Random Information - Weight of Driveshaft

[GasGuzzler]

I shouldn't have predicted failure but I was trying to say they're not as strong as they look and I'm not sure I'd swap just for the weight savings.

Moze's truck is quite a bit lighter than Clifford too so that helps.

Virgil, your front axle has survived fine so it seems to me the rear axle and shaft take most of the hit AWD.

Might be weird logic on my part.

[mean05]

i never had one problem from my t-case or front ent at all...maybe i just got lucky...but what do i know i just drive it race it and break it

[Justin_Inc]

IMO, its not so much the power but shaft speed from what i've seen, turning that aluminum shaft 120+MPH just is not that smart....

[TurboMic]

yes, critical speed is the issue with drive shafts..... with a high rear gear and no more than a 1:1 tranny you will be fine for alotwith such a big od shaft. but Im having one built, just b/c ive seen what losing a shaft can do...lol.. mine will be 4'' chromoly

[GasGuzzler]

Good call. After seeing some 4.10 geared trucks do almost 160 on the dyno it makes me worried about my shins.

[farmtruc]

Aluminum has a higher critical speed than steel, so an aluminum shaft will spin higher than a steel. At high speeds, strength isn't much of a concern as balance. Also, the larger the diameter, the higher the critical speed.
Gear ratio plays a large part in critical speed too. You can increase the critical speed by installing a set of numerically lower gears, say from a 4.10 to a 3.08.


Steel is stronger than aluminum, plain and simple. All N2O, hi HP manuals, transbrake equipped cars that are making lots of power, are running steel, just as I will be starting today.
The shock of the launch is what hurts the aluminum, depending on what it's made of, it may twist or snap and make a clean break (like mine).

Quick, you make us assume your truck is putting out tons of power from your post, did you get it dyno'd, I'm curious as to what it's laying down.

later,
allen

[Slimsilverado]

NHRA Pro Stock cars use Aluminum drive shafts and there are some high HP cars running carbon fiber shaft as well. I would not trust any stock shaft for high HP. I think of getting a custom Spicer Alum shaft made for my truck.....

[George C]

Aluminum has a higher critical speed than steel, so an aluminum shaft will spin higher than a steel. At high speeds, strength isn't much of a concern as balance. Also, the larger the diameter, the higher the critical speed.
Gear ratio plays a large part in critical speed too. You can increase the critical speed by installing a set of numerically lower gears, say from a 4.10 to a 3.08.


Steel is stronger than aluminum, plain and simple. All N2O, hi HP manuals, transbrake equipped cars that are making lots of power, are running steel, just as I will be starting today.
The shock of the launch is what hurts the aluminum, depending on what it's made of, it may twist or snap and make a clean break (like mine).

Quick, you make us assume your truck is putting out tons of power from your post, did you get it dyno'd, I'm curious as to what it's laying down.

later,
allen

never got it dyno'd yet. its winter here and i need to get a set of 340s. one of mine died back in nov. i plan on dynoing it come spring.

i have no idea what power makes, i do know my duty cycle was 111% with 60s, i do know i can break them loose at 90mph with my 305s on my SSS wheels on 18psi. i know from seat of pants its the fastest combo ive had. i know i run 18* timing without any KR yet

so whats a PT88 dyno usually at 18psi with a manual?

[farmtruc]

never got it dyno'd yet. ...

so whats a PT88 dyno usually at 18psi with a manual?

I would say at least 600whp, that would be impressive and right on the mark!

[mean05]

IDC is also effected by having the wrong flow rate table in there...Moze is at 95-102% and making 450rwhp...just saying