5.0 Jeep YJ

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Thread: 5.0 Jeep YJ

  1. #1
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    5.0 Jeep YJ

    I am in the process of getting parts together for the install of a 5.0 into my YJ. To start with I use it for only mild 4wheelin' and want to keep drivability on the highway. The engine I have is a 1986 Mustang Cobra 5.0 roller cam HO. I am looking at using a M5R2 5 speed trans and ? tcase from an F150/250. The question I have is if I will have to replace the stang's flywheel and clutch or will they work with the new trans?Starter?

    Any help will be greatly appreciated. Thanks

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  3. #2
    Registered User Dan's Avatar
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    Re: 5.0 Jeep YJ

    depends on the bellhousing you use.

    The mustang starter doesn't work with the truck bellhousing, the mustang bellhousing doesn't work with the truck transmission, the truck starter doesnt work with the mustang flywheel

    the easy solution is use the truck flywheel and truck bellhousing, but be careful and make sure you have the correctly balanced flywheel for the motor, there were two different imbalance for ford 302's
    Professional Driver on a Closed Course. Do Not Attempt.

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  4. #3
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    Re: 5.0 Jeep YJ

    5.0 HO (there was no "cobra motor" in 86) uses a 50oz imbalance crank. From there you have several sizes of flywheels and flex plates available. 157 tooth for c4 and t5 bell housings. 164 tooth for AOD.
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    Re: 5.0 Jeep YJ

    Thanks for the help. I hope to have all my parts together ASAP and have the beast in running shape by summer so I may be asking some more questions as I go.

  6. #5
    Registered User Dan's Avatar
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    Re: 5.0 Jeep YJ

    Professional Driver on a Closed Course. Do Not Attempt.

    92 YJ. Its not Gord's anymore.

  7. #6
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    Re: 5.0 Jeep YJ

    I have searched all over the internet and on numerous Jeep forums and have no one that has tried to put the M5R2 trans in a Jeep. Will this not work or is it a bad swap? I really want a 5 speed but can't seem to find an AX15 close by that people don't want a mint for. I can't see anything wrong with the Mazda trans as it is used behind a ton of 302/351's in a pile of F150 and 250's without too many complaints.

    Any ideas would be appreciated(Keep in mind I am not planning on beating the crap out of this thing(well maybe a little but not extreme)

  8. #7
    Registered User Dan's Avatar
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    Re: 5.0 Jeep YJ

    I used an NP435 because I had it laying on the shop floor already. If I didn't already own the transmission and transfer case, I may have used a light duty five speed

    Actually I probably would have used a Chevy engine and 700R4 or 4L60E, but I just matched the engine to the parts I already had

    How much do you wanna pay for an AX-15? I have one that I want $250 for, and how much can shipping cost?
    Professional Driver on a Closed Course. Do Not Attempt.

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  9. #8
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    Re: 5.0 Jeep YJ

    There is lots of info here

    http://www.bc4x4.com/chrisw/


    And there thread on pirate4x4 about it.

    Basically like was stated above use truck stuff and have the flywheel balanced.
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  10. #9
    Registered User Davel's Avatar
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    Re: 5.0 Jeep YJ

    Quote Originally Posted by Dan View Post
    I used an NP435 because I had it laying on the shop floor already. If I didn't already own the transmission and transfer case, I may have used a light duty five speed

    Actually I probably would have used a Chevy engine and 700R4 or 4L60E, but I just matched the engine to the parts I already
    Granny low is awesome but I really dont like driving with the NP 435 on the street. Not as ideal as a light duty 5spd/auto for a mild wheeler as Dan said.

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