No forward movement in OD or D, but L2, L1 and R work: Forward sprag is broken. R&R. Try not to run or drive the car or further damage could result.
No movement in any gear: pump failure, or total loss of fluid.
R&R, or refill pan and find the leak. If out of fluid, avoid
running the engine until the trans is refilled to avoid pump damage. To
check for pump failure, check fluid level with the engine off, then
start the engine and recheck fluid level. If level does not go down
when engine is running, the pump is broken.
Fluid leak out of the front of trans where the converter connects; partial or full loss of movement:
Front pump bushing walked out. R&R. May have to replace converter
also if hub is scored. Note that a leaking front seal usually means the
bushing is walking out (i.e. call your local trans shop and schedule an
appt.).
Soft shifting, gradual performance degradation: Poor line
pressure rise due to leaking boost valve, clogged EPC filter screen,
failing EPC solenoid, or worst case: leaky seals throughout. Transgo
HD2-C kit fixes first two without removing trans. Seal restorer may fix
last problem, but probably R&R. Also try a transmission flush with
BG brand products (Firestone stocks it).
Good luck and keep me posted, just not sure what you mean by stopped pulling.
Make sure it has the right amount of trasmission fluid in it if you have to replace it i would look around at a good salavage yard for one give this website a try www.junkyarddog.com you may want to give these guys a call they sells only GM-parts its Schram auto & truck parts 1-800-292-1032 and the website is www.schramauto.com wish you the best of luck Michigan Man.
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