144,00 miles. The truck shifts fine initially, then when the transmission warms to 150 deg. and I am in stop and go traffic, it shifts hard into 1st and 2nd. I drove on the highway for an hour yesterday, no problems. When I got off and pulled into local traffic the hard shifting started. OBD II code came up as P1870. Fluid not burned, and I changed the filter a few weeks ago. Same problem persists. Any suggestions?
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.
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Sme thing...anyone have any suggestions?
Other posts on this thread seem to indicate it may be the transmission getting bad data from the engine on shifting modes because of bad engine sensors or the engine being out of tune.
I have the same problem when towing and the transmission gets warm. I'm guessing the towing strains the engine, leading it to spaz out and tell the transmission to overdo on the shifting...
My 2000 safari van started to shift hard 3 weeks ago. The next morning it was fine. Then a week later it happened again. Then it was fine. I had the fluid & filter replaced. Its was very good for a week. Then yesterday it started to shirt hard again, only from 1-2 gear. The mechanic said the code reading said rebuild trans. Another mechanic said it may be a broken spring or a bad solenoid. Now its shifting ok this morning. Any idea?
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