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2007 G80 Rearend Question

Xtremski74

By Xtremski74
in Ask A GM Technician

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Xtremski74 Enthusiast

Xtremski74

Posted
Posted

My dealer has no clue of the answer to these questions. So, here I am. I used to own a 2000 Silverado 1500 with the G80 Rearend. When it used to "lock" I could feel it and it stayed "locked" until the gas pedal was let off on.

 

Now I own a 2007 Silverado 1500 with the G80 Rearend. I have noticed that one, the rearend doesn't seem to have the same "lock" feeling that the 2000 had. Second, it seems to take alot longer(more tire spin) to "lock" in. The tires are kinda crappy that the dealer put on it. They are Perelli Scorpion STR's which seem to be a cheapy high mileage tire. Can the tires be the blame for the delay? Is the newer G80 set up different then the older ones? Hopefully, you guys will have an answer for me that me Dealer couldn't. Oh, one more, Why doesn't the new G80's have the Limited slip tag on them like my 2000 did?

 

Thanks So Much,

Jason F.

jro909 Senior Enthusiast

jro909

Posted
Posted

you may just not feel it, being that its a newer truck the g80 design may have been updated to be alot smoother,

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
My dealer has no clue of the answer to these questions. So, here I am. I used to own a 2000 Silverado 1500 with the G80 Rearend. When it used to "lock" I could feel it and it stayed "locked" until the gas pedal was let off on.

 

Now I own a 2007 Silverado 1500 with the G80 Rearend. I have noticed that one, the rearend doesn't seem to have the same "lock" feeling that the 2000 had. Second, it seems to take alot longer(more tire spin) to "lock" in. The tires are kinda crappy that the dealer put on it. They are Perelli Scorpion STR's which seem to be a cheapy high mileage tire. Can the tires be the blame for the delay? Is the newer G80 set up different then the older ones? Hopefully, you guys will have an answer for me that me Dealer couldn't. Oh, one more, Why doesn't the new G80's have the Limited slip tag on them like my 2000 did?

 

Thanks So Much,

Jason F.

Your G80 only stays locked until you hit about 40km/h...about 25MPH...at that speed, it will unlock...also about 3 rotations of the diff without slippage will unlock the diff.

it only engages when 100 rpm differential speed between both sides is "detected".

If your truck had a limited slip tag on the rear it likely didn't have a locker in it...it was most likely a clutch type LSD, and that's why it acted much differently...the RPO code G80 is for a limited slip rear axle, weather that's an LSD or a locking rear they both fall under the same code. If you had an LSD rear, being a truck rear, it would have fairly heavy springs and would take a lot for the clutches to slip out....GM could have changed something for the NNBS trucks to make them a little softer though...who knows.

 

The mechanical locker made by Eaton, which is commonly referred to as a G80, is years old and hasn't really been updated...much like its stronger, larger, heavier duty cousin the Detroit Locker.

Xtremski74 Enthusiast

Xtremski74

Posted
  • Author
Posted

Thanks for the replies. That makes sense that it would be smoother in the NBS seeing as though they are trying to make them more "car like" of a ride. Your right I may not be realizing it is "locking" as easy in the newer one. I have to say these trucks are way quieter inside then the older body style. Which I like! Thanks again!

KMGZ400 Senior Enthusiast

KMGZ400

Posted
Posted
My dealer has no clue of the answer to these questions. So, here I am. I used to own a 2000 Silverado 1500 with the G80 Rearend. When it used to "lock" I could feel it and it stayed "locked" until the gas pedal was let off on.

 

Now I own a 2007 Silverado 1500 with the G80 Rearend. I have noticed that one, the rearend doesn't seem to have the same "lock" feeling that the 2000 had. Second, it seems to take alot longer(more tire spin) to "lock" in. The tires are kinda crappy that the dealer put on it. They are Perelli Scorpion STR's which seem to be a cheapy high mileage tire. Can the tires be the blame for the delay? Is the newer G80 set up different then the older ones? Hopefully, you guys will have an answer for me that me Dealer couldn't. Oh, one more, Why doesn't the new G80's have the Limited slip tag on them like my 2000 did?

 

Thanks So Much,

Jason F.

Your G80 only stays locked until you hit about 40km/h...about 25MPH...at that speed, it will unlock...also about 3 rotations of the diff without slippage will unlock the diff.

it only engages when 100 rpm differential speed between both sides is "detected".

If your truck had a limited slip tag on the rear it likely didn't have a locker in it...it was most likely a clutch type LSD, and that's why it acted much differently...the RPO code G80 is for a limited slip rear axle, weather that's an LSD or a locking rear they both fall under the same code. If you had an LSD rear, being a truck rear, it would have fairly heavy springs and would take a lot for the clutches to slip out....GM could have changed something for the NNBS trucks to make them a little softer though...who knows.

 

The mechanical locker made by Eaton, which is commonly referred to as a G80, is years old and hasn't really been updated...much like its stronger, larger, heavier duty cousin the Detroit Locker.

 

 

mine unlocks after exactly 20 mph

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
My dealer has no clue of the answer to these questions. So, here I am. I used to own a 2000 Silverado 1500 with the G80 Rearend. When it used to "lock" I could feel it and it stayed "locked" until the gas pedal was let off on.

 

Now I own a 2007 Silverado 1500 with the G80 Rearend. I have noticed that one, the rearend doesn't seem to have the same "lock" feeling that the 2000 had. Second, it seems to take alot longer(more tire spin) to "lock" in. The tires are kinda crappy that the dealer put on it. They are Perelli Scorpion STR's which seem to be a cheapy high mileage tire. Can the tires be the blame for the delay? Is the newer G80 set up different then the older ones? Hopefully, you guys will have an answer for me that me Dealer couldn't. Oh, one more, Why doesn't the new G80's have the Limited slip tag on them like my 2000 did?

 

Thanks So Much,

Jason F.

Your G80 only stays locked until you hit about 40km/h...about 25MPH...at that speed, it will unlock...also about 3 rotations of the diff without slippage will unlock the diff.

it only engages when 100 rpm differential speed between both sides is "detected".

If your truck had a limited slip tag on the rear it likely didn't have a locker in it...it was most likely a clutch type LSD, and that's why it acted much differently...the RPO code G80 is for a limited slip rear axle, weather that's an LSD or a locking rear they both fall under the same code. If you had an LSD rear, being a truck rear, it would have fairly heavy springs and would take a lot for the clutches to slip out....GM could have changed something for the NNBS trucks to make them a little softer though...who knows.

 

The mechanical locker made by Eaton, which is commonly referred to as a G80, is years old and hasn't really been updated...much like its stronger, larger, heavier duty cousin the Detroit Locker.

 

 

mine unlocks after exactly 20 mph

 

Knew it was somewhere around there....Thought it was 25...my bad.

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