Re: stock ford 9 inch locker spine count.

fordman460 on Tue 20 Apr - 9:11

whatbumper wrote:
Maddmattmustangs wrote:thanks for the reply guys. Found a 71 mach 1 locally that a friend of mines father owns. going to go check it out and see if its got a 9 in.

Coug, Im assuming that the heavier 3/4 ton trucks are probably the ones with the 31 spline?

the only trucks with 9" rears were 1/2 ton. you can find then well into the 80's. bronco's only had 28 spline axles for most of the 60's and 70's but could be both in the later build dates but like Coug said in the trucks there really is no rhyme or reason to application.

if you're concerned about big bearing housings or small bearing housings you can look at the lug nuts for an easy reference. the big bearing housing had half inch studs and small bearing housings had 3/8 studs.

a little more fyi

Lug nuts? You mean the backing plate studs don't you?

whatbumper on Tue 20 Apr - 9:28

yep.

good catch. had people talking to me when I typed.

backing plate bolts is what I was thinking. the small bearig housings use a 9/16" wrench and the big bearing housings use a 3/4" wrench.

I fixed it above too.

Maddmattmustangs on Tue 20 Apr - 9:30

alright sounds good!
looks like i need to bring a few wrenches to the junkyards Very Happy

whatbumper on Tue 20 Apr - 9:32

I got in a hurry typing earlier. please make sure to check the backing plate bolts. I wasn't really thinking axles when I typed that above, i was thinking a bare case. I fixed it above. Thanks fordman460! Very Happy

Maddmattmustangs on Tue 20 Apr - 9:55

will do. hopefully ill be back in the junks digging for parts wednesday Smile

bosshoss on Tue 20 Apr - 11:42

Not all big bearing ends have 1/2 bolts. I have seen just as many with 3/8 as well. Then of course there is the weired Torino big bearing end with 3/8 bolts and a different bolt pattern? Never could figure out the sense in that one but they are out ther none the less. I would be looking at the size of the tubing at the outside end of the housing. The small bearing ones will be smaller. The big ones will be 3" at least right out to the bearing.

dkp

DILLIGASDAVE on Tue 20 Apr - 21:35

bosshoss wrote:Not all big bearing ends have 1/2 bolts. I have seen just as many with 3/8 as well. Then of course there is the weired Torino big bearing end with 3/8 bolts and a different bolt pattern? Never could figure out the sense in that one but they are out ther none the less. I would be looking at the size of the tubing at the outside end of the housing. The small bearing ones will be smaller. The big ones will be 3" at least right out to the bearing.

dkp

This is true, there are two 3.150" "big bearing" housing ends. One has small bolts & the other big bolts.

And not all big bearing axles had the common closed/sealed ball bearing, some had the PITA tapered axle bearings that when the bearing fuuked up/burned-up & came apart the tapered bearing outer race would weld it's self to the inside of the housing end. Mad

duff429 on Wed 21 Apr - 1:39

i have a factory locker rear end. 31 spline. also you can tell if its 31 spline if the stud flange has "1" big hole vs 2 like 28 spline. dont get truck axles or you will have to get new rims . also i think its anything with a 351 or bigger has a 9 inch. for the torinos

whatbumper on Wed 21 Apr - 8:37

Good info duff429.