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2003 chevy trailblazer_ls
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I did precisely that, and upgraded to the stronger EXT rear axle at the same time for only $430 and a half day's work for two people.
I have a few questions about this. First, I've seen some online 4wd stores list the 8.0 and 8.5/8.6 rear ends for the 02 and up TBs. So am I correct in assuming the SWB I6 have the 8.0 and only the LWB V8 have the 8.5/8.6? And second, did you reuse your stock brakes or did you change them as well? TIA.
 

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2003 chevy trailblazer_ls
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49 Posts
Thanks for the info roadie! I've searched for awhile to get a difinite answer. Does the 97x also have the 8.6"? There is a 3.73 unit close to me with 15k for 400 bucks. My reason for upgrading to the 8.6 is the choices for the posi unit. I know some have had good luck with the gov lock... but I'm not a fan. The 8.5 gov lock in my S10 only lasted 15k before giving up.
 
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