Differentials?
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Junior User
Joined: Sep 2002
Posts: 53
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Differentials?
I was reading Pertersons 4x4 and they said open only turns on tire all the timeIE rear right.LS is one to tansfer the power the the tire with greatest grip. and Posi is both tires turn at same speed when cornering.In extreme cases can break loose.One wheel on the ground one in the air its loose.
My question is my axle Dana 60 in a 78 300 RC LB 2wd F150-well sorta.On the tag it says 3L73 that is 3.73 gears Limited slip.I brought my right rear tire off the ground and Backed up through a dry creek bed about a 30* slope-they both spun-do I have a locker?
Thanks,
Dusty
My question is my axle Dana 60 in a 78 300 RC LB 2wd F150-well sorta.On the tag it says 3L73 that is 3.73 gears Limited slip.I brought my right rear tire off the ground and Backed up through a dry creek bed about a 30* slope-they both spun-do I have a locker?
Thanks,
Dusty
Elder User
Joined: Dec 2002
Posts: 738
Likes: 2
From: McChord AFB
Differentials?
No thats what possi does. A standard open diff will transfer power to the wheel that isnt slipping and a possi set up will lock the diff when the wheels start spinning instead of transfering power all to the other. The possi track rears are simply clutch packs in the diff so when that they are allowed to slip (ie cornering) but when you but the power down then the axle lockst up. A locker would be manually operated (ie electric or air activated solonoid). Hope this helps!
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
Differentials?
An open diff sends power to the wheel with the least traction, i.e., the spinning one. That's why a truck with open diffs & one wheel on each axle spinning can't move - none of the engine's power is going to the tires that are on solid ground.
A limited slip (called "positraction" by GM) has clutch packs that try to keep the wheels turning the same, but still slip when there's a big difference in traction and you hit the gas. They NEVER "lock up".
Read the "Diffinitions" post in this thread:
http://tellico.off-road.com/ubbthreads/showflat.php?Cat=&Board=offroadfordbroncolate&Numb er=673392&page=9&view=expanded&sb=5&o=0#Post673392
A limited slip (called "positraction" by GM) has clutch packs that try to keep the wheels turning the same, but still slip when there's a big difference in traction and you hit the gas. They NEVER "lock up".
Read the "Diffinitions" post in this thread:
http://tellico.off-road.com/ubbthreads/showflat.php?Cat=&Board=offroadfordbroncolate&Numb er=673392&page=9&view=expanded&sb=5&o=0#Post673392
Senior User
Joined: Aug 2002
Posts: 106
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From: Blountsville USA
Differentials?
I have a 1975 F-100 4x4 with a Dana 60 rear with the powerloc unit and a front Dana 44 with an Auburn pro-series, both brand new. The rear axle will not pull if one wheel is off the ground. It needs some pressure to load the clutch packs to make them both pull. I can usually apply the brakes to make them both pull, but in 2wd the front brakes will keep the truck from moving. In 4wd, the process works much better. The Auburn unit is better at pulling both wheels when one is in the air. I guess it has more preload. The only time I have had to use the brakes in 4wd was when I drove the right front tire into a creek bank 3' tall. It was just too much load on that one tire. The left front and both rears started spinning. I gradually eased down on the brake and the gas and it finally started pulling and drove up the bank and over. The Dodge behind me had to winch up the bank!
