3:50 ratio?

[fireplug]

I know you guys answer these questions all the time so hopefully you won't mind yet another. I'm trying to help a guy ID his axle, got the following;

2GM14012196 13 42 12 80 so if I'm correct you divide 42 by 12? That would mean a 3:50 ratio. Does that even exist, or did he give me the wrong numbers?

Along the same lines, I'm pretty sure it is a 14 sf as it has 8 bolt wheels, 14 bolts on the pumpkin but what throws me off is that the pumpkin is definitely smaller than my 14bff, most notably the bottom edge appears to have less of a 'point'. Does the semi float have a different pumpkin, or is this another axle?

Thanks guys. Jason.

 

[pauly383]

How about 13/42 which is 3.23 gears . There were 3/4 tons in the mid 80's available with 3.23's for sure though

 

[4X4HIGH]

Pauly is correct, there are 13 teeth on the pinion gear and 42 on the ring gear so divide 42 by 13 and you get 3.23:1 gearing which is available and also a rare ratio to find. The 12 80 is the production date meaning December of 1980.

 

[divorced]

Along the same lines, I'm pretty sure it is a 14 sf as it has 8 bolt wheels, 14 bolts on the pumpkin but what throws me off is that the pumpkin is definitely smaller than my 14bff, most notably the bottom edge appears to have less of a 'point'. Does the semi float have a different pumpkin, or is this another axle?

Look for 8 bolts holding an axleshaft in the hub. If it has the 8 bolts it is a FF, if the axle looks like a 10 or 12 bolt then it's a SF.

 

[fireplug]

yeah it's definitely a semi float, I just couldn't understand the seemingly lower profile of the pumpkin. Thanks for the ratio help. Jason.

 

[pauly383]

The ring gear is smaller than a full floater , thats why the pumpkin is smaller

 

[fireplug]

Oh I thought they were the exact same beast other than the obvious. Being a noob is tough, sooooo much to learn. Cool thanks.

 

[pauly383]

Don't worry about it . Keep bugging us with questions , read everything you can get your hands on , and enjoy your trucks