Brady

iTrader: (3)

Strange 12-bolt with 33 spline axles, spool, aluminum cover, Spohn Drag Bar Aerospace drag brakes, no fluids, 5/8" studs with lugs and spacers.

VS.

Billingsley Fab 9, 40 spline gun drilled, star flanged axles, aluminum center section, billet pinion support, billet yoke, lightened spool, pro gear, Billingsley anti-roll bar, Strange drag brakes, moser torque arm mount no fluid, 5/8" studs with lugs and spacers.

12-bolt- 240#
Fab 9 - 200#

These weights are as per my $7.95 walmart bathroom scale.
belive it or not.
...*****

LC

the only "bad" thing at least for me is the price

SPANKY LS1

iTrader: (24)

I would have thought the difference would have been greater.

Shawn

NA$TY-TA

iTrader: (21)

40lbs lighter is alot for something thats bigger.....

SPANKY LS1

iTrader: (24)

A 12 bolt would probably lose 40lbs with a set of gun drilled star flanged axles, a lightened spool, and a lightened pro gear.

40lbs just doesn't seem like much for a rearend that costs double what the 240 pounder does IMO. Although it is probably a MUCH stronger piece. For a hardcore car, there are more advantages than the weight loss, but I just thought it'd be a bigger difference.

Shawn

Brady

iTrader: (3)

I thought it would be a bigger difference too.

99LS1_TA

iTrader: (3)

Does anybody know what a stock 10 bolt with factory brakes weighs?

kp

iTrader: (34)

That was with no rear sway bar on the 12 bolt?

Damage Inc.

iTrader: (7)

Well, the 12 bolt had a HEAVY Spohn Drag bar opposed to a Jay's light bar, and the strange brakes are lighter than the Aerospaces, both advantages toward the fabbed 9".

Also, a steel spool in the 12 bolt versus an aluminum in the 9".

I believe spool for spool, brakes for brakes, and rollbar to rollbar, the 12 bolt will be lighter. IMHO

Good info Brady.

Matt D

iTrader: (49)

I am gonna have to agree with you on this one Fern. You have to take into consideration all of those things. You can get a Strange 12 bolt with all of the lightweight stuff for less money and it is gonna be less weight.

Ben R

The 9" is far superior in terms of gear selection and parts availabilty should you break anything at the track.

Damage Inc.

iTrader: (7)

True. However, I feel weight is the main subject.

y2khawk

iTrader: (5)

Weigh that Moser TA bracket, it's nearly 15 lbs itself

I had thought about fabing something lighter, but never got around to it.

Ben R

Parts availabilty and gear selection are far more important that 10 or 20 lbs.

Damage Inc.

iTrader: (7)

I'll take my 4.10 gear and less weight.

But, I know what you're saying.

Brady

iTrader: (3)

FWIW, the aerospace and the strange rear brakes probably weigh nearly the same. The 9" has a steel spool in it too (although lightened)

I don't know what the spohn sway bar weighs, but it looks beefy. The Billingsley anti-roll bar is pretty lightweight (But I broke my last one) I may get ambitious and pull the spohn bar off and weigh it.

MADMAN

iTrader: (4)

The problem guys is you are comparing apples and oranges. The 9" Ford race ready and a 12 bolt race ready are worlds apart.

In a lite weight medium hp car I would definitely run a 12 bolt. In a car that makes HP needs a 9". You need to compare 9" to 9" and 12 bolt to 12 bolt.

Brady

iTrader: (3)

I agree, but the question came about in this thread: https://ls1tech.com/forums/drag-racing-tech/267733-billingsley-fab-9-weights-broken-down.html

jshiver

iTrader: (6)

what would you consider a "medium" hp car?
Does BBC /glide with brake and 2 stages of nitrous = 9" or 12 bolt?
I am new to this, but don't want to make a COSTLY mistake...Thanks

Brady

iTrader: (3)

9", In my opinion.