I just finished installing a Hydro-Motive modified early Olds based 4 speed hydra-matic behind my Chevy engine and fresh rebuilt chassis. In neutral the car is very hard to push... it could be everything adding up, new front disc, rear diff is rebuilt but sat for a year in that special lube that gummed it up, but it does turn by had with some effort. Now that I installed the driveshaft, it takes a lot for me push the car in the shop. I did a very short first drive around the block and it goes ok... its not dragging it to slow it down, I don't think its loading the engine but I also have about a 2800 stall torus coupling winding up before it moves. Transmission backstory... When new the trans had very few passes, motor blew and put in basement storage in the early 60's. I took a retired specialist who like I was amazed at the clean inside condition, no rust and still wet with fluid, inside bands were thick like new and seals were soft, decided to leave it. We did adjusted the bands and servo following the Hydro Street Strip book using the correct tools. One missing piece was a quick release lever that loosened the rear band for a clean shut down. It was replaced with the factory band adjustment bolt. I could turn the transmission over by hand with the yoke before the install, it was tight but could be turned. Install had no issues just as the Hydro-Motive instructions said and test stand ran fine. I'm wondering if the Hydros were took a little force to turn over new? Does the rear the bands drag on the drum? Maybe the quick release was there for easy rolling too? Maybe I just need to put a few miles on things to loosen them up and watch fluids and temp? Thoughts and ideas appreciated.