Ratio code for corperate 10 bolt

[axxxman67]

I have an 84 K5 and I need to find the gear ratio for the rear axel. The code on the axel tube is BJ3 G341 1. I have looked everywhere for a source and have had no luck. I think it may be 3.08, but I need to know for sure. I would greatly appreciate any info on a source or if anyone could tell me if this is the code for a 3.08. I have had no luck.
Thanks! /forums/images/graemlins/k5.gif

 

[dyeager535]

You'll need to get the codes out of a GM Parts manual for your year.

Haven't seen truck ones listed anywhere else. Haynes manuals did them for some GM cars, BUT the codes changed just about every year, so the Haynes wasn't right.

The easiest/best way to check ratio is pop the cover and look at the stamping on the ring gear. Even if you did deceipher the axle code, there is no guarantee, unless you are the original owner, that in the past 20 years someone hasn't swapped gears.

Allows you to change the diff fluid as well. I'd maybe make sure I could pull the fill plug before hand though! /forums/images/graemlins/smile.gif

 

[ugly_blazer]

I don't know what the numbers on the axle tube mean. You can find a RPO code on a sticker in the glove box. Look HERE for rpo codes. As dyeager535 said, don't rely on the numbers to be correct as someone may have swapped some stuff out through the years. I always pull the cover and check the numbers stamped on the ring gear.