The explanation here is from when I drove the car around today without the vacuum line hooked up to the trans.

When the throttle is all the way on the floor, or I am barely hitting it, it reacts fine. When I have the throttle in the middle, the trans slips all the way through 2nd and 3rd. I can feel it slam into gear, but the rpm doesn't change and the car is still speeding up.

I don't know much about transmissions, but I am pretty sure this one is toast. Any thoughts?

__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior

With vacuum out the the picture, doesn't sound good.

How many miles on this transmission?

Did this poor performance happen suddenly or has it been failing gradually?

Is the fluid level correct, Is the filter clean?

Rick

__________________
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 (??)

I replaced the filter and put synthetic fluid in there about 4 months ago. I checked the fluid level and verified it was good once I started having the problem. There was also no debris on the dipstick when I checked it.

There are about 100k mi on the trans.

I started having the problem when I realized and fixed the problem with my overboost sensor. The problem started immediately with the added power from a properly working turbo system.

I know there are a lot of tricks to this transmission, so I wanted to get confirmation before spending the cash to replace it. Thanks for the help.

__________________
My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior