like what should i also get for the installation of the posi unit. becuz its a used but maintaned posi unit out of a 1989 formula with the 26 spline axles and its a carrier 2 or 2 carrier how ever it is , will this fit no problem and if it does what else should be dun when gettin it installed. another question where should i go to get this dun becuz i dont have the tools or knownlagement of how to put one in so im not screwin around with it. should i take it to the chevy deal and have them put it in or what any thing is helpful. later

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mods to car
new ignition system, edelbrock intake,600 cfm q-jet,th-350 tranny, used black interior, grant stering wheel, accel plugs and wires, hookercat back, b&m shifter, emmission delete package, computer delet package and soon ac delete and in future-- hooker sump comp headers, posi rear, drag slicks and all new rims probably weld rims, line lock, 8 point roll cage, strut tower brace, drag shocks, sfc, new edelbroc 600 carb, nitrous and a weiand supercharger or a 350 or 400 block

 

take it to dealer would be a good idea. if all you're doing is changing carriers there isn't much i'd do, maybe new ring gear bolts.i'd use only gm posi additive and synthetic oil.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

If you're gonna beat on it, it would be a good idea to replace the crush sleeve with a solid pinion spacer.These are available from Eaton as well as others.An aluminum support cover helps too,Summit has a few different versions available, including their own, for about $135.Many also recommend welding the axle tubes to the housing (all the way around),though, this may be overkill for your application.Other than that,if the bearings and seals are good (complete kit about $100),just a good Synthetic Gear Oil (Redline,Richmond,Etc)I'm using Redline (I think 85W145),and replace the oil after 500 miles of break-in.
-Rich-