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Unread 02-24-2008, 10:23 AM   #1
gmunee
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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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Unread 02-24-2008, 10:57 AM   #2
5.9 ANDY
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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.
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Unread 02-24-2008, 02:36 PM   #3
_Kyle_
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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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Unread 02-24-2008, 02:42 PM   #4
WiLieR
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Depends on the rear gears. Our 99 4.0 42RE turns about 2k at 70mph with 3.55s.
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Unread 02-24-2008, 02:53 PM   #5
indept
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2K @ 65 mph (4th gear & torque locked)
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Unread 02-24-2008, 07:26 PM   #6
gmunee
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THanks for the response.

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