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Old 11-01-2017, 09:10 PM
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1989 YJ 5.7 Vortec w/ nv4500

Bought a jeep last spring with dead transmission and transfer case, old owner put in a 6 inch lift with 2 inch body lift (measured yesterday to confirm). Once I found out the transmission was toast I decided I was going to do a swap. Got a nv4500 with a np241 for free, then picked up a 5.7l vortec. Once I had the new radiator I started to mount the engine and transmission, then picked up a frod explorer with a ford 8.8 with limited slip and disk brakes, which is now installed along with a new master cylinder and proportioning brake valve.

I am wondering with this 6 inch lift and 2 inch body lift what size of tires can I run? It is currently sitting on 29 inch tires, they look a little small, the jeep is going to be used mostly in the mud. I have read a bunch of posts on here and can't really find anything on size of tires for this lift.

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Old 11-03-2017, 10:41 AM   #2
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To answer the tire size question, I would have to ask you a question. How much body are you willing to cut? You should be able to fit a 35 without cutting, maybe a 37. Pics would be nice too. We like pics.

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Old 11-04-2017, 02:34 AM   #3
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Originally Posted by Jamie1990Scott View Post

I am wondering with this 6 inch lift and 2 inch body lift what size of tires can I run? It is currently sitting on 29 inch tires, they look a little smal
I bet they do. I would like to see a pic of this
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Old 11-05-2017, 12:25 AM
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I'll take some more detailed pictures in the next week and post them (this is what I have on my phone). 1st picture is when I decided old engine was coming out, second picture is new engine with transmission mounted.
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Old 11-09-2017, 08:24 PM
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Engine bay, working on wiring.
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Old 11-09-2017, 11:02 PM   #6
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Did you notch the transfercase skidplate for the NV4500 or not?
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Old 11-11-2017, 08:52 AM
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Did you notch the transfercase skidplate for the NV4500 or not?
I mounted the nv4500 to the skid plate but I am probably going to get ride of it and make a better cross member then a seperate the skid plate.

Next time I have the body off I'll take some pictures and post them.
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Old 11-11-2017, 11:24 AM   #8
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I mounted the nv4500 to the skid plate but I am probably going to get ride of it and make a better cross member then a seperate the skid plate.

Next time I have the body off I'll take some pictures and post them.

I was just wondering because i did a NV4500 swap and with the way the 4.0 is mounted it requires notching the skid. I guess depending on how you mount the engine you swap that might not be needed. I reinforced the front with a metal rod that goes across the front and i have never bent it despite high centering it.
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Old 11-13-2017, 07:18 AM   #9
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Originally Posted by Jamie1990Scott View Post

I am wondering with this 6 inch lift and 2 inch body lift what size of tires can I run?
This is my last YJ with about 8" total lift and 35's.
At full stuff the rear tires contact the tub.
There is room for 37's here for sure.
Some bump stop adjustments would keep them out of the fenders and trimming the body will free up some up travel.

The 8.8 is mostly fine with 35's but the front Dana 30 will be at it's limit with that tire size, especially with the V8.


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Old 05-28-2018, 08:09 PM
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Been while since I have posted.

Got my dash swapped, engine running exhaust done. Took it for a test drive felt a little sluggish, decided to make sure I got the firing order correct. Turns out I got two cylinders swapped around, this thing has way more power than the initial test drive. The drive shaft let go. And dented up my exhaust and fuel lines, not sure why it let go here is to hope the company will warranty it.
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Old 08-06-2018, 10:13 AM   #11
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nv4500 questions

How does the nv4500 fit in your yj. You mentioned a 2 inch body lift. Any pictures would be great.

I am deciding whether to go with an ax15 or the nv4500 that I already own. I am doing a 5.0 ford conversion this winter and am starting with a clean 2.5/ ax5 yj. If the nv4500 fits right, I will go that way.

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Old 08-06-2018, 06:11 PM   #12
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How does the nv4500 fit in your yj. You mentioned a 2 inch body lift. Any pictures would be great.

I am deciding whether to go with an ax15 or the nv4500 that I already own. I am doing a 5.0 ford conversion this winter and am starting with a clean 2.5/ ax5 yj. If the nv4500 fits right, I will go that way.

Chris



I have a NV4500 in my YJ and i dont think i would do it again i would get a AX15HD. You will need a 1" body lift to clear the trans tunnel. And you have to modify the factory skid by cutting out the center support and welding in 1/4" plate for reinforcement. Then notch the front of the skid and weld in some round bar, its not hard.
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Old 08-07-2018, 08:36 PM   #13
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Thank you for responding. Are you running a 4.0 and if so are you running stock engine mounts?
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Old 08-08-2018, 12:00 AM   #14
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Thank you for responding. Are you running a 4.0 and if so are you running stock engine mounts?

yep, 4.0 stock engine mounts, no transfer case drop and a JKS 1.25" body lift. The shift tower sticks out above the floor even with the body lift the NV4500 is VERY tall. I made a metal box and slapped a Hurst shift boot on it. The t-case shifter is from a dodge ram and i had to modify the mounting of it a little because it didn't bolt onto the side of the advance adapters tailhousing like it did with the factory tailhousing.



And the t-case shifter is further back so i had to notch the floor of the tub and make a new cover (which i screwed up and need to remake). I really dont like the way the t-case shifter came out part of me wants to try a Novak shift lever but i just dont want to mess with it.
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Old 08-08-2018, 06:25 PM   #15
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Thank you. Those pictures are great. They help a lot. I have an nv4500 from a 95 chevy 2500 from another build I did. It's a tough call. It's sooo paid for.
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Old 08-09-2018, 06:56 AM   #16
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The NV4500 is also longer than the AX15 so you have to be mindful of how bad your rear driveshaft angle will be once it's swapped. I used the full bellhousing and tailhousing kit from Advance Adapters and saved quite a bit of length i would recommend against using an adapter plate. Depending on how much lift you go with you will probably need a super short SYE.

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