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Until you adjust the tire constants in your pcm, your speedo will read 3.4% too SLOW.I have a day to decide whether to stick with the the 265/70R16, or try 265/75R16.
Until you adjust the tire constants in your pcm, your speedo will read 3.4% too SLOW.
When speedo says 85MpH, actual = 88MpH
When speedo says 55MpH, actual = 57MpH
When speedo says 25MpH, actual = 26MpH
Thanks Marky! Yeah, I’ve dealt with that before… back in the old days before PCMs and computers. Reprogramming the PCM is outside my wheelhouse. I guess I can either find someone who can do it or do the math.
Thanks for the advice Marky! I’d be surprised if I can’t find resources locally. I’m in Austin TX, which is a very tech savvy city. It’s just I’m an old dog.I personally recommend pcmperformance.com.
That said, you don't need a tuner who's been tuning since '05 to improve your powertrain's durability and performance.
Plenty of other tuners with solid reputations.
If you are close enough to one, meet them halfway, have them tune your pcm in person in realtime. YOU WILL NOT REGRET IT.
Thanks for your comment TahoeRestore! I checked out your posts. Nice job on documenting your restoration. Your pics remind me of when I’ve gone through the same process with muscle cars. I don’t foresee a restoration in my vehicles near future. I travel on unpaved roads way too often and I’d be paranoid of stone chips and scratches.Welcome to the forum. I recently finished a complete steering and suspension (except springs and torsion bars) restoration on my 2003 Tahoe which has 160 K miles and the ZW7 Premium Smooth Ride option. My steering was getting really loose and one of my rear shocks (Nivomats) was leaking. I replaced both with Nivomats (SACHS 030239 @ $280 each). The job totaled $2K for quality parts (mostly Moog) and 5 days in my garage. You can also view my exterior (paint & lighting) restoration in another post. Let me know if I can help with any information.