The Impala rear is a good idea, if you can find one local. If you have to ship it in, it's cheaper to buy a new housing. You can buy a new housing from Moser for around $650 in any width you want, with the billet housing ends already welded on.
The Impala rear has brackets on it that will need to be cut off and ground smooth, then it needs to be hot tanked or blasted, then you need new housing ends because the Impala uses large truck style housing ends. After helping someone else prep an Impala rear to be narrowed (a full day's project), that $650 to Moser seemed like a good deal.
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