03' motor and tranny swap with 98' GT PLEASE HELP!!! - Mustang Evolution

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Old 01-16-2010, 08:18 AM   #1
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Exclamation 03' motor and tranny swap with 98' GT PLEASE HELP!!!

ok currently i have 98GT motor and tranny (auto) and im in the middle of swapping in a 2003 motor and tranny (auto). i did my research for what i need on the motor swap. I plan on using my 98' wiring harness and 98' computer. now my problem is.... will my 98' harness and computer work with the 03' tranny. the reason i ask is because the 03' tranny is control thru the computer for the speedo and my 98' i have a small black gear inside the tailshaft of the tranny to adjust my speedo correctly because i have 3.73 gears. i looked inside the side of the 03' tranny and dont see a gear on the shaft to grab onto my speedo gear to control the speedo. will the speedo work correctly?? will the tranny even shift at all because of the difference?? i really need all the help i can $$ is tight and this my daily driver. please all advice would be greatly appricated
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Old 01-16-2010, 12:40 PM   #2
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

To make life easy & cheap stay with the 98 trans. Both are 4r70w's. Also I installed a 01 gt engine into a 96gt if you have any engine swap questions.
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Old 01-16-2010, 11:38 PM   #3
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

google google google man! i know how it is to have a daily driver down, both of mine our lol, im gonna look around and see what i can find!
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Old 01-17-2010, 03:32 AM   #4
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

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To make life easy & cheap stay with the 98 trans. Both are 4r70w's. Also I installed a 01 gt engine into a 96gt if you have any engine swap questions.
Cobra's never came with the 4r70w. 03/04 came with the T-56.
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Old 01-17-2010, 03:39 AM   #5
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

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Cobra's never came with the 4r70w. 03/04 came with the T-56.
03 GT motor & trans I assume the OP has.
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Old 01-17-2010, 03:56 AM   #6
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

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03 GT motor & trans I assume the OP has.
doh, reading comp>me. I'm so use to people saying 03 (Cobra)
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Old 01-17-2010, 08:08 AM   #7
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

Wouldn't the OP be better off using the '03 computer and harness? What are the differences between the '98 and '03 engines? Are they both 2-valve? 4V? If different, won't they have different sensors that the '98 computer won't be programmed to monitor? There is a difference in HP and torque between the two model years; correct? Seems like the '98 computer and software would "detune" the newer engine. I'm just asking because I don't know.
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Old 01-17-2010, 05:58 PM   #8
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

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Originally Posted by MetallicMist View Post
Wouldn't the OP be better off using the '03 computer and harness? What are the differences between the '98 and '03 engines? Are they both 2-valve? 4V? If different, won't they have different sensors that the '98 computer won't be programmed to monitor? There is a difference in HP and torque between the two model years; correct? Seems like the '98 computer and software would "detune" the newer engine. I'm just asking because I don't know.
You use the 98gt set up, injectors,harness,coilpacks,etc. The 98 computer will run the 03 engine just fine. (referring to the 2V). A hand held tuner will catch the slack. The 98 is programed for a 225hp engine.The belt configuration is different on the 03 but all of the accessory's are located in the same location. I ran a 01 engine in a 96gt with the 96 computer & it ran & performed perfectly.
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Old 01-17-2010, 07:31 PM   #9
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

Cool. I learned something. Even us old farts can still learn a few things...
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Old 01-17-2010, 07:55 PM   #10
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

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Cool. I learned something. Even us old farts can still learn a few things...
90% of my knowledge came from old farts!!
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Old 01-20-2010, 07:33 PM   #11
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Re: 03' motor and tranny swap with 98' GT PLEASE HELP!!!

No messing with the electrical side of the fuel system using the 98 PCM either.
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