In my option code list for the 3500 srw D/A i have on order,The option code for the "Locking rear differential" is GT4. I thought the code was G80 ? Any opinions ?

Here are the codes identified from my vehicle build sheet.


Code: G80 Differential, locking, heavy-duty, rear.


Code: GT4 Rear axle, 3.73 ratio, which is the only ratio available with the Dmax.


Fran

If you got the "Heavy Duty Power Package", you got the G80 Eaton Locker. It's included.

McRat


In Canada we don`t have a "Heavy Duty Power Package",sounds interesting though.What does this package contain ?


PS


Your truck looks great,I should of went for the blue !

The HDP Package is the Duramax, Allison, the G80, and I think there is some other item too.


If your order had the Duramax and Allison listed on the same line, and about $6500 US listed, that should be the Package.


If you are in doubt, you should check with your dealer post haste. The posi option is cheap if done at the factory but expensive if you have it done afterwards.

Hmmm... Here's a thought.


Can you even GET a 3500 without G80? It looks like it's standard equipment on the 1 ton.

The Duramax and Allison were listed as separate options,We can`t get them as a package deal.
I can`t find anything in my sales agreement or options that even mentions the G80.Maybe a call to the dealer is in order on monday.Thanks for your input Edited by: Bigf00t

Ok... I'm just dumb, but humor me here. Is this eaton like a detroit locker, or what? What causes the rear diff to lock up? Can I purposely tell it to lock the diff, and if so, how?

"Can I purposely tell it to lock the diff, and if so, how?"


Juice or Quad or TTS or Speedloader and stomp on the go pedal http://www.dieselplace.com/forum/smileys/Evil Smile.gif


It should lock right up http://www.dieselplace.com/forum/smileys/Big Smile.gif





Actually it is a plate type limited slip/locker, one wheels spins and it locks both wheels together.

It's a speed sensitive true "locker". It's very trick for a posi unit:


http://www.automotive.eaton.com/product/traction_stability/lockingdiff.html



<TABLE>
<T>
<TR>
<TD>Availability</TD></TR>
<TR>
<TD>
¨ Standard Equipment on Dual Wheel 3500 Series trucks.<?XML:NAMESPACE PREFIX = O /><O:P> </O:P>
¨ Optional Equipment (G80 Order Code) on all GM two-wheel and four-wheel drive light trucks and sport utilities.<O:P> </O:P></TD></TR>
<TR>
<TD>Benefits</TD></TR>
<TR>
<TD>
¨ Improved traction differentiates the vehicle relative to other rear wheel and four-wheel drive vehicles on the market.<O:P> </O:P>
¨ Functions as a limited slip differential during normal driving conditions; provides full axle lock when needed.<O:P> </O:P>
¨ Maintenance free; requires no lube additives.<O:P> </O:P>
¨ Enhanced towing and off-road performance.<O:P> </O:P>
¨ Patented carbon friction disc technology enhances performance and durability while reducing warranty claims.<O:P> </O:P></TD></TR>
<TR>
<TD>Principles of Operation</TD></TR>
<TR>
<TD>
¨ Wheel speed difference (left to right) in excess of 100 RPM will cause a flyweight mechanism to open and catch a latching bracket.<O:P> </O:P><

If you jack up the rear end and spin one tire the other one will spin if you have a locker. Sometime it will spin in the oppisite direction. If it doesn't spin you have an open differential

Nail the gas in your driveway. Count the stains.


Better yet, your neighbor's driveway with that dog that barks all night.

Or, you can simply look at the spid label on the glove box door and look for code G80.http://dieselplace.com/forum/smileys/Big%20Smile.gif


JP

Ok question number two... Why the heck don't they make it an option for both diffs, not just the rear? Or better yet, does eaton make a locker for the front period?

I've heard running a posi also on the front wrecks the streetability when in 4wd. I'm not totally convinced.


FWD performance cars often run LSD (Limited Slip Differentials). So it's not a fact that LSD on the front is a problem.


My guess, is that when cornering in 4WD, the fronts move a longer distance than the rears. This would cause "binding" and additional load on the transfer case.


It would actually make more sense running LSD on the front of a 4WD, and leave the rear open if you had to choose one. More of the weight is on the front, and it's the steering end. It should pull you out of a jamb better than rear-only LSD.

How does the mobile 1 syn.oil for rear diff compare in durability and specs to the oem oil the diff comes out of the factory with?Gm blessed


Tomslick24

[QUOTE From McRat]


I've heard running a posi also on the front wrecks the streetability when in 4wd. I'm not totally convinced.


FWD performance cars often run LSD (Limited Slip Differentials). So it's not a fact that LSD on the front is a problem.


My guess, is that when cornering in 4WD, the fronts move a longer distance than the rears. This would cause "binding" and additional load on the transfer case.


It would actually make more sense running LSD on the front of a 4WD, and leave the rear open if you had to choose one. More of the weight is on the front, and it's the steering end. It should pull you out of a jamb better than rear-only LSD.


Here is my .02 on what MCRAT has said, Yes many vehicles have some type of full time 4x4, but typically they are putting part of the power to the front and part of the power to the rear through some type of torque management system, IE a clutch type device capable of allowing power slip between the two powered driveshafts from the transmission to prevent driveline windup. Also our trucks are rear wheel powered to have the towing capacities along with the long life rear end. If the front differential were used all the time you would be replacing CV joints all the time.


Here again just my .02 Fran

You guys must have the autotrack or whatever it is. I like my pushbutton 4wd. I was wondering about the locker up front idea simply because I know from personal experience that full diff lock is a good thing... pulled my chevy out of a wheel deep mud pit with a tow strap and my work land rover 110 in diff lock low.


Anyone have a line on front diff locks compatible with our front differentials housing?


Edited to add: Looks like they make E-lockers, nothing like the G80 option for the front end though.Edited by: SpoolinTurbo

Your safest best would probably be a "lock on demand" front diff.


Check with a 4x4 shop, I forget the brand. You push a button, and VOILA instant front spool.


What I was saying, was that if you are stuck, and you can only have ONE posi (LSD) unit in a pickup, the front would be more likely to help than the rear.


As far as the "Autotrack?", I've been driving in desert sand for 25 years, and mostly with 2WD vehicles. I can count the times I've been stuck on my fingers. I've got friends who get stuck all the time in 4x4's. Driveline configuration is not as important making sure you don't have a loose nut behind wheel.


If I had to pick what to config a heavy pickup with to avoid getting struck:


Large low pressure tires. Deep cleats for mud, shallow for sand.


I'd rather have a 2wd with no posi and huge tires than a 4x4 with spools and normal street tires at 80psi. It's all about footprint.