P0740 42RE -- Typical hwy RPM? - JeepForum.com

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post #1 of 6 Old 02-24-2008, 10:23 AM Thread Starter
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2001 WJ 
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P0740 42RE -- Typical hwy RPM?

I've got 01 Laredo 4.0L & 42RE that is reporting a P0740. I am trying to determine if its really slipping, or just the TCM telling the PCM to illuminate the check engine light.

I started getting the classic 1-2 shift hunts at low speed, that are likely the Governor Pressure sensor & solenoid. Thanks to this forum and Dr.Righteous on JU, I was planning on replacing those. The new P0740 has me worried.

I was hoping the the failing GPS finally threw a code to the TCM, told the PCM, then turn on the light.

How can I determine if it really the TCC slipping?
What RPM is typical at 65mph for a stock WJ 4.0L?
Any help is appreciated.

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post #2 of 6 Old 02-24-2008, 10:57 AM
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nea, i cant help ya none, but hey, welcome to JF.

and where are you in norcal? i am just outside of sacramento.

hard working private first class in the United States Marine Corps.

Originally Posted by shift_grind View Post
It's threads like this that make me wonder why people lift there jeeps
its comments like this that make me wonder why some people are jerks.

build thread:http://www.jeepforum.com/forum/f197/...ndard-1056365/
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post #3 of 6 Old 02-24-2008, 02:36 PM
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My highway RPM is just under 2500 if I remember correctly and that's at around 65-70mph.


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post #4 of 6 Old 02-24-2008, 02:42 PM
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Depends on the rear gears. Our 99 4.0 42RE turns about 2k at 70mph with 3.55s.

99 WJ Laredo - Mine once again!
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post #5 of 6 Old 02-24-2008, 02:53 PM
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2K @ 65 mph (4th gear & torque locked)

2000 WJ 4.0L 42RE 242 TC
190,091 miles & counting
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post #6 of 6 Old 02-24-2008, 07:26 PM Thread Starter
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THanks for the response.

How is one to tell when the torque is locked at fwy speed?
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