I have an 01 F250 auto with the 7.3. Last Sept the transmission went out in TX on a road trip towing a trailer. I had a shop in Sherman, TX called Alpha Transmission rebuild it. The price was $2800 with a heavy duty torque converter, brand unknown. The truck has drove and shifted great for the most part every since. However, this winter I started doing some fishing and I noticed when the truck is on a steep incline of a boat ramp it will not move unless I give it a lot of gas, like the transmission is not engaging or something. I checked that the fluid level is at the top of the high mark. I put the truck on a hill at my house and it always takes about of gas and with a sudden jerk it starts moving. I am obviously not going to take the truck back to TX to let the shop look at it. Is there anything I can check on my own? Should I take it to a local trans shop and let them look at it? I am in Hoffman, NC.