Ive got a 2 wheel drive 85 gmc suburban 3/4ton with 454 and turbo 400. when i baught it there was a noise comin from tranny but only in first gear. it had no problems with shifting till i moved and towed a 16 foot trailer behind it. now when its cold the tranny shifts fine but when it warms up it shifts hard from 1st to 2nd and wont go into drive. sometimes i can drive it about 4 miles before it acts up other times i dont even make it a block. is there anything i could try without rebuilding it or getting a new tranny?
You can try flushing it using Seafome and replace your filter and fluid adding some trans tune with the new oil can git this things from most part stores . Hope this helps.
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Sounds like your talking about a transfer case problem, need to have the truck to look over ,test,road test etc Can't do anything from here,without the patient
You need to find the leak (probably in one of the cooler lines or the pan gasket) fix it, and make sure you have the correct fluid level. If you do all that and it still won't go you probably wore out the internal components from driving it with low fluid. Good luck.
Your suburban should have a 4L60E transmission if it a 1/2 ton C1500. Mine is a 4 wheel drive, but it is the same transmission except for the tail shaft to accomodate the transfer case. The 3/4 ton trucks came with a 4L80E.
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