View Full Version : which diff do i have

12-21-2008, 07:38 PM
hey was going to order a spool for my bronco but i guess there are 2 different axle splines it could have. any one know which one my truck would have its a 78 bronco it has the factory 9 inch is it a 28 or 31 spline???
thanks steve

12-21-2008, 07:48 PM
more then likely if u can figure it out from the tag or the stampings you are gonna have to pull the axle out and count

12-21-2008, 08:17 PM
If you can find the code tag or the codes off it i might be able to decode it.

12-21-2008, 08:28 PM
k thanks guy looks like im goin under my truck in the snow that sux lol ill go look tommrow

12-22-2008, 12:32 AM
It should be a 31

dirka dave
12-22-2008, 12:33 AM
One with gears in it.....:dontknow:

12-22-2008, 11:50 AM

12-22-2008, 08:49 PM
yea i was looking on the net and it should be a 31 i think but ill go check to be sure. anyone know how to de code the tag???

12-22-2008, 11:31 PM
Whats the tag say?
I should be able too.

12-23-2008, 02:55 PM
well this may be a dumb question but i dont think it has a tag. it should be on 1 of the blots that hold the third member in right? i found the casting numbers for the thrid member but no tag.

12-23-2008, 03:53 PM
casting numbers might work. My 9" doesnt have a tag either.

12-23-2008, 07:22 PM
well the 1 casting i can see is 4668A its right beside the pinion

01-10-2009, 01:01 AM
pull an axle count the splines then u know for sure