'74 Rear Axle Application - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Alex V. · 01-12-2014, 06:33 PM

The '74 K10 I bought last fall has had the rear axle swapped to an 8-lug, full-floating 14-bolt - FWIW, the front is a 6-lug Dana 44. The truck was originally a 454/auto with HD springs - would this have come with a 10 bolt from the factory, or a 12 bolt semi-float 6-lug? Also, as far as spring perches, shock mounts, etc. go, will a 10 or 12 bolt axle out of any 73-87 10 or 20 series truck bolt up to the K10 rear suspension?

Alex V. · 01-15-2014, 03:20 AM

Any ideas?

Mattchu60 · 01-15-2014, 09:47 AM

If it was a 74' K10, you would have had the factory 12 bolt semi-floater when it was new. They started using the 10-bolt rear later on (don't know when). I believe any year 12 bolt should fit, just make sure the gear ratios match the front axle.

Alex V. · 01-15-2014, 12:38 PM

Right on. Thanks!

ElGracho · 01-15-2014, 03:34 PM

The shock mount brackets are different between a 2wd and 4x4 axle. It's only a slight difference.

Also, the axle lengths are slightly different between the 2wd and 4x4. I've interchanged them in the past and it seemed to work ok.

Alex V. · 01-16-2014, 03:19 AM

Good to know. If I do find a possibly swap-able axle I'll compare/measure.

ElGracho · 01-16-2014, 08:09 AM

Check out this thread/post:

http://67-72chevytrucks.com/vboard/s...6&postcount=19

Alex V. · 01-16-2014, 03:20 PM

Ah! I see. Good to know. The mount holes for the shock studs on the frame have been moved down about 3 in. - maybe they figured out after the swap that the mounts are different, but compensated on the other end.

01-12-2014, 06:33 PM	#1
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	'74 Rear Axle Application The '74 K10 I bought last fall has had the rear axle swapped to an 8-lug, full-floating 14-bolt - FWIW, the front is a 6-lug Dana 44. The truck was originally a 454/auto with HD springs - would this have come with a 10 bolt from the factory, or a 12 bolt semi-float 6-lug? Also, as far as spring perches, shock mounts, etc. go, will a 10 or 12 bolt axle out of any 73-87 10 or 20 series truck bolt up to the K10 rear suspension? __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

01-15-2014, 03:20 AM	#2
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: '74 Rear Axle Application Any ideas? __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

01-15-2014, 09:47 AM	#3
Mattchu60 Registered User Join Date: Jan 2014 Location: Swaledale, IA Posts: 485	Re: '74 Rear Axle Application If it was a 74' K10, you would have had the factory 12 bolt semi-floater when it was new. They started using the 10-bolt rear later on (don't know when). I believe any year 12 bolt should fit, just make sure the gear ratios match the front axle.

01-15-2014, 12:38 PM	#4
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: '74 Rear Axle Application Right on. Thanks! __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

01-15-2014, 03:34 PM	#5
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,550	Re: '74 Rear Axle Application The shock mount brackets are different between a 2wd and 4x4 axle. It's only a slight difference. Also, the axle lengths are slightly different between the 2wd and 4x4. I've interchanged them in the past and it seemed to work ok. __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

01-16-2014, 03:19 AM	#6
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: '74 Rear Axle Application Good to know. If I do find a possibly swap-able axle I'll compare/measure. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

01-16-2014, 08:09 AM	#7
ElGracho Gentleman Jim Driver Join Date: Nov 2002 Location: Poulsbo, WA Posts: 1,550	Re: '74 Rear Axle Application Check out this thread/post: http://67-72chevytrucks.com/vboard/s...6&postcount=19 __________________ Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed

01-16-2014, 03:20 PM	#8
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: '74 Rear Axle Application Ah! I see. Good to know. The mount holes for the shock studs on the frame have been moved down about 3 in. - maybe they figured out after the swap that the mounts are different, but compensated on the other end. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.



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