The only other gears available for the Eaton HO52/72 is 4.11's. The only to obtain those is to find a good used 3rd member, and those are getting very difficult to find. Parts in general for those are getting harder to find and often times expensive. If this were my truck, I would change the differential for either a Dana 60 or a 10.5" 14 bolt. The other option would be to change the TH400 for a 700R4, 4L60E or a 4L80E. The differential would be the cheaper option. If you could find a Dana 60 from a '68-'72 big block C20, it would be a direct bolt in except for the panhard bar and if from an auto trans truck, it should have 3.54 gears. If you decide to go with a 14 bolt, I do make the trailing arm mounts for those. Here is a thread showing one member's conversion.
http://www.67-72chevytrucks.com/vboa...d.php?t=624445
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Originally Posted by f66
Just checked. Rear axle is JS (327 w/4:57) Will look for advice on best gears and trans options.
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