1994 s10 tahoe blazer.Transmission problems

check fluid level in transmission. have a pressure test done on the transmission to test for internal failures ---pumps---band pistons and clutch packs seals

It really sounds like a tranny problem, best addressed by a Transmission shop. It might be an easy fix, or a really expensive one.

Sounds like your transmission is in limp mode. This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

The other from what you described, trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Thank you for using fixya and have your Safari scanned for the DTC codes that would indicate what issues your transmission is having to put you in to limp mode.

This is a sensor issue. It can be from a couple of different sensors. The VSS, or vehicle speed sensor is the main one. Loose or faulty wiring can cause it, a faulty PCM can cause it, or the Throttle Position Sensor can cause it.

I believe you have a 4l60e transmission.Do you have a chck engine light? The unit may have a 3-2 downshift solenoid going bad or a possible band ''servo'' leaking. The band applies in 2nd and 4th.You may also have a shift solenoid starting to malfnction......Best

if it has a vacuum there's a crack in your line or it came off, if there's no vacuum, it's probably in the wiring or just a bad tranny. if it's electric, double check the plug connections

theres a shift cable if its floor model,linkage for column model.

check your flywheel or check your gear rate.

Have the transmission governor checked

IT IS NOT GOING INTO NEUTRAL. IT HAS LOST THE DIRECT DRIVE CLUTCH PACK INTERNALLY. SOUNDS LIKE IT IS HIGH MILEAGE. IF SO AND YOU CHANGE THE FLUID IT CLEANS UP ALL THE VARNISH IN THE TRANNY AND THE END RESULT IS TRANNY MALFUNCTIONS DEPENDING ON WHAT KIND OF CARE IT HAS HAD IN THE PAST.