Thanks for the info here fellas, I've only owned Jeeps for a year now and becoming a huge fan the more I drive them. I bought a 91 XJ Limited and it has the tranny toggle switch. It was in comfort mode when I bought it so I left it there and didn't think about it again. The first time I had it on the interstate, I could barely merge off the on ramp with speed, and I figured it was built for low speed high torque. Recently though, I decided to see what the transmission button actually did, so I knocked it in to power mode and immediately noticed the difference.

Before, it was sluggish and had hardly any throttle response. It did exactly as described above and shifted gears early and tried to keep itself in the same gear for as long as it could. I drive it easy since it was well taken care of and drove easy by the previous two, late 60s owners. It's totally stock as well. I keep track of my fuel consumption every fill-up and it also helps me tell when I'm having an issue (by drinking more gas suddenly). I get 17-18 mpgs when everything is running great... in comfort mode. I'm testing now to see if it does better in power mode, and after reading this thread I'm definitely curious. Seems like bogging down the motor isn't a good thing, no matter how comfortable it is! I ended up liking the Jeep so good I bought another, except this one is a 92 Cherokee Briarwood with wood laminate down the sides like an old wagoneer would have, and it too has the transmission switch. It's also 100% stock. So I guess they carried into 92 as well

 

only problem with your theory is yes my renix 90 is non HO and has it..but my buddies 91 xj HO has it and my 91 mj HO has it...all with aw4's

 

You seem to know alot about Jeeps. Can i swap to a power comfort transmission if my original transmission didnt have it to begin with?

 

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