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Bigger tires on 1/2 ton axles?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by shane74, Mar 18, 2002.

  1. shane74

    shane74 1/2 ton status

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    Before I go and pop $$ for new tires, I am curious how big can I go on 1/2 ton axles (I have a D44 front and 12 bolt rear). I have 7" of lift, so I was thinkin' I'd run 36's, but I have been told that I can run 38's or 39.5's with a little fender trimming. My only question is....is that too big for 1/2 ton axels? I have heard that anything bigger than 36's and I'll start tearing up my axles REAL fast. What d'ya think?
     
  2. chaka454

    chaka454 1/2 ton status

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    What gears are you running? it really depends on that.
     
  3. SkulzNBonz

    SkulzNBonz 1/2 ton status

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    From what I've seen/heard, I wouldn't go any larger than 36's on the 1/2 tons. If you upgraded the axles themselves to stronger material, you may be able to go bigger.
     
  4. fortcollinsram

    fortcollinsram 1/2 ton status

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    With a D44 and 12-bolt, I'd go to about 36...any bigger and I'd be worried...36 will raise beat the heall out of those axles on a hardcore trail rig but would do okay for a pavement pounder...I'd feel comfortable with 36's on the trail if you upgraded to a cromoly axleshafts and upgraded the u-joints...If you wanna run bigger meats, run a locked 14 bff in the rear and a open 44 in the front (or at most and LSD) and you should be okay....That is what I plan on doing until I can afford my "custom" DynaTrac D60...so basically I will have the 44 up front for a while...

    Chris
     
  5. shane74

    shane74 1/2 ton status

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    Thanks guys! That is what I thought. Now for the next question. Will it make much difference on width? I am kicking around the idea of 36x14.5's or 36x12.5's. Will it make much difference on the width?
     
  6. René

    René 1/2 ton status

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    2 inches...
    Serious, that's a question of the rim.
     
  7. fortcollinsram

    fortcollinsram 1/2 ton status

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    Width should't matter but if you get a wide tire/rim combo... be sure to get back spacing right...I am going to be running 35x12.50 on 15x8 rims (there are on 15x10 rims now) and I am gong to run about 4 to 4.125" of back spacing which will center the load of the tire/wheel over the mounting surface... Personally, I'd stick w/ the 12.50
     
  8. shane74

    shane74 1/2 ton status

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    I need to check, but I think they're 4:11's or 4:56's. It revs pretty high at freeway speeds with 33's on it.
     
  9. shane74

    shane74 1/2 ton status

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    I'll be running 15x10" wheels. I'll make sure the backspacing is correct. I think it needs to be around 4-4.25".
     
  10. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    the only reason I feel cozy running 35" procomp MTs on my 1/2 ton axles is because they are beefy 10 bolts. Without the warn full floater, warn chrome-molys f/r, warn premium hubs etc etc I would stick with 33s and smaller. Of course, the 1 ton stuff is going in soon... so that wont be a problem anymore... /forums/images/icons/smile.gif At any rate, forget about 38s or 39.5s on 1/2 axles... those are big/heavy tires and its really just a matter of time before that 1/2 ton axle goes <BOOM> with meats that big.

    J
     
  11. Blazer1970

    Blazer1970 1/2 ton status

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    I would not run anything bigger or wider than a 33X12.50 on half ton axles. If you plan to run bigger, you will be happier in the long run if you go to 8 lug stuff now.
     
  12. Mudzer

    Mudzer 1/2 ton status Author

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    8 Lugs isn't always better. A Dana 44 with 8 Lug outers is no stronger than the 6 lugger. I will admit, a 14 Bolt Full Floater is stronger than the 12, but I have upgraded to the Warn Full Floater kit, and other mods and think the strength is comparable to a D60. I am mounting up 38"x15.5" TrXus STS tires tonight and plan to wheel Disney Oklahoma. I have been concerned with breakage because I have broken several vital parts running my 37"x13" Boggers. I would consider myself an easy driver as well. I never let the truck bounce when spinning on rocks, I never hammer the throttle and I typically pretty conservative.

    I will let everyone know after Disney how she holds up. But, I will be honest, I will probably go 1 ton someday.
     
  13. shane74

    shane74 1/2 ton status

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    I'll probably go with the 36x12.50's. I'm not into breaking my stuff and the Dana 44 is a pretty good axle. On my last truck (77 short box) I ran 35x12.50's for years w/o any problems. I'm thinking 36's ok, any biger, no way. Thanks for all the input!
     

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