Quote:
Originally Posted by Scarebird
OPH: does GM still use the 12 bolt in any production capacity?
I know my '16 Sierra half ton has a 8.5, not sure if new trucks still use them...
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On any form of 8 7/8" GM 12 bolt, not, that I've ran across. The Chevy truck 12 bolt ran its course after believe it was the 83 models. On the latest 8.6 GM 10 bolts in pickups I have not kept up with their changes & am not doing bench builds on them. Over the years the local GM 1/2 ton 4WD beater playing in the mud crowd really wore out my patience.
12 bolt truck rears... the 76-79 Chevy Big 10 & Heavy Half Pickups used the 12 bolt truck rear, as well as stronger springs front & rear. My Dad special ordered new a '78 short wide Big 10 Silverado, easily the best GM pickup that ever went through our family. At one time Moroso had a contract with Eaton & offered low ratio Brute Strength HD Eaton posi carriers for the 12 bolt truck rears. Set up several of the Brute Strength truck carriers & new gears in core housings in place of destroyed housings that Eaton Govlocks had taken out the ring & pinions & lh cap mating area. Am not that big a fan of the 12 bolt truck housing & gear design for 4000 lb street/strip 1/2 tons. If I was presented with building another such rear, would most likely go a different direction.