Hi guys This is the only number I can find on my cars rear endAnyone know what I have? 1382743...42-13...G.M.C....(H)
3.23 ratio, standard on '70 GS 350. Two letter stamp on underside of LH axle tube will confirm it as an original 8.2" rear. LC will indicate open rear while LP indicates posi. traction. 1382743 may be a casting number? Does not appear in my parts book from '81.
GM 3.23 & 2.56 8.5 gearsets have the machined groove on the side of the ring gear. Appears you have a 3.23 8.5 gearset in your rear. On the pinion flange, does th rear have 7/16" headed bolts & straps??? Got Posi? :3gears: Roger
Roger that is a 8.2 gear it has 3/8 right hand thread bolts check the picture. Jim I have seen these gears sets in pontiac rears alot. with the groove and 8.2 ring gear .
Jim, I'm 99% certain the 3.23's in above pic are not '64-69 Pontiac 8.2 gears. Have sold four sets of Pontiac 8.2 3.23's over the last few years, will have go back through shipping invoices for their gear numbers. Shame we don't have a casting number on the above rearends center housing or a pic of the pinion flange. That would help immensely. Got Posi? :3gears: Roger
Looks like an 8.2 pinion flange to me. I don't see any threads. Chris, doesn't the pinion flange have u bolts and 1/2" nuts. No squared off lugs on the bottom of the housing also.
Pic of the open center housing gives the impression that LH bearing cap is the version used on '68-70 BUICK 8.2 rears. This LH bearing cap is slightly longer bolt to bolt centers, in order to accept the larger lh carrier bearing race used in '68-70 BUICK 8.2 10 bolts. From that, it appears the rear is a '70 BUICK 8.2 singletrack rear, prob the one original to your '70 GS 350. Got Posi? :3gears: Roger
I was just coming in to delete that post because I was backwards on that. Sorry for the mistake Devon! Tim:spank:
