How many quarts? (fluid questions)

AK49BWL said:

I guess my Blazer has a problem then, because its 20k mile engine doesn't blacken within 3000 miles.... Wish I could say the same for my Sierra's 217k mile engine lol.

Click to expand...

Show me a quart of you oil new uncirculated and a quart of you oil after 3000 miles and I guarantee that the 3000 mile oil is blacker than the new.

AK49BWL said:

I guess my Blazer has a problem then, because its 20k mile engine doesn't blacken within 3000 miles.... Wish I could say the same for my Sierra's 217k mile engine lol.

Click to expand...

Blowby FTW!

Try changing the oil on a newer EGR/DPF/DOC equipped diesel engine. The new oil is black as soon as the engine is run the first time. Black oil means the additive package is capturing and suspending the soot/dirt particles and carrying them away as opposed to non-detergent oils that allow it all to settle to the bottom of the crankcase. One of many reasons that filterless small engines and the majority of small recip compressors don't want a detergent package in the oil, as the suspended particles become an abrasive slurry if not removed by a filtration system.

This concludes this edition of Nearly Useless Tidbits, brought to you by SAATR and the number 4.

evilunclegrimace said:

Show me a quart of you oil new uncirculated and a quart of you oil after 3000 miles and I guarantee that the 3000 mile oil is blacker than the new.

Click to expand...

I guess I should clarify that it doesn't turn completely black in that time, however it does darken over time of course. My Sierra's engine will change the oil completely black in the first 1500 lol.

LOL this is why these threads go haywire...

Yes Uncle is right, there are clutches in the G80, just not the same setup as a positraction rear. And speaking of RPO code G80, that is a code that has been recycled - when it's in certain models of CARS, it is in fact a positraction differential. In a GMT400 truck it is in fact the Eaton Gov-Loc.

GMT400 trucks only came with 2 setups from the factory. Open rear end, or the Gov-Loc. There is no posi. There is no posi. Repeat it with me.. there is no posi.

Richard

someotherguy said:

LOL this is why these threads go haywire...

Yes Uncle is right, there are clutches in the G80, just not the same setup as a positraction rear. And speaking of RPO code G80, that is a code that has been recycled - when it's in certain models of CARS, it is in fact a positraction differential. In a GMT400 truck it is in fact the Eaton Gov-Loc.

Click to expand...

Amen.
Because of the interchangeable G80 designation by GM, took me forever to understand the difference.

someotherguy said:

GMT400 trucks only came with 2 setups from the factory. Open rear end, or the Gov-Loc. There is no posi. There is no posi. Repeat it with me.. there is no posi.

Richard

Click to expand...

Amen........

someotherguy said:

LOL this is why these threads go haywire...

Yes Uncle is right, there are clutches in the G80, just not the same setup as a positraction rear. And speaking of RPO code G80, that is a code that has been recycled - when it's in certain models of CARS, it is in fact a positraction differential. In a GMT400 truck it is in fact the Eaton Gov-Loc.

GMT400 trucks only came with 2 setups from the factory. Open rear end, or the Gov-Loc. There is no posi. There is no posi. Repeat it with me.. there is no posi.

Richard

Click to expand...

There is no posi. There is no posi. There is no posi!

The posted videos (thanks to those who posted them) show how it works pretty well.

Next question then - given I have one it would be good to know - what's the weak point in them that earns them the Gov Bomb name?
So far, as much as I've picked up is they are fine unless you start doing burnouts and donuts and generally abusing them. Is that a reasonable summary? If I drive my truck like I don't want to break it (and I don't!) - nothing for me to worry about?

From what I've read it's the 10-bolt unit is what gives the G80/Eaton-Locker such a bad reputation, and that the parts for the larger differentials aren't that bad. However, I have never owned one..... my truck has an open differential.

Pinger said:

There is no posi. There is no posi. There is no posi!

The posted videos (thanks to those who posted them) show how it works pretty well.

Next question then - given I have one it would be good to know - what's the weak point in them that earns them the Gov Bomb name?
So far, as much as I've picked up is they are fine unless you start doing burnouts and donuts and generally abusing them. Is that a reasonable summary? If I drive my truck like I don't want to break it (and I don't!) - nothing for me to worry about?

Click to expand...

The LD's are not a race part, it is intended for off-road traction and slick conditions. They break when guys drop the clutch, power stands, blow the tires off, doughnuts in the WalMart parking lot, etc.

I've had LD diffs in three 10 bolt GM trucks, and in a 14 bolt, for a sum total of 200K-250K miles, including towing, they never missed a beat...........

I had an open 10 bolt that wasted the spider gears and cross pin. Then again, when I changed its gear oil, barely anything came out. Still though, bigger diff more better.