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Old 02-23-2008, 04:09 AM
Registered User
Join Date: Feb 2008
Posts: 49
transmission problems

Car, 1981 300SD..

Ok so I changed the fluid and filter and took out the B2 piston to have a look. The B2 piston looked perfect, the fluid had lots of fine metal flakes in it stuck to the pan, and the filter also had fine metal flakes.

And the results are that trans problems are still present.

Here are the symptoms:

Car very quickly goes into drive or reverse (no delay, good)

accelerating from a stop in drive it seems like the car is starting out in second gear, and then at about 25-30 MPH it seems to shift back into first, of course the car is basically coasting at that point, and when it looses enough speed it goes back into second. If I push it up to about 4K rpm being careful not to over rev I feel it start to engage again.

If I start in "S" behavior is exactly the same as drive.

If I start in L, it seems to behave as it should, car stays in gear the whole time I think second gear?

What else can I look at before I start looking for a used trans?
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Old 02-23-2008, 10:08 AM
Registered User
Join Date: Feb 2008
Posts: 49
One more thing, it is making some noise, similar to a bad PS pump, only after 25 when it starts to slip.
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Old 02-23-2008, 11:28 AM
Admiral-Third World Fleet
Join Date: Feb 2002
Location: Central FL
Posts: 3,068
if the fine metal flakes are magnetic, you definately got problems. Could be the front pump getting chewed up, maybe some mung in the valve body causing the erratic shifting. Better look for another one, but it would be interesting to dig into this one and see what's up with it.
80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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