Automatic Transmission slips badly at take off. - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 02-18-2013, 08:36 AM Thread Starter
BenzWorld Newbie
Date registered: May 2011
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Automatic Transmission slips badly at take off.

New member here and glad I found you guys!

My car is a 1989 Porsche 928 S4 with a MB automatic transmission.

Have had the trans and TT out for need TT bearings and Torque converter bearings. I also resealed the trans pump while I was there. After first reinstall the trans slipped at take off but at higher speeds did well and reverse was great. Removed the second time and I took trans to a shop and THEY RESEALED the pump as I had damaged one of the seals when I did it. I reinstalled the trans today ( second time ) and the same problem is there...if not worse.

I am doing a lot of readings and it sounds like this is what happens when the B2 piston goes. Could this be bad timing as I had NO issue before I resealed the first time. ( I always look at what I FIXED LAST ) I KNOW the fluid level is good. Will take it in tomorrow to check pressure at modulater.

Any input would be helpful as I am at a loss and not sure anyone around here knows anything about this car.

Attached is a video where I am tryng to drive up the steep driveway from stop and it FINALLY makes it but it takes awhile.

If it is the B2 piston...where can I find the parts numbers I need? The passenger side case lip at pan reads 722 270 32 01. Where to order from?

Thanks in advance.
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