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Do I need GM additive?93 LT1 07-07-2003, 07:47 PM Need to change the diff. fluid on my 3.4L V6. Went to the chevy dealer and the guy looked @ me like I was nuts because I asked for Limted Slip Additive. He said I do not think you need that on a V6? I bought it anyway. So, do the 3.23 Auto 3.4's have a POSI unit requiring this stuff???:confused: -------------------------- 93 LT1 93 3.4L MustangEater82 07-07-2003, 07:50 PM Stock no.... never an option availible for it as far as I know. V6Power 07-08-2003, 01:08 AM Only if you have an Auburn or Eaton posi. Something clutch based. ImportKILLER 07-08-2003, 11:46 AM Technically no, you don't need it. The Zexel-Torsen unit does not need the additive. BUT... When we changed the fluid in my friends car, it made a weird noise. When we added the additive for kicks, the noise went away. $5...won't hurt to add it in anyways. | ||