Please tell me what parts interchange between the 2.45/2.25 vice 2.71->up 8 1/4 axle

2 series refers to 2.xx gears and carriers and 3 series refers to 3.xx gears and carriers. The 2.94 carrier is considered to be in the 3 series carrier set I believe.[/
Ok so that’s what it means as long as it says 3 series I’m good its ca like 165 for some Richmond
2 series refers to 2.xx gears and carriers and 3 series refers to 3.xx gears and carriers. The 2.94 carrier is considered to be in the 3 series carrier set I believe.