Read through all these and my problem seems just a little different, but maybe we are just explaining it different so I wanted to post here.
I actually just got a 94 K1500, my first gmt400. When I drive normally everything seems to shift and drive mostly fine, sometimes hard shift but seems fine for older truck maybe. But, if I have to give it a big bit of gas (not fully WOT) it will seem to hit a false when it should shift up between gears. If I let off it will then shift and go into gear, sometimes clanking hard. Also, If I am at hwy speed and need to pass, it again looses power or a false neutral, right when it should be shifting down to get a lower gear for some passing speed. Transfluid looks really good actually, lots red so looks pretty fresh. The truck does have 265K and I don't know any history of it other than it was a one owner vehicle and it seems like it was owned by a guy who would have taken care of it, not thrashed by any means, some upgraded motor parts. Any ideas? I hope it is not just old and slowing going out, but I guess it could be. Maybe TPS if I am lucky? Other?
I actually just got a 94 K1500, my first gmt400. When I drive normally everything seems to shift and drive mostly fine, sometimes hard shift but seems fine for older truck maybe. But, if I have to give it a big bit of gas (not fully WOT) it will seem to hit a false when it should shift up between gears. If I let off it will then shift and go into gear, sometimes clanking hard. Also, If I am at hwy speed and need to pass, it again looses power or a false neutral, right when it should be shifting down to get a lower gear for some passing speed. Transfluid looks really good actually, lots red so looks pretty fresh. The truck does have 265K and I don't know any history of it other than it was a one owner vehicle and it seems like it was owned by a guy who would have taken care of it, not thrashed by any means, some upgraded motor parts. Any ideas? I hope it is not just old and slowing going out, but I guess it could be. Maybe TPS if I am lucky? Other?