Posted by Mike on November 09, 19100 at 05:43:46:
In Reply to: Blown Differential - Multiple times posted by Traveler on November 08, 19100 at 18:29:53:
: We've seen several posters who have had differential failures fixed, only to have the same problem soon after. I always tend to blame the mechanic because I've done diff setups and I know how exacting it is.
: Recently reading some other web sites, I'm becoming more convinced the hypoid gear break-in period is critical. It takes 500 miles of egg-under-pedal driving to break in the geras. Then a gear oil change somewhere before 3000 miles on the new gears.
: If you are out on a trip towing a trailer and the diff blows, the trailer can't be reconnected until after 500 miles of break-in. Can you think of anyone who might be tempted to cut a corner here?
I understand and agree with your point but it might be helpful to clear up one item. Replacing the differential itself requires no break in period. Replacing the ring & pinion requires exactly the break-in that you stated. It is also helpful to use conventional dino juice for the 500 miles break-in, then flush and refill with Mobil 1 gear lube.
And for those who are taking delivery of a new Suburban, follow Travler's suggestions or you'll soon be posting your problems here!