I know some of you are interested in factory markings so I'm posting these for you & posterity. This is from a '73 Dodge Challenger Ralley 340. Gears are open 3:55 ratio springs are 4-leaf
White paint dobs & the #
31 appears to be white
Also notice the Black anodized pinion snubber bolts, the snubber plate shows silver, not paint but natural.
Dark blue, I'm guessing thread lock, on the studs
Black paint on the hanger
# on the front passenger side ....can't make out the 1st digit
_ 0 1 4# on the front divers side, upside down & underlined light blue or turquoise , cant make out the 1st digit
_ 1 2 J# on forward divers side spring yellow last digit obscured
5 9 _ # on rear drivers side spring yellow
1 2 4 and I think the last character is
" Center is a yellow circle with
J sideways on the drivers side a stenceled white
R I cant make out the character but another circle in white may be a
G or
6