Yup, it sure does. Consequences of how low I have the car. As the rear comes down, the pinion moves upward in relation to the transmission, causing the driveshaft to travel upwards.
I have some things working in my favor to fix the issues though. I don't run a carburetor, so my engine inclination doesn't need to care about float levels. I also run electric fans, so I don't need to worry about the fan coming in contact with a shroud. Between moving the pinion down a couple degrees and moving the output shaft up a degree or two, I should be able to get the driveshaft in a more favorable orientation, primarily to the slip yoke. I believe that will return the car to shudder free orientation. I may have to play with it a bit though.
I can't really measure it well with the new crossmember in the car, but I suspect the tail shaft sits 1/4 to 1/2" lower in it's current configuration. The factory TH400 crossmember appears to sit higher than the g-force crossmember and there was an added 1/2" bar stock on top of that to extend out the trans mount to support the long tail TH400.
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-Jason
1969 Pontiac Firebird
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