NF are much more rigid than a WF. years ago we spent time measuring twist of the frames to see how much you could go before driveline binding started. . I've done the removable tunnel before then just bolt it on. now to the rearend, take it out. you aren't going to fix much once you torch to remove the shifter . you can look and maybe see whats wrong. but in most case's to repair it has to come out anyway
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