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Differential question.

Jones

Well-known member
2,237
83
48
Location
Sacramento, California
Well, I may have just wasted a week-end.
The rear axle in the baby HEMTT has what I considered excessive play in the gear train. This was based on the fact that, with a driveshaft bolt hole a 12:00, I could rotate the input flange almost far enough for the next bolt hole to assume the 12:00 position.
Got another differential and this one was much tighter; could only rotate flange far enough to move a bolt hole 5/8" to 3/4" from it's starting point.
After a full day's work swapping out the differential, I'm standing there admiring my handiwork and studying the differential I just removed; clean, bright, I can still see the paint from checking the gear contact and I realize that by looking into the hole in the casting that encloses the spiders I can see a big spring staring back at me. I dive into my 24Ps for both M800 and M900 series 5 tons and neither one shows a spring in the exploded view.
With a sinking feeling I realize that Barstow Truck Parts having been my source for the axles is practically next door to Barstow Marine Corps Base and don't I remember a thread saying that some USMC trucks had locker differentials.

My questions:
Do locker differentials naturally have more play in them than standard non-lockers?
Do these aforementioned lockers work for traction control a la Sure-Grip, Posi-Traction, etc. or do they just "unlock" to make cornering easier on tandem rear axle assembly components?
And, Did I just spend a week-end replacing a perfectly good locker differential with a non-locker?
 

Elwenil

New member
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Location
Covington, VA
Yes, a locker will have more play that a standard diff. It sounds like you might have swapped out a good locked diff. I probabaly would have done the same without thinking about it though, lol.
 

Elwenil

New member
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Location
Covington, VA
If I understand it right, the lockers are either a Detroit Locker or similar design. They lock when torque is applied through the driveshaft and unlock when coasting.
 

ssgtwright-usmc

New member
530
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Location
Hawaii
I am sure someone is going to say (look it up, its been posted before)! Just kidding but thats the replies I have have been getting lately when I post something that I did not know was posted before.
Again everyone, I am joking here now!!!!
 

gringeltaube

Staff Member
Super Moderator
Moderator
Steel Soldiers Supporter
6,872
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113
Location
Montevideo/Uruguay
:) Yes ssgtwright-usmc, here it goes ....: Jones, see my post here: http://shortlinks.net/xbp805 regarding operation of a Detroit locker which I think is in your diff.
DLs do not unlock when coasting, so better don't accelerate or engine brake while cornering!

G.
 
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