PeachParts Mercedes-Benz Forum - View Single Post

dpetryk · #2 12-08-2001, 06:50 AM

I am in the process of overhauling the tranny from my 87 420sel. Yes you are right, there is simple modification that forces the tranny to start out in first. I dont have the book in front of me at the moment but it seems like removing a check ball in the valve body is all it takes. The valve body is easy to remove, I would estimate 30 minutes max.

The delayed upshift might be corrected by adjusting the bowden cable and or modulator pressure. However I did notice that my tranny had a small component that compensated for temperature. Exacty how and what, im not sure - just that it cought my attention. I think your tranny is very similar to mine so the same things probably apply.

Your abrupt shift into and out of 1st could be normal depending on your foot. If you hit it hard from a stop and hold the throttle down, it will stay in first longer. However if you let off even a little bit it usually shifts into second. So if you want first, push hard and hold it. Many times if it goes into first, I find myself letting up just a bit and then it jumps into second. Too bad it cant read my mind.

Let me know if you need more info about the internals of the tranny. See if you can get the tranny number. Something like 722.4xx.