unconventional thinking.........

[Rogue Bronco]

Howz this for 'outside the box' ??
recent brain fart came up with this.........
1)take regular rotation front D60 & rear D60
2)run then both upside down (front: spin knuckles-rear: dont matter if swap to disks) therefore BOTH being HP
3)Use marine style engine (counter rotating) to mate to regular drivetrain (ie. marine 350+SM465).

The engine rotation would compensate for the diffs running backwards. Don't think it would affect a standard transmision(syncros are are not directional), Auto's would create some grief. I think axle lubrication would be the only think holding this thought back. Both axles would become high pinion, great for Passenger side T-case users.

Haven't put any real thought into this, but it could work.
Any thoughts as to what other prob.s one would have??

If the oiling prob could be resolved, Chev guys could now have HP diffs without re-tubing. :D

[Stephan]

Imagine running your diff in reverse in 5th gear doing 100k, it would be soooo loud. You may need reverse cut ring and pinion gears. ummm, when you look down at the ring gear, where the tooth starts on the outside, say at the left and goes to the right. I think you'd have to change that around. But then again, I've been known to be wrong.

[Rogue Bronco]

Originally posted by Stephan
Imagine running your diff in reverse in 5th gear doing 100k, it would be soooo loud.
I can't imagine the noise this would create:confused:
The noise heard when backing up is the straight cut gears used for reverse in the transmision.

when I back my truck up in reverse it does whine.
if I back up in 4x4(both axles backwards) it is not twice as loud, its the same.

[desteurm]

Why don't you just change the firing order off the distributor and re-time the sucka? Could that work?

[Rogue Bronco]

Originally posted by desteurm
Why don't you just change the firing order off the distributor and re-time the sucka? Could that work?
When spinning backwards the intake stroke would suck from the exhaust side, and exhaust through the intake.
would require a marine bump stick, Dist, starter,and water pump.

[automan]

i thought std cut and reverse cut on the gears were the way the gears are made not the direction of the gears ie front of a chev uses std cut d60 same as std cut in a ford rear hi pinion would use reverse cut weather its front or back ......am i right or wrong
as for the oiling why would that be a prob its the crown gear that spreads the oil around or in the case of a d60 move your oil fill a little higher its in the cover anyway ....and as far as running you engine in reverse i dont think you would need too ... i tried your idea on the front diff of a chev the pinion to axle rotation seems to be the same weather its upside down or not but i have not tried putting the rear on the front maybe it changes there i dont know but hey maybe your on to something

[Rogue Bronco]

Originally posted by automan
i thought std cut and reverse cut on the gears were the way the gears are made not the direction of the gears ie front of a chev uses std cut d60 same as std cut in a ford rear hi pinion would use reverse cut weather its front or back ......am i right or wrong
as for the oiling why would that be a prob its the crown gear that spreads the oil around or in the case of a d60 move your oil fill a little higher its in the cover anyway ....and as far as running you engine in reverse i dont think you would need too ... i tried your idea on the front diff of a chev the pinion to axle rotation seems to be the same weather its upside down or not but i have not tried putting the rear on the front maybe it changes there i dont know but hey maybe your on to something
It is about how the gears were made/cut and were the pinion is in relation to the crown gear. Ford never made a Hi pin. rear. People put a front HP with different tubes for a rear application.
Putting a front diff in the rear spins the other way, but it faces the other way as well. Same with rear to front. But if ya flip over an axle it should spin backwards to what it normaly does.

[Stephan]

Now I'm all confused. Shoooooot!

[automan]

i might try that with a crapy diff and see if works :cool: cause you never know he he :D

[Dan]

So what are you going to do to oil them? A reverse cut housing has special oil galleries and passages so as not to starve the pinion bearings of oil.

Okay, heres the story. A normal rotation diff is strongest when used as a rear axle. When you use it in the front it is using the coast side of the gear to drive on.

A reverse cut diff is strongest when used as a front diff. The gears are cut so the push is on the drive side instead of the coast side of the gear when used as a front axle.

A high pinion 60 used in the rear will be weaker than if it is used as a front axle.
A regular rotation 60 used in the front will be weaker than the high pinion.

I'm not saying they're not strong enough though.

Make sure you turn your brakes upside down too :P

Back to the original problem, you cant just turn it upside down, you wont get any oil to the pinion bearings.

[Rogue Bronco]

I realize the whole 'diff strength' bit, but D60's in a light weight rig should make that a non-issue.
The front knuckles would have be spun 180*ish, the rear could be swapped to disk so thats fabbed anyways.
The 'upside downess' would be the only prob(I'm thinkin'). It must be doable tho cause guys are runnin Ford 9's upside down(kinda the same, but different).

[Rockfrog]

where have you seen a 9" run upside down? Honestly I'm curious about it.
AFAIK the HP 9" currie makes is actually a modified 8.8" housing (I believe it's from an IFS application used in '97 and up F150's)

[Rogue Bronco]

The upside down 9" is used with portal ends because the 2 gear portal make the axle spin the wrong way. 9" in reverse direction + portal reversing direction = Forward motion :Dhttp://bb.bc4x4.com/attachment.php?s=&postid=66338