ok, im kinda green with tranny problems as Ive never had any before but the car shifts fine in all gears and the tourqe converter locks up in third.
however when im on the highway im in OD at like 3000rpm and If I give the car any gas the revs shoot up to over 4000rpm before I start making anymore power again and then its still not transfering the power correctly. I think this is "slipping" but not sure. If im in D3 I dont get the problem as 4th is locked out. Dunno whats going on here. Had the tranny flushed and filled today and the shifts on 1,2,3 cleaned up nicely but 4th still has this issue. Fluid looked good and no metal on the magnet as I asked to see it. Can I just drive around in D as opposed to OD to prolong life as I hate to see my valvetrain taching out at over 4k on the highway for long periods of time. Is my tranny gonna die? or am I just never gonna get full use of 4th gear? I added the Lucas magic oil stuff today too. whats going on? burnt clutch pack or whatever? what does it take to fix it short of a full rebuild?
Car is a 1990 Turbo grand prix with 130,000 miles and 40,000+ miles on a rebuilt tranny.
minor correction, it still occasionally shifts late going into third gear, but rare and not very severe. all other shifts are good if not great.