Ok I will try to direct u some but there are many experts on here that can rattle info off top of there heads more precise facts. 1st clarify what jeep u have. 92 yj? Or xj. I believe the 2.5l often had the ax5. But u can check Novak they generally got some good info 2 nd what are u intentions ? Daily, rocks mud all the above? What is the sbc u are using ? Carb, tpi, ls1? Are u changing ur rear end ? Do u like clutch or auto? And finally what is ur budget?
A stock 80's 350 puts out low hp moderate toque 260ish hp and 280ish ft I lbs torque.
A 2012 ls3 can easily get 500 go 450 ft lbs torque.
1st combo probably ok for a dana 35 rear ax 15 combo on 31's mild offroad. 2nd motor not so good.
Also tire and gear size are factors. I've seen 2.5l snap dana 35 axles with 35 " tires. Doing mild climbing.
Simply put. When u increase the torque in a drive train regardless if it is a 350 or a a cummins. U have to match the components behind it adequately.
I run a tpi 305 from a z28 with a sm420 tranny from a early Chevy trk into a dana18 transfer with a dana 44 rear. And I wish my rear was a 60 or a 9 inch ford. I don't daily drive it.
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