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i had a similar experience in a front wheel drive lumina i used to have. it had the 4T60e tranny- which is just the 4L60e twisted sideways for a front wheel chassis. it would start out in second, and not have overdrive. i found a fuse under the hood that was blown, and replaced it. it worked fine for a while, then blew out again. i lived like that for a couple of months, then talked to a tranny tech at a dealer. he said it was the shift solenoids in the valve body. so, i replaced 2 out of the 3 solenoids in there- it still did it. i guess that third one was the bad one. the solenoids were like $12 and $14 or something at the dealer, and aren't too hard to replace. well, on the fwd tranny, they were under the side cover that i couldn't get totally out of the car- so i had a bit if fun. but on the rwd tranny, they should be on the valve body and easy to get to. i'm sure there's a way to test them with an ohm-meter or something, but all 3 will only be under $40, so why not do them all?

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