well ive been seeing on here that when you move to 4.56 gears with an aluminum drivshaft, there has been numerous cases where the drivesaft has broken. so i looked into getting a steel driveshaft put in and i called a local shop and they say i cant put a steel driveshaft in because it will be too long and thats the reason why theres a aluminum one to begin with. can someone please help?

 

Sounds like that shop is full of **** and needs to be shut down. I have never heard such nonsense before in all my days. Find another driveline shop.

 

yeah...... material being used does not determine length. i can't find any logic behind that answer.

 

only reason I can think of is that the steel driveshaft might sag due to its own weight, where an aluminum one wouldn't since it's much lighter. yes aluminum is weaker, but it loses more in weight than it does strength.

maybe they meant that the stock steel shaft is too long off of another struck is too long for the trucks that have the aluminum shafts?

you can get custom shafts built from a lot of places. search it. i would just leave the stock shaft. don't know what it looks like under a 2wd, but i can't imagine it taking out too much else if it ever goes out.

 

that seems to be the answer im getting, that guy was full of ****. so ill be looking for more shops tomorrow. im not worried about it taking things out, but i am worried that when i get my 35" tires and 4.56 gears...itll be too much for the driveshaft causing it to reach its critical zone thus breaking it. a steel driveshaft wont do that.

 

This "critical zone" talk is a bunch of horse hockey. Yes, an aluminum driveshaft is more prone to breaking than a steel one, however, I'm sure there are literallyhundreds of people with 2wd Hemi's who have performance mods out the a$$, including 4.56 gears, who live at the damn tracks on weekends, running all out, without EVER busting a driveshaft. I know a guy local here who has his '05 RCSB 4x2well over400 RWHP who is always running at the track with his original drive shaft.
I wonder what the ratio is of 2wd Hemi's that have busted a driveshaft vs. how many 2wd Hemi's with aluminum driveshafts that have been sold. I'm guessing it's a VERY SMALL FRACTION OF 1%!!!
Sounds more like a cop out to not spend the money on gears and labor to me. You don't want to spend the money on the mod, that's perfectly fine, it's your truck and you can do/not do anything you want to it. But I think it's idiotic to not do it because there is a minuscule chance your driveshaft may break. That would be like leaving your truck in the garage 365 days a year because there is a chance someone could hit it on the road. [&:]
Like I said, I'm taching about 400 more rpm at 70 mph. If that difference is gonna break a driveshaft, it was gonna go eventually anyway.

 

thank you hammer! now my next question is...if it did happen to break what would be the worst that could happen?

 

unless it just happened to hit something when it exploded and broke it, then you'd have to replace the driveshaft.
I think I recall hemiyellow blew his out a while back, I think the only major component he had to replace was the shaft itself...

 

hemiyellow did break his and he went to steel after

 

you could try looking into a custon 2 peice like on a big truck, dump truck things like that. 1 shaft from the Trans 1/2 way back then to a carrier then a 2nd shaft to the rear.

:2cents