Well...as far as factory lockers go...Look in the glove box. There
should be a sticker in there with the factory options for the truck
listed. Look for a code that says "G80". The G80 is the Eaton locker
offered as a factory installed option in Chevys. I don't know if Chevy
offered a factory locking diff for the front axle, but it's possible.
I *had* one... It failed and took out my rear axle--requiring a
rebuild. Not to say that it's total crap, but I've never heard a
single good comment on the G80. It's an automatic locking
differential, meaning that when it senses wheel slip exceeding a
certain RPM relative to the other wheel, it'll lock. The problem, as
it was described to me, was the quick and violent nature by which it
locks, which can lead to failure. I can't say with 100% certainty that
this is true, but I do know that the diff seemed OK up through the
winter of 2004-2005, and then the unit failed not long after. By
coincidence (or not) we hard a pretty good freeze here in Atlanta and I
was out driving in it. During that driving, the back wheels were
slipping quite a bit, and the diff was locking and unlocking during all
that. BTW, the fact that I had no control over the locking and
unlocking made driving...er...interesting. There was no predicting how
it would react.
When I had the axle rebuilt, I specified an open (non-locking)
differential to be installed. To me, the ultimate solution is a
selectable locker, where you can either run open or fully locked.
Just my $.02...
Well there never was a factory "locker" offered in that vehicle ever.
There was a limited slip offered under a G80 as mentioned above (also
called the gov loc) but it was not a locker despite its name which is
very misleading. It uses a govenor controlled clutch pack thats
"locking" abilites are limited by clutch capacity and function. It
also is disabled at road speeds above about 20MPH. It is know for
cluncky/jerky operation at times and the one used in 10 bolt axles are
the least sturdy of them all because the smaller ring gear size limits
their size. GM has be offering a G81 last few years in HD which uses a
better Eaton LSD that is more predictable and durable.
True...the G80 uses clutches, which would technically put it closer to
a LSD in operation.
I know mine was fine until it got worked hard that one winter. When I
replace the axle (again) I will be going with something a bit more
substantial back there. More than likely a 14-bolt, but possibly
I would suggest a 14 bolt 9.5 semi floater. It is often overlooked and
it is a very stout axle. It usually has 6 lug hubs though it can have
either. Even the gov loc in it is a lot sturdier and the housing and
the axles are a lot stronger than a 10 bolt (it can safely carry about
3 tons vs maybe 2 tons on 10 bolt) yet it weighs about 75 pound less
than a 14 bolt full floater and has better ground clearance too. It is
about the equal of a D60. The 10.5 FF is rated at about 4 tons
What numbers in the glove box do you use to figure out what rear is in our
3500 dually 6.5TD I know it is a 14 bolt. When I had it jacked up I turned
the wheels and they rotated in opposite directions, but a few days ago we
parked on a hill and the right side was in mud. When I pulled out it
started to spin for just a second and then it locked in and pulled out with
the side that was on the road. I think it must be a locker because I never
had a limited slip that could move a 10,000 lb. (truck loaded at the time)
and with 12,000lb on a trailer... truck had with one wheel in mud and one on
It will say G80. GM never put a true locker in those trucks EVER.
(around 2005 there was a G81 too with was a different kind of Eaton
LSD (not a GovLoc like G80 is) When you get to the bigger axles like
the 14 bolt FF, it has a pretty good posi action to it because there
is room for a bigger diameter carrier and clutch pack to limit
Well first Dodge does not make one, it is from a aftermarket supplier
and GM does use one like it in some specailized models but not in 2500
ot 3500 P/U's at this time. AAM has been making axles for GM for a
long time and most notabley the 10.5 inch 14 bolt full floater well
known for its sturdy qualities. Now all their axles are AAM and most
of Dodges are now too (all 2500 and 3500 truck use them front and rear
and 1500 P/U's use then in front and some LD SUV's use them front and
rear and the front axle in HD P/U's is based on the same ring and
pinion that GM uses in its IFS in HD trucks, the 9.25 and gears for it
will fit in Dodge front axle) Funny thing is that ALL Dodges with 4x4
use no front axle disconnect be it IFS or solid (saves Dodge a few
bucks) which means EVERY 4x4 they make will use more fuel than it
should (about 1 MPG on HD models and 2 or 3 MPG less on LD models)
because it will always be spinning the front ring/ pinion and drive
shaft too even in 2wd. Dodge does not tell you that though. Better yet
when Dodge went to a IFS front axle rather than using the proven 7.5
and 8.25 front axle with a disconnect, Dodge used a AAM 8.0 that was
designed for a rear IFS with no disconnect in it for a front drive
axle (and people wonder why I am hard on Dodge 4x4's sometimes) Dodge
uses the same 11.5 AAM rear axle now behind CTD that GM does behind
8.1 and Dmax. In their HD P/U's with a hemi they use a 10.5 AAM but it
is not the same axle as GM as it costs less to make and none of the
parts interchange with GM 10.5. (GM iuses a straddle mounted 3 bearing
pinion design on their 10.5 axle while Dodge uses a 2 bearing pinion
Your Z28 might but it is not likely that the CTD does. If it does, it
is the first I have heard of it. a 2004 should have a 11.5 AAM and
there was not (to my knowledge) a gear type LSD availible for it when
truck was built. The Camaro seires axle would of had a aftermarket
source for detriot to use though because the axle design used has been
around for a long time while the AAM first saw the light of day in
2001 GM trucks.
I was under the impression that it was established a long time ago that you
knew absolutly nothing about dodge truck's and even less about Cummins
diesel's. Now here you are disputing what a man say's is in the car and
truck that he owns.
If BS was music you'd be a friggin' symphony. Give it a rest will ya
Not true. All 2002 Z28's have the Torsen unit. I believe the 01's do too.
A new limited slip differential is available on Ram Heavy Duty. The helical
gear design provides torque biasing and eliminates the "chatter" found in
friction plate designs. The system requires no lubricating additives.
Nothing worse then then Non-GM numbers and data. It can be misleading.
While the 99 ups may have came with a Torsen standard. The 1994 to 98's
it was a option.
The problem here is getting my greedy little paws on a good 4th gen
rear end with a LSD unit. Everyone wants a arm and a leg for one. Same
problem with the seats if there decent & the right color. Heck even for
Steel 16 inch wheels off them (close enough offset to a S-10 4x4) people
want almost as much as after market steels go for new!
I own way to many vehicles to post a sig list.
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