gear box has a mind of its own.

fish · Post by **fish** » Mon Jun 09, 2014 11:14 am

Hi all. My challenger seams to skip 5th gear. Only going in for half a second then overdrive. When the overdrive ia off it just stays in 4th. Kinda annoying as its not nice for cruise rpm. Any qlues as to why it would be being a prick.

quick6 · Post by **quick6** » Mon Jun 09, 2014 12:33 pm

Pretty sure it will be 4 speed, and it sounds like fairly normal behaviour in my experience. None of mine have wasted any time locking t/c once in 4th and they pull pretty well when they do, I always felt they cruised well. What size tires are you running?

fish · Post by **fish** » Mon Jun 09, 2014 2:11 pm

Just 31s wich are standard size option for the truck. its just annoying when cruising and you come to a hill and it goes to fourth in one jump. Revs pretty high and then back to od wich is a bit low.

Crash bandicoot · Post by **Crash bandicoot** » Mon Jun 09, 2014 5:06 pm

fish wrote:Just 31s wich are standard size option for the truck. its just annoying when cruising and you come to a hill and it goes to fourth in one jump. Revs pretty high and then back to od wich is a bit low.

it won't be 4th to 5th, it will be 4th to lockup. not a bad thing, just a pain.

fish · Post by **fish** » Mon Jun 09, 2014 6:37 pm

Im not familiar with the term lockup. What does that mean. And yes its a pain. Can it be resolved?

Crash bandicoot · Post by **Crash bandicoot** » Mon Jun 09, 2014 6:57 pm

fish wrote:Im not familiar with the term lockup. What does that mean. And yes its a pain. Can it be resolved?

torque converters are a fluid coupling. and lose about 10% of the engine's power to this.

Lockup occurs when the ECU deems there is minimal load on the drive line and locks the torque converter creating a mechanical drive between the crank shaft of the engine and the transmission. Thus reducing fluid friction to zero and increasing fuel economy.

It may be as simple as servicing the transmission(changing the fluid even) to remedy the situation if it is a recent development.

fish · Post by **fish** » Mon Jun 09, 2014 7:05 pm

i see, nope not recent only its been bothering me recently

well i guess thats it then

Crash bandicoot · Post by **Crash bandicoot** » Mon Jun 09, 2014 7:14 pm

fish wrote:i see, nope not recent only its been bothering me recently
well i guess thats it then

No, you can tweak the throttle position sender so the transmission changes gears slightly later, thus with the higher RPM it may force the transmission to be more decisive in its gear changes.

fish · Post by **fish** » Mon Jun 09, 2014 8:04 pm

i have the, (power, normal, hold,) button which I think it dose this more or less. are mitsi autos 4 or 5 speed

Crash bandicoot · Post by **Crash bandicoot** » Mon Jun 09, 2014 8:27 pm

fish wrote:i have the, (power, normal, hold,) button which I think it dose this more or less. are mitsi autos 4 or 5 speed

it will be a jatco JR405E 4 speed

gear box has a mind of its own.

gear box has a mind of its own.

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