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Re: 57 GMC how rare??
New list and changes
2002 5.3L
1999 4L80e
1999 14 bolt 9.5 rear with 3.73 gears
side engine mounts (tube style under engine didn't fit very well)
engine is 2 inches forward and approx. 1 inch lower than stock
factory 55 driveshaft shortened about 2 ft in font and about an inch in rear
55 rear and 99 rear were almost identical, same tube diameter and same ujoint size. 99 rear is 3 inches wider so only 1.5 inches per side.
Everything moving ahead slowly but going good after giving up on the man trans part.
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