The auto gear not changing properly, but gets hook at gear 2

Is it an auto it sounds like the kick down switch usnt working there normally behind yhe accelerator pedal i think never had an auto merc been all manual

run the fault codes
could be the vacuum actuator , TCM or ECM
take it to a specialist auto transmission shop for a proper diagnosis and quote

When you rev the engine and does not go over 3000 rpm is this in neutral or when driving in gear? Some vehicles have a rev limiter to not allow rpm over certain point when in neutral gear but is typically not limited when driving vehicle. This sounds like a very low rev limit but not abnormal if you can get engine to rev higher when driving. You call a drifter so truck must be non US market. Is this engine a 2.5 liter diesel 4 cylinder motor. Might just be your top rev and speed if this is the case.

kick down cable not rusted stuck fully out and TH thinks you are passing other cars WOT?
no engine told, of 4 offered day1 new. even a diesel.
1989 oem stock THM-400? NO./

4.3L guessed
full trans code is 1989 !
THM700-R4/4L60/MD8 (4 speed is stock)
TH400 is 3speed not 4. ,now called 3L80 and ended in 1979 ,

but is really 1989 1971-1994 3L80HD (heavy duty version of TH400)<< yes


i just looked in the service manual
it shows this box THM 700R4 transmission. or TH400/3L80HD
and shows
Throttle Valve (TV) or Detent Cable one must not lose vacuum to the modulator of the transmission see 100% engine overload, and wants to use lower gears, so the vacuum must be there
and MOD is color coded, and must not be ignored, it must match the weight of the car or it will not shift correctly. Do not use the wrong MOD ever.

this is not a 4L80E/3L80E box no electric shifts. yes TCC lockup. sure.
TCC relay is ECM controlled. clutch main TC lockup. acts like gear 3.5.


A tuneup does not effect THM turbo hydra matic. box.
unless huge engine power loss subsequent vacuum now wrong.
the box shift, itself.
only mod and TV cable and full engine power,changes it and for sure
the GOVERNOR.

Look in owners manual for trany diagnostics. should press buttons to go into it.

May not be getting enough fuel to the engine

Acutally there is 3 position settings for the transmission selector, the power setting which changes the shift points higher ,more rpm's, center position basic auto selection the transmission selects the best driving gears based on your habits, and the comfort mode which shifts the transmission easily and smoothly, no high rev shifts, best for good fuel mileage, but if you need to get on it it will go.

You could have a bad valvebody in your transmission or a bad pump in your transmission or your clutches are bad. In any case you have a bad transmission. Please rate my answer.

their is a problem in ur gear shaft ,get it changed

depends on gear ratio and wheel size ..but rule of thumb from what i seen in cars and trucks on the freeway at cruising 80 mph in a manual 5 speed you will run around 4000 rpm in an automatic around 3000 its the way they are designed the gear ratios..