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Stranger ranger

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Stranger ranger Enthusiast

Stranger ranger

Posted
Posted

Has anyones g80 locked itself in and failed to release acting like a full blown spool or detroit (chirrping tire around a corner) and then finally release upon backing up or stopping and pulling out again? Mine has done this twice and I really didnt think anything of it but i'm just curious.

 

I've also noticed that it doesnt lock in as good as it used to, if at all anymore. Being that its a 5-speed, I have a tendency to throw it side ways here and there and regardless of whether or not its good for it (we all know its bad). Well the last few times its spun only one tire and i'm trying to figure out if I blew it out or if its just worn or what. When I first got it, 4 out of 5 times it would kick in and you would have to hang on but now its not the case.

Daryl LBZ Senior Enthusiast

Daryl LBZ

Posted
Posted

Mine has done that a few times this past winter in the parking lot at work. I hit ice which caused it to spin and when I backed into my spot it wouldn't unlock. I pulled out went down the lot made a right turn and it made a loud bang and unlocked. It was cold out and the rear end fluid was cold so I just figured thats why it did it.

Z45 Senior Enthusiast

Z45

Posted
Posted

Change the gear lube..

rodram Enthusiast

rodram

Posted
Posted
Change the gear lube..

 

yes, changing gear lube may help ... the G80 is a mechanical locker and DOES NOT use any additive to the lube ... some people may try to tell you that you need a 'limited slip additive'... but the G80 is different, just use conventional 80W90 .. or some synthetic equivalent.

ColoradoSkiCountry Senior Enthusiast

ColoradoSkiCountry

Posted
Posted

baby the thing. Paying $1600 for a new one really sucks! Of course that was $1600 for a 1500 1999 Silverado too.. Never abused the thing either. Not sure how much more they would charge for a 2500/3500.

ColoradoSkiCountry Senior Enthusiast

ColoradoSkiCountry

Posted
Posted

If you want to pay the extra $$$ for a rebuild/replacement then by all means go for it. I can find better things to do with $1600 then spend it needlessly on a rebuild on the rear diff because I was abusing my truck.

 

why should i baby it? I'd rather it blow rather than messing with me.
wild willy Enthusiast

wild willy

Posted
Posted
yes, changing gear lube may help ... the G80 is a mechanical locker and DOES NOT use any additive to the lube ... some people may try to tell you that you need a 'limited slip additive'... but the G80 is different, just use conventional 80W90 .. or some synthetic equivalent.

 

Careful what you say about the G80- that may be true in the truck world, but GM calls all posi's G80- the Caprice G80 was made by Auburn, had cone clutches, and definitely needed the additive. The Camaro I own has a torsen unit for the posi, again called G80 by GM- debateable about whether you need the addictive, but it doesn't hurt- I have seen Eaton ones with clutches, too, and they needed the friction modifier- just trying to make sure that someone doesn't think that all GM G80's are the same-

Badass69 Senior Enthusiast

Badass69

Posted
Posted
yes, changing gear lube may help ... the G80 is a mechanical locker and DOES NOT use any additive to the lube ... some people may try to tell you that you need a 'limited slip additive'... but the G80 is different, just use conventional 80W90 .. or some synthetic equivalent.

 

Careful what you say about the G80- that may be true in the truck world, but GM calls all posi's G80- the Caprice G80 was made by Auburn, had cone clutches, and definitely needed the additive. The Camaro I own has a torsen unit for the posi, again called G80 by GM- debateable about whether you need the addictive, but it doesn't hurt- I have seen Eaton ones with clutches, too, and they needed the friction modifier- just trying to make sure that someone doesn't think that all GM G80's are the same-

 

 

 

RPO G80 in a pickup truck since 1973 has meant Gov Lock. That's 37 years covered so it's pretty safe info. Your Caprice Auburn would be the same one in my 1996 9C1 and they have no clutches either. It's spring loaded cone gears that eat into carrier over time. They work well, but when they wear out the entire carrier is junk.

 

Gov Locks actually have clutch plates in them as well. They are there to aid in softening the locking action of the diff. And it is correct that GM says to just use gear oil with no friction modifier. However even if the modifer is there it's not going to stop the unit from working or not. It's simply un-needed.

Z45 Senior Enthusiast

Z45

Posted
Posted
yes, changing gear lube may help ... the G80 is a mechanical locker and DOES NOT use any additive to the lube ... some people may try to tell you that you need a 'limited slip additive'... but the G80 is different, just use conventional 80W90 .. or some synthetic equivalent.

 

Careful what you say about the G80- that may be true in the truck world, but GM calls all posi's G80- the Caprice G80 was made by Auburn, had cone clutches, and definitely needed the additive. The Camaro I own has a torsen unit for the posi, again called G80 by GM- debateable about whether you need the addictive, but it doesn't hurt- I have seen Eaton ones with clutches, too, and they needed the friction modifier- just trying to make sure that someone doesn't think that all GM G80's are the same-

 

 

 

RPO G80 in a pickup truck since 1973 has meant Gov Lock. That's 37 years covered so it's pretty safe info. Your Caprice Auburn would be the same one in my 1996 9C1 and they have no clutches either. It's spring loaded cone gears that eat into carrier over time. They work well, but when they wear out the entire carrier is junk.

 

Gov Locks actually have clutch plates in them as well. They are there to aid in softening the locking action of the diff. And it is correct that GM says to just use gear oil with no friction modifier. However even if the modifer is there it's not going to stop the unit from working or not. It's simply un-needed.

 

Actually according the GM using the additive in the G80 locker can cause damage.

 

Some light duty trucks equipped with locking rear axles (G80) may exhibit rear axle chatter, especially when turning a corner from a stop.

This condition of alternate engagement and disengagement of clutches in differential assembly is usually caused by contaminated axle lubricant.

To correct this condition, drain and refill the rear axle. The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life.

Badass69 Senior Enthusiast

Badass69

Posted
Posted
yes, changing gear lube may help ... the G80 is a mechanical locker and DOES NOT use any additive to the lube ... some people may try to tell you that you need a 'limited slip additive'... but the G80 is different, just use conventional 80W90 .. or some synthetic equivalent.

 

Careful what you say about the G80- that may be true in the truck world, but GM calls all posi's G80- the Caprice G80 was made by Auburn, had cone clutches, and definitely needed the additive. The Camaro I own has a torsen unit for the posi, again called G80 by GM- debateable about whether you need the addictive, but it doesn't hurt- I have seen Eaton ones with clutches, too, and they needed the friction modifier- just trying to make sure that someone doesn't think that all GM G80's are the same-

 

 

 

RPO G80 in a pickup truck since 1973 has meant Gov Lock. That's 37 years covered so it's pretty safe info. Your Caprice Auburn would be the same one in my 1996 9C1 and they have no clutches either. It's spring loaded cone gears that eat into carrier over time. They work well, but when they wear out the entire carrier is junk.

 

Gov Locks actually have clutch plates in them as well. They are there to aid in softening the locking action of the diff. And it is correct that GM says to just use gear oil with no friction modifier. However even if the modifer is there it's not going to stop the unit from working or not. It's simply un-needed.

 

Actually according the GM using the additive in the G80 locker can cause damage.

 

Some light duty trucks equipped with locking rear axles (G80) may exhibit rear axle chatter, especially when turning a corner from a stop.

This condition of alternate engagement and disengagement of clutches in differential assembly is usually caused by contaminated axle lubricant.

To correct this condition, drain and refill the rear axle. The use of any additive in locking rear axles (G80) is not recommended. Rear axle additives are designed for use in limited slip differentials which are normally installed in cars. All light duty trucks equipped with RPO G80 make use of a locking differential and the use of additives will delay the engagement of the locking mechanism and may decrease axle life.

 

 

 

I have read that too but have also owned a pile of them that ended up with limited slip additive in them. They all worked as normal and only quit when they finally blew up. There is nothing physically in them that the additive can really affect. The flyweight will still move and the locking plate will still engage regardless of the additive. The additive has little affect on mechanical moving parts. It is just a friction modifier for the clutch discs in a conventional clutch pack limited slip.

 

Most non GM shops have barrels of oil they use for changes and generally it's a limited slip additive equipped oil. I wouldn't be too worried about it.

 

So really why Gm released that.....who knows. It's full of a lot of mays and could potentially statements. I am pretty sure that eventually GM's factory warranty will include "Shifting the transmissions shift lever from the park position and engaging power to the drive wheels will result in the owner voiding all inferred powertrain warranties".........

04JJHD Enthusiast

04JJHD

Posted
Posted

I've changed my rear end fluid in my HD and i used a quart of lucas oil stabilizer with another couple quarts of royal purple. It's ben workin good for 20,000 miles or so. You could also run some ams oil.

wild willy Enthusiast

wild willy

Posted
Posted

Yes, regardless what oil you use, synthetic, dino, whatever, good idea to periodically change it- gets hot at times, and stressed. If you check the owners manual and figure the interval on the 'severe service' timetable, probably be conservative- but much normal use is considered severe- short trips, dust, towing, About the only thing that isn't severe is long highway drives-

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