Is the flex plate/ flywheel the same for the auto tranny as the manual? I'm swapping in a 304 that was hooked to a manual 3-speed to my '85 CJ7 that had a 258 and has an auto trans. Do I need to locate a flywheel from a 304/Auto trans, or will the torque converter bolt up to a 304 manual trans flywheel?
Post in the wanted section of the classifieds on this forum. That's where I got one. Re-balancing is done at a machine shop. Cheaper to purchase a used one probably. I'm not certain if it is possible to do without the crankshaft out.
'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20. 1986 CJ10-A SD-33 Diesel/727/np208 1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's YJ Buggy Build Current project. Stroker/FI ?
1990 MJ Comanche 4.0L AX15/np231
Each AMC engine has a unique harmonic balancer and flexplate (fly wheel if standard transmission) and cannot be mixed between different types of engines. A 258 cannot be put on a 304, 304 cannot be put on a 360 etc. However a they can be changed between the same engine, 304 from one engine will go to another 304.
So as Biotex said, you might do better finding a used flexplate from another 304 verse the expense and logistics of balancing .
Don't know exactly where you are, but I have a 304 flexplate I just removed from the motor I am dropping in my CJ5. It's yours if you want it, just pick it up or pay shipping and I will get it on it's way to you. Let me know, I will be back on here tomorrow night or sometime Friday.