anyone running a 10.5" ring gear 14 bolt differential

grumpyvette

grumpyvette

Administrator
Staff member
these rear differentials from the 3/4-1 ton pick-up trucks & axles may be heavy but they are dirt cheap and nearly bullet proof in stock form

http://en.wikipedia.org/wiki/10.5%22_Co ... fferential

http://www.pirate4x4.com/tech/billavist ... index.html

https://www.4wdfactory.com/store/produc ... tial-Cover

http://www.carcraft.com/techarticles/cc ... ewall.html

http://www.4wheeloffroad.com/techarticl ... to_01.html

http://www.pirate4x4.com/tech/14bolt/index.html

http://www.drivetrain.com/parts_catalog ... rsion.html

http://www.lmctruck.com/features/csb/CSBDFT.htm

http://www.4wheelnoffroad.com/axle.html

http://www.facebook.com/pages/105-Corpo ... 3740070151

10.5” Corporate 14 Bolt Differential is a heavy duty differential that is used by Chevrolet and GMC trucks and vans since 1973.. This differential is of the full floating design and has a ring gear with a diameter of 10.5 inches (270 mm). As the name implies, this differential has 14 bolts holding on the differential cover. The ring gear is not held on with 14 bolts, but rather 12.
General specifications

10.5” diameter ring gear
Axles are 30 spline axles
1.590” diameter shank on the pinion
Gear ratios: 3.21, 3.42, 3.73, 4.10, 4.56, 4.88, 5.13, and 5.38
Carrier break: 3.21:1 - 4.11:1 and 4:56 - 5.38
1.50” axle spline diameter
1.34” axle shaft diameter
Axles are different lengths from side to side
Pinion supported with bearings on both sides of the teeth which minimizes pinion deflection
Removable pinion support
Weight: 550 pounds (250 kg)
GAWR: 8,600 pounds (3,900 kg) Max.

Design

The first design was produced from 1973 to 1985. The first design remained unchanged until 1986. This design had drums that were held on by the wheel studs and had a smaller diameter pinion bearing than the second design. The second design was produced from 1986 to present. One change that occurred in the second design was that on some models the brake drum could be removed without having to remove the hub and axle shaft. Additionally, the pinion received a larger diameter bearing while the pinion stayed the same diameter, which increased the durability of the pinion. All these axle are full floating.
 
I am familiar with the GM 14-bolt 3/4 ton & 1 -ton axle Grumpy.
Its a huge & very heavy rear differential.
I would not go so far as say its bullet proof though. I have seen failures & have had to rebuild them in fleet service box van trucks & 4X4's with 35 inch & taller tires.
I still think the Dana 60 Rear differential is SUPERIOR for drag racing use as you & others like.
What makes an Dana 60 so tough is not only the large 9-3/4 inch ring gear diameter, ITS the extremely stiff NODULAR Iron Center cast Housing. Very thick material & Very well engineered & strategically placed reinforcing ribs.
If the housing is super stiff, very little or NO inherent flexing can take place under extreme High Torque shock loads on drag race style launches.
Housing flex, not axle tubes bending temporary, causes the ring & pinion to go momentarily out of alignment, gear tooth nomeclature contact pattern is severely compromised. Eventually the BANG.....
That's if an axle shaft does not fail 1st, differential cast iron posi carrier, spider gears, or the pinion gear shaft does not snap free from the pinion gear head.

BR
 
A Chevrolet 12-bolt 8-7/8" inch diameter ring gear, 1.625 Inch pinion diameter, Type "C" rear differential can be built to withstand 1200 HP nitrous oxide launches on a 10 inch wide rear tire running high 8's 1/4. I have built them. Only production parts I use are the original GM 1965 to 1972 Chevelle, GTO, Camaro, 1970 Firebird Trans Am housing & companion flange yoke.
All aftermarket parts otherwise used.
Posi traction only usefull for lightweight under 3,000lb cars running 11's & into high 10's.
Spool required for Big HP & Torque over 750 HP.
Aftermarket 33- spline axles. Strange Engineering High Tuff Alloy race axle preferred. Moser OK too.
Very precise blueprinting required.
Only perfection in setup work will ensure longevity & customer - racer satisfaction.

BR
 
Read all rear differential threads/ posts here Grumpy.
GTR1999 knows his stuff with C2 & C3 Corvette 10 & super10's & Super 12 builds.

Ford 9 inch not as strong as many would believe it is in stock production form.
Most production 9 inches used plain cast iron 3rd members & 2.891" inch diameter carrier bores.
Best used under Super Cobra Jet Mustangs 428's & 429's & Torinos. Nodular iron center section, 3.0625" inch carrier bore.
They also made a Ford 9-3/8" inch rear, used in Lincoln Mark 4's 1972- 1976, 460 V8's. 3.250" inch diameter carrier bore. Real odball & have had them around too.

Of course aftermarket has beefed up the Ford 9 inch to withstand fast 7- second door slammers around the USA & worldwide today.
But you need to spend at least $1500 to build a a Ford 9 inch as strong as a production 1966- 1972 Dodge B body Dana 60 Posi equipped factory rear.
 
A often overlooked & never heard of production car rear is the 1957-64 Pontiac Olds 9.300" ring gear diameter rear.
Big like a Dana 60. Drop out 3rd member like a Ford 9 inch. Extremely strong like a Dana 60.
Tapered axle housing tubes necking down to 3/14" inch OD at smallest point.
Used in the early days of 1960's & into 1970's 8-second Nitro Funny cars & Nitro rails & by many hotrodders.
Big Ball bearings on each axle shaft 9.3 Pontiac Olds, what modern Ford 9 inch guys upgrade to from stock with big spline 33 or 35 aftermarket axle shafts.

My own preference for a rear diff for my own cars.
Factory gear ratios from 2.56 to 6.14 & positraction. Detroit lockers were produced, spools, even a Gleason Torsion all gear limited slip posi unit.

Expensive rearend to buildup today but its very strong & famous for its longevity under very brutal drag racing punishment.

BR
 
The next performance rear differential build I do Grumpy, I will start a new thread here on your Forum.
It may be one of mr own 1957 - 64 9.300 Pontiac Olds Rears. What I plan on installing into my 87 c4 vert with a custom 4 link rear. Its been pretty slow sidework building diffs. End of racing season here in the midwest. So nothing current to share here with others.
 
http://www.pirate4x4.com/tech/billavista/PR-ARB/articles/14b_Gear_Setup/

http://www.demandaam.com/resources/pdf/file-20150608153906.pdf

http://www.differentials.com/technical-help/differential-identification

http://www.pirate4x4.com/tech/billavista/14b_bible/

http://www.crawlpedia.com/ring_pinion_setup.htm

I just did a VERY quick look in the ARP catalogue and they list studs for a Ford 8" and Ford 9". Not even 1 single GM carrier stud.

These are specs for a 10.5 Full Float GM rear It states 135 lb/ft, for the 10.5" FF so this would support the above specs for a 9.5" SF with cap torque specs of 63 lb/ft. Your bolts saw around double their torque spec, here are some failure pics to compare.
http://arp-bolts.com/pages/technical_failures.shtml

Pinion Bearing Preload
(Inch lbs) 25 - 35 (new bearings)

5-15 (reused bearings)

Preferred Backlash
(.001 inch) 5 - 8
Ring Gear Bolt Torque
(Foot lbs) 120
Bearing Cap Torque
(Foot lbs) 135
Pinion Nut Torque Tighten as necessary to obtain correct preload
Pinion Bearing Retainer Torque
(Foot lbs) :65
Diff Cover Bolt Torque
(Foot lbs) 35
Axle shaft flange Bolt Torque
(Foot lbs) 115
Spindle Nut Torque
(Foot lbs) 50
Carrier Adjuster Ring Lock Bolt Torque
(Foot lbs) 20
Pinion Assembly Bolt Torque
(Foot lbs) 65
Axle Shaft Spline Length
(inches) 2.165" total
Axle Shaft Engaged Spline Length
(inches) short side 1.418"
Axle Shaft Engaged Spline Length
(inches) long side 1.569"
Axle Tube Dimensions
(inches) 3-3/8" x 0.5" thick
Spring Perch Span and Width
(inches) (1980 1 Ton 4x4, SRW, non Cab and Chasis) 42.5" x 2.5"
Axle Shaft Length
(inches) Right 37-5/8"
Left 31-5/8"
Axle Shaft Diameter
(inches) @ splines 1.54", @ neckdown 1.367", operating diameter 1.351"
@ flange 1.458"

30 splines

Axle Flange Bolt Pattern
8 on 3.523", 1/2" holes, bolts are 1/2-NC13x1.5"
Pinion Yoke U-joint Strap Bolts
7/16 " head, 1.296" x 5/16-NF24
Diff Cover Bolts
Fourteen (14) 3/8-NC16 x 3/4"
Ring Gear Bolts
Twelve (12) 9/16-NF18
Pinion Nut Size 1.5"
Axle shaft to Hub bolts 3/4" head, 1/2-NC13, approx. 1.5" long

Ring Gear Diameter
10.5"
Pinion diameter
1.750" x 30 splines
Carrier Break
4.10 / 4.56
Approximate Weight
(lbs) 550 with brake drums
450 without brake drums
Width - WMS-WMS
(inches) SRW/DRW 67"
C&C DRW 63"


The 10.5" carrier main bearing bolt part number is 331422.

The 9.5" SF carrier main bolt p/n is 14012675. With specs of M12X1.75X74

I cris referenced this with a 3/4 ton G-Van, a 3/4 ton Burb and a C2500 truck and all the 9.5" bolts from 3 different diagrams come up with the M12X1.75X74 p/n14012675.

http://www.gm-trucks.com/forums/index.php?showtopic=73552

Fastener Tightening Specifications
Application
Specification

Metric
English

Axle Flange Bolt (10.5 Inch Axle)
156 N·m
115 lb ft

Axle Flange Bolt (11.5 Inch Axle)
185 N·m
136 lb ft

Bearing Cap Bolt (8.6 Inch Axle)
75 N·m
55 lb ft

Bearing Cap Bolt (9.5/9.5 Inch LD Axles)
85 N·m
63 lb ft

Bearing Cap Bolt (10.5 Inch Axle)
185 N·m
136 lb ft

Bearing Cap Bolt (11.5 Inch Axle)
207 N·m
153 lb ft

Brake Backing Plate Bolt
135 N·m
100 lb ft

Brake Hose Bracket Bolt
22 N·m
16 lb ft

Brake Pipe Bracket to Rear Axle Bolt
22 N·m
16 lb ft

Brake Pipe Bracket to Rear Axle Nut
13 N·m
115 lb in

Brake Pipe Junction Block Bolt
22 N·m
16 lb ft

Differential Bearing Adjuster Nut Lock Bolt (9.5/9.5 Inch LD Axles)
26 N·m
19 lb ft

Differential Bearing Adjuster Nut Lock Bolt (10.5 Inch Axle)
27 N·m
20 lb ft

Differential Bearing Adjuster Nut Lock Bolt (11.5 Inch Axle)
27 N·m
20 lb ft

Fill Plug
33 N·m
24 lb ft

Flex Hose Bracket Bolt
12 N·m
106 lb in

Pinion Gear Bearing Retainer Bolt (10.5 Inch Axle)
88 N·m
65 lb ft

Pinion Shaft Lock Bolt (8.6 Inch Axle)
36 N·m
27 lb ft

Pinion Shaft Lock Bolt (9.5/9.5 Inch LD Axles)
50 N·m
37 lb ft

Propeller Shaft Yoke Retainer Bolt
25 N·m
18 lb ft

Rear Axle Housing Cover Bolt
40 N·m
30 lb ft

Ring Gear Bolt (8.6 Inch Axle)
120 N·m
89 lb ft

Ring Gear Bolt (9.5/9.5 Inch LD Axle)
140 N·m
103 lb ft

Ring Gear Bolt (10.5 Inch Axle)
165 N·m
122 lb ft

Ring Gear Bolt ( 11.5 Inch Axle)
237 N·m
175 lb ft

Shock Absorber Nut - Lower
95 N·m
70 lb ft

Stabilizer Shaft Link Bolt
95 N·m
70 lb ft

Stabilizer Shaft U-bolt Nut
32 N·m
24 lb ft

U-bolt Nut
72 N·m
53 lb ft

U-bolt Nut (25/35 Series)
150 N·m
110 lb ft

Wheel Hub Nut (10.5/11.5 Inch Axles)
70 N·m
52 lb ft

Tighten the wheel lug nuts
190 N·m
140 lb ft


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