4L60 questions

[RedBed]

I just got my truck back from having the TH350 swapped out for a ('91) 4L60. We did not change the rear end gears (yet, anyway).

I don't know squat about transmissions. I do not know what rear end gears I have either. Were 3.08 stock?

Anyway, as I accelerate and get up to about 60-65, the truck feels like it bogs for a second (almost like slight braking) and then I give it a little gas and it seems to get up out of it. But I can't really tell if it's a lockup problem, or if it is just not getting into OD. If I have 3.08s, maybe there's not enough rpm to get into OD? Or maybe the lockup is going in/out?

I will be taking it back to the shop, but I am just wondering if anyone has had this problem, or any ideas?

(note: I do not currently have a Tach, but will install one in a couple of days)

I'm trying to learn a little...