Rear Axel Spline Count?

[Gordys74]

I'm wanting to change the gearing in my diffs and have been looking for rebuilt 3rd member for the rear. I need to know what the spline count is on the rear axels. I have a stock 74, big bearing, 302, auto. Does anyone know what they had for axels? Spline count wise? Thanks!

 

[chris]

28 Spline was factory stock.

If you plan to keep skinny tires on it and light offroading your ok, if not move up to 31 spline axle shafts.

 

[Gordys74]

Its uncut, so I won't be putting any BIG tires on it and I just moderatly offroad it and thats seldom. Just didn't know if there was any difference in BB and Lb rearends. Don't quite understand why they would put bigger bearings on the same size axel, but I'm not an engineer either. ;D I'm wanting to replace the 4:11 gearing with 3:50s for better gas mileage so it is mostly a hiway hog. %)
Thanks!

 

[Scott M]

gordys74

i'll take those 411s. email me w/ some info if ya want. bronco069@hotmail.com

 

[SaddleUp]

Its uncut, so I won't be putting any BIG tires on it and I just moderatly offroad it and thats seldom. Just didn't know if there was any difference in BB and Lb rearends. Don't quite understand why they would put bigger bearings on the same size axel, but I'm not an engineer either. ;D I'm wanting to replace the 4:11 gearing with 3:50s for better gas mileage so it is mostly a hiway hog. %)
Thanks!

They did it for stronger bearings which increases the load capacity. All EB's originally came with 28 spline axles.

 

[cynrays]

The only way that you can know for sure is to count the splines by pulling an axle. I thought mine were a 31 until I counted them....

 

[Gordys74]

Ok, thanks guys! I can start looking around for parts and see what, if anything, I can find.