rear axle identification

[Knuckledragger]

This axle is not from an IDI, but is from a 1992 F350. I am trying to ID it from the tag. Any help will be greatly appreciated. I got a photo of the tag, so a couple of digits are not clear.

Top row: S1310 (or S131D?)

Second row: L10 10 2 20 (or 2D?)

My best guess is that it is a Sterling with 4.10 gears, since most id tags I have ever seen were not made to be secretive, but informational. It has disc brakes, so I am interested in installing it on my 87 F350 4x4 if everything else is okay.

If this post is in the wrong place, please move it. Thanks!

 

[chillman88]

Second row is probably 4L10 which would be a limited slip 4:10. 1992 should be a sterling 10.25

 

[chillman88]

Wait... It must have aftermarket disk brakes? Unless someone transplanted it from another truck?

 

[nelstomlinson]

Pop the cover off and count the teeth on the ring and the pinion? If it's off the truck, that should be pretty easy.

 

[Knuckledragger]

Pop the cover off and count the teeth on the ring and the pinion? If it's off the truck, that should be pretty easy.

I am doing the ID from 80 miles away, to determine if I want to buy it.. Pretty sure it is 4.10 LS. Not sure if disc brakes are stock. Should be long spline, though?

 

[IDIoit]

92 is when they went to the long spline pinion.
make sure its not a 8 lug FSD?
take a tape measure and measure the spring pads. ~37" truck, C&C will be narrower? like 34 iirc
aftermarket disc will have a GM style calipers and a caliper compression style e-brake.
and internal drum e-brake is 99+?
I may be wrong, but any factory rear disc pre 97 for 3/4 ton + will have a brake on the back of the trans?

sound solid?. its sunday morning meds over here

 

[gandalf]

Possible help, maybe?

Ford Axle ID

 

[Knuckledragger]

Possible help, maybe?

Ford Axle ID

Yes, I saw that a little earlier. It says on page 10 that S131D is 4.10 LS. installed on 90-97 F250. This truck, I am told, was a 92 with 5.8 (gasser). Is there any sure way to tell a long spline pinion without taking off the trunion?

I think the truck is gone, so no telling about a trans mounted brake. Any opinions on after market discs? I would like to use them if possible.

My truck is a UV (cab and chassis), has the short axle and narrow spring mounts, but no bed or anything behind the cab yet. I could weld on new spring mounts to use a SRW setup.

 

[IDIoit]

can absolutely remount spring pads. did it on my 71
i give the pinion a few more degrees up on the pinion while youre at it to help axle wrap.

have no input on pinion yoke. ive only had the shorts.

 

[Knuckledragger]

92 is when they went to the long spline pinion.

Great!

make sure its not a 8 lug FSD?

Okaay, you lost me there. FSD?

Also, when did Ford go to metric? Some 97-98 were 7 lug, not sure if the metric bolt circle started before or after.

 

[Knuckledragger]

Whoa, Nellie. According to the ID list, S131D came out of a F250, not F350 as I was told. This is not a full floater, not made for 8500+gvw, not sure it is a Sterling 10.25, although the ring gear is listed as 10.25. What the heck.

Did Ford put some version of Sterling in the F250 in 92?

 

[snicklas]

Yes, there was a semi-float (car style) 10.25 in some of the regular cab gasser F-250's in that era.

Lugs went to metric in 97 for the F-150 and Light Duty F-250 (7 lug trucks), this one was a 10.25/50 semi float. 99+ SuperDuty was metric 8x170mm. That changed again in I think 08, then again in the newer trucks.....

So there very well could be a Semi-Float 8 lug out of an 92..... but even at that, it wouldn't be disk.... That was a 97/99 Change also.....

 

[Knuckledragger]

Yes, there was a semi-float (car style) 10.25 in some of the regular cab gasser F-250's in that era.

Lugs went to metric in 97 for the F-150 and Light Duty F-250 (7 lug trucks), this one was a 10.25/50 semi float. 99+ SuperDuty was metric 8x170mm. That changed again in I think 08, then again in the newer trucks.....

So there very well could be a Semi-Float 8 lug out of an 92..... but even at that, it wouldn't be disk.... That was a 97/99 Change also.....

Now, the question is: is it a real Sterling inside? I have a short spline rear that is pretty messed up (wobbly pinion/yoke) and if things fit, I could transfer the gears and yoke to my existing full floater. Plenty of work, but desired results. Will it work?

 

[Garbage_Mechan]

I have both long and short pinion sterlings here. I’m sure a way to tell by measuring is possible. If still replacement I could measure.
As far as I know the only factory disc brake with 8x6.5 lug pattern is from vans around 98 to 03 or so. But I believe they had Dana 60’s. It has been done to swap the van brakes to the pickup sterling, have to weld on flanges.

 

[snicklas]

Now, the question is: is it a real Sterling inside? I have a short spline rear that is pretty messed up (wobbly pinion/yoke) and if things fit, I could transfer the gears and yoke to my existing full floater. Plenty of work, but desired results. Will it work?

That, I don’t know. I was never inside the axle on Dad’s truck.