CAR REARS DON'T INTERCHANGE WITH TRUCKS. The last year for cars was like 1971 then all GM went to corporate 10 bolt 8.5". gotta watch around the 69-70 era as all the gm makes had their own unique 12 bolts. chevys being most popular of course. best place to look for one under a truck from 78-81 is a diesel and there are plenty of dead ones in the bone yards. DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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