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uchi

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uchi Enthusiast

uchi

Posted
Posted

with this crap

 

 

 

 

 

in the g80 videos it shows the gmc trucks as being superior than all the others they listed on the same type of traction less surface, but now theyre saying a limited slip diff will out perform a true locking diff. from the looks of the one test the gmc was starting to get up the hill and they let off the gas.

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

All depends on how the test is being done. The G80 can be tricky to make lock up, it it does at all. The G80 in my '03 was garbage, so a properly functioning LSD would be better. Plus, the G80 video was either done by Eaton or GM, so of course they'll make their product look better. This (the first video) is supposed to be an independent test.

flhusa1 Enthusiast

flhusa1

Posted
Posted

the g80 is a true locker. the bad part it only stays locked to 20 mph. if you do not service your g80 rear end it will not perform as designed. never put gear oil that has additives for a limited slip rear end. mobil 1 is a no no. you can buy gm oil for it or do like i did and use synthetic gear oil made for the riceburner cars manual transmissions. make sure you use synthetic oil without limited slip additives. oil has to changed at regular intervals for the mechanism to function properly. i know i never changed my oil since new and it stopped locking. cleaned and changed the oil and now it is working fine. after watching their video anybody from the old school knows all you have to do is put the parking brake on slightly which fools the differential into thinking it has equal traction and would allow every one of those trucks to go up their hill.

Matt_ Senior Enthusiast

Matt_

Posted
Posted

I've tested my G80 in places where i know for a FACT that a LS won't make it up.

 

Get one of those rear tires in the air and i guarantee none of those trucks will go anywhere.

 

It's all in the test.......

chakis24 Senior Enthusiast

chakis24

Posted
Posted
the g80 is a true locker. the bad part it only stays locked to 20 mph. if you do not service your g80 rear end it will not perform as designed. never put gear oil that has additives for a limited slip rear end. mobil 1 is a no no. you can buy gm oil for it or do like i did and use synthetic gear oil made for the riceburner cars manual transmissions. make sure you use synthetic oil without limited slip additives. oil has to changed at regular intervals for the mechanism to function properly. i know i never changed my oil since new and it stopped locking. cleaned and changed the oil and now it is working fine. after watching their video anybody from the old school knows all you have to do is put the parking brake on slightly which fools the differential into thinking it has equal traction and would allow every one of those trucks to go up their hill.

 

 

you know, that is such an obvious thing to do now that you mention it- but i never would have thought of it. i'll have to remember that one.

svt2205 Enthusiast

svt2205

Posted
Posted

Newbie and researching a potential change of brand, but is the G80 the auto locking rear end I have seen on Silverado/Sierra 1500 window stickers? And is this the same design or maybe the same assembly that is in the 2500?

 

Thanks

uchi Enthusiast

uchi

Posted
  • Author
Posted

would i be best off to go visit gm for the specific fluid for it? my truck is at about 64000 km now so id like to get it changed over for some new fluid, make sure she keeps working as ive noticed at times it wont lock up. i think the best test for that locker would have been the twist ditch test they did in the one video, see how well the lsd trucks can handle one wheel having absolutly no traction :thumbs:

MikeNH Senior Enthusiast

MikeNH

Posted
Posted
I've tested my G80 in places where i know for a FACT that a LS won't make it up.

 

Get one of those rear tires in the air and i guarantee none of those trucks will go anywhere.

 

It's all in the test.......

Out of curiosity how old was the truck? Like I said, on mine the operation was unpredictable at best. They may work great when new but even when I got my truck with 32k on it that first winter (truck was purchased in November if memory serves) it didn't work well at all on my snowy driveway. But yes, I'd agree that when functioning and all else being equal, the G80 will get a truck out of places a LSD cannot.

 

 

And SVT- the G80 is the auto locking diff. GM uses RPO codes for every option on the vehicle and the G80 is the code for this differential. It is also called a Gov-Lok/Lock.

GasHog369 Senior Enthusiast

GasHog369

Posted
Posted

My truck does great locking up when it needs to and unlocking when not... You want it for traction starting off, but if you are allready going to fast it will not engage or it will become a diff bomb.

uchi Enthusiast

uchi

Posted
  • Author
Posted

my only complaint about it is when i come into a clow speed corner and loose traction and it locks up on my and sends the ass into the oncoming traffic lane, other than that its not bad. but from the videos ive seen they dont engage right away, and the 100 rpm wheel speed difference must be more than just a little bit of traction loss. all in all its fdragged me out of quite a few slippery situations, except for this one driveway i turned around in and the bastard just wouldnt lock, tried it a few times and it wouldnt engage. so i think its time for a fluid change. you guys have a link for proper cleaning of this thing? id rather have my mechanic do it than pay double and have gm do it.

uchi Enthusiast

uchi

Posted
  • Author
Posted

what are you using in yours? royal purple? and how much does it take? im almost due for an oil change so ill do this at the same time

the g80 is a true locker. the bad part it only stays locked to 20 mph. if you do not service your g80 rear end it will not perform as designed. never put gear oil that has additives for a limited slip rear end. mobil 1 is a no no. you can buy gm oil for it or do like i did and use synthetic gear oil made for the riceburner cars manual transmissions. make sure you use synthetic oil without limited slip additives. oil has to changed at regular intervals for the mechanism to function properly. i know i never changed my oil since new and it stopped locking. cleaned and changed the oil and now it is working fine. after watching their video anybody from the old school knows all you have to do is put the parking brake on slightly which fools the differential into thinking it has equal traction and would allow every one of those trucks to go up their hill.

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