How to determine if rear-end is Posi?
#1
How to determine if rear-end is Posi?
Hey Guys,
I'm about to go help the sis buy a used Tahoe/Yukon (2004-2006). She'll be doing some trailering with her horse so I want to be sure the truck has a Posi rear end.
How do I determine if it does have Posi, and how can I determine the rear-end gear ratio?
Thanks,
I'm about to go help the sis buy a used Tahoe/Yukon (2004-2006). She'll be doing some trailering with her horse so I want to be sure the truck has a Posi rear end.
How do I determine if it does have Posi, and how can I determine the rear-end gear ratio?
Thanks,
#2
Administrator
RE: How to determine if rear-end is Posi?
check the RPO or build codes in the glove box for one of these:
G80 9027 P AXLE POSITRACTION LIMITED SLIP
G81 9028 P AXLE POSITRACTION FULL LOCKING DIFFERENTIAL, ELECTRONIC, DRIVER SELECT
EDIT
and if you want to know what every one of those build codes means...
http://aplsweb.com/Topics/TopicPix/RPO.pdf
second EDIT the rear end ratios
GU2 8525 P RAX M AXLE REAR 2.73 RATIO
GU4 8527 P RAX M AXLE REAR 3.08 RATIO
GU5 8528 P RAX M AXLE REAR 3.23 RATIO
GU6 8529 P RAX M AXLE REAR 3.42 RATIO
GU7 8530 P RAX M AXLE REAR 2.77 RATIO
GU8 8531 P RAX M AXLE REAR 3.90 RATIO
GU9 8532 P FAX M AXLE FRONT 3.91 RATIO
G80 9027 P AXLE POSITRACTION LIMITED SLIP
G81 9028 P AXLE POSITRACTION FULL LOCKING DIFFERENTIAL, ELECTRONIC, DRIVER SELECT
EDIT
and if you want to know what every one of those build codes means...
http://aplsweb.com/Topics/TopicPix/RPO.pdf
second EDIT the rear end ratios
GU2 8525 P RAX M AXLE REAR 2.73 RATIO
GU4 8527 P RAX M AXLE REAR 3.08 RATIO
GU5 8528 P RAX M AXLE REAR 3.23 RATIO
GU6 8529 P RAX M AXLE REAR 3.42 RATIO
GU7 8530 P RAX M AXLE REAR 2.77 RATIO
GU8 8531 P RAX M AXLE REAR 3.90 RATIO
GU9 8532 P FAX M AXLE FRONT 3.91 RATIO
#3
RE: How to determine if rear-end is Posi?
in2,
Do they make the Tahoe/Yukon in an open rear end? If so, what is the build code for the open rear-end? I noticed that the two options you listed above are both Posi rear-ends.
Thanks,
CMOS
Do they make the Tahoe/Yukon in an open rear end? If so, what is the build code for the open rear-end? I noticed that the two options you listed above are both Posi rear-ends.
Thanks,
CMOS
#4
Administrator
RE: How to determine if rear-end is Posi?
I can't answer the open diff question maybe one of the other guru's Shawnvw or Shark can...
as for the 2 listed one is electroniclly controlled I would assume a part of the driver selected traction control or "StbiliTrak" and the other is the GM standard locker...
If I were to guess the G80 is probably the open
as for the 2 listed one is electroniclly controlled I would assume a part of the driver selected traction control or "StbiliTrak" and the other is the GM standard locker...
If I were to guess the G80 is probably the open
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Jacob Davenport (March 31st, 2024)
#6
RE: How to determine if rear-end is Posi?
The G81 I dont know, The only thing GM has with a selectable locker or electric locker is hummer. the G80 is what you looking for, although for pulling a trailor is not a huge helper, its helps more when taking off, in a boat lauch or mud or off camber stuff. It basically lokcs your rear whe none side starts slipping, kinda making it a posi for a bit.
Open diff is what Ford and Dodge and Jeep and those guys run, or 'limited slip' diffs.
The G80 is NOT open. It is when not being used, BUT soon as wheel spin is there it locks both tires, the others (ford nd Dodge)DO NOT. they use cluth packs...
If you want an open diff just get one with no G80 code.....
Open diff is what Ford and Dodge and Jeep and those guys run, or 'limited slip' diffs.
The G80 is NOT open. It is when not being used, BUT soon as wheel spin is there it locks both tires, the others (ford nd Dodge)DO NOT. they use cluth packs...
If you want an open diff just get one with no G80 code.....
#8
RE: How to determine if rear-end is Posi?
Watch this video to see how the Eaton G80 handles slippage better than anything else
http://www.youtube.com/watch?v=p8nAbg5suFw
http://www.youtube.com/watch?v=p8nAbg5suFw
#9
RE: How to determine if rear-end is Posi?
ORIGINAL: RonH
Watch this video to see how the Eaton G80 handles slippage better than anything else
http://www.youtube.com/watch?v=p8nAbg5suFw
Watch this video to see how the Eaton G80 handles slippage better than anything else
http://www.youtube.com/watch?v=p8nAbg5suFw
CMOS
#10
RE: How to determine if rear-end is Posi?
take it off road! if it gets stuck with one spinning in the front, and one spinning in the back, its an open diff; just make sure you have a Jeep handy to pull you out
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lol
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