68-72 Chevy Chevelle Posi - auto parts - by owner - vehicle automotive sale - craigslist Selling a nice Posi out of my 69 Chevelle Elcamino. Works excellent, is a 8.2 10 Bolt 2:73 ratio in excellent condition. This Posi Unit will accept a 3:42 Gear Set. Width of Rear End is 62.50 inches This rear end will Bolt up and fit 68-72 Chevelle, Buick, Oldsmobile, and Pontiac A body Cars, Installing a 12 Bolt in the Elcamino, to accommodate my BBC motor $1000
I just sourced a posi unit (from FABCRAFT) to rebuild the 8.2 in my 1970 GS Stage 1. The installation instructions included with the kit had an interesting note attached to it (see below). Apparently all GM 8.2’s are not created equal … FYI “ DO NOT CONFUSE THE STANDARD GM 8.2″ GEAR WITH THE ROBUST BUICK 8.2″ RING AND PINION. BUICK DID THEIR HOMEWORK! NOTABLE FEATURES: BUICK 8.2″ USES 10 7/16″ RING GEAR BOLTS (SAME AS FORD 9″)– BUICK USES LARGER 27 SPLINE PINION YOKE AS OPPOSED TO CHEVY 8.2″ 25 SPLINE– BUICK 8.2″ USES A HUGE 1.875″ PINION BEARING THAT DWARFS THE FORD 9″ — BUICK USES OVERSIZE BEARING AND CAP ON THE RING GEAR SIDE OF POSI UNIT FOR STRENGTH– BUICK 8.2″ USES THE MECHANIC’S 3R U-JOINT FOR ADDED RELIABILITY– BUICK 8.2″ USES A MUCH HEAVIER REAR END AXLE HOUSING FOR RIGIDITY– BUICK 8.2″ USES A MUCH LOWER PINION CENTER LINE (HYPOID) IN RELATIONSHIP TO THE RING GEAR PROVIDING MORE TOOTH CONTACT AREA THAN THE FORD 9″– BUICK 8.2″ USES AXLES RETAINED WITHOUT USING THE DREADFUL “C” CLIP- ALL CHEVY 10 AND 12 BOLT REARS USE THIS “C” CLIP SYSTEM AND MANY QUARTER PANELS HAVE BEEN DESTROYED FROM THIS POOR DESIGN FAILING. YES, THIS IS AN 8.2″ RING GEAR SET AS ARE THE CHEVY AND PONTIAC, BUT THAT IS WHERE THE SIMILARITIES END. THIS IS AN OVERLOOKED, DEPENDABLE REAR AXLE ASSEMBLY AND NEEDS TO BE REVISITED BY THE “BUICK BOYS”! SEE OUR INSTALLATION KITS HERE IN THE STORE AS WELL”
