Drag Racing Discussions > Front Engine Dragsters

Rear Diff

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Racing6:
Thank You All for the information

dreracecar:
WO231

With all your posts about droping weight, By narrowing up the rear end you eliminate pounds of steel both static and rotational and the wheel weight does not change because all one does is move the offset

rooman:

--- Quote from: dreracecar on May 07, 2014, 07:36:30 AM ---WO231

With all your posts about droping weight, By narrowing up the rear end you eliminate pounds of steel both static and rotational and the wheel weight does not change because all one does is move the offset

--- End quote ---

Bruce, is amazes me that more people do not figure this out. We did it on a pro stocker that we ran in the late 70's in Australia. Those were also the days of the heavy shank style wheel nuts and we replaced them with hard anodized top hat section sleeve/spacers and used regular hex nuts--saved quite a bit in rotational inertia.

Roo

dreracecar:
Roo,
With some people, going on a diet means eating a double cheeseburger with a diet Coke

wideopen231:
I more than understand narrowing the rearend mean less weight.Understand rotating mass lot more important . Thats why I paid extra for drilled  with extra lightend flange axles.I also understand the tire has to clear frame.Running 4" bs now. Not much less I can go. Need 3"bs . New housing is 31" and flange to flange is still 39". Can not get any less. Cage 25 os tire bs counting bulge 5.75(x2) 1"(x2) clearance 38.5 total.Actually axles where ordered for 37" and had to pull them out 1" each leaving 1.25" spline engagement which is .25 more than strange says is the minimum and I am not happy about that. But it is what it is.

Just spent two days and cpl hundred bucks  fabricating moly rearend housing to replace mild steel piece.Cheated and took page out of Parks book.  15 lbs lighter than old one I had in it. Only thing I should have done different was install some sealed blank offs as fillers in bottom on each side to reduce capacity. Figure 4.5 wide pieces of 20 guage cant't weigh near as much as fluid.Trying to find out level fluid has to be at for proper lubrication. I figure with sealed bearings it can be lower since axles do not need any. If you look at the design you will see the bottom has slow tapper from center to ends.If level it at normal level  it will take 8 or 10 quarts. with blank offs I figure I can save half or more of that and thats 6 to 8 pounds.

NOW IF LEVEL  can be lot lower then Im good.

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