4t65e p0730

Have this SC 3.8 in a 99 Bonne with 4T65E.
Has 33/37 drive/driven sprockets with a 3.29 differential and a 30T reluctor. So, this should = 3.69 final.
I have been attempting to use the gear/tire wizard but not getting successful results. The original read shows the 3.29 gear. But also the 1.121 sprocket ratio? How is that? The original trans did not have that combination of drive/driven sprockets?
Anyway, when i use the wizard to get a 3.69 ratio it ony changes the Speedo>Caibration>Hardware>VSS/Rev. My 3rd gear ratio is off and I get the P0730.
Hopefully this is something silly.

Attachment 70885

All the files show 3.29, my 2000 grand prix was the same way. After you do some math the 3.29 with a 1.121 becomes 2.93 like the factory.

http://www.grandprixforums.net/threa...r+ratio+change

https://www.hptuners.com/forum/showt...r+ratio+change

See if these help you.

Thanks for the link. I went back to the gear tire wizard and entered 4.11 for the gear ratio. Bingo! Perfect 1.00 gear ratio in 3rd now.