Here's the deal.
'01 Sonoma. Ext cab. 4.3 auto. 3.42 w/locking rear end. ZQ8, if that matters.
Truck has less than 6000 miles on it.
Changed the engine oil at 5400. Manual says to change rear end lube when engine oil is changed. Haven't done it *yet*, but plan to this week.
Did a 250 mile road trip yesterday. As I was nearing the end, I noticed that when I turned left from a dead stop, I'd feel a rumble or shudder until I got up to 5-10 mph or so. Doesn't do it on right turns. Also didn't do it this morning, when the truck was cold.
Is my POSI rearend shot? Will changing the gear oil fix the rumble? Do they come with special "break in" lube, that has different characteristics than the 80W90, or what?
Also, I was surprised that my shop manual specified the same gear lube (80W90) for the posi as for the "open" rear end.
'01 Sonoma. Ext cab. 4.3 auto. 3.42 w/locking rear end. ZQ8, if that matters.
Truck has less than 6000 miles on it.
Changed the engine oil at 5400. Manual says to change rear end lube when engine oil is changed. Haven't done it *yet*, but plan to this week.
Did a 250 mile road trip yesterday. As I was nearing the end, I noticed that when I turned left from a dead stop, I'd feel a rumble or shudder until I got up to 5-10 mph or so. Doesn't do it on right turns. Also didn't do it this morning, when the truck was cold.
Is my POSI rearend shot? Will changing the gear oil fix the rumble? Do they come with special "break in" lube, that has different characteristics than the 80W90, or what?
Also, I was surprised that my shop manual specified the same gear lube (80W90) for the posi as for the "open" rear end.