I'm a little hesitant to ask because I know there are so many variables. But here goes.

We've been restoring Dustin's El Camino now for 4 years and it is finally done. It has been started occasionally through out the year to move it out of the shop. Now all of a sudden it started acting up. After starting it I go to place it in drive and it acts nearly unresponsive. To the point I wonder if it is in drive at all. Give it a little gas and eventually it starts moving forward. On the road, it still lights up and goes like a rocket on wheels but the hard shifts between gears is gone. When we first got the car it was very responsive. It does have a 2600 Hughes stall and supposedly the transmission was professionally rebuilt for the strip with less than 2000 miles on it. I cant vouch for that though. Right after we bought the car I did change the transmission oil and everyone I asked said to use Dex/Merc oil so I did. I remember the last transmission I rebuilt (over 15 years ago) suggested I use Type F. I cant remember if that was due to the clutches or due to modifying the valve body for harder shifts.

Could the seals in the pump have gotten dry and cracked if it sat say.....4 months without being moved? Or maybe the wrong transmission oil? I dont feel like it was from being torchered because it really hasnt been since we bought it. Lit the tires up maybe 3 times, and that was with street tires with no traction.

Any thoughts?

David