rearend id

[thomasbailey]

i have an 81 k10 customdeluxe was my grandpas. he bought it new im trying to get info on this thing. the rearend has a strange code i havnt been able to decode yet RCH 062W11. i would use the glove box code but has long since been faded out. what i wanna know is the gearing thats in it. yes i know that i could have been changed but seeing as my grandps lost his feet in 1986 and stopped driving it, so it sat in his shop till december when i pulled it out. the tags expired in jan 87' i doubt that the rearend was messed with. also on a side note i havnt been able to even find id codes on my front axel where would a guy look for them? i think the thing has 3.08 gearing or 2.73 cause it just has no power at all to shift with the poor straight six in it. plz any help or direction to id this gearing would be awsome. ive spent hours on this thing i even called the dealer who said sorry i have no info on it