Im about ready to peice everything together, but have a few more questions. 1. Is a SM400 tranny ok for the swap? If not what would be, SM420? 2. Will the block sit far foward enough to leave the t-case in the stock position (driveshaft issues) 3. Will I need to reburn the chip in the comp. of the truck, and how much does this run? 4. Need a faily cheap axel that is about the same width as the JEEP, what do you recommend? (I know, I want mogs too, but no $$ left)

Thanks :flipoff2: You guys are a big help.:flipoff2: :flipoff2: :D

What type of Jeep?
What year Jeep?
What type and year of engine?

Those things will help people help you.

Yeah, sorry about that. It's a 92 YJ and the motor will be a 350TBI

Hey Jeepman. If you get mog axles and find a way to make them work under your jeep please share. :) I have a '90 XJ and my measurements lead me to believe that the front axle won't fit with anything less than 8" lift. :( Oilpan clearance issues. Hope your swap goes well.

xj: i'm leaning more towards chevy or a ford 9 (or 8.8) But that is a damn good excuse to put 8" of lift on your rig.:flipoff2: :D :flipoff2:

I know this subject is been beat to death everyone, but just cant find the freakin' ansewers i need. Anyone know about that SM400, i need to know really fast. Any and all info will be great.

Mike :flipoff2: :nuke: :flipoff2:

I've never heard of a SM400 tranny.

If the computer is for an automatic and you are switiching to a manual tranny then yes, you would need to have a new chip installed. If the 350TBI came with a manual and you are swapping in a different manual then no, the chip is fine.

Yes, chances are your drivelines will need to be lengthened or shortened. This should be the least of your concerns.

What about exhaust, radiator, wiring harness?

whats a SM400?:confused:

Could you be taking about an SM465? It was used up to 1990 I think

Im not sure what manual trannies were available with a TBI motor though... I know the NV3500. Maybe the NP435 and NV4500 as well.

All good trannies except the NV3500.

Also, for an upgraded rear axle that should be close to what you need in length, I would look for a Ford 8.8.

Do a search here or go to JU where quite a few YJ owners have done this swap.

Hell imsorry everyone, I'v been looking at so many different trans. they are all running together. Its not a SM400, but a TH400. Its a 4 speed auto. Im not really worried about the rear driveshaft (sye) but i want to keep my front driveshaft the same lenght. In order to do this i need to keep the t-case in the same place. I would like to get a Sm426, but one og thoes that still work is hard to find. Thanks for all the help so far. :flipoff2: :D

Mike

These are not some final questions.
TH400 is a 3 speed auto
are you trying to use your stock transfer case ?
why is it so important that your front driveshaft stay the same ?
I agree w/8.8 for simplicity if nothing else


Atomic:
What is wrong with a nv3500 ?obviously not as stout as a 4500 but... ?I am not saying it's good or bad I just never heard anything bad about it so whats up w/it ? Thanks

With Ratbastard. These are NOT final questions. TH400 would work fine. With a manny bell the SM420 or 465 should almost bolt right up with mabe a drill and tap or two. Index hole and imput shaft should work fine. You're not planning on keeping your NP231 tcase are you??? this would be a huge mistake. And as far as keeping the tcase in the same position, forgetabout it. The TBI is MUCH shorter than the I6. However, this is a GOOD thing. Just move everything forward. Get as much reard driveshaft as possible.

I guess I really dont understand what you're doing here. Sorry. :confused:

I did a 350 - sm465 - np205 in my cj7 and I pushed it forward untill about 3" from the radiator hitting the cam pully and ran an electric pusher fan. My front driveshaft is about the same lenth as it was before. I would just bolt the whole assembly together after you figure out what you want to use and move it around till you get the same driveline lenth. Why are you so concerned about your front driveline, you should be concerned about your rear driveline angle.

You will need to have the computer reprogrammed if you are changing from auto to manual unless the auto was a 700R4 because it isn't electronically controlled. At least this is what Howell told me.

Originally posted by Mr.RatBastard

Atomic:
What is wrong with a nv3500 ?obviously not as stout as a 4500 but... ?I am not saying it's good or bad I just never heard anything bad about it so whats up w/it ? Thanks


They just have a poor history from the factory. Been redesigned 4 times. Some are good units but it's almost impossible to identify the good from the bad. They started putting them in full sized trucks in 88, now mostly S10's and Dodge dakotas. I would say it's a medium duty tranny. If you are going through the trouble of beefing up a jeep, why cut corners here? Integrated bellhousing design had problems with cracking as well.


Jeeperman,

Place your engine in the ideal spot. Dont worry about driveline lengths or you are going to end up with issues such as fan to radiator clearence or your hei distributor hitting the firewall. Get that engine in the correct spot... let it dictate the position or lengths of everything else!