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fatlip Sep 18th, 01, 6:05 PM Hello fellow chevelle car folks,I am looking at a 331 non posi out of a el-comenio,it is heavy duty, 8.5,can this be changed to a posi unit,and is it worth the money to do wants 175.00,thanks to all,Rick drptop70ss Sep 18th, 01, 6:18 PM It can be done, but I wouldnt pay more than $75 for a 10 bolt open rear, $175 seems steep. ------------------ Dave 70 chevelle ss396 conv 66 chevelle ss396 hdp/conv 72 chevelle TC member #493 Never forget Earnhardt! howell Sep 18th, 01, 9:28 PM Look at it this way. $500 will get you a 12-bolt posi in the mid-west easily. Less money than that, you my have a fair deal. More than that, don't do it. ------------------ 1970 Chevelle Convertible (http://www.chevelles.com/showroom/howell.jpg) big gear head Sep 18th, 01, 9:42 PM A Eaton posi will cost you about $350 new or around $200-$250 used. There is some shimming to do when changing it. You didn't say what year Chevelle you have, but be sure the 8.5 will fit it first. fatlip Sep 19th, 01, 2:07 PM <BLOCKQUOTE>quote:</font><HR>Originally posted by big gear head: A Eaton posi will cost you about $350 new or around $200-$250 used. There is some shimming to do when changing it. You didn't say what year Chevelle you have, but be sure the 8.5 will fit it first.<HR></BLOCKQUOTE> the chevelle is a 71,sport coupe,350-350-mild cam ,headers,has a 256,10 bolt now,non posi big gear head Sep 19th, 01, 4:53 PM I'm not sure, but I've read here before that the 8.5 from '73 and later will not fit in the '72 and older cars. drptop70ss Sep 19th, 01, 5:13 PM a 71 with its original rear should have a 8.2 10 bolt, and the 8.5 center will not fit. ------------------ Dave 70 chevelle ss396 conv 66 chevelle ss396 hdp/conv 72 chevelle TC member #493 Never forget Earnhardt! big gear head Sep 20th, 01, 7:53 PM But will the complete 8.5 fit the '71 Chevelle? I've been told it won't. drptop70ss Sep 20th, 01, 9:08 PM yep,if you can find a complete 8.5 rear from a chevelle or elcamino it will bolt in. They are not too common to find, since they are a one year only deal with the housing that fits(1972). The 73 up rears will not fit. ------------------ Dave 70 chevelle ss396 conv 66 chevelle ss396 hdp/conv 72 chevelle TC member #493 Never forget Earnhardt! DZAUTO Sep 21st, 01, 8:54 AM BE ADVISED, this is a repeat. The 73-later rear axle housings will not bolt into a 72-earlier chassis. I totally realize how frustrating it can be when trying to find just what you are looking for. But be patient, it WILL eventually show up, just keep looking. A couple of years ago, I ran across a 69 in a salvage yard with a 3.07 12bolt posi for $100. I tore it down cleaned it up and 5 of the 6 bearings needed to be replaced for about $90. A few months ago, I ran across a 70 Elky with a 2.73 non-posi 12bolt for $75. With a posi unit installed, this will make an excellent cruising/hiway rear for a BB car, because a BB will have plenty of torque to turn it. I put the 3.07 in my 70 conv with a SB400/M-20 and it is a Perfect combo, especially on the interstate. ------------------ Tom Parsons fatlip Sep 21st, 01, 3:33 PM Hey,thanks to all of my chevelle friends here,alot of good opinions,i think i will wait for that right rear,it will come soner, or later,thanks again,rick | ||