Need some advice with my R129 500SL

  • Thread starter Thread starter KING Of ROCK
  • 3 comments
  • 1,431 views
K

KING Of ROCK

Messages
53
Hello, I have a 1991 500SL that comes with a 4 gear hydraulic auto transmission with a standard second gear start.
Under full throttle the transmission downshifts to 1st gear and stays until redline then it upshifts to 2nd and then upshifts pre-maturely again to third. It's like 2nd gear is almost skipped, it's a very swift upshift from 2nd to 3rd that the engine takes time in order to cover the missed out power/speed needed to be acheived in 2nd before upshifting to 3rd.

Also when in 1st gear and under full throttle, the engine's revving sounds louder than the actual acceleration rate of the car.

Oh and I'd like to add that occasionally the gears won't change when shifting from D to 3,2,B. unless shifted back and forth again from D to B (which is 1st gear).

What can I do to fix this problem?
 
i assume you have the R129.

should have the venerable 722.3/4 transmission. tough tranny. which likes its oil changed.


regular oil and filter changes. and i dont mean the engine.
start there.
 
Yeah it's the R129 as mentioned and yes it's the Hydraulic 722.3 4 speed auto tranny with standard second gear start.
I tried some different sites and most people recommended a full transmission service, just wanted to see your opinions here.
 

Latest Posts

Back