Axle Years? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1STtimePRo'71 · 10-20-2005, 06:20 PM

Just curious as to what the running years of the 12 and 14 bolt rearends came in. I'm assuming that the 14 bolt is the 3/4 ton version and the 12 bolt as the 1/2 ton version. But if I were to start looking for a set of axles what years would have what?

b454rat · 10-20-2005, 07:28 PM

Not too sure on the 12 bolt, but I think 64 up to 77 or so. 14 bolt Full Floater came out in 73 when the that body style was introduced in both 3/4 and 1 ton. In '81 the Semi Floater was in light duty 3/4 tons. The heavy 3/4 and 1 tons used the full floater. I think they are still used in the new trucks, but not sure, I can't afford one, so I don't look!!

**JIMs70GMC** · 10-20-2005, 08:55 PM

As was said. In addition, the 10 bolt replaced the 12 bolt in the 1/2 tons, and in some regards is stronger than the 12 bolt truck version, something to do with pinion size. The newer "14 bolts" also come in a 11.5" ring gear size i believe. Also on the 14 bolts some time in the 80s things changed and parts are not interchangeable (spindles/drums).

toroflow · 10-21-2005, 01:44 PM

12 bolts were used up to 1981, thereafter it was 10 bolts for 1/2 tons. 14 bolt semi-float came in 1981....full float 14s in 1973. They are still using both 14 bolts to this day.

Dean · 10-21-2005, 03:00 PM

Two different 14 bolts. 10.5 or 9.5 ring gear size. Completely different. I just ran into this when ordering a locker for my 87 K30 which is the 10.5"

1STtimePRo'71 · 10-21-2005, 07:59 PM

So If I wanted to swap in a 14 bolt rearend for the ho52 in my 71 I should use 10.5 or the 9.5 ring gear? I'm assuming that the 10.5 would be better suited for my 3/4 ton truck right?

**JIMs70GMC** · 10-21-2005, 09:15 PM

Yep the 9.5" is more of a light duty 3/4 ton. The 10.5" is what the h052/h072 evolved into in 1973. Also look for a 1 ton 14b as they have their spring perch spacing right on for our trucks (40" to 40.5") the 3/4 tons are like 42" apart and will need to be moved. Also the 10.5" is a full floater the 9.5" is like the 10 and 12 bolts, and uses c-clips. Also detroit lockers for a 10.5' 14b are around $350, the 9.5" is like $650 and requires more work to install.

blazingmiracle · 10-26-2005, 08:29 PM

Sorry blazingmiracle. You must be a subscriber to the board to post wanted parts or for sale items and they must be done on the for sale forums.

1967k30 · 10-28-2005, 01:09 PM

Or you can get an 01'+ 11.5" 14bolt {AAM 11.5} They have factory disc's.I'd just keep the h052 though.Locker selection for AAM's isn't yet though

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10-20-2005, 06:20 PM	#1
1STtimePRo'71 Registered User Join Date: Feb 2005 Location: Lake Crystal, MN Posts: 656	Axle Years? Just curious as to what the running years of the 12 and 14 bolt rearends came in. I'm assuming that the 14 bolt is the 3/4 ton version and the 12 bolt as the 1/2 ton version. But if I were to start looking for a set of axles what years would have what? __________________ -Cory 1967 2 Wheel Chevy

10-20-2005, 07:28 PM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,454	Re: Axle Years? Not too sure on the 12 bolt, but I think 64 up to 77 or so. 14 bolt Full Floater came out in 73 when the that body style was introduced in both 3/4 and 1 ton. In '81 the Semi Floater was in light duty 3/4 tons. The heavy 3/4 and 1 tons used the full floater. I think they are still used in the new trucks, but not sure, I can't afford one, so I don't look!! __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS

10-20-2005, 08:55 PM	#3
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: Axle Years? As was said. In addition, the 10 bolt replaced the 12 bolt in the 1/2 tons, and in some regards is stronger than the 12 bolt truck version, something to do with pinion size. The newer "14 bolts" also come in a 11.5" ring gear size i believe. Also on the 14 bolts some time in the 80s things changed and parts are not interchangeable (spindles/drums). __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

10-21-2005, 01:44 PM	#4
toroflow Registered User Join Date: May 2005 Location: Anaheim, CA Posts: 103	Re: Axle Years? 12 bolts were used up to 1981, thereafter it was 10 bolts for 1/2 tons. 14 bolt semi-float came in 1981....full float 14s in 1973. They are still using both 14 bolts to this day. __________________ Ken '60 GMC 3/4T 4x4 '60 GMC Suburban 4x4 '64 GMC Suburban 4x4

10-21-2005, 03:00 PM	#5
Dean Senior Member Join Date: Jan 2000 Location: Cincinnati, Ohio Posts: 1,492	Re: Axle Years? Two different 14 bolts. 10.5 or 9.5 ring gear size. Completely different. I just ran into this when ordering a locker for my 87 K30 which is the 10.5"

10-21-2005, 07:59 PM	#6
1STtimePRo'71 Registered User Join Date: Feb 2005 Location: Lake Crystal, MN Posts: 656	Re: Axle Years? So If I wanted to swap in a 14 bolt rearend for the ho52 in my 71 I should use 10.5 or the 9.5 ring gear? I'm assuming that the 10.5 would be better suited for my 3/4 ton truck right? __________________ -Cory 1967 2 Wheel Chevy

10-21-2005, 09:15 PM	#7
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: Axle Years? Yep the 9.5" is more of a light duty 3/4 ton. The 10.5" is what the h052/h072 evolved into in 1973. Also look for a 1 ton 14b as they have their spring perch spacing right on for our trucks (40" to 40.5") the 3/4 tons are like 42" apart and will need to be moved. Also the 10.5" is a full floater the 9.5" is like the 10 and 12 bolts, and uses c-clips. Also detroit lockers for a 10.5' 14b are around $350, the 9.5" is like $650 and requires more work to install. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

10-26-2005, 08:29 PM	#8
blazingmiracle Registered User Join Date: Oct 2005 Location: CA Posts: 2	Re: Axle Years? Sorry blazingmiracle. You must be a subscriber to the board to post wanted parts or for sale items and they must be done on the for sale forums. Last edited by Mudder; 10-27-2005 at 05:44 AM.

10-28-2005, 01:09 PM	#9
1967k30 Senior Member Join Date: Sep 2005 Location: NE Posts: 363	Re: Axle Years? Or you can get an 01'+ 11.5" 14bolt {AAM 11.5} They have factory disc's.I'd just keep the h052 though.Locker selection for AAM's isn't yet though . __________________ 01 2500 Duramax,6spd,4x4,Not stock. Estimated 550rwhp/1100rwfp on fuel only. 03 3500 Duramax,6spd,4x4,Pac-Brake,not stock Estimated 500rwhp/1000rwfp fuel only 67 K10 in many pieces Little Brothers truck 67 K20 Cummins 12V/NV4500/205, D60/Eaton w/ Detroit,37" Xterrains,crossover steering, Future plans,Twins and lots of fuel.



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