'90 190E 2.6 trans problem

[samdon]

I have done an exhaustive search and find many references to 722.4 issues but most are for governor gear failures and lack of shifting between gears.

Mine seems to go into gear when I move the lever to Drive or Reverse but when I open the throttle it will rev for a second or two then jump forward. After that, it shifts perfectly. I've checked the fluid level per the manual and even went so far as to replace the filter and fluid. Same thing after the service. It seems to pull very, very weakly then catches fully and moves forward with normal power.

It seems to be getting progressively worse and I fear it will fail soon. Does this trans have the B2 piston which so often fails causing such issues or should I look elsewhere?

This is my wife's daily driver so I need to ensure its reliability as much as possible as soon as possible.

Sidenote: Similar symptoms struck our other 190E 2.6 about two years ago and I simply replaced the trans with a rebuild from Sun Valley. I would prefer to bypass that labor and just repair this one if possible.

Many thanks for your expertise and assistance.

[mbdoc]

Most likely a B2 band adjustment issue. I would start there & check the adjustment.

[samdon]

I'll crawl under tonight and see what I can see.

[samdon]

I'll admit near complete ignorance with this tranny even though I've R&R'd one in the past. My W123 had the B2 piston breakage syndrome and that was an easy job but I didn't notice any adjustment possibilities. The discus shaped cover on the right of the 190 gearbox looks the same as the 123 to me. Where might I locate the adjustment procedure? Since it's a pre-'94 should I go ahead and replace the B2 piston with the latest redesign?

I don't mind spending some time on this thing but spending a lot of money doesn't excite me in the least. If it needs a replacement tranny; I'll part it out and get the Wife a later W123 diesel which I'm more comfortable working on. I'd like to fix it, though. Any assistance would be appreciated.