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Tom Woodman
Guest
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 Posted:
Sat Dec 10, 2005 10:59 pm Post subject:
How can I tell if a 4x4 has a locking rear differential? |
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sdlomi2
Guest
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| Posted:
Sun Dec 11, 2005 4:32 am Post subject:
Re: How can I tell if a 4x4 has a locking rear differential? |
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"Tom Woodman" <tomwoodman42@hotmail.com> wrote in message
news:11pm2cofv1bvq55@corp.supernews.com...
| Quote: |
Jack up rear wheelS(both). Put in neutral w/emer. brake off. Have |
someone hold one rear wheel still while you try to spin the opposite one.
If it spins ok, it's unlocked; if it is extremely difficult to turn, or will
not turn, it is locked.
Had an acquaintance lose his responsibility for ordering new cars when
he ordered all GMC 4X4's w/o specifying locked differentials. Perhaps even
a 2X w/posi-trac'n. differential will pull better than a 4X w/unlocked
differentials?! s |
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C. E. White
Guest
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| Posted:
Sun Dec 11, 2005 4:44 am Post subject:
Re: How can I tell if a 4x4 has a locking rear differential? |
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Make/Model/Year information might get you a better answer. Axle codes from
the vehicle's identification plates would help even more. Depebding on the
vehicle/axle type, you might be able to jack the vehicle up and try turning
one wheel while someone else holds the other. Or just floor it on muddy
ground. If you sling mud from both rear wheels, you probably have a limited
slip.
Ed
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Steve Mackie
Guest
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| Posted:
Sun Dec 11, 2005 5:50 am Post subject:
Re: How can I tell if a 4x4 has a locking rear differential? |
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| Quote: | Make/Model/Year information might get you a better answer. Axle codes from
the vehicle's identification plates would help even more. Depebding on the
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That's his best bet, posting the year/make/model and all the RPO codes.
Steve |
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Shep
Guest
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| Posted:
Sun Dec 11, 2005 6:35 am Post subject:
Re: How can I tell if a 4x4 has a locking rear differential? |
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G80 on the rpo tag is an Eaton locking diff.
"Tom Woodman" <tomwoodman42@hotmail.com> wrote in message
news:11pm2cofv1bvq55@corp.supernews.com...
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The Adams Family
Guest
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| Posted:
Sun Dec 11, 2005 10:30 pm Post subject:
Re: How can I tell if a 4x4 has a locking rear differential? |
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Flooring it on a muddy road does not always tell you either. I have a blazer
that I bought new with locking differential and it no longer locks up. The
dealer told me you have to change the differential fluid every 20000 miles
for it to work properly, what crock of bull! You never used to have to do
that years ago, I guess this is another GM engineering marvel.
"C. E. White" <cewhite@mindspring.com> wrote in message
news:CTImf.2112$3Z.468@newsread1.news.atl.earthlink.net...
| Quote: | Make/Model/Year information might get you a better answer. Axle codes from
the vehicle's identification plates would help even more. Depebding on the
vehicle/axle type, you might be able to jack the vehicle up and try
turning one wheel while someone else holds the other. Or just floor it on
muddy ground. If you sling mud from both rear wheels, you probably have a
limited slip.
Ed
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C. E. White
Guest
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| Posted:
Mon Dec 12, 2005 4:42 am Post subject:
Re: How can I tell if a 4x4 has a locking rear differential? |
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"sdlomi2" <sdlomi2@spam.yahoo.com> wrote in message
news:8WJmf.12674$tQ7.6747@fe04.lga...
| Quote: | Had an acquaintance lose his responsibility for ordering new cars when
he ordered all GMC 4X4's w/o specifying locked differentials. Perhaps
even
a 2X w/posi-trac'n. differential will pull better than a 4X w/unlocked
differentials?! s
|
It really depends on what you are doing. Limited slips don't create
traction. If both rear wheels are loaded the same and are on surfaces with
similar frictional characteristics, the limited slip isn't going to help
much. Now if one rear wheel is unloaded or in a mud hole and the other is on
firm ground, then a limited slip can save your ass. However, a limited slip
can make it easy to loose the rear end on low friction surfaces and spin out
the vehicle. Personally I'd never order a 4x4 without a limited slip rear
axle. On the other hand, in 40 years of driving farm tractors with locking
rear axles, I've never once had locking the rear axle get me out of a jam.
The usual result of locking the rear axle is burying the tractor to the axle
housing. But this is a situation where both wheel usually have the same
traction available.
Ed |
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