For 35" tires, which is as big as the TJ's Dana 30 and Dana 44 are able to handle long-term, stick with a good quality hardened chromoly alloy 30 spline axle shaft like one from Revolution Gear & Axle (the only USA made axle shafts for the TJ). The probability of breaking a good quality hardened alloy 30 spline shaft with lockers and 35's on even a very tough trail are pretty much nil.

I've been running that combination for 13-14 years and it's been bulletproof on even some very tough rock crawling trails. I have twisted the OE carbon steel 30 spline factory rear shafts and broken a front Dana 30 shaft on 35's while rock crawling but no problems since switching both axles to hardened alloy shafts many years ago.

This is what I recommend and have been running... https://www.4lowparts.com/shop/axles-and-gears/dana-44-rear-axle-kit-jeep-tj-xj/

Not to mention by running 35 spline shafts on a TJ you run the risk of breaking something further up the drivetrain that could be absolutely catastrophic and not repairable on the trail.

 

G2 Axle and Gear - Dana 44 YJ/XJ/TJ 30 Spline Rear Chromoly Axle Kit Disc - Fits 1987 to 2006 Wrangler,Rubicon and XJ Cherokee - 4WD.com

The price doesn't scare me away on your suggestion. I just wonder why these are 200 bucks cheaper when they are supposed to be the same thing?

 

G2's are not the same thing, they are ProComp's house brand made for them by Genuine Gear and are imported from someplace like India or China. That said, G2 seems to be decent but personally, I'd rather have the American made RGA axle shafts.

Whatever axle shaft brand you choose, make darned sure to tell them whether you have drum or disk brakes in the rear. That way you'll get the correct axle shaft retainer plate. At least it will if you order the RGA kit from 4Low Parts, they're aware of that difference.