I have a 90 YJ and I have a chance to pick up a 318 engine with a 205 transfer case and a 727 tranny. How does this setup sound? Also I have a choice between the 205 or the 208 Transfer case Any input on this?
Read this one yet? http://www.jeepforum.com/forum/f12/5...-begun-994377/
He's didn't use the same tranny(s) but he did swap a 318. If I had to take a wild guess, I'd say that your TF999 probably has the AMC bolt pattern and won't bolt up to the 318, but I'm sure there's someone else here that knows for sure.
Transplanted '99 4.0, AX-15, NP231
Red Jeep club #8
97 ZJ Laredo
4.0, 42re, NP242
Was my daily driver, now son's college wheels.
Cant help you on the t-case but can give you a little transmission info. The TF-999 has a Jeep specific bellhousing and will not fit on the chrysler corporate bellhousing. You would be better off keeping the 727 vs the 904 based 999 anyway. They are virtually identical expect sizing of the parts. The 727 is just a beefier transmission. I would just try to sell the 999 off and get a few $$$ back from it.
As far as the 318 in the YJ that sounds like a great idea. I was planning and working on getting a setup similar to your idea put together for my 90 YJ but alas school and other plans (wife) came about so my $1300 budget is not less than $800, which I dont think is enough for what I want to do. I was going to use a MPI 5.2/5.9 hybrid using an old LA 318 block. Since my Jeep is already set up for a manual trans, I was going to try to go the AX-15/dakota route, but I may still be able to work a deal on the 5.9/46rh out of my dad's truck. I am not wanting an Auto, but at least its a 4 speed.
The only issue you will have with putting the 231 behind the 727 is the number of input splines. It should be a bolt up operation as long as you get the 23 spline input t-case found behind the ax-15.
here is a bit of info about t-cases that were put behind 727's/46RHs/etc:
The NV231 transfer case is used behind many V6 and V8 engines in pickups and sport utility vehicles.
The NV231HD, used in the 1994+ Ram with V6 and V8 engines, features larger bearings and a wider chain than the NV231. All versions of the 231 cases use three gears in the planetary reduction set.
The NV241 is essentially a NV231HD with six gears in the planetary set.
The NV241D is a heavier duty Dodge version of the 241, with a larger input shaft and larger bearings to withstand the torque of the V10 and diesel engines.
The NV241HD, an option on Ram 2500's and standard on Ram 3500's built after 1998, has a stronger case and wider drive chain to better withstand the shock of snow plow service, a PTO cover and drive gear, and an extra bearing to support the thrust to the main shaft created by a PTO adapter.
Except for dimensional differences and the PTO port on the NV241HD, all of the cases are almost identical in appearance. An identification tag is attached to the rear case of every transfer case. The tag provides the transfer case model number, assembly number, serial number, and low range ratio.
My 98 Ram 2500 w/a Cummins and 5 speed has a 241HD behind it but it looked just like the 231HD that was behind the auto I took out.
What if I just use the 205 transfercase that come with the 318 and the 727 trans. Anyone have any ideas on the trans mount. I know I will have to fab something up. If anyone has done this please send pics.
If you have the ability to fab up any necessary parts then feel free to use whatever you like. I have no problems with the 205 (as long as it isnt the divorced one YUK!). You can probably just use a trans mount for the rig that the setup came out of and just drill/modify your belly pan to accept it. Shouldnt be a big deal at all as long as you get the angle of the engine right (carb flange should be level with all weight on vehicle). Might take a little trial and error, but it should be a fairly simple and straightforward process.
i have a 318(out of a 78 dodge pick up) in my 87 yj thats bolted to the tf999 and stock transfer case dont know if theres any adapters cause i didnt do the swap. but it looks like its just bolted right to the tranny. Ill probably find out when i pull the engine to freshen it up a bit. definatly has good power though even though its just a 2 barrel carb, was looking around for a intake and 4 barrel to swap it out but money is very limited seeing how im planning on rebuilding the rear end or doing an axle swap.
It looks like its the stock radiator but i dont know if they came in 3 row but its cooling exept for the fact that it leaks. bottem casting on rad needs to be moved to the other side of the radiator though.
Its always awesome to give it a good rev near other people with yjs you get to see a little bit of eye opening when they hear a v8 in a yj.