DO NOT add any additives to the locking differential. Those are designed for Limited Slip Differentials which are normally installed in cars and AWD vehicles. Trucks with G80 use a locking rear differential and the use of any additive can delay the locking and cause damage to the differential...
I'm the proud owner of a 2000 Chevy Silverado ext. cab 4X4 Z71 with a push button controled transfer case. A few weeks ago I broke 50,000 miles on the odometer and I need to change the transfer case fluid and differential fluid and change the transmission fluid and filter as well. Ive done a...