mack88 Posted 5 hours ago Share Posted 5 hours ago My R frame has gotten very thin under the fifth wheel,so want to replace both sides its a sleeper truck.Was looking at Mack body builders it shows the further ahead you go of front drive the downward weight increases,so i was thinking of replacing from the back to just ahead of front axel then put 4 foot inner sleave in,the frame is good otherwise just under the fifth wheel.Any thoughts/advice on this. Quote Link to comment https://www.bigmacktrucks.com/topic/76440-1987-r-frame/ Share on other sites More sharing options...
67RModel Posted 5 hours ago Share Posted 5 hours ago I assume you mean the front drive axle and not the actual front axle. Is the suspension camelback? Quote Link to comment https://www.bigmacktrucks.com/topic/76440-1987-r-frame/#findComment-591922 Share on other sites More sharing options...
mack88 Posted 4 hours ago Author Share Posted 4 hours ago sorry yes front drive axel and single frame and air ride Quote Link to comment https://www.bigmacktrucks.com/topic/76440-1987-r-frame/#findComment-591924 Share on other sites More sharing options...
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