Which Rear Differential?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DBear · 11-05-2011, 05:57 PM

Anyone know what years and what models have a 3.73 rear diff, that would swap into my '64 Chevy 4x4 Burb? I would like to find something that bolts up with no problems?

Dunenutt · 11-05-2011, 06:19 PM

The 10 bolt from the 85 blazer that I used on my 69 truck had 3.73. I believe its the same axle for pickups of that era. You may or may not have to move the perches though. Look for the two flat ears sticking out from the lower part of the diff, while looking at the cover, it's a good indicator of the 8.5 ring gear. Then check for the tag, if its not there, look for 41 11 stamped on the ring gear.

Shooters_7 · 11-05-2011, 06:58 PM

Keep the 12 bolt and rebuild with 3.73s

**Captainfab** · 11-06-2011, 12:04 AM

A 10 or 12 bolt from '63-'87 from a K5 or K10 should bolt up. But from about '73 and up the shock brackets will be different than what you have now. Another 12 bolt would ensure that your current U-joint will bolt up.

DBear · 11-06-2011, 08:37 AM

That is great info fellas.....there was a pop back by the rear end and now it will not go in reverse bit will go forward. Any ideas what that could be? I think rebuilding the rear end that is in it would be idea....not sure what that kinda repair could cost though!
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11-05-2011, 05:57 PM	#1
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Which Rear Differential?? Anyone know what years and what models have a 3.73 rear diff, that would swap into my '64 Chevy 4x4 Burb? I would like to find something that bolts up with no problems?

11-05-2011, 06:19 PM	#2
Dunenutt Newbee Join Date: Jan 2010 Location: Phoenix, Arizona Posts: 1,406	Re: Which Rear Differential?? The 10 bolt from the 85 blazer that I used on my 69 truck had 3.73. I believe its the same axle for pickups of that era. You may or may not have to move the perches though. Look for the two flat ears sticking out from the lower part of the diff, while looking at the cover, it's a good indicator of the 8.5 ring gear. Then check for the tag, if its not there, look for 41 11 stamped on the ring gear. __________________ My Build, http://67-72chevytrucks.com/vboard/s...58#post4464158

11-05-2011, 06:58 PM	#3
Shooters_7 Registered User Join Date: Apr 2011 Location: Great State of Texas Posts: 410	Re: Which Rear Differential?? Keep the 12 bolt and rebuild with 3.73s

11-06-2011, 12:04 AM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: Which Rear Differential?? A 10 or 12 bolt from '63-'87 from a K5 or K10 should bolt up. But from about '73 and up the shock brackets will be different than what you have now. Another 12 bolt would ensure that your current U-joint will bolt up. __________________ 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

11-06-2011, 08:37 AM	#5
DBear Registered User Join Date: Nov 2008 Location: Rowlett, TX Posts: 867	Re: Which Rear Differential?? That is great info fellas.....there was a pop back by the rear end and now it will not go in reverse bit will go forward. Any ideas what that could be? I think rebuilding the rear end that is in it would be idea....not sure what that kinda repair could cost though! Posted via Mobile Device

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