04AZUREBLUEMACH1

Dumb question:

What's the difference between 28 and 31 splines and which ones do I want?

What did the Mach come with factory?

Thank you!

rygi23

There are no dumb questions, or I would've been banned from this forum long ago. 28 is stock, 31 is more durable and can handle more torque. Leaving them stock wouldn't necessarily mean immediate disaster. If you think you'll eventually do it then just do it while the rear is apart.

FELEN

im going to order my rear gears from buyfordracing.com just cuz thats the cheapest ive found them

rygi23

$150...damn.

03MachMe

thats where i bought mine. no problems either

03MachMe

he is right. but unless you think your going to be adding alot of power 28s are just fine. i just ordered some hardened 28s because i dont plan on adding really any more power till im out of school and that way i dont have to chage differentials. if you order 31s you have to get a new differential as well. my stock axles hold up to my 5k launches at the track with some MT ET streets and are just fine. but if you think your going to put spray or boost anytime soon 31s are prolly a good idea

04AZUREBLUEMACH1

I only drive on the street with street tires, and I never dump my clutch. I burn out from time to time, and I have 100k miles.

Would it be reasonable to leave my stock 28s alone?

dennis_112

Your stock axels are fine for the street.

03MachMe

yea stock is more than fine for that

Andy13186

even if you do break your 28 splines there are aftermarket mosler 28 splines that are stronger than stock

not sure if they are weaker or how much weaker they are than stock 31 splines