I posted about 1 1/2 months ago re: no foward or reverse 85 300SD with 115K miles, clean pan, bright red fluid. I have now put in 1st, a rebuilt torq converter and checked the pump tabs were OK - still no movement, and 2nd, now have had the trans rebuilt - still no forward or reverse. I'm doing the installs. I checked the MB tech data book and it says the pressure in drive without moving should be 12.5 bar ~ 185 lbs. The trans shop says it should only be 70 lbs or less. Does anyone know? Anyway it is ~ 40 lbs. Is there anything else I can check? A friend said maybe if the trans oil cooler line is stopped up there won't be much fluid pressure. Does anyone know about that? My flex disk is good. Now with a rebuilt converter and trans I don't know what else to do. The trans does have a 2 year waranty, I just have to take it out again. And yes I checked that the output shaft of the trans is not moving with the car in gear - any gear and yes the shift lever is on and working - won't start except in P and N. I'm calling the trans shop tomorrow. I have called the converter builder and he says that even if the TQ is bad it would move the car and he knows the converter is good because they are checked on a machine before shipment. I really don't know what to do now except take the trans out and back to the rebuilder. Any ideas? Thanks

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K

Page 2, top right corner.

"Drive @ idle = 75-90 psi"

@stall speed, it should be about 185 psi. Stall speed is the rpm at which the converter stalls (ie. the turbine spins at the same speed as the stator)


Before taking the whole thing apart again, I would bump up the modulator and see what happens.

Other than that:

Is the fluid at the correct level?

And did you install everything correctly? - any noises in drive?


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I do not think that the trans depends on the fluid flow through the cooler for proper function... Just cooling.

Attached Files

TransTec-722.3-722.4.pdf (436.0 KB, 132 views)

Thanks for the info. I put in almost 2 gal of dextron lll. The book says it needs 1.93 gal. The stick shows 1/2 way between the 2 marks. There are no driveline noises that I can hear. In any gear the engine revs freely above 3500 rpm - thats as high as I went. And lastly I believe the trans is back in correctly. It slid in to the alignment pins easily, the flex plate bolted to the converter, the cooler lines are on, the shifter is on and working properly, the reverse light wire is on, the P N start connector is on and working - only starts in P and N, vacuum line is on, and flex disk is bolted on. I'm not new at working on cars, just never had a trans problem before. In my youth (60s) I drag raced a 64 FI Corvette and a 650 BSA Hornet motorcycle so I have lots of wrenching - doing engine rebuilds on them and other cars over the years. I'm sure I put the trans back in correctly. Thanks for the attachment and the info on idle pressure.

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85 300 SD ~ 115K
82 500 SEC Euro ??K
78 450SL 164K