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.
99 Bonneville 3.8 SC.hpt