ok this is what i have . 89 jeep cherokee 2 door renix motor 35 rear 30 front 3 in lift [junk yard ] i have been told to change the head up to tb from a ho 4.0 i need to know if there is any machine work i need to do besides getting head shaved and other tweeks such as will the existing bolt holes line up or will i need to tap new ones . and i have a ax-15 trans and a new 231 t-case to go with but they came out of a dodge truck and jeep is a automatic so what bell housing do i use . ok this is the last one lol i have a 8.8 rear end and am fully cap. of doing the welding but do i stick with the dana 30 i have in the front or is there something better to go with

 

renix have smaller intake and exhaust manifold port than the ho 4.0s swaping the head will not really increase any flow unless you have the intake and exhaust port matched to the ho head

 

there are also tps issues involved with the two different ecm controls renix versus odb system

 

^what freegdr said. The only way to convert a renix to HO is to swap the head, intake, exhaust and the entire wiring harness. Granted you can get by with just the head, intake, and exhaust swap

For the bell housing: I'm not sure if the dodge one will work but if it doesnt, i recommend an external slave bell housing.

 

Correct. You can get away with just the intake exhaust and head. Its easy but you will need some more parts.


You said you want to change to a TB from a 4.0 and that your Renix. To me almost sounds like you have a Carb but im sure you dont.
Check out this link its all you need to upgrade to a Renix/HO hybrid
click here

 

no i have a tb ,but the point is im trying to get the most out of this jeep for my son im really just looking for suggestions i will gut and swap everything from a ho. motor if i got to just need to know what the best parts are i can do fast cars but my boy like 4x4 and has got me in head first lol did the injector upgrade went to electric fan msd distributor dual exhaust but like the deferential s should i stick with the dana 35/30 what about the lift is the 3" enough i got a z71 that i take to youary and he wants to go as well just need someone to point me in the rite and affordable direction

 

Whats the overall condition of this jeep and whats your goal. You havent been the clearest or I'm just not understanding you.

If you want cheap and running jeep for your son, then get the renix system working and drive it as is. You really only gain like 15 hp from converting it over to HO system. oh and you get a check engine light with HO too, kinda nice when diagnosing electrical problems.

Or if you want to go all out then find a 92-95 HO motor complete and grab the ENTIRE wiring harness. Find a clutch assembly and bolt on the AX15/231. Drop it in and have fun. I would keep the axles in it until you 'need' to upgrade. 97-99 d30 and a ford 8.8 would be a good combo for anything up to 35-37's

 

i want it to be able to go where he wants as in mud ,trail and not wory about being stranded the motor was rebuilt two months befor i got it runs strong and starts every time changes nicely but i dont think the auto trans will handel the bigger tires and the offroading and it has very little get up and go [i believe its the gearing in dif] i want him to have a useful dd and a little bit of a toy kinda happy medium

 

What size tires? Larger tires will kill the power output with stock gearing, most auto's came with 3.55, some with tow package has 3.73. Swapping in an ax15 wont do much.

Where in NC are you? I'm in WNC

A tranny cooler will do wonders to keep alive the auto trans. These trans are about as bullet proof as the motors as long as they stay cool.

 

im in greensbor . im running 31/10.5/15's now but tred 33/12.5/15's and could bearly get on the highway the reason i asked about the swap to a manuil is my 95 has 33/12.5 on it and its like i never changed sizes but i put 44d and 40d with 4.10 gears on it and was trying to figure out where the problem lied i thaught maybe the trans but like i said im new to the 4x4 thing so i kinda feel like a idot here lol

 

I'm in fletcher, between asheville and hendersonville. Yea the gearing between the jeep manuals and auto tranny's are alittle different. Stock manuals came with 3.07 and auto's are 3.55, if that tells you something.