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Old 11-18-2008, 10:35 PM
Olbird Olbird is offline
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Join Date: Oct 2008
Location: Washington
Posts: 5
Default Rear Axle Differential Lock Control

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.
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Old 12-27-2008, 09:34 PM
mkhagemann mkhagemann is offline
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Join Date: Sep 2000
Location: Tyrone,Georgia - USA
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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
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