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I had to put a 2003 wj 4.0 engine and 42re transmission in…

I had to put...

I had to put a 2003 wj 4.0 engine and 42re transmission in my 1999 4.0 wj. The engine runs good but the transmission wont go into OD and the trans temp light is on the dash. What transmission sensors do I need to change to make it read right? everything hooked up the same but Im assuming the internal sensors read different.

Mechanic's Assistant: Have you checked the fuses? The dashboard bulbs?

Fuses are fine

Mechanic's Assistant: What is the model of your '03 Jeep?

Transmission sensor issue

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

The 03 is also a jeep grand Cherokee 4.0

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Same as the 99

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Customer reply replied 4 months ago
I have called a salvage yard and im told the engine transfers fine but the only transmission that will work in a 99 is a 99.
Answered in 11 hours by:
3/8/2018
sprinkles08
sprinkles08, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 24,069
Experience: Chrysler/Dodge/Jeep master tech ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans Specialist
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

The transmission was not correct for the vehicle as you were told. All internal electrical parts were changed after 2000. To make this transmission work you would need to install the correct overdrive/3-4 solenoid pack with wiring harness, the governor transducer, governor solenoid, you would need to install a range sensor and bracket.

My goal is to give you the best experience possible! I hope I have earned a 5 star rating! Please remember to rate my service by selecting the 5 stars at the top of the screen before you leave today. If you need more assistance, please use the reply box and let me know.

sprinkles08
sprinkles08, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 24,069
Experience: Chrysler/Dodge/Jeep master tech ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans Specialist
Verified
sprinkles08 and 87 other Transmissions Specialists are ready to help you
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Customer reply replied 4 months ago
You are spot on. I had already ordered the parts by the time I got a response. Thank you
Customer reply replied 4 months ago
Back up lights only work once in awhile

I'm a full time tech and at work this morning, I'll get back to you as quickly as I can.

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Customer reply replied 4 months ago
BAS didn't fix it

I'm a full time tech and at work this morning, I'll get back to you as quickly as I can.

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With the key on and engine off, shifter in reverse with the wheels chocked and/or emergency brake set, is there power on the violet/black wire at the range sensor?

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Category: Transmissions
Satisfied Customers: 24,069
24,069 Satisfied Customers
Experience: Chrysler/Dodge/Jeep master tech ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans Specialist

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