But the Halibrand QC was not hypoid, despite lowering the driveshaft! The actual pinion was still centered horizontally on the ring gear. It was simple a centered rear end turned backwards...the lower shaft and gear were just a means of turning the driveshaft 180 degrees. The mission of dropping the drive was accomplished, probably with lower power losses than a hypoid R&P would have caused. I remember reading in circle track that a class of late model "stock" cars, a division of NASCAR one level below the top, ran both 9" rears and Championship type QC's. They noted that 9" cars generally need a lube cooler for the rear, the QC cars did not. That heat of course is energy subtracted by the hypoid gear contact...The QC carried straight cut change gears and spiral cut but centered R&P, both with lower contact friction that a hypoid rear. And...once a few QC rears were sold based on the 9". Due to pinion location, the input shaft was at the top and pinion drive at the bottom, reverse of an early style QC...so this rear actually RAISED driveshaft due to hypoid gears!
Just to add to the confusion: he center distance on Halibrand and other QC's was 3" for the Model A (midget) and V8 rears. The Champ (3/4 ton) is 3 1/2". My guess is that Rat_Fink is thinking about building a 9" based QC. The worst of both worlds!
That's the problem with vague questions - and it happens all the time. I wish people would explain WTF they are wanting to actually do or buy so that people can at least try to provide relevant or useful answers.
as I noted, there IS a thread on here somewhere about a briefly produced 9" QC. It was an inversion of the early Ford car and truck based ones due to the low pinion. The center distance on Ford QC's is only 3" for the driveshaft to pinion...pinion offset remains at zero.
It is too bad that R F can't be bothered to answer the question that has been asked of him. He continues to insist "I want the offset", but refuses to say why. You guys are too generous with your replies and attempts to guess what he is really after.
Yes you are right ..Isn't someone [speedway engineering?] making one [quick Change] with a hypoid gear set? I know I seen an ad stating hypoid somewheres..
Just to confuse matters more, you can get a 2-speed unit that goes on the pinion of a 9". http://hone-o-drive.com/product/b230/
Holy s##t! I didn't know they were still around! Local guy back in early 70's had one in his big olds mounted in between the trans and rear axle connected by driveshafts, sure had some top end mph...
There was at least one QC builder in the early '50's that put 4 gears instead of 2 in the change housing, with some sort of shifter, making the QC into a 2 speed allowing almost any combination of ratios. Sounds like something needing to be revived! Halibrand also made a few, including an Indy version for the rear engined Offy types meant as a response to the rear engine Fords.
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