Depends on intended usage i guess. I pulled the 3 speed out of mine and am using a th400/dana 20 from a j truck. Ive built mine for 95% trail use and prefer the auto on the trail. If i were running say. 50/50 street and trail id try to find a t176 or t177 4 speed because of the decent first gear and i prefer the manual out on the road. For mainly road use id probably swap in an ax15 to take advantage of the overdrive. A t5 was offered as a factory transmission, and has overdrive but can be on the weak side
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