Don't think I am stupid guys , I don't know all that much about gears or axles, but I was wondering what the difference was in the spline number.
thanks
Mike

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Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber.

 

It is the number of splines, or teeth, on the axles where they meet up with the gearset. That's as simple as I can put it. The 28s are a little stronger than the 26s. They started putting the 28s into our cars in 1989 but weren't fully phased in until 1990.
bsa

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"If they do not run, Then they will die." - Stonewall Jackson
#3
'87 IROC, 355 TPI, Converted to SD, 700R4, B&M Megashifter, 3.42, Trick Flow Twisted Wedge Heads, Edelbrock Intake, Accel Runners, Comp Cam, Crane Gold rockers, Lucas 24# injectors, Edelbrock headers, Flowmaster 3'' exhaust, Mallory Ignition, Transgo Performance Shift Kit, Corvette Servo, 2,000 Stall Torque Converter

 

The more splines, the larger the axles. Larger axles can take more torque without twisting. The downside is that factory axles are tapered so they are still weak. If you upgrade to 28 spline then buy some aftermarket axles. They don't have the taper and are much stronger. Aftermarket axles will cost around $125 each.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 481.6
Best 60 foot: 1.546

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley