The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1960 - 1966 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-22-2015, 11:22 PM   #1
dragn91
Registered User
 
dragn91's Avatar
 
Join Date: Aug 2007
Location: charlestown maryland
Posts: 272
anyone run a newer rear in there c10?

I came across a 02 ish tahoe in the junkyard didn't think much of it until I seen the police written on the doors only thing left is the rear end and body parts and I checked the rear it's posi and they want 300 for it but I think I can talk them down a bit. Anyone run these or a similar rear in there truck? It was missing the brakes I'm assuming it's a disc brake rear but I'm not 100 percent sure. Are These Pretty Decent rears? I didn't have a tape measure on me so I'm going to go back if it's around the same width if so I'm probally gona try to get it. My rear is on its last leg and it's an open rear plus I just did a flip kit today but didn't weld the perches on yet (not driving it) so it be a good time to swap in a better rear. I'm not concerned with all the old coil spring brackets and stuff on the tahoe I'll just torch them off and weld the perches on I was just wondering if these are a decent swap and not like a foot wider or something. If it won't work what's a good donor rear?
dragn91 is offline   Reply With Quote
Old 08-23-2015, 12:08 AM   #2
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
Re: anyone run a newer rear in there c10?

That differential will be a 8.6" 10 bolt and will be at least 2.75" wider than the differential you currently have. I'm not sure on the exact width. Strength wise, it should be fine. It will also have Metric wheel studs, so you will need different lug nuts.

As for other differentials to use, the '63 to early '70 12 bolts are the same width of 62". The late '70 to '86 in the C/K10 series and '87-'91 R/V1500 series differentials will be 1.5" wider at 63.5". The '88-'98 C/K1500 series differentials will be 2.75" wider at 64.75".

When you measure that differential, you will want to measure WMS to WMS (Wheel Mounting Surface). That is the dimension that matters. Measuring backing plate to backing plate as many do is highly inaccurate.
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE

Last edited by Captainfab; 08-23-2015 at 01:12 AM. Reason: Added measurements
Captainfab is offline   Reply With Quote
Old 08-23-2015, 01:04 AM   #3
scum1
Registered User
 
scum1's Avatar
 
Join Date: Apr 2010
Location: las vegas
Posts: 299
Re: anyone run a newer rear in there c10?

Interested in what you find out. I have been contemplating a new (to me) posi for a long time from a donor. Just never pulled the trigger. Post up some measurements for the rest of us!
scum1 is offline   Reply With Quote
Old 08-23-2015, 01:16 AM   #4
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
Re: anyone run a newer rear in there c10?

A differential I almost forgot about is the mid 2000's Colorado/Canyon differential. They are 6 lug and I believe measure 61". Member Oklahomaduner put one in his '66 GMC.
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
Captainfab is offline   Reply With Quote
Old 08-23-2015, 08:46 AM   #5
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,731
Re: anyone run a newer rear in there c10?

One more thing to look at with newer rearends.
They might be 6 bolt but not all are 6x5.5. And the centre bore on the wheels are different.
You might need mismatched wheels on your truck.
geezer#99 is offline   Reply With Quote
Old 08-23-2015, 06:58 PM   #6
dragn91
Registered User
 
dragn91's Avatar
 
Join Date: Aug 2007
Location: charlestown maryland
Posts: 272
Re: anyone run a newer rear in there c10?

Thanks for all the info. I know the new trucks have a smaller bore I was going to have my buddy machine me some hubcentric rings so I can run my steelies if they fit over the brakes until I can find a set of the 22 inch transport wheels I want. I guess I have to see if I can fit the extra 2.75 inch width under my truck. Also came across a posi 12 bolt from a 89 fullsize blazer I'll see which one I can pick up cheaper
dragn91 is offline   Reply With Quote
Old 08-24-2015, 01:05 AM   #7
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
Re: anyone run a newer rear in there c10?

An '89 Blazer did not come with a 12 bolt, it would have come with a 8.5" 10 bolt. If it is a 10 bolt and a 'posi' it is likely a Gov Lock or as it is better known a Gov Bomb. Not something I would waste my time with.
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
Captainfab is offline   Reply With Quote
Old 08-24-2015, 09:42 PM   #8
dragn91
Registered User
 
dragn91's Avatar
 
Join Date: Aug 2007
Location: charlestown maryland
Posts: 272
Re: anyone run a newer rear in there c10?

Thanks for the tip. Maybe it was swapped in from the pics it's definitely a 12 bolt. May be a government bomb but it's not getting big hp so if it's cheap enough I don't mind
dragn91 is offline   Reply With Quote
Old 08-24-2015, 11:35 PM   #9
Mackie
Registered User
 
Mackie's Avatar
 
Join Date: Jun 2011
Location: WNC
Posts: 226
Re: anyone run a newer rear in there c10?

I think I read that earlier K5 Blazers are a good choice for 6 lug rear upgrades with only the 1.5 inch width increase. Are they truck 12 bolt style?

I'd like to find a 4.10 to go better with my Camaro WC T5 that has a high 5th gear.
__________________
`63 C-10 Shortwide
Roller 305 LT1 cam, Eddy 500
T5
Mackie is offline   Reply With Quote
Old 08-25-2015, 12:45 AM   #10
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
Re: anyone run a newer rear in there c10?

The K5 Blazers are a built on a truck platform so yes they have the truck 12 bolt, up thru 1979. After that they cam with the 8.5" 10 bolt. The truck 12 bolts are all basically the same. So unless you find one that someone has upgraded, you aren't gaining much from your original 12 bolt.
__________________
Power Steering Box Adapter Plates For Sale HERE
Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE
Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE
Hydroboost Mounting Plates HERE
Captainfab is offline   Reply With Quote
Old 08-30-2015, 08:51 PM   #11
padresag
Registered User
 
Join Date: Feb 2008
Location: Sidney,b.c.
Posts: 4,425
Re: anyone run a newer rear in there c10?

i have an 87 3/4t rear axle 14 bolt here that I just measured at about 66 3/8"
ron
padresag is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:50 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com