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New Warn Manuals - only one wheel spinning?


bigredscowboy

Well-Known Member
Joined
Nov 16, 2008
Messages
168
City
Western NC
Vehicle Year
2003
Transmission
Manual
I finally did it: I spent a lot of money to buy the Warn 37780 manual locker set (Jeep version $170 Amazon) and was so excited I skipped breakfast to put them in. Bought the conversion kit from TRS for $28 shipped (28068x). Even went to Advanced and got a "loaner" torque wrench and socket set. You pay for it and then return for a full refund=FREE. Installed driver side first and threw it in 4x4. Not one damn thing happened. The haft shaft from the diff wasn't spinning on the driver side. So I put on the passenger and it is working. I understand this is an open diff but shouldn't both be spinning when there is no weight on the axle?

The driver spindle turned just fine before putting the new hubs on but I already feared this was a problem even when the auto were on, sometimes the driver half-shaft wouldn't spin with the tire on. After I took the driver tire off I could get the spindle moving very slowly. WTF
 
Last edited:
Perfectly 100% normal. BOTH sides MUST be locked before ANY power will be properly transferred through an open diff.
 
it takes hardly any force to stop a wheel with an open diff. you could have a stiff u-join, dragging brake caliper, what-have-you.

use your foot to stop the passanger tire, the drivers side should start turning.
 
Wicked_Sludge said:
it takes hardly any force to stop a wheel with an open diff. you could have a stiff u-join, dragging brake caliper, what-have-you.

use your foot to stop the passanger tire, the drivers side should start turning.
Click to expand...

Yep. Sux, but a differential is a brilliant but archaic device. It takes so little traction on one side to stop that wheel that with 2 open differentials you can't go anywhere. Just locking the rear up makes the front work a lot better because then the front 'free' tire doesn't have as much clout without a rear 'free' tire to team up with it. The front 'free' turns the same speed as the rear pair and the front differential isn't allowed to blow off all the power on the lightly loaded tire. A front locker adds maybe 15% capability if you already have a rear locker. If you have floppy suspension it adds maybe 5%-and those are all trails where you can actually pick up a front tire.
 
yes. an open differential applies equal amounts of torque to both wheels at all times. if one wheel is on a slippery surface (or in the air), the wheel that has traction wont recieve any power (any number times zero is zero).
 
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