As in the ratio and it's corresponding letter code stamped on the M15 housing? So far I haven't found it, but I know I saw it recently.
Edit: (light bulb went on) Doh! My own page! Maybe move them over here and sticky them?
http://www.oocities.org/eaglemania2002/axle.htmlNote the headings (Standard ~ Twingrip ~ etc.). They correspond to the chart below. Each line has 2 letters (the codes for Standard and Twingrip rearends), the ratio and last the pinion and ring number of teeth. If it goes out of whack again simply start with the "A" which is the first code (standard open rear end for 3.54 gears). The next letter is "N" for the same ration in Twingrip. Then is the ration number: 3.54 and lastly the number of teeth (11 and 39). The next letter, "F" starts the new code and the same sequence repeats for all subsequent items in chart. Hope this helps. All letter codes are the rear of the differential on the right hand axel tube boss (flat area). That is the part of diff. that the axle tube goes IN TO. Not the tube itself.
Thanks to Craig Thompson
Eagle AXLE LETTER CODE RATIO
STANDARD ~ TWINGRIP ~ RATIO ~ Pinion/Ring teeth
A ~ N ~ 3.54 ~11/39
F ~ T ~ 3.08 ~ 13/40
G ~ S ~ 3.31 ~ 13/43
H ~ U ~ 2.73 ~ 15/41
J ~ NONE ~ 2.37~ 19/45
K ~ V ~ 2.53 ~17/43
The code, incase you aren't familiar, is in the boss (I guess it's called) next to the diff. cover plate where the axle tube attaches to the pumpkin. It is the letter code stamped in the boss.