I have 26 splines and was wanteing to get posi and gears, but Im not sure if its worth it to switch over to 28 spline or not. How much stronger are tehy?

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89 camaro 305 tbi, flomaster 3 chamber cat back, gutted cat, Edlebrock TES Headers, Exhaust cutout, Edlebrock open element, 160 degree T-stat, and a Stage 2 FastChip.

2 kicker comp 12"'s, polk for the rest. Phoenix gold xs2300 to subs, kicker impulse 404XI to 4 speakers, pioneer DEH- P7000R head unit, and finally a 12 disc changer. Full leather interior from http://www.MrMikes.com

 

I doubt you would hurt them with your current setup.

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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

 

Put slicks on and you'd be suprised how little power you need to break things. It's all about tolerances and design. Stock rear and small axles were not designed to handle the abuse of super traction and a powerful engine. Kind of why 10bolt is the most popular .
If you don't plan on drag w/slicks then I wouldn't worry about the axles yet. Think about the tranny and if you want a happy buttdyno, get some 3.73 gears and a posi.

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, Jon (350 TBI!)
91 Red My website

 

Probably break the ring and pinion before an axle would snap.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkim bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, current red metallic paint. Lots of other stuff...
82camaro

 

That's more of what I was thinking. I run aftermarket 28 spline axles in mine. I expect to break the gears before I break the axles.

 

Naw. The spider gears in a stock carrier are usually first, followed by the axle splines, then the bearing cap, then ring&pinion...

Order of weakness is subjective and learned more than once through uncontrolled testing...

 

My stock 26 spline axles have more than 100 passes in the 12.50-12.70 range and about 12 more (recently) in the 11.60-11.80 range. it has Richmond Gears and an Auburn minispool, all else is stock. The car pulled consistant 1.74-1.76 60' with the old emgine and is pulling 1.62-1.64 with the new 383. It may break next weekend, but it has been a good rearend despite the fact that they have a terrible reputation. Car-Pro Motorsports has even built several 10 sec cars with 7.5 rearends but I think most of those had 28 spline axles.

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82 Z28 383, Ported 215cc Dart Iron Eagle Heads 72 cc Comb. Chambers, Comp custom grind Hyd roller cam, Speed Pro .250" domes, Wheeler Motorsports 4340 I beam rods, Eagle 5140 steel crank, Weiand Team G intake, Holley 830 DP, hedman headers
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET:11.63 @ 113.25, w/ a 7.39 1/8 @ 93.04, and a 1.626 60'


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 14.91 @92.9
Bassett Racing

[This message has been edited by Basett_Racing (edited June 14, 2001).]