Re: shift speed
I had the same tranny rebuilt (I believe it's an EL40 or something like that) and the guy that did it put a delay valve in it. But it made only overdrive shift in later. I was told (and I trust him, he's a fleet service manager) that overdrive was supposed to kick in at 40mph from the factory, and that the delay valve changed it to 45. Sounds like you have the opposite problem though. Check your tranny detent cable. It's connected to the throttle lever up under the air cleaner, opposite side of the lever from the throttle cable itself. You'll see that at the end of the detent casing there is a large black adjusting block with a semi-circle metal tab that you push in to adjust the casing length. Sounds like you want to want to shorten the casing, so press the tab, and bring casing towards open end (if that makes sense!) You'll hear clicks, only move a couple at a time then test drive. Should help. If it's too out of wack, truck'll rev high before shifting (like yours), or will shift to early and be real doggy. Mess around with it, just be sure you don't go so far that the tranny drops hard when shifting. This was what I had to do (and was told to do by him) and it worked. Did you put the tranny back in yourself? I did. But if someone did for you, they should've done it for you.