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Mar 5, 2011 - Before guessing at transmission problems, check the fluid level (car warmed up, ... that do not show up as PCM codes (like shift A&B solenoid failures, for example). ... 1-2 shift is delayed and harsh, may not shift into OD: Check TPS for ...goes into 3rd gear: Reaction planetary is worn out due to high miles or ...
It sounds to me like the transmission is starting to fail. As the clutches inside the transmission wear the clutch pack gains additional clearance. Your pressures in the transmission will be higher with cold oil so it has a tendency to build a bit of extra pressure, but it's also slower in flowing through the transmission. This results in a harder hitting first gear. As the transmission warms up, it will reduce the viscosity of the oil and work fine. Cold weather kills automatic transmissions. Let it warm up before driving it or it won't last long. It will require an overhaul soon.
My solution would be to recommend a transmission stabilizer additive. Lucas Oil makes a transmission stabilizer. The cost is about $12. Be sure to read the instructions...you need to warm the motor and ******...add through the transmission dipstick fill tube. This additive can work better than a fluid and filter change...depending on your mileage, many mechanics do not recommend opening the transmission pan to drain and replace fluid, and filter. This additive is the best one that I have used. It works to reseal and lubricate your transmission seals, and bands. Hope this helps.
I had a 1995 with the same problem... perfect when cold... slams the gears when warm. I had to have it overhauled. I got by for a long while by up ******* manually, releasing gas pedal just before each shift.
FYI I have a 1995 GMC 1500 with 5.7 truck that the ABS Light comes on
and then the tranny starts jumping gears and speedo goes crazy-
Changed ignition switch and that did not help. You said that you had changed the speed sensor on the tranny and that did not help ?? If so that was my next step. Let me know if you find and answer and I will do likewise.
1st and 2nd shift solenoids has sediment causing them to stick.or you got damage leaking seals. it might help if you put a little transmedic in transmission dont over fill. if your valve body full of sediment it causing valve in valve body to stick.this might help still might have to go in transmission.
I have the same problem with my 97.... especially shifting from 3rd to O/D... I've had the tranny serviced and flushed.... It still does it until the tranny warms up.... the tranny's in them are temperature picky!!!!! It's the nature of the beast!!! Wait until spring and everything will be good until next winter!!! If you're really concerned with it you can put a "cold front" on it or block half (NO MORE THAN HALF) of the tranny cooler with cardboard thru the winter months