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Discussion Starter #1
Recently at about 115k miles I started having a problem with the trans. When driving it shifts to 4th and then when you slow down it does not downshift unless you floor it. It tries to accelerate from 1200 RPM in 4th. Obviously this does not go well. When driving with D3 selected it performs normally as it does not use 4th. This only happens when selected in D. Then yesterday when it was cold and driving in D it would not shift to 4th. Before I put a new trans in is there something else I should be looking at? No OMB codes.
 

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Discussion Starter #3
Plenty of fluid. No leaks in the tranny. Clean fluid. Fluid and filter changed about 25k miles ago.

Rear main does leak a little. Not enough to leave a drop on the garage floor, just see oil around the rubber plug in the bottom of the bell housing.
 
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