My freind done a t56 swap into his 02 2wd 4l60e sierra everything was perfect but we faced a problem regarding spedometer + gasoline gauge what i read through many forums that i need a 40 Tooth reluctor ring to correct the spedometer but i did not know where to buy it so i need your help guys + the gasoline gauge is fluctuating .

 

Tried this thread?

 

I saw this thread but with more than 650 threads on it i could not get the info i am looking for.

 

If you have HPT or EFILive you should be able to go into your speedo section and change the PPM to match the 17 tooth reluctor that is in the T56. You'll just need to do the math to figure out the correct values.