31 spline pinion gear..

galveston · 12-15-2004, 11:16 PM

I need some help. I have a stock 87 GT and have purchased a 3.73 ring and pinion set. The spline count on the end of the pinion gear is 31. I can't seem to get a good answer if that will work on my stock rearend without changing the flange. I understand that the stock flange is 28 spline. Is that correct? Thanks.

Jeff Chambers · 12-16-2004, 07:29 AM

Don't confuse the companion flange spline count with the actual axle spline count. You'll be OK.

~The Jester~ · 12-16-2004, 07:46 AM

Right, what Jeff said. The 31 splines you're talking about are on the pinion gear itself. The 28 splines you're talking about are on the AXLES, and have nothing to do with your gear swap. You're OK.

12-15-2004, 11:16 PM	#1
galveston Registered Member Join Date: Aug 2004 Location: Bend Oregon Posts: 22	31 spline pinion gear.. I need some help. I have a stock 87 GT and have purchased a 3.73 ring and pinion set. The spline count on the end of the pinion gear is 31. I can't seem to get a good answer if that will work on my stock rearend without changing the flange. I understand that the stock flange is 28 spline. Is that correct? Thanks.

12-16-2004, 07:29 AM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: 31 spline pinion gear.. Don't confuse the companion flange spline count with the actual axle spline count. You'll be OK. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

12-16-2004, 07:46 AM	#3
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: 31 spline pinion gear.. Right, what Jeff said. The 31 splines you're talking about are on the pinion gear itself. The 28 splines you're talking about are on the AXLES, and have nothing to do with your gear swap. You're OK. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

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