9 inch axle swap
- Thread starter JP0814GT
- Start date
Yes, im quoting myself. I just sheared off about 20 teeth of the ring gear on my rear. My car makes 630whp, 3800 race weight, rxt clutch, on a 4600rpm two step. Makes me think a 9" would have been the better solution.
That sucks! Your leaving pretty hard! I'm going with 3.25 ratio on the 9" with the iron case for strength. And doing the back brace mines auto trans but I'm adding a trans brake when they do the rear so rather be safe than sorry..
The m9 looks awesome under the car. It's a shame no one will ever see it.
we just got done snapping moser 35 splines last weekend in Maryland on the 8.8
we are a dealer for moser and strange and opted for doing a strange 9" direct bolt in, 1/8" shorter on each side.
the strange setup is about 25lbs over the weight of the 8.8 and is about a 3% loss on the standard package over an 8.8. we are doing a couple upgrades that we offer which should get the power closer to a 1% loss.
we are also doing 40 spline axles,
we are a dealer for moser and strange and opted for doing a strange 9" direct bolt in, 1/8" shorter on each side.
the strange setup is about 25lbs over the weight of the 8.8 and is about a 3% loss on the standard package over an 8.8. we are doing a couple upgrades that we offer which should get the power closer to a 1% loss.
we are also doing 40 spline axles,
yeah, losing races, lol
The 9" 35 splines are beefy, compared to 8.8 or something like a 12bolt.
Yep 35 spline is bad ass one thing most people should know is 35 spline is also the largest spline option that you can choose nearly any diff limited slip, locker or spool. 40 spline is SPOOL ONLY and if you end up hating the spool you'll have to swap back to 35 spline every thing including diff and bearings to change it. Most people especially street strip combo probably aren't going to break a 35 spline. 9 inch is what most of the faster cars run regardless. Setup right 9 inch is king...
The truth is it all subject to break on a prepped drag strip if you continue to push power and launch rpm level up up up..
The truth is it all subject to break on a prepped drag strip if you continue to push power and launch rpm level up up up..
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35 spline 9" is the King street / Strip high HP option period if you consider you can have the flexibility to do nearly any differential you like period and it will take a shit load of power to boot..
Cobra Jets run 9" with 35 spline axles..
Drag only 40 spline is stronger.
Cobra Jets run 9" with 35 spline axles..
Drag only 40 spline is stronger.
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Some others may know that answer. My center section was pre assembled by Moser so they installed the gears bearings and every thing so its simple bolt in axles and center section in housing. I would assume if the center section is setup correctly there wouldn't be any additional whine.
Same as if a 8.8 isn't setup right I had that happen by a local shop on my 08 GT and it whined till it burned the pinion bearing up they had it shimed to tight loading the bearing up and it failed. Had to rebuild again..
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9" differential power loss
If there were any appreciable ET difference between the 9" style differential and anything else, all the late model NHRA Stockers ie... Cobra Jet, Dragpak, and COPO would be running a different rear end, they all run 9" style rear ends these cars are loaded with every trick imaginable to squeeze all the ET that possible.
If there were any appreciable ET difference between the 9" style differential and anything else, all the late model NHRA Stockers ie... Cobra Jet, Dragpak, and COPO would be running a different rear end, they all run 9" style rear ends these cars are loaded with every trick imaginable to squeeze all the ET that possible.
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