So then... you have three styles to choose from, and then you have specific options for each diff as well.
Styles:- Viscous Type (OEM Crap)
- Torsen Type (Gear Driven)
- Clutch Type (Bind under tight turns)
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Once you've chosen your desired type of Rear Diff (obvioiusly not the OEM viscous type), you must then choose how much lock-up you want across the axle.
Torsen types are fixed
Clutch type diff are adjustable
- 1-way (accel only)
- 1.5-way
- 2-way (accel and braking)
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Once you've decided THAT... you can then ask us which vendor and model seems most approriate for your needs.
Consequently, do you do track days or have other mods?
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Personally, i like the Torsen / Quaife diff. Requires no maintenance and doesn't bind under tight turns, or chatter.
But that's just my opinion, i could be wrong.