Richmond gears parts combo kit part# 83-1041-1 and part # 49-0080-1 if you are looking at a set of 3.91's
Yukon gears C9.25-31-1 is the "Dura grip" part #
I heard some stories about the Yukon duragrip. I also have some gears in my valiant that though strong...are noisiest I've ever had. Shop sent it back for another..same amount of noise.
I noticed there are high n low lines from Richmond and motive?The motive low line has bad reviews. Ever hear of
"Inovation gears" claim to be the quietest. Made in italy 2 cut yadda yadda.
