| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It doesn't cost anything to jack up the rear end and count driveshaft and wheel turns, then you will know for sure. If you have to jack up both rear wheels to get one to turn, you have some sort of locking diff.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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