Having problems with your 2000 Chevrolet 2500 ?

2000 GMC 2500 4L80E hard shifting after warm up

\015 144,00 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?\015 Posted / edited by AnonymousUser on : 22-04-2019

Answers :

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.
Repair Help & Product Troubleshooting for 2000 Chevrolet 2500

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