28/31 spline??

galveston · 12-05-2004, 09:02 PM

I have a question...does my stock 87 GT come with a 28 spline ring & pinion? I just purchased a ring and pinion set on ebay and was told it was a 28 spline but turns out it's a 31. Can I get this to work and with what changes? Thanks.....

BowTie Eater 5 Liter · 12-05-2004, 10:32 PM

mustang/ranger(4.0l) runs a 28 spline, explorer runs a 31 as well as fullsize pickups.

the "ring and pinion" should not be affected, as they are just bolted to the carrier, so im guessing you got the carrier as well?? if thats the case, just swap the ring gear over to your carrier, as far as i know, with the r&p it doesnt matter what spline your axleshafts are

blue00gt · 12-06-2004, 03:05 PM

You can also get 31-spline axles that would work with the 31-spline carrier if you were planning to upgrade for strength.

galveston · 12-07-2004, 07:45 PM

Thanks for your help.

galveston · 12-13-2004, 03:38 PM

Thanks for your help.So if I understand it, I do need to change my flange to a 31 spline and everything else is OK? Thanks..

~The Jester~ · 12-17-2004, 09:43 AM

If your counting the splines on the pinion gear itself, you should be fine. Those splines are what the driveshaft yolk slip on to.

Now if you bought the whole carrier, and you're counting the splines on the side gears, this is where the axles spline count comes into play. Your Stang came with 28 spline axles, not 31. Not a big deal, many options here. Like was mentioned before, simply swap the new ring gear onto your carrier, and presto. Or, Strange, Mosier, and a few others make 31 spline axles that slide right in. They're stronger than stock, and almost bulletproof. Good time to upgrade if this is the problem you're having.

galveston · 12-17-2004, 01:21 PM

Thanks for your help. I didn't think it would be a problem but just needed some clarification on that. Thanks again.

12-05-2004, 09:02 PM	#1
galveston Registered Member Join Date: Aug 2004 Location: Bend Oregon Posts: 22	28/31 spline?? I have a question...does my stock 87 GT come with a 28 spline ring & pinion? I just purchased a ring and pinion set on ebay and was told it was a 28 spline but turns out it's a 31. Can I get this to work and with what changes? Thanks.....

12-05-2004, 10:32 PM	#2
BowTie Eater 5 Liter Registered Member Join Date: Nov 2000 Location: Maple Ridge B.C. Canada, The Best Place In The World Posts: 871	Re: 28/31 spline?? mustang/ranger(4.0l) runs a 28 spline, explorer runs a 31 as well as fullsize pickups. the "ring and pinion" should not be affected, as they are just bolted to the carrier, so im guessing you got the carrier as well?? if thats the case, just swap the ring gear over to your carrier, as far as i know, with the r&p it doesnt matter what spline your axleshafts are __________________ 1984 Bronco II, 36" Michelin Military Tires, 95 EFI 5.0, NP435 Tranny, NP208 Doubler, NP205 Transfer Case, Fill Size Solid Dana 44 Front End, WH Progressive Rate Rock Crawling Coils, Bronco 8.8 Rear, Skyjacker Softride Leafs, 5.13 Gears, Detroit Locker. Final Crawl Ratio Of 175:1 88 GT Best 60ft. 2.181 Best ET 14.350 Best MPH 98.01 ~WRECKED!!!!~

12-06-2004, 03:05 PM	#3
blue00gt Mustang Addict Join Date: Jan 2001 Location: McKinney, TX Posts: 1,294	Re: 28/31 spline?? You can also get 31-spline axles that would work with the 31-spline carrier if you were planning to upgrade for strength. __________________ Strike down the unroadworthy! 2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more '94 Rio Red Cobra: All the bolt-ons, 3.73s

12-07-2004, 07:45 PM	#4
galveston Registered Member Join Date: Aug 2004 Location: Bend Oregon Posts: 22	Re: 28/31 spline?? Thanks for your help.

12-13-2004, 03:38 PM	#5
galveston Registered Member Join Date: Aug 2004 Location: Bend Oregon Posts: 22	Re: 28/31 spline?? Thanks for your help.So if I understand it, I do need to change my flange to a 31 spline and everything else is OK? Thanks..

12-17-2004, 09:43 AM	#6
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: 28/31 spline?? If your counting the splines on the pinion gear itself, you should be fine. Those splines are what the driveshaft yolk slip on to. Now if you bought the whole carrier, and you're counting the splines on the side gears, this is where the axles spline count comes into play. Your Stang came with 28 spline axles, not 31. Not a big deal, many options here. Like was mentioned before, simply swap the new ring gear onto your carrier, and presto. Or, Strange, Mosier, and a few others make 31 spline axles that slide right in. They're stronger than stock, and almost bulletproof. Good time to upgrade if this is the problem you're having. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

12-17-2004, 01:21 PM	#7
galveston Registered Member Join Date: Aug 2004 Location: Bend Oregon Posts: 22	Re: 28/31 spline?? Thanks for your help. I didn't think it would be a problem but just needed some clarification on that. Thanks again.

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