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Old February 25th, 2009, 09:24 PM   #1
BigTony
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Default 40 spline 9 inch

Does anyone know if you can use stock bearing ends?
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Old February 25th, 2009, 09:48 PM   #2
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I believe you can use big bearing ends and maybe stock bearings.
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Old February 25th, 2009, 09:56 PM   #3
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I'm running new style ford big bearing ends with 40-spline Moser semifloats.
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Old February 25th, 2009, 10:07 PM   #4
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Quote:
Originally Posted by JohnnyJ View Post
I'm running new style ford big bearing ends with 40-spline Moser semifloats.
Do your ends look like this?
http://www.evilmonkeymedia.com/jeep/609/reartruss1.jpg

Mine are big bearing, and I was under the impression they were the Torino style, but these have .5 holes instead of .375. I ordered late style big bearing retainers and they do not fit
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Old February 25th, 2009, 10:34 PM   #5
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from memory, yes.

I haven't had it apart in a year or so and it's been a few more since we built it up.

edit: here's a couple of the best pics I could find:
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Old February 27th, 2009, 12:01 AM   #6
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Man, I have yet to break vintage 31 spline shafts with 38.5's. I couldn't imagine what these could hold up to.
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Old February 27th, 2009, 09:08 AM   #7
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35-spline is 1.5"

40-spline is 1.708"

Set 20 bearings are 1.562" ID. (OD is 3.15")

Therefore, stock bearings won't fit a 40-spline axle shaft unless the shaft is machined down to 35-spline diameter (but then why run 40-spline?).

So to use a 40-spline shaft you'll need a 3.25" bearing case, big bearing ends (3.15") and you'll have to use a ball-type bearing instead of the tapered roller bearing (like Set 20). The drawback to the ball-type bearing is that it's great for the straight line guys, but bad for anything that takes a side load.
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Old February 27th, 2009, 09:15 AM   #8
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Quote:
Originally Posted by Monkeyevil View Post
Do your ends look like this?
http://www.evilmonkeymedia.com/jeep/609/reartruss1.jpg

Mine are big bearing, and I was under the impression they were the Torino style, but these have .5 holes instead of .375. I ordered late style big bearing retainers and they do not fit
There are 3 different bearing retainers available.

The small bearing retainer is 2" x 3.375" w/ 3/8" holes.

The medium bearing is 2" x 3.562" w 3/8" holes

The big bearing is 2.375" x 3.5" w/ 1/2" holes

Most of the Torinos used the medium bearing 88128-RA. While the trucks usually used the big bearing Set 20. The medium bearing is considered the first type of "big bearing" and the big bearing is considered the second type of "big bearing".

Last edited by Jeeperz Creeperz; February 27th, 2009 at 09:19 AM.
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Old February 27th, 2009, 09:41 AM   #9
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some good info guys!! tony what ya doin? guess me and joel need to take a run to your house.
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Old February 27th, 2009, 03:18 PM   #10
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Quote:
Originally Posted by Jeeperz Creeperz View Post
The drawback to the ball-type bearing is that it's great for the straight line guys, but bad for anything that takes a side load.
I've been running my axle for almost 5 years now on 39.5 Iroks and I'm not very nice to the jeep and the bearings are holding up fine. That is longer than the bearings on my stock D44 lasted.

If they were to blow out on my next trip, I woudln't feel that they owed me anything.
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Old February 27th, 2009, 10:39 PM   #11
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Quote:
Originally Posted by Jeeperz Creeperz View Post
There are 3 different bearing retainers available.

The small bearing retainer is 2" x 3.375" w/ 3/8" holes.

The medium bearing is 2" x 3.562" w 3/8" holes

The big bearing is 2.375" x 3.5" w/ 1/2" holes

Most of the Torinos used the medium bearing 88128-RA. While the trucks usually used the big bearing Set 20. The medium bearing is considered the first type of "big bearing" and the big bearing is considered the second type of "big bearing".
Sweet, thanks for the info.
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Old February 27th, 2009, 11:06 PM   #12
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Quote:
Originally Posted by Jeeperz Creeperz View Post
There are 3 different bearing retainers available.

The small bearing retainer is 2" x 3.375" w/ 3/8" holes.

The medium bearing is 2" x 3.562" w 3/8" holes

The big bearing is 2.375" x 3.5" w/ 1/2" holes

Most of the Torinos used the medium bearing 88128-RA. While the trucks usually used the big bearing Set 20. The medium bearing is considered the first type of "big bearing" and the big bearing is considered the second type of "big bearing".
I got a bunch of parts from a 1/4 mile guy, and it looks like he gave me the wrong bearing ends. I'll call strange monday. thanks for the info.
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Old February 28th, 2009, 05:36 AM   #13
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Not exactly the same comparison but I ran the early Bronco axle for a while that had the small bearing ends. I upgraded to 31 spline so I had to use the ball bearing style bearings. I blew out at least one a year because of side loading.

John, yours isn't a 9" is it?
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Old February 28th, 2009, 07:46 AM   #14
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Quote:
Originally Posted by whiterhino View Post
John, yours isn't a 9" is it?
nope, 60, but I use the ford ends and I think the shafts are pretty much interchangeable.
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Old March 1st, 2009, 12:53 PM   #15
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Quote:
Originally Posted by JohnnyJ View Post
I've been running my axle for almost 5 years now on 39.5 Iroks and I'm not very nice to the jeep and the bearings are holding up fine. That is longer than the bearings on my stock D44 lasted.

If they were to blow out on my next trip, I woudln't feel that they owed me anything.
There's an exception to every rule.

Also, you have to take into consideration that the ball bearings in your unit would be smaller than the ball bearings in a 31-spline (1.3" axle) so there can be more movement between the inner and outer race.
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Old March 1st, 2009, 12:54 PM   #16
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Quote:
Originally Posted by Monkeyevil View Post
Sweet, thanks for the info.
Quote:
Originally Posted by BigTony View Post
I got a bunch of parts from a 1/4 mile guy, and it looks like he gave me the wrong bearing ends. I'll call strange monday. thanks for the info.
Any time!
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