9 bolt strength?
9 bolt strength? Anyone know the torque rating the Australian 9 Bolt Rear? I've checked with 9bolt.com but didnt see anything in the FAQ, sent them an e-mail, thought I would check with you guys now.
Chris
Chris
TECH Senior Member
Joined: Apr 2004
Posts: 6,157
Likes: 1
From: Texas
Originally Posted by NitrousJunkie
Anyone know the torque rating the Australian 9 Bolt Rear? I've checked with 9bolt.com but didnt see anything in the FAQ, sent them an e-mail, thought I would check with you guys now.
Chris
Chris
Not sure about the strength of a australian rear but the strength depends on the differential (3rd member) spool, locker, posi...
It is stronger than a 7.5, but not a huge difference. Not as strong as a 8.5 thats for sure. The only aftermarket gear available is a 3.70, plus you can get a bearing kit, but no cases.
TECH Resident
Joined: Jan 2003
Posts: 855
Likes: 0
From: AUSTIN TX
Originally Posted by mzoomora
It is stronger than a 7.5, but not a huge difference. Not as strong as a 8.5 thats for sure. The only aftermarket gear available is a 3.70, plus you can get a bearing kit, but no cases.
ok cool, I didnt figure it was to strong, gear wise they sell alot now, everything from 3.27/3.42/3.73/4.10 and 5.13 but I heard the 5.13 is quote expensive, thanks again.
Chris
Chris
Trending Topics
Originally Posted by NitrousJunkie
ok cool, I didnt figure it was to strong, gear wise they sell alot now, everything from 3.27/3.42/3.73/4.10 and 5.13 but I heard the 5.13 is quote expensive, thanks again.
Chris
Chris
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Verdad Gallardo 9bolt site click here
He's running a 427 Big Block Camaro With 500 FT Lbs And a TH400 With This Rear.....
Quote From Site
"Common factory ratios were 2.77, 3.27 & 3.45, uncommon factory ratios are 3.08. After market ratios are 3.70. Ratios that I offer are 3.23, 3.45, 3.73, 3.9 & 4.10 (actually 5.13 but bring your visa card, and 3.9 is special order)"
Chris
He's running a 427 Big Block Camaro With 500 FT Lbs And a TH400 With This Rear.....
Quote From Site
"Common factory ratios were 2.77, 3.27 & 3.45, uncommon factory ratios are 3.08. After market ratios are 3.70. Ratios that I offer are 3.23, 3.45, 3.73, 3.9 & 4.10 (actually 5.13 but bring your visa card, and 3.9 is special order)"
Chris
Pretty interesting info, thanks for the link. I wonder how much of that stuff he has in stock. Those rears are pretty scarce so parts arent really in demand. That article is way off on the strength thing though. The Dana 44 is a 8.5" ring gear, and the 9 bolt isnt even close in strength.
Just trying to bump an ancient thread 
I just went to 9bolt.com and ordered a set of 4.11 gears, bearing and seal kit, and 2 new posi cones. $550 with Express shipping from Australia. I also bought a 9 bolt girdle cover and upgraded stud kit.
It was cheaper to try this than to buy a new rear. $700 vs $2000.
The way I drive this 9 bolt may hold up for quite awhile
I will keep this thread updated.
I just went to 9bolt.com and ordered a set of 4.11 gears, bearing and seal kit, and 2 new posi cones. $550 with Express shipping from Australia. I also bought a 9 bolt girdle cover and upgraded stud kit.
It was cheaper to try this than to buy a new rear. $700 vs $2000.
The way I drive this 9 bolt may hold up for quite awhile
I will keep this thread updated. 
1989 formula 350.
355 L98
-10.5:1
-AFR Eliminators
-223 230 .530 .530 109 Lloyd Elliot cam
TPiS Miniram
T56
4.11 9 bolt posi rear
Motor is at the machine shop getting freshened up now. Should have it back soon. Then to the Dyno :-D Looking for 385ish RWHP and 380ish RWTQ.
355 L98
-10.5:1
-AFR Eliminators
-223 230 .530 .530 109 Lloyd Elliot cam
TPiS Miniram
T56
4.11 9 bolt posi rear
Motor is at the machine shop getting freshened up now. Should have it back soon. Then to the Dyno :-D Looking for 385ish RWHP and 380ish RWTQ.
if a 10 bolt can handle 350 that can handle 390, if a 10 bolt can handle 300 9 bolt can handle 350. that would be my guess, hope it made sense..
7.5 ring gears have broken at stock power (10 bolt)
8.875 ring gears have broken at 450rwhp (12 bolt)
these have 7.75 ring gears so take you guess
(these numbers are on the LOW end of the spectrum)
7.5 ring gears have broken at stock power (10 bolt)
8.875 ring gears have broken at 450rwhp (12 bolt)
these have 7.75 ring gears so take you guess
(these numbers are on the LOW end of the spectrum)
