Can someone identify these Diffs? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

al's71gmc · 08-27-2005, 06:51 AM

Iv'e looked at several threads on front and rear ends, but I'm still not sure. I think the rear end is a dana 60? it's a full floater in a 71 3/4 gmc. I looked for id in the webbing and all I can find is the # 60 on the rear and nothing on the front diff. TIA, Al

**JIMs70GMC** · 08-27-2005, 08:03 AM

Dana 60 rear and dana44 front just like in my 70 GMC except if this is your 71, I have front drums.

al's71gmc · 08-27-2005, 08:08 AM

Thanks Jim. What kind of lockers or limited slips can I put in there?
Al

**JIMs70GMC** · 08-27-2005, 08:21 AM

A powr-loc was an option in the rear and a trac-loc was available for the front(both clutch type). There are drop in type lockers available for both as well as limited slips and full lockers(aka- detroit locker) available. The drop in lockers are the cheapest/easiest to install, with the others requiring the gears to be re-established since the carrier has to be replaced. I have a no-spin(detroit-locker) in my eaton rear of my chevy and have a eaton rear to replace the dana60 in my GMC one day that will also have a detroit locker. Open fronts in both for now, but am leaning towards a drop-in locker for those. Since the drop in locker uses the original open case it is considered not as stout, but if you keep the tire size down around 33" it should be no problem. I have a powr-loc(factory) in my GMC now, it holds fairly good and I tested per the 1970 Chassis manual and it's still in spec after 35 years, but it is no locker.

al's71gmc · 08-27-2005, 08:33 AM

by "drop ins" do you mean something like a lock right or aussie lock ? Money is an issue, as always.
Al

**JIMs70GMC** · 08-27-2005, 09:49 AM

yep, lunch box lockers, take out the spider gears and reuse the cross shaft.

*1FaastC10* · 08-27-2005, 10:41 AM

Quote:

Originally Posted by al's71gmc

by "drop ins" do you mean something like a lock right or aussie lock ? Money is an issue, as always.
Al

if its worth doing, its worth doing right the first time.

08-27-2005, 06:51 AM	#1
al's71gmc 4 eyed fever Join Date: Jul 2005 Location: Eureka, Nevada Posts: 500	Can someone identify these Diffs? Iv'e looked at several threads on front and rear ends, but I'm still not sure. I think the rear end is a dana 60? it's a full floater in a 71 3/4 gmc. I looked for id in the webbing and all I can find is the # 60 on the rear and nothing on the front diff. TIA, Al Attached Images __________________ 1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!!

08-27-2005, 08:03 AM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Dana 60 rear and dana44 front just like in my 70 GMC except if this is your 71, I have front drums. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

08-27-2005, 08:08 AM	#3
al's71gmc 4 eyed fever Join Date: Jul 2005 Location: Eureka, Nevada Posts: 500	Thanks Jim. What kind of lockers or limited slips can I put in there? Al __________________ 1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!!

08-27-2005, 08:21 AM	#4
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	A powr-loc was an option in the rear and a trac-loc was available for the front(both clutch type). There are drop in type lockers available for both as well as limited slips and full lockers(aka- detroit locker) available. The drop in lockers are the cheapest/easiest to install, with the others requiring the gears to be re-established since the carrier has to be replaced. I have a no-spin(detroit-locker) in my eaton rear of my chevy and have a eaton rear to replace the dana60 in my GMC one day that will also have a detroit locker. Open fronts in both for now, but am leaning towards a drop-in locker for those. Since the drop in locker uses the original open case it is considered not as stout, but if you keep the tire size down around 33" it should be no problem. I have a powr-loc(factory) in my GMC now, it holds fairly good and I tested per the 1970 Chassis manual and it's still in spec after 35 years, but it is no locker. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm Last edited by JIMs70GMC; 08-27-2005 at 08:24 AM.

08-27-2005, 08:33 AM	#5
al's71gmc 4 eyed fever Join Date: Jul 2005 Location: Eureka, Nevada Posts: 500	by "drop ins" do you mean something like a lock right or aussie lock ? Money is an issue, as always. Al __________________ 1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!!

08-27-2005, 09:49 AM	#6
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	yep, lunch box lockers, take out the spider gears and reuse the cross shaft. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm



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