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Originally Posted by gln_mllr
When the supercharger went out, CJ Auto sent me one that I put on. It was for the wrong model and I had to change it again. The one that I put on the first time wouldnt even register a quarter of the boost. This one does better but like I said it still isnt the same that it used to be. I have the number of the guy so I should call him again. Is there anyway to tell if its the right one so I might get around changing it again.
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From the outside probably not. From internally you could check the drive gearing and rotors/impellors. The original GM part number was 12371986 but that doesn't mean anything for parts made by other companies for GM like Eaton. Did you resuse your original pulley or did the replacement come with one. Measure it to see if it is 3.8". Other than that you might consider contacting CJ Auto and explain the situation of the low boost not being right.