mackey58 Posted December 21, 2021 Share Posted December 21, 2021 I wanted the mechanic to put automatic slacks on the 90RD since hes doing the brakes .he said they won't fit cause theres a clearance issue. Any one hear of thay Quote Link to comment Share on other sites More sharing options...
storkmack Posted December 23, 2021 Share Posted December 23, 2021 We put them on everything. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted December 23, 2021 Share Posted December 23, 2021 yes... the rear axle wont allow 5 1/2" OC by 28 spline slacks to fit, unless you buy left side and right side... I just dealt with this on (2) '86 RW 713's.. The issue I found was that the S-cam was too short and the snap ring on the outside of the slack adjuster would not go on... so I was not able to shim it out... Jojo Quote Link to comment Share on other sites More sharing options...
mackey58 Posted December 23, 2021 Author Share Posted December 23, 2021 So I could have been done but you have to order left and right.they were pushing him to get it done. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted December 23, 2021 Share Posted December 23, 2021 yes, if your Mack Dealer will help you.. I do not have the part numbers, otherwise I would post them for you... The issue I found was that the S-cam was too short, coming out of the S-cam housing, and I was unable to shim the slack out to clear and get the outer snapring on.. jojo Quote Link to comment Share on other sites More sharing options...
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