Need some good suggestions what I can do to make my TH700-R4 go into OD. Transmission ran great 6 months ago, since then I've had the car in storage up blocks. Last week I changed the oil and ever since then it will not shift into 4th. gear. I followed the procedure on www.tvmadeez.com to adjust my TV cable. Engine runs great and tranny shifts smooth, but I can't do any highway driving with tranny in 3rd. and the rpm's why up.
Need all you transmission experts help please.

 

When you changed the oil did you by accident knock the connector off the 4th gear switch under the oil filter?