Are you kidding?
The D-30 will Hold up fine to the weight, torque , and hp , that the PO is talking about.
It was designed into it.
Unlike the Yota , the cj was delivered with a v8 .
In a Zuke with a 5.0 (305) and 33s , you will be on the low side of the design parameters of the stock 74 CJ5 5.0 (304) - 29s..
The D-30 is a much maligned (undeserving so ) axle. Millions were produced and millions are still on the road .
In rigs with much higher requirements than the PO requires.
The list is long and venerable. CJ's, Wagoneers, Some with the legendairy 401 monster behind them.
Mine...
The Scout. Bronco, Jeep J-Trucks, ETC .ETC. ETC.
Due to this reason allone . Parts are readily available for this axle.
And the 44
? Can you say VIPER v10?
? Vett. Jeep, Ford, Chevy, Isuzu, Cornbinder, ETC. ETC.
While the Toyota is a good axle . Especially the early FJ s. It is a much more costly conversion. And doesn't have the track record of the Dana units....JMHO....Boxcar...