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Old 12-19-2019, 01:00 PM   #1 (permalink)
Sparkplug Hunter
Join Date: Jul 2018
Location: Northern CA
Posts: 1

4WD drive train question

I'm the original owner of a 2007 2500HD Classic 4WD with 65K miles. All other maintenance has been kept up to date, but I haven't replaced the differential and transfer case oil. Should this be done soon? If so, should I use a synthetic for longevity?

2007 2500HD Classic 4WD LBZ 65K miles

Last edited by OkDually; 12-19-2019 at 01:16 PM. Reason: prefix adj/sig
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