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Old September 29th, 2011, 12:37 PM   #1
mikeb99xj
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Default 99xj 4bt conversion?

i have a 99xj and i managed to melt my cam positioning sensor and blew my 4.0 and i managed to acquire a 4bt from a van that was going to get scrapped. Im wondering if anyone can point me in the right direction for motor mounts for the swap, and if anyone has heard of using a 47rh in the swap.
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Old September 29th, 2011, 01:15 PM   #2
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Screw the 47rfe just keep the th400 from the van. Blow some smoke and climb some rocks!!
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Old September 29th, 2011, 02:29 PM   #3
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Have you measured if it really fits? I would think mounts are just a welder away. Don't think anyone sells them. Thats a big heavy motor for a unibody.
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Old September 29th, 2011, 02:37 PM   #4
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Quote:
Originally Posted by Haggar View Post
Thats a big heavy motor for a unibody.
Thats kinda what had me going

I would be truly amazed if there were off the shelf motor mounts for that combo...

Good luck...do a build thread please :)
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Old September 29th, 2011, 02:50 PM   #5
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i was thinking if i couldn't find motor mounts that i would use the subframe from the van and modify it to fit in between the unibody rails, since the motor mounts are connected to it and it would increase the strength in the front of the jeep. as for the th400 i dont know alot about transmissions but i dont know if it will be handle the torque i want to get where the 47rh can handle 450ft lbs and bolts up to the 4bt. I believe the 4bt weighs around 700 lbs and the 4.0 is around 500
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Old November 10th, 2011, 08:44 PM   #6
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its been done, your going to have to do a lot of frame stiffening, and get stronger springs up front, but it makes one bad ass jeep.
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Old November 12th, 2011, 04:22 PM   #7
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yea i would weld some plates on the whole front of the unibody before building and welding up the motor mounts.
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Old November 13th, 2011, 05:46 PM   #8
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The 47rh is a good tranny option, although expensive. If you do have a chevy auto adapter, you could either sell it for 700-900 on ebay and use it towards a 47rh, or use that adapter to mate up a 700 r4, which can be built to handle a 4bt, plus you get overdrive, which you will need, as the max rpm of a 4bt is around 2,300. If you decide to go manual, I have some adapters available. If you go with a 47rh, try to get the t-case in the deal.
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