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Awesome, thank you for your help!

I have a 3.29 diff. Do you recommend the tire/gear wizard method or changing the gear ratio method?

@TheMechanic, thank you for the explanation! My drive gear is 33T and the driven gear is the 37T so my ratio is .892, but I get the point. I changed the ratio in the tire/gear wizard to .892 and it...

How do I figure out the correct gear ratios to input? I installed a 33T drive gear and a 37T driven gear with a 3.29 differential. The gears I took out were 35drive, 35 driven.

Thank you for your reply. I am not familiar with BlueCat? I have HP Tuners MPVI3. I do want to note that this is a racing application so I don't really care if the speedo is off....

Hi Everyone,

I have changed the drive/driven gears inside the transmission of my 2008 Impala, 4T65E. Will I need to change anything in the tune file to accommodate this change?

Nobody wants to help?:(

Hello Everyone,

I will start by saying I am very new to the tuning world (My MPVI3 is on the way) but I wanted to gather as much info as possible. I am looking for a good starting point to get...