This is pretty long, please forgive my wordy explanations.
I guess I should clarify that my rear height is not the product of old, bad, weak or broken rear leaf springs. I bought new leaf springs from Eaton last year. I thought by virtue of them being 54 years old that they might be the reason for my rear being down a little lower than the front. I replaced them with stock factory height springs. I worked my butt off swapping them out this past summer only to find that the new Eaton springs left it 1/4" lower than the factory ones were....No Cigar!
Anyway, turns out Herb Adams (Firebird Suspension Guru) designed the Trans Am to be slightly lower in the back.
My engine/trans is at 5* negative slope. My stock valve covers with 1" spacers contact the vacuum booster when I raise the transmission tailshaft about 1/2". That puts the engine at 4* negative slope. I think I could get it to 3* if I could lift it higher.
The first thing I gotta do is yank the valve covers off, remove the 1" aluminum spacers, remove the too tall PRW steel roller rockers. A member here informed me he has a higher lift roller cam than me and it all fit under his factory covers. He is using Harland Sharp roller rockers. If I can lower these valve covers I should be able to get my transmission a little higher up in the tunnel (hopefully leaving a little room without contacting the floor pan, it's pretty close). If I can lift it up to negative 3* with my driveshaft @ negative 2* I would be in the ballpark. I then could simply to set my pinion allowing for axle wrap to wherever I need it. The car drives and handles well right now. at 50mph there's no vibration. I want to be able to drive it as fast as I want to. I just don't want to hurt the front U-joint. It's at 6* sitting still, I know it's probably at 8 or 9 cruising on the highway at 50mph. Hope this explains my dilemma. Thanks to everyone trying to guide me in the right direction.
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