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Slip differential, new or pre-owned?


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I am contemplating the acquisition of a limited-slip differential and need your advice: Should I purchase a pre-owned unit or go for a new one?
A pre-owned item is likely to be somewhat worn and maybe less expensive. Require a reconstruction?

A new unit will be acquired, requiring startup costs but no reconstruction. I am capable of doing all the necessary labor to install the physical device, plus I know an individual who can provide shimming services for a fee.

I own a 323i Touring, equipped with a late ZF transmission (presumably) and a medium case (again, presumably), with a 2.93 gear ratio to the best of my knowledge.
I am also contemplating a little increase in ratio. Thus, whether new or pre-owned. I presently have around $1,000 in my budget.
Thank you, everyone.

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I will examine the birds soon. There are less costly torsion or helical differentials that I presume would suffice for my requirements compared to a pricier clutch type. I have also seen several little packages that can be accommodated inside a standard differential. I am now contemplating one of those options; however, more investigation is necessary since it seems quite subpar.

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The component you secure in a typical differential is subpar.

Examine Blackline; their products are of high quality and reasonably priced. I have installed several units.

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