42re tranny in my 93 jgc seems to be stuck in low gear. 1st & 2nd seem to be the same and won't shift automatically at all. Will not shift into overdrive. Changed throttle position sensor, new tranny

Hello. It seems your vehicle's transmission has to be rebuilt/replaced. Any automatic transmission that won't 'shift' from 1st gear into 2nd or 3rd gear has a 'worn' slave cylinder that 'slides' gears one way or another. 1st gear works yet 2nd and 3rd don't. Good luck and keep me informed; if you want to.

• A/T or M/T (auto or stick, gee)
• if A/T is this the 42RE box>? are you in DRIVE? or 1 or 2 gear.
• does rpm rise above 3000 rpm > at your attempt? if not ,its a bad engine (weak)
• is the shift linkage even shifting correctly (movement top and bottom)
• check levels yet. (and for pink ./red AFT not black-metal flake
• change the filter yet? or skip service. at 50k miles. ?????
• check all fuses yet>?
• using a basic OBD2 scan tool are there any tranny DTC errors?>
• does the FSM stall test pass? in 1st.? and reverse?
• if stall fails, slips , then tranny bad. if not its really stuck in 1st gear.

The TCM commads the gear change, there is no valve body brain.
the TCM shifts to second with good inputs to the TCM
if the TCM sees bad inputs it will tell you, SCAN IT.

testing the solonoid and sensor isnt a problem ,the solonoid just run a feed wire from battery to it and it should click ,the sensor is another question and would help if i knew what type of sensor it was,i do have a haynes manual but its about as much use as a used tea bag the manual just says consult the dealer --

The shift solenoids, mounted on the front, outside of the transmission, are bad or need cleaning.

-----check possible tps [throttle position sensor ]circuit for damage or faulty sensor----if good check the fuses and trans harness for shorts damage or disconnection,check o2 sensors wiring possible ground to exhaust ,or internal leak 2nd gear apply circuit[servo assembly or 1-2 accumulator] or poor pump pressure

your linkage from the shifter to the transmission is out of ajustment, just tightin it up or loosin it witch ever it needs

\'93 Hyundai Lantra, automatic transmission has trouble changing up from 1st to 2nd, it tends to rev on a bit, clunks once or twice before changing to 2nd, other gears seem to be ok. Oil levels are ok and have recently replaced the transmission oil (yes the correct oil was used)

low on fluid? if not it sounds like your tranny has gone bad.

Try a tranny service change a place that changes the filter the pan gasket and fluid not some of these quick places that just drain a couple quarts out of the tranny lines and thats it that wont help but a complete tranny service should help.

The blinking overdrive button is telling u that a serious fault has occurred in the electronic controls or a mechanical fault such as excess slippage is occurring.