Power transmission switch?

Question

Guys, on my XJ, I have one switch on the right side of steering wheel, near the rear wiper switch. It's written ''trans -power and -comfort. What is going on when I switch this on a "power"? I usually tow my boat behind and I would like to know if there is some improvement with switch in "power" position? Thanks.

Matt Macchiarolo · Accepted Answer

That switch probably changes the shift points..."power" will make shifts athigher RPM's to get better performance or under load. That's an educated guesson my part.* * *Matt Macchiarolo

gassboy · Answer

mikltaz · Answer

on my 90 xj it delays upshifts untill around 3000 rpms and wont allow thetorque converter to lock until about 50 mph.  also it lowers the mpg byquite a bit.  however when i tow my trailer it makes a big difference in thehills.

gassboy · Answer

Thanks.

L.W.(Ãill) · Answer

It may not allow overdrive, here in Kalifornia, it's definitely notneeded as our maximum tow speed is fifty five miles per hour.         God Bless America, ßill O|||||||Omailto:          wrote:

Jeff Strickland · Answer

The Power position will carry the current gear to a higher engine speed before shifting, and allow downshifting earlier. The Economy or Comfort position will allow early shifts to conserve fuel, and it will delay downshifts.

While dragging your boat, you will probably like the Power setting best. You should also use a setting that will defeat the overdrive function if you get to a hill. Basically, if the trans is constantly shifting into and out of overdrive, then you should set the selector to prevent overdrive from being selected while the conditions exist that cause the shifting to occur.

Most automatic transmissions today are 3 speed, with an overdrive 4th. Under load and climbing a hill, the trans will shift back and forth from 4th to

3rd, and this is generally not a good thing. If the downshift and subsequent upshift is only going to happen once or twice, then allow the transmission to make the calls, but if you are going up a long hill and the downshift comes, then the upshift and then the downshift again, lock the trans in the downshift gear until the conditions go away that cause the transmission to search for the right gear.

gassboy · Answer

Thanks Jeff, one more thing... This my first Jeep and first car with 1st and2nd gear together on same position on shifting lever. What do you suggestabout going a long downhill and I still want to use both - 1st and 2nd gear.I'm afraid to shift manually down from 3rd one. Seems to me liketransmission will shift directly to 1st gear? On my previous car, both lowergears were separated.

L.W.(ßill) · Answer

God Bless America, ßill O|||||||Omailto:      wrote:

Jeff Strickland · Answer

The transmission is smart enought to not shift into a gear that will cause it to explode. Pay attention to the upshift points. If the shift from second to third can be forced to happen (full throttle accelleration) at say 40 mph, then any time you are going below 40 mph, you can shift into 2nd to control your downhill speed.

What happens with the 1/2 position is the truck starts out in 1st, and is limited to 2nd on the upshift.

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Power transmission switch?

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