I have a '92 190E with 180k miles. Its 722.4 transmission seems to
have trouble with 1st gear; on takeoff, engine RPMs go way high and the
car very slowly accelerates and then slams into 2nd. All other gears
thereon are fine.
Browsing this newsgroup I found this diagram, from a manual for
722.3/4, indicating which band/clutch is used for which gears. Gear
number in parenthesis like (1) indicates that clutch or band is used
during coasting only.
B2: 1, 2, 3
K1: 3, 4
K2: (1), 4, (R)
others apply to other gears. The problem is I can't figure out what
this "F" component is; all rebuild kits or schematics I can find online
seem to show just the B1-3 and K1-2 friction plates and bands. Any
How does it shift between gears? Does it stays in 2nd, 3rd for quite a while
before last? or does it jump right into 4th?
Your car is supposed to shift from start... 2 then 3 then 4... it does not
start off 1st.
180,000 miles is really the end of life... it is a good life for a tranny.
You can try something... turn the vacuum modulator clockwise for 45 degree
at a time... this shuts down the vacuum and make the tranny engage harder...
hopefully reducing the slippage.
Otherwise, i think your clutchpack seals are leaking bad... causing your
slippage problem. Another possibility is B3 band piston that you can replace
from outside... but the problem is you got no room to replace it... so it
calls for dropping your tranny.... and if you are gonna do that... might as
well put in another tranny.
You should be able to get a rebuilt tranny for about $1200. plus labor to
put it in... labor is about $500 or so.
I don't know exact RPM shift points but the rest of the gears behave
normal-- they get used about equally. The car does start in 1st; this
changed sometime around 89 I think. Older models started in 2nd unless
floored, which engaged a kickdown switch.
I'll try the vacuum adjustment first; if that doesn't help I'll drop it
and attempt a rebuild :)
Thanks for your insights!
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