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May I ask how much this modification cost? Parts and install if done in a shop? Did Just Diffs send you a complete third member and gear assembly? I’ve done a third member on the FJ before, that was fairly plug and play (if you have some knowledge/ a buddy who knows what they’re doing).
You’ve piqued my interest. I’ve been thinking the truck felt a little sluggish since the 295’s went on.
The gears are sold as a kit from @justdifferentials for $1400. They do not sell complete third members, I don't believe. I would highly recommend sending your thirds to Zuk with @gearinstalls.com. It's worth the cost in shipping to have your gears setup right. Ken charges around $350 I believe for each 3rd, extra if adding an electronic (Harrop) or air(ARB) air locker. Your shop charges to remove and reinstall the completed thirds will vary, but I'd suspect an additional $5-700. So all in around $2,800 I'd say is a good estimate, excluding lockers. I can't give you an exact price comparison from my install as I had my rear rebuilt, front added, and other work done at the shop at the same time. Oh, and don't forget that oil change again after 500 miles (I used conventional oil for the break-in and switched to full synthetic).