6 lug 12 bolt rear

**deadsled** · 12-11-2010, 06:31 AM

does anybody know if there are any 2wd 6lug 12 bolt rearends out there ?

**DressedToKill** · 12-11-2010, 08:09 PM

If you're asking for a 12 bolt with a 6 on 5.5 pattern, then yes, many.

**deadsled** · 12-12-2010, 03:42 AM

what trucks are they in ?

**Badass69** · 12-12-2010, 06:46 AM

1964-1982 GM 1/2 ton trucks. So 1964-1970 were all 6X5.5. Starting in 1971 the 2wd trucks are 5X5" but the 4 wheel drives carried on as the 6X5.5" configuration for the rest of the differentials duration. A lot of the early versions were on coil sprung trucks as well, so consider that as you won't have leaf spring perches on the differential, if that matters to you.

**deadsled** · 12-12-2010, 08:22 AM

ok thanks for the info all i need is 6 lug axles i can just swap my 5lug out into my 12bolt

**Quyonmob** · 12-12-2010, 08:26 AM

Why do you want a 12 bolt swap?

**Badass69** · 12-12-2010, 08:50 AM

Originally Posted by deadsled

ok thanks for the info all i need is 6 lug axles i can just swap my 5lug out into my 12bolt

You have to watch with that. Measure your axles beforehand. I know in the 67-72 era and earlier the 1970 model housing is the same width as the 71/72 housing so it's plug and play but the 69 and older housings are narrower. If this is in a 73 and up truck I don't know what widths interchange if at all.

**deadsled** · 12-12-2010, 08:51 AM

i have a 12 rear 5 lug and i want to swap the axles out with a 6lug i dont want to swap out a whole rear cause mine is fine and it would be easier to swap out axles

**Quyonmob** · 12-12-2010, 09:54 AM

Originally Posted by deadsled

i have a 12 rear 5 lug and i want to swap the axles out with a 6lug i dont want to swap out a whole rear cause mine is fine and it would be easier to swap out axles

So you want to know if you can swap in a 6 lug axleshafts to your current 5 lug 12 bolt axle? Measure WMS to WMS on the donor to be sure. IIRC they are all the same spline count.

**jimmy_dong** · 12-12-2010, 02:47 PM

dont forget about axle shaft diameter.

**Quyonmob** · 12-12-2010, 04:59 PM

I thought truck 12 bolts were almost all the same axle shaft diameter?

**Badass69** · 12-12-2010, 05:14 PM

Originally Posted by jimmy_dong

dont forget about axle shaft diameter.

Shafts are all the same diameter regardless from inception to the last year of production. The only difference anywhere with regards to this kind of thing is that the 1964 year model year axles are 17 spline and then they went 30 spline in 1965 and up.