Transmission slip on a 68' 250sl.

[swampfox676]

Hey all,
    I recently started driving my 250sl after having the engine rebuilt.  When I first drove it, the transmission clunked on 1st and 2nd gear.  Next morning when I tried driving the car, the transmission started slipping out of gear with any acceleration.  My transmission fluid I discovered was low because the fluid was blowing out of the top of the transmission pump.  I replaced the pump wing nut, which gave me a proper seal.  I then refilled the transmission fluid while hot.  Fluid level is wear it should be and my transmission is still slipping. Please help.  
Thanks,
Sam

[ja17]

Good advice, yes, make sure that the engine is running and the car is on level ground when you check the transmission fluid level.

[rwmastel]

.... because the fluid was blowing out of the top of the transmission pump.

I don't believe there is a "transmission pump".

I replaced the pump wing nut, which gave me a proper seal.

As "fosdicke" said, you may be dealing with the power steering fluid reservoir.  It has a wing nut on top, is round, and is located near the distributor.

I then refilled the transmission fluid while hot.

If you're putting transmission fluid in your power steering fluid reservoir, you may be causing other problems.

[swampfox676]

Thanks rwmastel,

      I was putting tranny fluid in the power steering reservoir.  I haven't been able to run the car, but I think you solved my problem.  I'm gonna refill my fluids.  I'll keep you posted.  Thanks again for your help.

Sam

[stickandrudderman]

If you're putting transmission fluid in your power steering fluid reservoir, you may be causing other problems.

Not at all, they're the same fluid.