I've searched the forums and I guess I have the first hard tranny failure of a Base model XLR.
It happened while doing some "SPIRITED DRIVING" at NCH last month.
Symptoms: When auto or manual shifting from 2nd to 3rd gear, the tranny shifts out of 2nd but won't shift into 3rd unless I let off the gas pedal. If I don't let off the gas pedal, the engine over-revs as though I missed 3rd gear in a manual transmission.
There is no problem shifting from 1st to 2nd, 3rd to 4th, 4th to 5th or even down shifting from 5th to 4th for passing.
I drove it from BG, Ky. to my daughter's in Wisconsin and then to Colorado Springs, Co. where I had it checked out at Red Noland Cadillac. They informed me that they would have to replace the tranny and I would have to leave the car there.
I could not do that so I drove it home and am in the process of replacing the tranny myself.
I was lucky getting the replacement tranny from gmpartsdirect.com as they had them on sale.
Here is an interesting fact about this tranny!( P/N; 96042733, aka 5L50-E)
This is the same tranny used in quite a lot of the GM vehicles, i.e. Pontiac, Olds, Buick etc. In other words, it IS NOT a special tranny for the base model XLR!
Now, I have a question for jjmoody.
Did you change your differential gear rational from 2.93 to the 3.42 as you were going to and how is that working out?
At 75 mph in high gear, how many rpms is your engine turning over and what effect did it have on your highway mpg?