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Old 07-15-2013, 08:22 PM   #21
niznos's Avatar
Drives: 2010 2SS MT RS
Join Date: Dec 2012
Location: Mid-MO
Posts: 88
Just a bit of follow up for those keeping up with this. I finally installed the 3.91 diff a couple of days ago and set the speedo correction with the Diablosport InTune. I ran the car steady at various speeds from single digits up to 65+ and checked the speedo against a Garmin Nuvi GPS and they were identical.

As a sidebar, I installed BMR diff bushing BK029 and used Red Line gear oil (LSD additive not required) and I'm extremely happy with all of it.
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