70' axle length question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Painter D · 11-13-2016, 07:39 PM

Ive determined that my 70 swb truck has the earlier (narrower) rearend.While theres plenty of 5 lug axle swap kits for the 5 lug conversion Im wanting to do out there ,none of them list the option for the difference between the earlier and later rearend widths. (70' was the. change over year)

How do I know which kit to order?

The axles are 30.5" long so unless Ive done my research wrong somewhere Im certain I have the narrower housing.

jmking9 · 11-13-2016, 10:49 PM

You are correct, you do have the narrower rear end that was in some 70 models. The wider axles are 31 5/16" If I remember correctly.
Here are some from Summit that will work https://www.summitracing.com/parts/c...FYMCaQodz9cNHQ
Any 5 lug conversion axles that are listed for 63-69s will work. If you have the wider 70 rear end like I have in mine, you would just buy 71-72 stock replacement axles. Hope this helps!

Painter D · 11-13-2016, 11:39 PM

If Im sticking with the drum brakes which drums are compatible with these axles from Summit?

coreyjhen · 11-14-2016, 11:31 AM

The local used auto parts dealer told me that I can use the longer axles if I also use the 2¾" brakes. I'm going to try it this winter.

**lolife99** · 11-14-2016, 01:05 PM

Quote:

Originally Posted by Painter D

If Im sticking with the drum brakes which drums are compatible with these axles from Summit?

Wouldn't the stock 71-72 braked drums work on the aftermarket axles?
I assumed that's what everyone was using.
I've never done the swap myself.

Painter D · 11-14-2016, 10:20 PM

I ordered a kit that comes with drums today, Ill keep you guys posted on how it works

Money_pit · 11-15-2016, 12:11 AM

Running into this exact situation. Gonna stay tuned in

demian5 · 11-14-2016, 11:43 AM

FWIW -

I have a narrow 6-lug axle on my 70 and I added bolt on 1 1/2" spacers and it tucked the wheels right out to the sides of the bed.

Running 15x8 stock steel wheels with 31x11.50 15 with 3" cpp drop springs and 1" block

11-13-2016, 07:39 PM	#1
Painter D Registered User Join Date: Jun 2007 Location: DFW (Forney) Posts: 1,529	70' axle length question Ive determined that my 70 swb truck has the earlier (narrower) rearend.While theres plenty of 5 lug axle swap kits for the 5 lug conversion Im wanting to do out there ,none of them list the option for the difference between the earlier and later rearend widths. (70' was the. change over year) How do I know which kit to order? The axles are 30.5" long so unless Ive done my research wrong somewhere Im certain I have the narrower housing. __________________ '58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5

11-13-2016, 10:49 PM	#2
jmking9 Registered User Join Date: Sep 2006 Location: Riverton KS Posts: 832	Re: 70' axle length question You are correct, you do have the narrower rear end that was in some 70 models. The wider axles are 31 5/16" If I remember correctly. Here are some from Summit that will work https://www.summitracing.com/parts/c...FYMCaQodz9cNHQ Any 5 lug conversion axles that are listed for 63-69s will work. If you have the wider 70 rear end like I have in mine, you would just buy 71-72 stock replacement axles. Hope this helps! __________________ 1970 SWB Build Last edited by jmking9; 11-13-2016 at 10:54 PM.

11-13-2016, 11:39 PM	#3
Painter D Registered User Join Date: Jun 2007 Location: DFW (Forney) Posts: 1,529	Re: 70' axle length question If Im sticking with the drum brakes which drums are compatible with these axles from Summit? __________________ '58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5

11-14-2016, 11:31 AM	#4
coreyjhen Registered User Join Date: Nov 2016 Location: Albuquerque, NM Posts: 110	Re: 70' axle length question The local used auto parts dealer told me that I can use the longer axles if I also use the 2¾" brakes. I'm going to try it this winter.

11-14-2016, 10:20 PM	#6
Painter D Registered User Join Date: Jun 2007 Location: DFW (Forney) Posts: 1,529	Re: 70' axle length question I ordered a kit that comes with drums today, Ill keep you guys posted on how it works __________________ '58 SWB Fleetside...Front & Rear Porterbuilt Dropmember, 6.0 LS /4L60E. Accuair E-level, 20 Billet Specialties (Vintecs) '63 Buick Riviera ... AccuAir E-level, 20" Billet Specialties (Vintecs) http://67-72chevytrucks.com/vboard/s...=528853&page=5

11-15-2016, 12:11 AM	#7
Money_pit Registered User Join Date: Jan 2014 Location: Illinois Posts: 131	Re: 70' axle length question Running into this exact situation. Gonna stay tuned in __________________ 71 C10 Finally took a leap and did the 5.3 4l80e swap. Running the Holley Terminator Xmax. Still working bugs out.

11-14-2016, 11:43 AM	#8
demian5 Registered User Join Date: Aug 2016 Location: Lake Forest, CA Posts: 2,177	Re: 70' axle length question FWIW - I have a narrow 6-lug axle on my 70 and I added bolt on 1 1/2" spacers and it tucked the wheels right out to the sides of the bed. Running 15x8 stock steel wheels with 31x11.50 15 with 3" cpp drop springs and 1" block __________________ "Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC



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