So I'm coming back from an errand in my truck and I drop OD on the highway. This is a 1996 GMC C1500 auto. I get off the highway and stop and restart, doesn't help, fluid id fine, no weird smells. It then pops a code (1870-transmission component slipping) and I put some Lucas fluid in it. No change. I think I'm going to a shop since this isn't within my very limited area of skill, but I thought I'd see if there were any thoughts on it from here?
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July 9, 2011 2:13 p.m. mattmacklind SuperDork
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July 9, 2011 3:12 p.m. Ranger50 Dork
P1870 in GM's are typically pressure control solenoid problems. But in 4l60's they are valve body problems. Sonnax's Sure Cure kit addresses the problem.
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July 9, 2011 4:15 p.m. iceracer SuperDork
Change the fluid and filter. Always worth a try. A pint of mystery oil can do wonders for sticky valve bodies.
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July 9, 2011 4:18 p.m. curtis73 Dork
Should be a cheap fix. The OD solenoid sometimes dies and the valve body separator plate gets worn and the OD check ball gets stuck in it. The $2 Sonnax kit comes with a little grommet that you put in the worn hole which is great if the hole isn't too bad. If the hole is mushroomed, just spend the $15 and buy a new separator plate.
