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  Converting from 28 to 31 spline axle

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Author Topic:   Converting from 28 to 31 spline axle
Red_69Mach1
Journeyman

Posts: 28
From: Northridge, CA
Registered: Jan 2002

posted 04-04-2002 01:46 AM     Click Here to See the Profile for Red_69Mach1   Click Here to Email Red_69Mach1     Edit/Delete Message   Reply w/Quote
Hi guys-

I was wondering how you go about converting from a 28 to 31 spline axle for a Ford 9 inch rear end. Also, where would you buy the axles for the conversion? Thanks in advance.


--Al

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V8 Thumper
Gearhead

Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001

posted 04-04-2002 07:16 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
Hey Red... unfortunately it's not quite that easy. Unless you already have 31 spline carrier to go along with the 31 spline axles, in which case I'm just talking out my arse

Moser builds a mean set of axles, any lentgh, any lug pattern, you name it. I'm concidering Currie (they're local) but if they don't start answering my emails then I'll be calling Moser too

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Ryan Wilke
Gearhead

Posts: 2494
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 04-04-2002 08:50 AM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
You might want to check the prices & availability of the Mark Williams "MasterLine" axles.

Yeah, the differential will need to be changed from a 28 to a 31 spline.... This presents you with a good time to review what style of 31-spline differential you want: a locker, limited slip, mini-spool, or full spool (I'd suggest for a racer - a spool; for a street car - a limited slip). It's also a great time to freshen the bearings and even change out those ring/pinion gears to that ratio that you always wanted anyway...

Don't forget that the larger dia. 31 spline axles will require the larger axle seals.

It's not a cheap switch (what is?), but is it worth - you bet! Good Luck!!

Just my 1.5 cents,,,, Ryan

------------------
The '3-Pedal Attitude' Kid
in a '69 FB w/ 306 now, but
the 460+ is coming... :D

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Ron
Gearhead

Posts: 137
From: Newcastle, Wa.
Registered: Feb 2002

posted 04-04-2002 09:02 AM     Click Here to See the Profile for Ron     Edit/Delete Message   Reply w/Quote
spend the extra cash and get 35 spline

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2BAD6568s
Gearhead

Posts: 136
From: South Point, Ohio, USA
Registered: Feb 2002

posted 04-04-2002 09:16 AM     Click Here to See the Profile for 2BAD6568s   Click Here to Email 2BAD6568s     Edit/Delete Message   Reply w/Quote
I just bought a set of moser 31 spline for my 68 coupe. they are a great looking axle and with bearings and studs they only cost me $300. you should never break them in a street car. my uncle ran a 700 hp 460 in a thunderbird with 31 spline mosers so i have faith in them.

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 04-04-2002 02:06 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
If your car has small housing ends, there will be no room for a seal with the larger diameter 31 spline shaft. For this application, they use an 'O' ring bearing to seal the oil. I've had a set of these 31 spline Mosers in my car for several years now, and have not been able to twist one yet.

However, 28 spline axles and slicks will not last together forever. It pays in the long run to go ahead and upgrade to the bigger units if slicks and hard launches are part of the plan. (especially if you launch WFO with a stick shift and/or use the bottle taking off)

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

[This message has been edited by n2oMike (edited 04-04-2002).]

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Ron
Gearhead

Posts: 137
From: Newcastle, Wa.
Registered: Feb 2002

posted 04-04-2002 04:44 PM     Click Here to See the Profile for Ron     Edit/Delete Message   Reply w/Quote
why if you're gonna change all that out don't you just go to a 35 spline???

You're only talkin another $100-200

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 04-04-2002 05:25 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Ron:
why if you're gonna change all that out don't you just go to a 35 spline???

You're only talkin another $100-200


To go 35 spline, I believe larger housing ends need to be installed. There's also not much of a selection in differentials (outside a full spool) if much street driving is planned.

31 spline axles are more than enough for the vast majority of hotrods out there... But, if I ever get around to putting serious rubber under the mustang, and/or make any great strides in power production (408 stroker swap), the larger axles might become a necessity.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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chips67
Gearhead

Posts: 663
From: louisville, ky, usa
Registered: Jul 2001

posted 04-04-2002 07:12 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
i just bought everything to have my 9 inch switched from 28 spline trac-loc to 31 spline detroit locker with moser axles on a small diameter housing end. i bought the detroit and my friend set it up...total cost there was $475. the moser axle with bearings and stuff were $400 even. $875, thats how much it cost. my 28 spline left axle was way twisted and my trac-loc was almost a full peg-leg. mike, should i remove my old axle housing end seals? do the o-ring seals on the mosers seal well?

------------------
67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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Dave_C
Gearhead

Posts: 1069
From: Gadsden, Al
Registered: Aug 99

posted 04-04-2002 07:52 PM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by chips67:
should i remove my old axle housing end seals? do the o-ring seals on the mosers seal well?

I have 33 spline Moser axles in my car, along with the O-ring bearings. You need to remove the original axle seal in your housing. It has an inside diameter to match the 28 spline axles. The 31 spline seal is larger.

The Moser O-rings seal fine. Just be careful when you install the axles. I nicked one of mine on the brake backing plate when I was installing them. It caused just a little seepage. Just enough to make the backing plate messy. A few months later I pulled the axle and found the cut on the o-ring. It wasn't cut all the way though, so I put some silicone on it and made sure that the nicked spot was installed at the 12 o'clock position for good measure. No leaks since.

Later,

David Cole

[This message has been edited by Dave_C (edited 04-04-2002).]

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Rustang
Gearhead

Posts: 821
From: Clarion PA
Registered: Nov 2000

posted 04-04-2002 09:14 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
I went with Strange SS Street axles, which are comparable in price and performance to the Moser axle. I got 31 spline, but only because I already had the 31 spline spool. I could have went with the 35 (might have been 33?)spline at no additional cost plus a warranty.

They do not warranty the 31 spline. I think Moser had the same policy.

------------------
'68 mustang 351 clevor- [email protected]
'67 Stang, 351W [email protected]
'69 351C [email protected]
'78 Pickup [email protected]
'79 Pickup 460 ET=??

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