Click here to visit LS1Tech
Click here to visit Performance Trucks
Click here to visit Mod Motor Tech
Click here to visit Modern Hemi

PerformanceTrucks.net Forums  

Go Back   PerformanceTrucks.net Forums > GENERAL MOTORS SPECIFIC FORUMS > GM Engine & Exhaust Performance
Sign in using an external account
Register Forgot Password?

Welcome to Performance Trucks!
Welcome to Performance Trucks,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 02-23-2005, 02:07 AM   #1
Trader Rating: 8
what a rush!
 
moregrip's Avatar
 
Join Date: Feb 2004
Location: Los Angeles, CA
Posts: 17,088
Default 10.5" 14 bolt 6 lug conversion

for those that want something stronger than a 6 lug 10bolt

this converts a 10.5" 14bolt to a six lug
http://www.tomsdifferentials.com/cat129.htm
__________________
Always a Project Truck, Short Step Side 250 inline 6, 2wd, 3spd manual, 12bolt
moregrip is offline   Reply With Quote
Old 02-23-2005, 03:36 AM   #2
Trader Rating: 0
TECH Addict
 
Yelo's Avatar
 
Join Date: Feb 2003
Location: Geneseo, NY
Posts: 2,864
Default

or......you could just salvage one out of an '88-'98 Z71 with a towing package.....they COME with the 10.5" SF 6-lug 14 bolt
__________________
1997 Pontiac Firebird
Green|3.8|A4|BMW 525i Wheels

- Gone, but not forgotten -
'99 ECSB 2500LD 4wd
LQ4|4L80e|VHP "044" Cam|Polished "241" LS1 Heads|Pacesetter Shorties|Custom CAI|HPTuners SD tune|Oasis Edge 20's|Magnaflow Exhaust
Yelo is offline   Reply With Quote
Old 02-23-2005, 08:03 AM   #3
Trader Rating: 1
TECH Fanatic

 
James B.'s Avatar
 
Join Date: Mar 2003
Location: 33.91 -117.48
Posts: 1,881
Send a message via AIM to James B.
Default

Quote:
Originally Posted by Yelo
or......you could just salvage one out of an '88-'98 Z71 with a towing package.....they COME with the 10.5" SF 6-lug 14 bolt
Well, no, not actually. There never was a 10.5" 6-lug rear. All 10.5" are full-floater 8-lug.
The 9.5" 14-bolt semi-float rear is the one you are thinking of. They came in smallblock 2500 and heavy half-ton old-body-style trucks in both 6 and 8 lug versions. In the 454SS the 9.5" came in the only 5-lug application for that axle. In NBS trucks all 9.5" rears are 8-lug.

I run a 10.5" rear converted to semi-float (but no c-clips) with 5-lug axles. It's strong enough to get the front wheels off the ground and hasn't given me a bit of trouble with 4.56 gears and an Eaton Posi. VERY strong unit.
__________________
"James B."
1998 C2500 Suburban LT: GM Crate 502/Brodix Heads/234-244cam/4L80-E/3400 TC/Gear Vendors/4.56:1 Eaton/Dual 3" and Ceramic Headers
1999 C1500 Tahoe LT
James B. is offline   Reply With Quote
Old 02-23-2005, 01:28 PM   #4
Trader Rating: 8
what a rush!
 
moregrip's Avatar
 
Join Date: Feb 2004
Location: Los Angeles, CA
Posts: 17,088
Default

Quote:
Originally Posted by James B.
Well, no, not actually. There never was a 10.5" 6-lug rear. All 10.5" are full-floater 8-lug.
The 9.5" 14-bolt semi-float rear is the one you are thinking of. They came in smallblock 2500 and heavy half-ton old-body-style trucks in both 6 and 8 lug versions. In the 454SS the 9.5" came in the only 5-lug application for that axle. In NBS trucks all 9.5" rears are 8-lug.

I run a 10.5" rear converted to semi-float (but no c-clips) with 5-lug axles. It's strong enough to get the front wheels off the ground and hasn't given me a bit of trouble with 4.56 gears and an Eaton Posi. VERY strong unit.
Seems to me like a few members could use or will soon need something stronger than the 10bolt.
__________________
Always a Project Truck, Short Step Side 250 inline 6, 2wd, 3spd manual, 12bolt
moregrip is offline   Reply With Quote
Old 02-23-2005, 01:30 PM   #5
Trader Rating: 0
TECH Addict
 
Yelo's Avatar
 
Join Date: Feb 2003
Location: Geneseo, NY
Posts: 2,864
Default

Quote:
Originally Posted by James B.
Well, no, not actually. There never was a 10.5" 6-lug rear. All 10.5" are full-floater 8-lug.
The 9.5" 14-bolt semi-float rear is the one you are thinking of. They came in smallblock 2500 and heavy half-ton old-body-style trucks in both 6 and 8 lug versions. In the 454SS the 9.5" came in the only 5-lug application for that axle. In NBS trucks all 9.5" rears are 8-lug.

I run a 10.5" rear converted to semi-float (but no c-clips) with 5-lug axles. It's strong enough to get the front wheels off the ground and hasn't given me a bit of trouble with 4.56 gears and an Eaton Posi. VERY strong unit.
My fault...I MEANT to type 9.5", and that 9.5" SF rear is more than strong enough to handle most anything yo want to throw at it
__________________
1997 Pontiac Firebird
Green|3.8|A4|BMW 525i Wheels

- Gone, but not forgotten -
'99 ECSB 2500LD 4wd
LQ4|4L80e|VHP "044" Cam|Polished "241" LS1 Heads|Pacesetter Shorties|Custom CAI|HPTuners SD tune|Oasis Edge 20's|Magnaflow Exhaust
Yelo is offline   Reply With Quote
Old 02-23-2005, 01:38 PM   #6
Trader Rating: 8
what a rush!
 
moregrip's Avatar
 
Join Date: Feb 2004
Location: Los Angeles, CA
Posts: 17,088
Default

Reading for your pleasure:

"We had to dump the Project truck's original half-ton 10-bolt rear axle. The 8-" diameter ring gear and 1330 U-joint pinion yoke were deemed not up to the task when twisted by a Duramax 6600 producing more than 600-horsepower and 900 lb-ft of torque. Without going the custom (expensive) route for a stronger replacement, we chose the GM 9- 14-bolt semi-floater for this six-lug application. Once acquiring the axle, we visited the experts at Randy's Ring & Pinion for a professional rebuild.

According to automotive writer and 4x4 guru Jim Allen, the GM 9 has a short-term output torque rating of just under 5,000 lbs-ft (vs 3,800 for the 10-bolt it replaced) and a max continuous torque rating somewhere around 1500 lbs-ft. Jim went on to say that, "In theory, a built Duramax with its massive torque multiplied by the gears will generate way more torque than that, but thank God for imperfect traction. Tire grip can be calculated, but you'd need the exact weight on the rear tires (including some extra for weight transfer from acceleration) and the rear tire radius. I calculated it roughly, getting rear weight data from a similar year Sportside truck, plugged it into the formula and found that it only would take about 260 lbs-ft of engine torque (3,000 lbs-ft as multiplied by the drivetrain) to slip your tires on pavement, figuring 2400 pounds on the rear tires (2,200 plus 10 percent for acceleration transfer) and the friction coefficient of average pavement (.8). With more weight, you'd get a higher number... and better acceleration."

Jim Allen continues, "Your maximum torque multiplication comes from multiplying the engine torque by the first gear ratio, and rear axle ratio. Using the stock Duramax torque, that would be 6,475 lbs-ft in high range and 17,480 lbs-ft in 4WD low range. As long as your traction torque doesn't get to close to the maximum capacity of the axle, you are OK. Given all the variables, you are uncomfortably close with the 10-bolt. You have an extra 1,200 lbs-ft of cushion with the 14-bolt. BTW, the 10.5 axle is rated for 6242 lbs-ft and the new 11.5 inch unit found in the 2500HD/3500 is rated for 8321 lbs-ft."
__________________
Always a Project Truck, Short Step Side 250 inline 6, 2wd, 3spd manual, 12bolt
moregrip is offline   Reply With Quote
Old 02-23-2005, 01:46 PM   #7
Trader Rating: 0
On The Tree
 
Join Date: Oct 2003
Location: Fairfield Ca
Posts: 191
Default

This guy makes new hubs for the full floater 60's, that convert them to 6 lug.

www.gradysoffroad.com
BLK6.0HD is offline   Reply With Quote
Old 02-25-2005, 12:58 PM   #8
Trader Rating: 0
TECH Resident
 
Join Date: Nov 2002
Location: CA
Posts: 765
Send a message via AIM to OOsilverado
Default

I have a set of grady's hubs on my 10.5" 14 bolt. So I know have a 6 lug full floater. I installed it in my blazer. I didnt want to deal with finding a dana 60 for my front end so I converted my rear to 6 lug. Im really happy with it. The diff must have lost at least 150 lbs when I did this. His hubs are billet and you convert to disk brakes at the same time so there is definately a weight reduction.

I doubt anyone here needs a diff that strong, but if someone wanted to go that route the end result is nice. and you do get a full floater rear end.
OOsilverado is offline   Reply With Quote
Old 02-25-2005, 01:44 PM   #9
Trader Rating: 31
14 Second Truck Club
 
Join Date: Oct 2004
Location: Chicago, Il
Posts: 2,619
Default

10.5 is a very tough rear. We sell a lot of parts for them, but usually due to aging and wear. Big strong rear, and easy to work on. Also, since it is a full floating axle the hafts only deal with rotational stresses, no the stress of the weight of the vehicle.
__________________
http://www.fquick.com/mzoomora
04 Chevrolet Z71
99 Z28 A4
mzoomora is offline   Reply With Quote
Old 03-09-2005, 12:53 PM   #10
Trader Rating: 8
what a rush!
 
moregrip's Avatar
 
Join Date: Feb 2004
Location: Los Angeles, CA
Posts: 17,088
Default

Quote:
Originally Posted by mzoomora
10.5 is a very tough rear. We sell a lot of parts for them, but usually due to aging and wear. Big strong rear, and easy to work on. Also, since it is a full floating axle the hafts only deal with rotational stresses, no the stress of the weight of the vehicle.
where do you work?
__________________
Always a Project Truck, Short Step Side 250 inline 6, 2wd, 3spd manual, 12bolt
moregrip is offline   Reply With Quote
Old 03-09-2005, 12:53 PM
PerformanceTrucks
Ford F150




Paid Advertisement
Reply

Tags
105, 14, 456, 6lug, bolt, conversion, convert, end, floater, fo, full, gm, hub, lug, rear


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 03:57 PM.

 



Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

PerformanceTrucks.net and InternetBrands, Inc. are not affiliated with the Ford Motor Company