Destructive forces inside the rear differential
I was running a torsen in a 4.10 geared 7.5 10bolt. Carrier, ring gear, pinion all survived hard launches. My problem was a torsional overload of the axle, initiating at the spline.
Originally Posted by thunderdan74
How do you check for carrier perload?
If your pinion drag was 15 and your total was 28 and since the gear ratio makes the carrier drag seem much smaller when measure at the pinion, this equates to ~ (28-15 lb.in) * gear ratio (let's use 4:1) = 52 lb.in at the carrier. This is very rough since it assumes the teeth have no drag on each other.
Originally Posted by BJM
Preload checking for the carrier is the same as for the pinion. You first measure pinion drag at the pinion nut. After inserting the carrier you now have more drag on the pinion nut since you are turning the carrier via the pinion gear. Measure the new total drag. The service manual shows 10-15 lb.in for the pinion alone and 15-28 lb.in (from memory) for the total for used bearings.
If your pinion drag was 15 and your total was 28 and since the gear ratio makes the carrier drag seem much smaller when measure at the pinion, this equates to ~ (28-15 lb.in) * gear ratio (let's use 4:1) = 52 lb.in at the carrier. This is very rough since it assumes the teeth have no drag on each other.
If your pinion drag was 15 and your total was 28 and since the gear ratio makes the carrier drag seem much smaller when measure at the pinion, this equates to ~ (28-15 lb.in) * gear ratio (let's use 4:1) = 52 lb.in at the carrier. This is very rough since it assumes the teeth have no drag on each other.
I would think it would be a good idea to make note of the initial preload values, go launch it after break-in and re-shim it to get the initial values back. That's assuming it's niose free after it's initial setup, pre launch.
I know it's off topic, referring to my 12 bolt but, What do you guys think?
