bought a dodge 318/727 combo for the jeep!

[black87yj]

ok, i went and did it now. i got a 1979 dodge shortbed truck with the 318/727/203 setup. now i need to see if the 231 will swap out for the full time 203 ? is there a boneyard special drivers drop tcase that will bolt up thats better than the 231? maybe a fixed yoke type ? the engine is good the transmission strong.needs carb work and some cleaning of the vac lines. someone said there is a np205 that is drivers drop out there ? (gear drive and fixed yoke !) any help is appreciated.

 

[jps4jeep]

Anything is possible, depends how much money you want to spend.

I am assuming it is for 89 yj with stock axles (drivers drop) I would just re-use your 231. actually I would also consider looking for a 231HD or a 242 for the 6 planetary gear set opposed to 5 and the thicker chain. I know a number of people running V8's with stock 231's and have no issue.. if anything your axles will be your limiting factor.

The tf727 is a great transmission, nearly bullet proof, the 318, honestly I wouldn't bother. that motor puts out around 150 hp and 235 tq, which is fairly close to what a stock 258's 112 hp and 210 tq. And you will still have an inferior emissions system and problematic carb.

If it were me, I would build a 4.7 stroker, find a 4.0 mfi, get as much wiring as you can, bolt that to the tf727, use a 4.2 crank and stroke the motor. Should put out about 200+ hp and 300+ tq

 

[black87yj]

ya, i have a 91 cherokee to donate a 4.0 and my 4.2 block. maybe down the road i can put together a stroker. i was happy with the 4.2 in my 87 yj, but could see a little more power. i have a np207 in my wrangler now, a cherokee 231 and my son has a yj 231 thats stuck in 4 hi so maybe a good time to swap and do a sye. looking for a explorer rear axle down the road too....$$$$$$ lol. got the 318 donor truck for $250.00 an was cheaper than any 4.2 s i have found. i dont want fi. i'm a dinosaur and like my carbs. did motorcraft 2150,nutter and ign mods on my 4.2 and it ran sweet till it dropped a valve. maybe i,ll see what the axles are like under the donor , but i'm betting nothing to get excited about. (full time in all)

 

[black87yj]

ok found alot of info on 318 swaps on some other jeep sites. the fact is its doable and not as costly as some fear. (bought truck junked it and got a 25 dollar profit to start ) my motor and transmission were both shot so i'm ahead this way. i,ll take pics if anyone is interested.

 

[bobcat481]

pics are always good