A while back, I ended up blowing the transmission pump. Since the car has over 200K on it, we decided to rebuild the transmission. Everything went fine until the test drive. It would not upshift. We found that by quickly 'bumping' it into neutral and back into drive, it would upshift. Funny thing is that when you slow up and it downshifts, as long as you do not stop, it will then upshift.
We have had numerous people look at this and are at a loss. Any help would be greatful !!

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100

When you say rebuild the transmission - what do you mean? Did you strip the entire transmission and replace all of the seals and worn parts and then reassemble everything following the strict instructions in the FSM making the appropriate measurements all the way?

When you installed the transmission did you make any (hydraulic or vacuum) measurements?

I assume when you say it won't upshift you mean it is stuck in first gear? In which case I'd be looking at the B1 system - either brake band or valve body control...

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

The entire transmission was rebuilt. It will 'bump' shift upwards for all gears and as long as you don't fully stop, it will downshift and then upshift normally.

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100