What rear end do I have? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

03BlkZ · 02-23-2020, 09:29 AM

My truck is a 70 C10 and I am current in a restoration. I am thinking about converting to.5 lug since I am having a hard time with wheel choices in 6 lug. I need to know what rear end I have so I know what axles to look for. The truck is a short bed 350 engine with 3 on the tree. Also the rear end is a 12 bolt and according to the SPID it has .373 gears.

**Ol Blue K20** · 02-23-2020, 10:00 AM

I think you answered it yourself.....12 bolt....

03BlkZ · 02-23-2020, 10:18 AM

Quote:

Originally Posted by Ol Blue K20

I think you answered it yourself.....12 bolt....

But is there a specific rear end I need to be looking for axles for or just make sure they are for the 12 bolt rear?

**Ol Blue K20** · 02-23-2020, 10:22 AM

I think you'll need your axle length, splines and for a truck 12 bolt. Others that have done the conversion will probably chime in soon.

Mike C · 02-23-2020, 10:58 AM

1970 is a changeover year. MOST have the same length axles and housing as the 71-72 but not all. If you have the longer housing you can buy 71-72 axles.

Use the search button on the board as this subject has been covered extensively. You can buy conversion axles, but the wider 71-72 housing (or 70 converted if that’s what you have) is better for fitting wheels on a stepside since a zero offset wheel centers in the sell left to right. On a fleetside it might be beneficial to have the narrower housing for running big tires on a lowered rig.

02-23-2020, 09:29 AM	#1
03BlkZ Registered User Join Date: Nov 2015 Location: Hewitt, Tx Posts: 386	What rear end do I have? My truck is a 70 C10 and I am current in a restoration. I am thinking about converting to.5 lug since I am having a hard time with wheel choices in 6 lug. I need to know what rear end I have so I know what axles to look for. The truck is a short bed 350 engine with 3 on the tree. Also the rear end is a 12 bolt and according to the SPID it has .373 gears.

02-23-2020, 10:00 AM	#2
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,008	Re: What rear end do I have? I think you answered it yourself.....12 bolt.... __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

02-23-2020, 10:22 AM	#4
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,008	Re: What rear end do I have? I think you'll need your axle length, splines and for a truck 12 bolt. Others that have done the conversion will probably chime in soon. __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man

02-23-2020, 10:58 AM	#5
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	Re: What rear end do I have? 1970 is a changeover year. MOST have the same length axles and housing as the 71-72 but not all. If you have the longer housing you can buy 71-72 axles. Use the search button on the board as this subject has been covered extensively. You can buy conversion axles, but the wider 71-72 housing (or 70 converted if that’s what you have) is better for fitting wheels on a stepside since a zero offset wheel centers in the sell left to right. On a fleetside it might be beneficial to have the narrower housing for running big tires on a lowered rig. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax



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