reading this far and I hope someone has the answers to my questions?

I would probably think about a used transmission from a salvage yard if yours is really toast. How was the fluid level? I think several different years fit your car so finding a good transmission should not be too hard. You probably can swap out the tranmission in a day.

The trans has NOTHING to do with speedo calibration. that is done by the differential to speedo selection.

The MB auto transmissions all had a 1/1 final gear ratio until the 1990 300SL came out, no overdrives.

THERE should be a stamped-in number on the passenger side of the trans case just above the trans oil pan.

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thanks very much for the input knowing the final drive ratio is very helpful to me in this whole thing... I read the thread " 'Well - I have found the MB diesel "easter egg" " and while I found it was not an easter egg I did find out more about gear ratios than I thought possible. It seems now that the rear end gears must have been swaped out at some point by a prior owner... The thing was like a rocket at a light without even meaning for it to be.

How much might I expect to pay for a junk yard tranny? The guy who sold it to me has offered to send one for the cost of shiping from delaware to western ny if he can put his hands on one so I am curious as to what will cost more buying one here or shipping one here.

i have changed transmissions before so i am hopeing this will be a simaler experiance.

looks like 400-550 in NY.
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