What diff to use for a rear A-arm prerunner

[D.Mavis]

I am planning on making a narrow rear diff for an A-arm setup for a front engine truck style prerunner. the truck is going to be heavy and 600+hp. I've always heard that cv's dont hold up to spools. is this before size 30 cv's? I think there are at least a couple of rear a-arm TT's out there anyone know if they are useing spools, open, LS, locker?

Does anyone have a reason for or against or first hand experience of running a spool w/ cv's.

I'm planning on running non plunging size 30's

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[Pharaoh XJ]

Custom 9"

http://www.race-dezert.com/forum/sho...9&postcount=80

[FABRICATOR]

...Does anyone have a reason for or against or first hand experience of running a spool w/ cv's.

"Failure, your campanion will be."

[D.Mavis]

fabricator--- could you give me some background? do you have first hand experience that you can share? I've heard others say that as well but am interested in specific examples or experiences.

thanks!

[Prerunin554]

one truck comes to mind...

but the kinks were worked out from what I hear. Talk to the Pflueger guys

[FABRICATOR]

fabricator--- could you give me some background? do you have first hand experience that you can share? I've heard others say that as well but am interested in specific examples or experiences.

thanks!

Yes, long ago but nothing has changed. Vehicle power and weight have gone up since then so CV size is pretty much a moot point. I've tried to tell some of the greatest designers in the universe but...

With the layout you are planning it might last a while, but not a long while. The car is a package, and the spool is no exception to that. Many things will affect the reliability and longevity of the axles and CV’s. The farther forward the engine, the more it will help. But the greater the power, the more it will hurt. The longer the wheel travel, the more it will hurt. The farther back the fuel cell, the more it will hurt. The larger the fuel cell, the more it will hurt. The higher the vehicle C/G, the more it will hurt. These all work in concert to raise torque on the axles and CV’s, and the lack of a differential greatly compounds the situation. The good thing is that all these can also work in concert to negate the need to use a spool in the first place. If you need an example of a locked IRS situation look no farther than Mr. Harry. It is a package of worst situations.

[Hollowpoint]

Wow, is this the full-size follow up to the single seat rear a arm car? What made you choose a front engine type setup as opposed the rear motor/transaxle type setup you used in your previous car's setup? Is there an updated thread of your first car?

[D.Mavis]

the torque that the cv sees is the enemy of durability--right? so that can be affected by all sorts of things as Fabricator pointed out. what are the conditions that a spool set up would see much more torque than an open diff set up? a tight turn on asphalt, the drive wheels being on different traction surfaces during acceleration, others? it seems like that if you can spin both rear tires on asphalt as I suspect you could that is the max torque that the cv's would see with a spool or open diff, it would be the same. But it sounds like there must be other factors involved. Traction is propostional to the weight over the wheels, so landing from a jump where your suspension bottoms out while on the gas could generate a lot of torque that the cv's see. but in that scenario as long as traction was relatively constant then the difference in torque between open and spool may be nothing? What about over reving the wheels in mid air then landing? if one wheel landed first on a high traction surface the other wheel would have to decelerate and that torque would be seen by the cv's which would be a huge difference between open and spool, maybe thats how cv's break with spools vs. open.

Any other ideas would be appreciated

As far as this being a larger version of my minibuggy. It kind of will be same idea, as far as suspenson, I'm going with a front engine because the drivetrain will be cheaper and it will make for a higher polar moment of inertia which is why I think TT's are faster than CL1's, but I'm sure thats up for debate on somne other thread.

[CaptinCrash]

we use a custom made dana 60

[Dumfast]

we use a custom made dana 60

Any Pics of that custom Dana 60?