I recently replaced my 4l60e tranny on my 1994 Chevrolet c1500 with another 4l60e (M30) transmission because my other on was not getting overdrive (or 4th gear). Today I drove it about 50 miles without a problem. It took off fine at stop signs and got overdrive just fine until I pulled up to a speed bump. I went over the speed bump slow and went to give it gas and it acted like it was in 2nd gear. No high revs on rpms, just crawled until it reached about 30 or 35 and then drove fine. All my other gears are working fine except takeoff. This tranny came from a running 94 truck and did fine until that darn speed bump.
checked all connections and fluids. Need help!

 

REally guys! No one has any ideas on why this is doing this?