Pinion angle and driveshaft length.

72ScampTramp said

You likely wont find a 7* shim to correct the current angle issue. The locator pin won't engage the perches, too short."

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You do not EVER lay a shim over the pin, you ALWAYS always use a new pin and the shim is part of the spring pack...
You always machine the drilled hole in the shim for the pin to sit square to it.