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I have a new just purchased 2007 GMC Topkick, the factory build sheet shows a $375.00 option Rear Axle Differential Lock.
The book show a switch on the dash but I do not have a switch on the dash, does this mean I really do not have the Rear Axle Differential Lock.
Or does it stay in the lock mode all the time.
the C4500 and C5500 share dash boards with its larger C6500-C8500 brothers. The RPO G80 locking rear is of the Eaton type, which is self locking. the dash board switch is mostly to lock or unlock the rear axle of a tandem axle C8500. I don't know of an airlocker for the Dana S150 like in the HD C4500 and C5500, but it would be nice.
1995 C3500HD 6.5
1995 C7500 Caterpillar
1996 C3500HD 6.5