1992 C1500 with the 4L60 (not 4L60E) here. So the deal is I am already easily nauseated (especially after a cigar) and let me tell you when I throw the truck in drive or reverse it slams into gear so hard my stomach may go out the window. Also this week I just lost my 1-2 shift, or at least it's very delayed like I have to get up to 30 mph and the engine redlines then finally shifts into 2nd. Beyond 2nd it shifts OK from what I can tell especially under highway acceleration. I have not gotten around to testing the TPS but that is what I suspect is the culprit because I have dealt with hesitation/acceleration problems with my truck in the past.
Not sure if this helps but I did change the fluid & filter about a year ago. Look at the color - nice and pink but there's always this black residue on the dipstick, ever since I bought the truck. Very strange. I will say when I bought it it shifted like butter all around but ever since I did the fluid change (and snugged up some loose valve body bolts) I have been getting crisper than desirable shifts mainly from 1-2 as I stated. Is it possible I overtightened them? Or that the black stuff in the fluid is an indication the previous owner put in fresh fluid to mask a problem just to get rid of the thing?
It's also very weird that some of the ATF (see pic above) came out more of a burnt color while the majority came out pink. (The old/burnt color is what it was entirely before I changed the fluid)
Not sure if this helps but I did change the fluid & filter about a year ago. Look at the color - nice and pink but there's always this black residue on the dipstick, ever since I bought the truck. Very strange. I will say when I bought it it shifted like butter all around but ever since I did the fluid change (and snugged up some loose valve body bolts) I have been getting crisper than desirable shifts mainly from 1-2 as I stated. Is it possible I overtightened them? Or that the black stuff in the fluid is an indication the previous owner put in fresh fluid to mask a problem just to get rid of the thing?
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It's also very weird that some of the ATF (see pic above) came out more of a burnt color while the majority came out pink. (The old/burnt color is what it was entirely before I changed the fluid)