JimS

Planning a build up. What rearend do I need? Do I have to tub and do a fabricated 9" or is there a set of gears/axles that will be likely to hold up behind 1000 hp? I don't plan to get on it from the start.. only rolling starts.

ZZebes

iTrader: (10)

14 Bolt Semifloater i would think

even a fab9 is not designed for the weight of a truck

axisT6

iTrader: (3)

Tubs are what you need for larger tires, not necessarily power handling. Two choices would be either a 14 Bolt Semi-Floater with Aftermarket Shafts and a Detroit Locker, or the 14 Bolt Full Floater with a 6 Lug conversion.

I am building the 14 FF with 6 lug conversion for my truck. OOFF TEH BEEF!!

DrX

iTrader: (7)

I am thinking a 14 bolt FF conversion for my build.

Mr. Sandog

14-bolt SF = 9.5" ring gear
14-bolt FF = 10.5" ring gear

TurboGibbs

iTrader: (6)

I hate to keep saying it everytime a question of axles come up but Parish ran a 10.08 on hard launches with a stock axle that only had a heavy rear cover and an Eaton posi weighing 5000lbs.
An example of how much more stress the hard launch puts on the axle vs a roll: I snapped a stock axle with a 5000 rpm clutch dump and 400rwhp. Parish never snapped one with 1000+rwhp. I know some of his tq was shared with the front axle but in a hard launch situation I bet the front might have been taking 20% of the load.
IMO if all you want is rolling launches and not putting slicks on it and doing full power launches then a larger axle is a waste of money.
Also, Curtd went a 10.68 with a stock axle with eaton posi and heavy rear cover weighing 4500lbs and his is 2wd.

built408

iTrader: (10)

If you don't plan on putting big sticky slicks on it and taking it to the track, the stock rear end with a girdle will be fine, with that much power you will just blow the tires off.

Deckhand

iTrader: (1)

Im making a little over 600rwhp and I stripped my ring gear on the street with slicks... I think with some serious hookage and power, its going to break eventually.

https://www.performancetrucks.net/fo...d.php?t=381426

Mr. Sandog

Depends on if you like to do upgrades or make repairs.

JimS

That's what I was wanting to hear and what I had planned on trying to do.

I just don't want to cut up the bed to tub it... although I like the bad *** looks of tubbing it So I might do it even if it's not smart. NOBODY ever accused me of being smart, especially when I make decisions that involve having FUN! Good grief!! I'll start gettilng Medicare in two weeks and I'm still basing decisions on having fun! I know that I "should" grow up but I also know that is unlikely to actually happen.

But if I tub it I"l have to get new wheels.. everything! Were talking another $10K here. Guess it won't be THAT much fun to tub it and maybe a 427 won't be THAT much more fun than a healthy, blown (and maybe juiced?) 408? Big difference in $$$$. I think. I haven't actually priced much stuff but I know that SD wants about $2500 more for a 427 sb than their 408 goes for... and that's just for starters.

I'm also not clear about what will bolt on to a 427. Will my heads work? How about headers? I know most everything from my 5.3 will work on a 408 and I "think" the same is true for a 427... but I haven't heard that for sure. How 'bout it?

A level 5 FLT is in the plan. Pretty much a sure thing even if I don't do any build at all.