Overdrive, is it the 4th speed or what?

[Barzef]

Hi,

Kj's automatic trasmission is a 4-speed type as written in specs.

is the overdrive speed the 4th one or totally seperate mechanism other than 4-speeds?

thanks inadvance

 

[Dave]

Yes, overdrive is 4th gear.


Dave

 

[CactusJacked]

3rd gear is 1.00:1, 4th is overdrive. The 45RFE (2002-early 2003) has a .75 overdrive. The 42RLE (2003.5+) has a .69 overdrive.

 

[tjkj2002]

3rd gear is 1.00:1, 4th is overdrive. The 45RFE (2002-early 2003) has a .75 overdrive. The 42RLE (2003.5+) has a .69 overdrive.

To add to this the 45RFE is actually a 5 speed trans since it has two 2nd gears.

 

[CactusJacked]

To add to this the 45RFE is actually a 5 speed trans since it has two 2nd gears.

Not really, but sort of on a stretch. Upshift and downshift 2nd gears are different ratios.
But it still goes 1-2-3-4, 4-3-2-1.

 

[Barzef]

Thanks for the answers guys

I am confused that when o/d is canceled engine speed drops 3 times from the start until reaching about 80kmph which suggests that the vehiche uses 4 speeds...

What do you think about the situation?

 

[dude1116]

Thanks for the answers guys

I am confused that when o/d is canceled engine speed drops 3 times from the start until reaching about 80kmph which suggests that the vehiche uses 4 speeds...

What do you think about the situation?

I'm confused what you mean. Doesn't your engine just coast when slowing down? My automatic doesn't down shift. With O/D on sometimes it can feel like a 5 speed with torque converter lockup but it's definitely a 4 speed...

 

[CactusJacked]

I believe he's referring to the engine speed (rpm's) dropping every time it up-shifts, and he seems to be seeing 3 up-shifts (2-3-4) even though it's not in OD.
Is this a CRD (diesel engine) by chance? Then you would have a 5 speed automatic, 545RFE.

 

[TheBlueKJ]

I believe he's referring to the engine speed (rpm's) dropping every time it up-shifts, and he seems to be seeing 3 up-shifts (2-3-4) even though it's not in OD.
Is this a CRD (diesel engine) by chance? Then you would have a 5 speed automatic, 545RFE.

I thought the 545RFE was the manual

EDIT: further research has shown that it is indeed an auto

 

[dude1116]

I believe he's referring to the engine speed (rpm's) dropping every time it up-shifts, and he seems to be seeing 3 up-shifts (2-3-4) even though it's not in OD.
Is this a CRD (diesel engine) by chance? Then you would have a 5 speed automatic, 545RFE.

Ah right. Makes sense now.

 

[Barzef]

I believe he's referring to the engine speed (rpm's) dropping every time it up-shifts, and he seems to be seeing 3 up-shifts (2-3-4) even though it's not in OD.
Is this a CRD (diesel engine) by chance? Then you would have a 5 speed automatic, 545RFE.

you are exactly right about what I wanted to say,

but nope it is 3.7 not diesel

why I am obsessed about this subject is my transmission problem couldn't be solved for about 3 months.

at the moment, if I deactivate o/d ("O/D off" is turned on), transmission works well, but while o/d is active ("O/D off" is turned off) and vehicle needs to down-shift from o/d to 3rd gear an abnormal striking is felt and after 10-20 strikes (and strikes gets stronger) check engine light turns on and an error with the 4th gear ratio appears...

so I am trying to figure out the source of the problem, TCM or gears them selves?

 

[dude1116]

you are exactly right about what I wanted to say,

but nope it is 3.7 not diesel

why I am obsessed about this subject is my transmission problem couldn't be solved for about 3 months.

at the moment, if I deactivate o/d ("O/D off" is turned on), transmission works well, but while o/d is active ("O/D off" is turned off) and vehicle needs to down-shift from o/d to 3rd gear an abnormal striking is felt and after 10-20 strikes (and strikes gets stronger) check engine light turns on and an error with the 4th gear ratio appears...

so I am trying to figure out the source of the problem, TCM or gears them selves?

Sounds to me like your O/D clutch pack is ******** the bed (for lack of a better term). Have a ****** shop hook it up to a computer and read out the CVI (clutch volume index) numbers. If they're out of range (Fundamentals or Forgetamentals Part 3 - Chrysler and Dodge | Search Autoparts <-- Ignore the part about the "dumb learn." Relearns are to be done by computer on these Jeeps.) then you likely have a problem with clutch material failing --> New/Rebuilt/Used trans time.

 

[Barzef]

Sounds to me like your O/D clutch pack is ******** the bed (for lack of a better term). Have a ****** shop hook it up to a computer and read out the CVI (clutch volume index) numbers. If they're out of range (Fundamentals or Forgetamentals Part 3 - Chrysler and Dodge | Search Autoparts <-- Ignore the part about the "dumb learn." Relearns are to be done by computer on these Jeeps.) then you likely have a problem with clutch material failing --> New/Rebuilt/Used trans time.

ok, I will do that, thanks for the suggestion