304 auto/manual flywheel/flexplate - JeepForum.com

 
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post #1 of 7 Old 09-08-2010, 09:08 AM Thread Starter
RjTack
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1985 CJ7 
 
Join Date: Aug 2010
Location: Central/Western
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304 auto/manual flywheel/flexplate

Hi All,
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?

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post #2 of 7 Old 09-08-2010, 09:19 AM
BioTex
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2006 TJ Wrangler 
 
Join Date: May 2008
Location: Alpine, Tx.
Posts: 3,173
Automatics have flex plates. Standards have flywheels. You need a flexplate balanced for a 304 behind the motor, to go with an automatic. Hope this helps.

Edit:
While you have it apart, don't forget to change the pilot bushing/bearing.

'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
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post #3 of 7 Old 09-08-2010, 09:55 AM Thread Starter
RjTack
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Location: Central/Western
Posts: 275
Flex plate re-balancing

Anyone know if I can get my 258 flex plate re-balanced to use with a 304? If so were would I get that done?
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post #4 of 7 Old 09-08-2010, 10:01 AM
BioTex
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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
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post #5 of 7 Old 09-08-2010, 12:37 PM
h2ojeep
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1978 CJ7 
 
Join Date: Oct 2008
Location: Cottonflat, TX
Posts: 677
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 .

New is not all that bad a price

Flywheel, Automatic Transmission 8 Cyl AMC 304*5351820 by the Jeep Specialists | Morris 4x4 Center

Hope this helps
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post #6 of 7 Old 09-09-2010, 08:41 AM
Supertrucker
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1979 CJ5 
 
Join Date: Jun 2008
Location: Kentucky
Posts: 59
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.
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post #7 of 7 Old 09-11-2010, 12:03 PM
Supertrucker
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Join Date: Jun 2008
Location: Kentucky
Posts: 59
PM sent. Sorry for taking so long to get back to you. I broke down on the way home and spent last night at a lovely diesel shop in Lexington, Ky. I'll let you know what shipping costs Monday morning.
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304 , auto trans , flexplate , flywheel , torque converter

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