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  1. #1

    Default How does the G80 handle mismatched tires? [Expired Topic]

    My Suburban has the G80 "locking" differential. I checked my spare tire the other day, and it's smaller than the other four tires. I know some differential traction aids don't like mismatched tires on the same axle. How about the G80? Are mismatched tires going to fool the G80 into thinking that one tire is spinning and cause it to lock up? If so, I either have to get a proper sized spare, or always put the spare on the front.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  2. #2

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    Sorry I can't help with this one. Not real familiar with the G80. I do know that it's not a good Idea to mix tire sizes on ony drive axels.

    Technology is great, when it Works,
    And one Big Pain in the Ass When it Doesn’t.
    Detroit Iron Rules, All the Rest are Just Toys.
    94 GMC Burban, 5.7L (350), 4X4, Auto
    86 GMC Burban, 350, 2 WD, Auto
    79 GMC pickup plow truck, 400, Full time 4X4, Auto
    86 Pontiac Fiero SE, 2.8L, Auto, only mid engine American car
    See a Pattern yet?

    15 year GM assembly line worker.

  3. #3

    Default

    I would be surprised if it locked up. The concern is always that they're going to spin at different speeds and one will burn out or cause other major problems. Mismatched tires are good only to get you off the road and to a tire shop.

    Steve
    10 Chevy Traverse LT AWD
    02 Chevy Trailblazer LS (110K+ miles - loaded except for 4WD - WRECKED!)
    99 Chevy Cavalier LS (105K+ miles - commuter car)
    78 Chevy Suburban Silverado (454, 3/4 ton)
    62 GMC 3/4 ton Pickup (350 police interceptor)

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  4. #4
    Sr. Engineer Aeropagus's Avatar
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    Yes, keep them the same size and rotate, rotate, rotate every 5-10K miles!
    John ~ New Mexico ~ It's all about the bowtie!
    2007 GMC Envoy & 2010 GMC Sierra

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