Hello folks I wonder if anyone can help me, please? I have a quick change rear end in my sprint car and it looks like some sort of home made one. I don’t see any form of branding etc on it. I guess the gears inside are off the shelf items that fit other rear ends, but I wonder if you can tell me what they are, as I would like to get a couple more sets. Also it would be handy to find a source of cover gaskets, so that I don’t have to make one every time I swap out the gears. Anyway, here are some pictures...
If the lower shaft and pinion are 3" C to C, then it uses the common Halibrand style gears. How wide are the gears? Probably uses V8 style, or Midget style if narrow.
The shafts are 3” centre to centre. The gears are 1 1/4” thick - so I’m not sure which ones I need to go for. I thought they would either be 1” or 1 3/8” any ideas?
Does anyone know where my 1 1/4” gears could have originated from? Any help would be great, as I would like to find some other ratios to try out. Thanks Mark
If your QC is teardrop shaped at the rear it could be some sort of Casale. Casale is still in business building boat V Drives. I don't remember how wide Casale gear are, but they originally built midget parts. THANX RICH
Thanks - i have checked it out. The only Casale gears that i can find info on are 10 spline and 1 3/8" Could I mill down a set of 1 3/8" gears or would they be way too hard? Or maybe fit a spacer behind a set of 1" midget gears?
@ Little Terry, Looks like the other guys pretty much covered it. I would concur that it is likely the common 6 spline used on virtually all Ford V8 based QCs. As you already know, these are currently available in 1" and 1 3/8" widths. Is there any clearance between the cover and the gears now? I'd like to see the pinion retaining nut arrangement. Any way that they can be made narrower? Is there a spacer on the lower shaft? Can the change gears be moved forward in the case? I have had no luck in milling any Quickchange gears as they are damn hard. I'm not saying that it can't be done, just that I haven't found tooling to do it. I have cut one into a square using an abrasive chop saw. If you could fixture them up to get a reasonably straight slice and them finish up on a surface grinder, it might work. That would be and expensive set of gears! You could also make a 1/8" spacer for the rear cover. If none of that works, buy 1" wide gears and space them out within .020" of the cover.
McMaster-Carr sells shaft spacers, you could get a couple .250 thick ones and then run the 1” thick gears if you’re not exceeding the HP rating of them.
Just looked at your pictures again. If you had a machine shop build you a spacer they also could machine an o-ring groove into it for both sides. That would allow you to maybe run the thicker gears and also solve your gasket issues. Just letting my fingers do my thinking!
Please send pictures & specifications of the sprintcar & motor, & more importantly, what ratio do you have inside the rearend, & where do you plan to run the car(what size track or road course?)
It has a 9-37 ring and pinion. The gear set I have is 22/26 teeth, so gives me 3.48 or 4.46 according to the charts I have seen. The plan is to race this car on the sand. I will need a push truck to get started (no battery start and an in-out box with no clutch). Track is 1/2mile long with 1/8 timed section at the end. Motor is a 270ci gmc with triple 97’s.
Sweet! You’ve got a Jimmy! Please, more pictures of the engine and what’s been done to it, and there is a thread for Inline 6’s in your Hot Rod too you could post the pictures in.
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