Ned -- on the motor angle -- you got it. Most everything I've ever worked on is at 3* down at the tailshaft.
When mocking up -- don't forget your other angle -- which is CENTERLINE...
AND
Don't forget to mock up using your urethane mount. A guy I know (not me!) built a whole tranny mount and forgot to include the mount...
SECOND QUESTION:
After you set your motor/tranny - Get your pinion angle set to "match" (parallel plane). Watch your centerline. (BTW - Some Mopars offset the engine... I would assume yours to be on center?
The shock mounts need to be the same angle. The shock would not be happy trying to bend. Easy way to set height and get that angle -- get yourself some square tubing - set up your ride height -- and that will also locate the axle perches. Bolt them up to the mount and tack weld. Don't forget to space the square tubing off the mounts the same amount as your "shocks" will be etc. Also make sure whether or not you want them 90* or at a 15* angle (to the axle as in bottom of the shock towards the tires etc) etc.
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