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Old 11-19-2005, 06:44 PM   #1
screamin_c102
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Locking Diff?

Today, I was under the hood of the '73 big block truck I recently bought "winterizing" and noticed the options sticker shows a "G86 Locking Differential" . Does anybody have any info on what type of locking Diff. they put in these 2wd 3/4 tons. I assume it is more of a limited slip style than a true locker but I have not taken the cover off to check. The rear end was redone a couple years back according to the receipts in the glovebox and doesn't leak a drop, so I dont want to rip it apart just to check. Anybody have any info on these diffs.

Thanks again.....Bill

Last edited by screamin_c102; 11-19-2005 at 06:56 PM.
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Old 11-19-2005, 07:43 PM   #2
JIMs70GMC
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Re: Locking Diff?

14bff, could be a detroit locker or a gov-loc(limited slip).
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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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Old 11-19-2005, 08:59 PM   #3
screamin_c102
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Re: Locking Diff?

The RPO decoders say it is a limiited slip, however it is the same code used on the late model camaros, caprices, impalas, trucks, etc. so it isn't too specific on what type of locking rear. Does anybody else have a 14 bolt with this code, and if so have any of you opened it up to see what type it is?

Jims70gmc, is the gov-loc any good?
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Old 11-19-2005, 10:37 PM   #4
JIMs70GMC
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Re: Locking Diff?

in a 14bff it's not bad. The 10 bolt 1/2ton model was week and got the name "gov-bomb".
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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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Old 11-19-2005, 11:37 PM   #5
screamin_c102
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Re: Locking Diff?

LOL. I could imagine. I had an 460 powered F250 with A Dana 44 front go boom took out the cover both spiders and a good portion of the case. We called it a three way open diff LOL.

Thanks for the info.
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