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Differential rebuild; any "while you're at it..." useful suggestions?

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Grinding and a leak = rear end rebuild.  Thought I'd ask if there are any "While you're at it, it would be good to do..." suggestions.  Already have checking the u-joints once the diff is opened up and axle seals.  What else?

Also, currently have 3.25 gears (351C-4V, C6) which means about 2600 rpm at 55 mph; my guy says won't even feel 3.00 gears but will reduce rpm and improve mileage.  Your thoughts?

Edited by RC92234
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I replaced my 3.25 open with a 3.50 trac loc.  I felt the 351 4v with c6 and stock converter was a dog off the line.  3.50s did liven it up a bit. Definitely replace u joints while the drive shaft is out.  New axle bearings, too.

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Rick Bombard

1971 Grabber Green Mach 1 351C 4V

2013 Race Red California Special Convertible

1973 Medium Copper Metallic Convertible 302 4V     SOLD

1953 F-100 SOLD

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I’d do axle bearings while you are at it.  Maybe the brakes?  Send the driveshaft out to have the balance checked post u-joint replacement?  If you pull the housing use new u-bolts.

Chromoly axles?  31 spline axles and carrier?  Save some weight with an aluminum 3rd member?  Nodular iron 3rd member for strength?  Maybe a torque biasing or limited slip differential?  If you hate yourself how about a Detroit locker?  Maybe upgrade to 1350 size yoke?  How about a new driveshaft to pair with that larger yoke, maybe carbon fiber or aluminum?  How are your rear springs / shocks?  Maybe some sort of traction bar?  Coilover system?

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