So I have what was sold to me as a
1971 Chevrolet K20
3/4 ton pickup
Fleetside long bed
I had one hell of a time finding a locker for the rear diff. No
one could even figure out what the rear end was. Finally found
an old guy who had an old Detroit Locker he put in. I guess
there are not many options for the old rear ends. Especially
when it is not the right rear end. Apparently an Eaton H052
would be correct for the year or even a H072 if it was a 1-ton,
unless it had a Dana. What it had/has is an Eaton H070 for a
Would a 1-ton rear end fit a 3/4-ton frame?
How can I tell if it is a 1-ton or 3/4-ton frame?
On some 1 ton frames, the top and bottom of frame rails are about 1/4
inch wider. (I have seen this on 73 to 87 model but not sure if it was
different on 67 to 72) On the rear axles, GM used the HO52/72 up
through 72 in some models with 4x4 Some (mostly GMC) used 12 bolts if
they were 1/2 t, D60's if they were 3/4 t and D70's if one T. The
Eaton rear axle is easy to ID because it has a removable carrier pig
and no removable cover plate. If it has a ring gear thrust pad
adjuster on the side of carrier housing, it is a HO72 series axle. At
detriot locker is the old option for that tuff old axle (it is well
above a D60 in strength) The HO52/72 have the same interals gear and
locker wise and I have never been able to see much differencce in them
otherwise other than the thrust adjuster mentioned above
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