Pre-65 vs. Post-65 Rear End ?'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SCOTI · 10-12-2008, 01:16 PM

I know some 64 & earlier trucks use a 'drop-out' style pumpkin like a F**d 9" vs. the 65 & later salsbury (sp?) style that requires the gears to be set-up internally within the housing. What does it take to get the 5-lug pattern on a 64 w/o swapping to a later housing?

I've found differing info. Since it's the weekend, I can't confirm by calling manufacturers so I thought I might check w/some of the board members & see what they've done.

Rogue 64 · 10-12-2008, 01:52 PM

I replaced my original low geared rearend with a 1968 low milage 3.73 posi.
It is identical except for the panhard rod mount.
I have since had my axles drilled to 5on5.

That was easy!

83burban · 10-12-2008, 08:04 PM

60-62 had a drop-out center
63-64 had 12 bolts with welded pan-hard bar mount and 17 spline axles
65-66 had 12 bolts with forged pan-`hard mounts (housing) and 30 spline axles

If you go aftermarket you will need to get spider gears for an earlier housing either from a junkyard to aftermarket. Also, 63 housing had backing plates pressed on so to get disc brakes you would have to weld caliper mounts on instead of bolting them on...just some fyi

SCOTI · 10-12-2008, 11:36 PM

My buddy looked under the bed & said it had a 12-bolt cover so I'm guessing it's the 12-bolt w/17-spline axles.

CPP sells a kit w/30-spline axles, drums, spider gears, gasket, & .500" studs for $500 but we'll prob snag a 68 rear 12-bolt & swap in aftermarket axles w/some local parts house 71-72 drums.

olsofti · 10-13-2008, 12:36 AM

I just redrilled my '64.Had to weld up one hole,turn down the axle hub,and used new '71 up drums from the parts store.
Unless I'm mistaken the '67 up rear end is 1 1/2" wider than a '66 down,if that matters to you.

My mistake,you are right.The 2wd 5 lug rearends are the wider ones.

SCOTI · 10-13-2008, 12:40 AM

Quote:

Originally Posted by olsofti

I just redrilled my '64.Had to weld up one hole,turn down the axle hub,and used new '71 up drums from the parts store.
Unless I'm mistaken the '67 up rear end is 1 1/2" wider than a '66 down,if that matters to you.

From what I know, the 'late' 70 year model thru 72's are the wider rear housing. Early 70 model & before are the narrower housing.

Rogue 64 · 10-13-2008, 01:15 AM

My 68 rear is the same width as a 64.
72 disk axles will not fit, I tried.

jason65 · 10-13-2008, 08:08 AM

CPP has the axles you want. You just slide them in and they come with the drums you'll need. Classic peformance products Is what it stand for. I think.

10-12-2008, 01:16 PM	#1
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,931	Pre-65 vs. Post-65 Rear End ?'s I know some 64 & earlier trucks use a 'drop-out' style pumpkin like a Fd 9" vs. the 65 & later salsbury (sp?) style that requires the gears to be set-up internally within the housing. What does it take to get the 5-lug pattern on a 64 w/o swapping to a later housing? I've found differing info. Since it's the weekend, I can't confirm by calling manufacturers so I thought I might check w/some of the board members & see what they've done. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol.** Last edited by SCOTI; 10-12-2008 at 01:57 PM.

10-12-2008, 01:52 PM	#2
Rogue 64 Ol' Blue Viking Join Date: Nov 2006 Location: north of Baton Rouge Posts: 172	Re: Pre-65 vs. Post-65 Rear End ?'s I replaced my original low geared rearend with a 1968 low milage 3.73 posi. It is identical except for the panhard rod mount. I have since had my axles drilled to 5on5. That was easy! __________________ Driving Paw-paws truck into the Sunset!

10-12-2008, 08:04 PM	#3
83burban Registered User Join Date: Feb 2008 Location: la Posts: 345	Re: Pre-65 vs. Post-65 Rear End ?'s 60-62 had a drop-out center 63-64 had 12 bolts with welded pan-hard bar mount and 17 spline axles 65-66 had 12 bolts with forged pan-`hard mounts (housing) and 30 spline axles If you go aftermarket you will need to get spider gears for an earlier housing either from a junkyard to aftermarket. Also, 63 housing had backing plates pressed on so to get disc brakes you would have to weld caliper mounts on instead of bolting them on...just some fyi

10-12-2008, 11:36 PM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,931	Re: Pre-65 vs. Post-65 Rear End ?'s My buddy looked under the bed & said it had a 12-bolt cover so I'm guessing it's the 12-bolt w/17-spline axles. CPP sells a kit w/30-spline axles, drums, spider gears, gasket, & .500" studs for $500 but we'll prob snag a 68 rear 12-bolt & swap in aftermarket axles w/some local parts house 71-72 drums. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

10-13-2008, 12:36 AM	#5
olsofti Registered User Join Date: Dec 2007 Location: Cypress Inn.Tn Posts: 135	Re: Pre-65 vs. Post-65 Rear End ?'s I just redrilled my '64.Had to weld up one hole,turn down the axle hub,and used new '71 up drums from the parts store. Unless I'm mistaken the '67 up rear end is 1 1/2" wider than a '66 down,if that matters to you. My mistake,you are right.The 2wd 5 lug rearends are the wider ones. Last edited by olsofti; 10-13-2008 at 11:57 AM. Reason: updated info

10-13-2008, 01:15 AM	#7
Rogue 64 Ol' Blue Viking Join Date: Nov 2006 Location: north of Baton Rouge Posts: 172	Re: Pre-65 vs. Post-65 Rear End ?'s My 68 rear is the same width as a 64. 72 disk axles will not fit, I tried. __________________ Driving Paw-paws truck into the Sunset!

10-13-2008, 08:08 AM	#8
jason65 Registerd User Join Date: Sep 2008 Location: Oklahoma Posts: 2,118	Re: Pre-65 vs. Post-65 Rear End ?'s CPP has the axles you want. You just slide them in and they come with the drums you'll need. Classic peformance products Is what it stand for. I think.



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