I tryed searching but the search function but the stupid thing doesn't want to work for me. All I want to know is if I can put 35 spline axle shafts into an 1972 Early Bronco 9"? Or am I stuck with 31 splines as an option?

You are stuck with 31 splines as max. You would need big bearing ends as well as a different case to go to 35 spline.

Phase3 of my buildup in two years planned to have a full width 40 spline 9". Front will be a 60. Figure i should be all good for 42s on my EB.

But like he says, different case.

Originally posted by dittohead
You are stuck with 31 splines as max. You would need big bearing ends as well as a different case to go to 35 spline.

Depends on weather or not he has a small or large bearing housing now, but you're right, more than likely its a small. But no matter what you will need a new carrier.

I have a factory case in my EB right now with 3.250 carrier bearings, just like an aftermarket carrier. Does this mean i can go to 35 spline? Its out of an old lincoln car or something:confused:

what sixe are the holes in the axel brake flange?
this will tell you big or small bearing.

Originally posted by dittohead
I have a factory case in my EB right now with 3.250 carrier bearings, just like an aftermarket carrier. Does this mean i can go to 35 spline? Its out of an old lincoln car or something:confused:



i have a 9" from the same year and truck. i was told that in order to go 35 spline, you need to replace the 3rd member. and that is all. good luck. because i am a dipshit, i only went 31 spline at the time. if i could only go back...

Originally posted by OH CANADA
I tryed searching but the search function but the stupid thing doesn't want to work for me. All I want to know is if I can put 35 spline axle shafts into an 1972 Early Bronco 9"? Or am I stuck with 31 splines as an option? You'd probably want to upgrade to the heavier gusseted '76-'77 housing anyway and yes, you'll need another 3rd that uses the larger carrier bearings to accommodate the 35 spline carrier:eek: So, why not just go with a Warn 31 spline full floater it'd probably cost less than having to round up all the additional parts to assemble a 35 spline set up and probably be just as strong (or stronger:eek: ) than a 35 spline semi-floater anyway. I love mine!:D When I upgraded mine from the original 28 spline setup, I just swapped out the side gears in my 28 spline D/L and saved the cost of a new locker too ;) ........Hans