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  How much power can 28 spline axles take?

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Author Topic:   How much power can 28 spline axles take?
68DARKHORSE
Gearhead

Posts: 445
From: Austin, Tx
Registered: Aug 2002

posted 12-04-2002 11:59 PM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
I have a 9" 3.89:1 geared Detroit No Spin(locker).
Not sure if I need to start over.

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Alton

68 GT FASTBACK J code

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01 GT BULLITT

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96 OJ BRONCO

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 12-05-2002 07:46 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
There were two different 28 spline axles. The small one might not be able to handle the car with slicks. The larger axle is very similar to the 31 spline axle but with 28 splines. It may be able to handle fair amount of power without twisting the axle even with slicks.

Moser has an axle spline calculator on their website that might give you a clue as to what you have will be okay or if you need to start over. I have always felt that 31 spline was the minimum starting point for any hot street/strip car. With that said, there are many who have run the 28 spline axles with no problems.

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n2oMike
Gearhead

Posts: 2680
From: Spencer, WV
Registered: Jan 2001

posted 12-05-2002 09:28 AM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
As long as you aren't launching WFO on slicks with a stickshift, or launching on the bottle with an automatic... you'll be fine.

Good Luck!

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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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68DARKHORSE
Gearhead

Posts: 445
From: Austin, Tx
Registered: Aug 2002

posted 12-05-2002 11:45 AM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
Thanks guys.
Here is the link to the calculator.

http://www.moserengineering.com/moser_interior/axletech.htm

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bluestreek
Gearhead

Posts: 1724
From: Athens,GA
Registered: Jul 2001

posted 12-05-2002 11:54 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
350 ft/lbs of engine torque without any loss of traction would probably be about the limit.
They can take a lot of twist before actually damaging the splines, as long as the tires are allowed to slip under a heavy pull.
I ran the 28 spline axles coupled with a mini-spool and BFG drag radials for a year in a 9" from a '67 Stang. When turning sharp on the pavement, I could feel the whole axle twist just before the tires would hop. I Just pulled the 4.44 geared spooled center section out to put the Trac-Loc back in and the axles looked fine with no apparent wear or spline twist.

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1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, ported TFS alum. heads, ported Stealth 8020 intake, CompCams Xtreme Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi, BFG Drag radials..

[This message has been edited by bluestreek (edited 12-05-2002).]

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BlueMule
Gearhead

Posts: 1547
From: Kent Island, MD USA M&M # 2423
Registered: Sep 2002

posted 12-05-2002 12:16 PM     Click Here to See the Profile for BlueMule   Click Here to Email BlueMule     Edit/Delete Message   Reply w/Quote
Does the tag give any clue as to the number of splines you have?

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-Paul

70 Mach1
79 Ranchero GT
97 Expedition XLT
00 SVT f150 Lightning 4149 of 4966 Born on: 06/26/2000

'life's tough... it's tougher if you're stupid.'

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stang106
Gearhead

Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001

posted 12-05-2002 12:44 PM     Click Here to See the Profile for stang106   Click Here to Email stang106     Edit/Delete Message   Reply w/Quote
It seems to me (and I'm no authority) that the 31 spline axles had solid ends at the studs and the 28 spline axles had an indent about one inch deep.
Dave

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Rustang
Gearhead

Posts: 805
From: Clarion PA
Registered: Nov 2000

posted 12-05-2002 01:05 PM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
I've went low 11's with 28 spline axles in a 3100# car with C-4. Made alot of passes and no problems. Of course, stick-shift would be a whole different ballgame!

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

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68DARKHORSE
Gearhead

Posts: 445
From: Austin, Tx
Registered: Aug 2002

posted 12-05-2002 05:18 PM     Click Here to See the Profile for 68DARKHORSE   Click Here to Email 68DARKHORSE     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Rustang:
I've went low 11's with 28 spline axles in a 3100# car with C-4. Made alot of passes and no problems.

That's what I wanted to hear.

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steve'66
Gearhead

Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000

posted 12-05-2002 10:39 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
We ran 12's with stock 28 spline axles from a '57 Ford rear before we twisted them up. Now we're running 10's with 28 splined Moser axles. Run them 'til the twist

SteveW

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