GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

9.25" front diff in half ton

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Old 10-18-2016 | 11:30 PM
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Originally Posted by Atomic
Is the case still aluminum? Don't know how I feel about a positive traction aid in an aluminum case...
I can sort of see where youre going with this, but in your opinion why would it be that much worse then when both front wheels have good sticky tires and traction?
Old 10-18-2016 | 11:56 PM
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When both tires have traction its basically the pinion gear turning the ring gear which the case has to absorb, but its not a shock load, and the majority of the energy is going out the axle shafts. Obviously when one of the tires looses traction all the force goes to the that tire (not really all as traction doesnt go to zero when something is spinning, but the friction coefficient goes way down). With a traction device, when a wheel starts to spin the traction device engages and tries to keep both locked together by leveraging against the case. In a true locker this would actually be easier than a posi or true trac type as there isnt any shock loading, but good luck turning with a true locker in the front.

Lot of works, but basically with high traction tires and no spinning you are more likely to break axle shafts. With a locker/posi you are more likely to break the case from shocking it when it tries to lock.
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Fahmi Al-Wadhahi (12-26-2020)
Old 10-19-2016 | 07:44 AM
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Old 9.25 were all aluminum I believe, new ones (2011+) are steel and aluminum. A lot beefier.


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Fahmi Al-Wadhahi (12-26-2020)
Old 10-19-2016 | 03:23 PM
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Damn that looks great... I wish i could just slide that bad boy in there...
Old 10-19-2016 | 09:50 PM
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Originally Posted by Atomic
When both tires have traction its basically the pinion gear turning the ring gear which the case has to absorb, but its not a shock load, and the majority of the energy is going out the axle shafts. Obviously when one of the tires looses traction all the force goes to the that tire (not really all as traction doesnt go to zero when something is spinning, but the friction coefficient goes way down). With a traction device, when a wheel starts to spin the traction device engages and tries to keep both locked together by leveraging against the case. In a true locker this would actually be easier than a posi or true trac type as there isnt any shock loading, but good luck turning with a true locker in the front.

Lot of works, but basically with high traction tires and no spinning you are more likely to break axle shafts. With a locker/posi you are more likely to break the case from shocking it when it tries to lock.
Got it so youre mainly worried about the shock loading on the case. I didnt really think a torsen style carrier would have that much of a shock but im betting your right as thats partially how it works, it needs a load difference to lock it up.
Oh well too late now, ive got a torsen style in the front diff of my project and its alum case. Have to see how it holds up

Also Vortec ive got my 8.25" out of my ss currently out at the moment if you need some measurements to compare to a 9.25". But i really dont see a reason to upgrade, just keep the fluid good and change the bearings every 50k and your good to 4digit HP unless youre at the track every weekend. Why over complicate things?
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Old 10-22-2016 | 07:08 PM
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The only GMT800 9.25 IFS swap thread I ever saw showed the guy had to modify the frame and the case still hit the steering center link. I think the he ended up having to modify the steering link or something. He said it was a lot of work.
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Old 10-23-2016 | 04:01 PM
  #17  
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how often are people breaking the 8.25s?
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