what tranny do you have? if its the t4 or t5 you need to toss it. They can't handle a V8.
If you have a 4 speed, you might have a T176 which can handle moderate V8 power, or it probably is a T4. If its a 5 speed its a T5.
Get a Ford tranny to go behind it like a T18 or NP 435 and use an adapter to mate that to your tcase.
I know that M.O.R.E. has the right motor mounts that you need. They bolt on
The questions are all over the board.
What will I need to modify/replace in the drive train?
Your gonna have to replace the tranny, I'd look at a T-18 or a NV3550/NV4500 depending on your budget. Your Dana 300 should be fine. The AMC 20 and a V8 and 35's WILL NOT get along well.
Will I need to weld new motor mounts on?
You will need new Motor mounts. Try Novak Adapters, they're pretty knowledgeable. Also you will need some sort of tranny adapter. At this stage, you might want to convert to a hydraulic clutch. Its probably going to be a good idea to go with a new clutch set up (disk/pressure plate)
will I need to replace/modify anything else?
Count on it.
How can I figure out the type of tranny I have?
Post up a different thread and get the answers there. Also try looking on Pirate 4x4.com, they seem to be pretty knowledgeable on engine swaps in Jeeps.
Will this be a pretty major difference?
This will be a pretty big difference. You'll enjoy it. Thank god you don't have California smog
Take this time during the planning stage and think about your electrical system (what condition is it in), fuel system components (probably going to have to use new fuel lines and pump.) Cooling system, probably a good idea to go with a new radiator. Do you want to run electric fans/water pump? Are you going to run new gauges? If so, will they be electric or mechanical. What kind of exhaust are you looking at running and how will you run it. Start mapping out costs and add more $$$ because of the unforeseen things that always pop up.
I'm finishing up my engine swap and its a lot more expensive than I thought. Try to go into it with all the information and have a good idea of what to expect.
Just my $.02
5.3 Vortec, T18, Dana 20, AMC 20, Dana 30
97 XJ 2wd POS.
The AMC 20 and a V8 and 35's WILL NOT get along well.
the AMC20 should be just fine behind V8 power with one piece shafts. Thats the only upgrade I've done to mine and it's had ZERO problems behind my 300+HP 5.3L
1985 CJ7 Project Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning
Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...
Chrome won't get you home...BUT Rattle Can Black may just get you back"
Check out www.novak-adapt.com they have tons of good info about all types of engine/tranny/tcase swaps.
Your cheapest tranny option is gonna be a ford t18. I just wrapped up my t18 swap and I love it. If you don't want the granny low, then get a close ratio one. It will have nearly the same gear ratios as a T4, except it will be bomb proof, no overdrive, and a really low reverse gear.
The easy part is physically putting the engine, tranny, tcase in. The hard and expensive part is everything else that has already been mentioned
Keep in mind that the AA kit is for a SB Chevy rather than a SB Ford such as the Windsor. I'm planning a 5.0 Ford crate motor swap in my CJ now and have been collecting the parts so I have a few insights. Also search under 5.0 swap for some lengthy threads on the job. I was initially going with the Jeep T-18 for this project and have the AA kit for it which allows a Dana 20 T/C to be used, but I wanted more crawl than the 2.0 Dana 20 would allow, so I sold the T-18 and am now in the market for an NP435. I plan on using the Novak kit ($600 roughly), rebuilding the NP435 in the process of swapping in the new mainshaft and then using a Dana 300 T/C (same as you have right now in your CJ) with better compounding 2.64 vs. 2.0. This allows a direct bolt up of a twin stick. In your case, you already have the Dana 300 T/C so that's less cost and the Novak NP435 and AA T-18 kits are roughly the same price so take your pick. You will need a 70s Ford truck bell housing with the butterfly bolt pattern.
Keep in mind, the trans/TC swap depends on what you plan on doing with the rig. Me, I want crawl and with 5.38 gears, a 6.34:1 first gear and a 2.64:1 T/C, I should be able to get a respectable 90:1 in my CJ-7 versus the 57.8 I get in my Scrambler with the T-18 and the Dana 20 with 4.56s. That's a huge difference. If you want street, you might consider something else as first gear will probably be unusable anyway.
In any event, stay away from the AA Ford SB motor mounts. They suck compared to the M.O.R.E. ones.
As far as the AMC Corporate 20 goes, IMHO, it's plenty tough with one piece axles with an 8 7/8" ring gear, the weak spot is the axles and the rosette welds in the pumpkin break and the tubes spin. I had a AMC 20 with Mosers and an ARB in it with 33s and never had any problems. I can't vouch for 35s.
I think the swap will be fun. Take your time, plan it out (like others said) and don't get frustrated. Take the nose off the Jeep, making access easier and be prepared to ask a lot of questions.
PS: if you need an AA adapter kit for Ford bellhousing to Jeep T-18 PM me, I've got it.
Full-time Firefighter/Paramedic. IAFF Local 2915
"Chrome don't get you home"
You might find the correct swap kit over at http://bjsoffroad.com (they have FSJ swap kits for Chev, Ford and Dodge) I would sooner put in a 4.6L AMC 6 stroker with the 4.0 EFI and get nearly double the HP and torque without having to buy mount conversions.