AMC 360 - TF999 Flexplate Purgatory - JeepForum.com
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post #1 of 9 Old 09-14-2021, 08:04 PM Thread Starter
vmf214
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AMC 360 - TF999 Flexplate Purgatory

Long time reader, first time poster.

Short version - 3 year frame off 1986 CJ7 rebuild. YJ tub conversion and swap 258 to AMC 360 from a 1978 Wagoneer. The 360 was picked up as a core WITHOUT the original flexplate/flywheel. Engine was warmly rebuilt (pistons/cam/intake/carb/headers). Transmission is an automatic TF999.

I have read forums until my eyes bleed on matched AMC V8 flexplates. Somebody out there must have had to buy a flexplate. Using Rock Auto I get the following options -
Pioneer FRA 118 is weighted - Came in the 1981 CJ7 with a TF727 and 304. Pioneer FRA-108 is listed for the same vehicle with a TF904 and 304, but has no weight added. The specs indicate the FRA-118 and FRA-108 have the exact same dimensions, except for the added weight. My internet digging has indicated AMC 360 flywheels HAVE the added weights. So I'm leaning towards the FRA-118.

Anyone running a 360/TF999 that can supply their flexplate p/n?

THANKS,
Mark

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post #2 of 9 Old 09-15-2021, 06:59 AM
Axhammer
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I am not running a 360, but I did do a 4.0 inline six swap in my 1985 CJ-7.

I needed a flex-plate for my TF999, something that would bolt to to the 258 crankshaft on my 4.7 bored & stroked (4.0 engine), and then line up to the torque converter bolts of the TF999. I ordered a Pioneer flex-plate from O Riley’s auto parts. It was made in China, and it was junk, it wasn’t round, so I never used it.

I ended up sourcing an OEM flex-plate from an early YJ with a 4.0 automatic. The old rusty OEM flexplate spun much truer than the new junk from China. The Pioneer flex-plate is still hanging on the wall in my shop. It is in the center picture with three FP’s. The picture with a single FP is the old used YJ FP that is currently in my CJ-7 and working fine.

I recommend you avoid the Pioneer stuff from China, and source an OEM flex-plate for your swap.
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9D84774B-18C6-4B16-B08E-25A513A5DF9C.jpg   D5E6FB6A-07D4-418B-B030-7C097E4B8D36.jpg  

Why do I own a CJ? I like to “Balance the wrench and the steering wheel”
1985 CJ-7 Sebring Red, White hardtop, 284 CID inline six (4.7) TF 999 auto
2020 JLU Black, Black hardtop, EcoDiesel, 35’s on 2” Mopar lift
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post #3 of 9 Old 09-15-2021, 09:45 AM
wilderside42
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I have the same setup and had the same issue. I was taking out a 304 and read that the flex plate was not the same for the 360. My 360 came out of a straight shift and didn’t have a flex plate either. I searched and searched and wound up with an “ATP Z102” from rock auto and it seems to be fine. I can’t remember where I sourced this information but I know you have to get the flex plate for the correct size motor because they are externally balanced. This flex plate says it’s for a TF727 but from what I understand they are basically the same as a TF999.

Here is the link to the one I ordered and installed and have had no issues so far:

https://www.rockauto.com/en/moreinfo...&pt=8608&jsn=4


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post #4 of 9 Old 09-15-2021, 10:35 AM Thread Starter
vmf214
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Thanks!! I would love to find an OEM and will keep up the search. As for ATP Z102, it is the same as the Pioneer FRA-118. Rock Auto lists it for the same 1981 CJ7 with a 304, just a different manufacturer. The ATP flywheels are indicated as weighted and non-weighted as well.

Well at least I know I'm in the ballpark.

Thanks again.
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post #5 of 9 Old 09-15-2021, 10:59 AM
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Here’s one on epay.
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18040DC2-FBC5-4F50-8095-946404D0FEAC.jpg  

Why do I own a CJ? I like to “Balance the wrench and the steering wheel”
1985 CJ-7 Sebring Red, White hardtop, 284 CID inline six (4.7) TF 999 auto
2020 JLU Black, Black hardtop, EcoDiesel, 35’s on 2” Mopar lift
View my Pontiac in my profile
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post #6 of 9 Old Yesterday, 05:32 AM Thread Starter
vmf214
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Purchased - Thanks!
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post #7 of 9 Old Yesterday, 06:05 AM
Axhammer
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Keep in mind when you are installing the flex plate to the crankshaft it will only bolt up in one of six possible positions. The bolts are not symmetrically spaced.

And the same goes for the four bolts that attach the flex to the torque converter. They are not symmetrically spaced, they will only line up in one of four possible positions.

That’s gonna be a nice rig with a warmed up AMC 360.

What size tires and gears are you going to run? Keep in mind the torque converter in the automatic Transmission acts as a torque multiplier, so you don’t need to gear as low as a standard transmission would require. Additionally the TF999 has a low 274 1st gear ratio.

For example, my 1985 CJ-7 on 31’s with an automatic transmission and 273 gears actually works pretty good. I do have more power to get it rolling with my 4.0 based inline six that I bored & stroked to 284 CI (4.7). I believe 308 would be perfect for normal street driving, and 355 gears would be better for spirited street driving (drag racing).

Why do I own a CJ? I like to “Balance the wrench and the steering wheel”
1985 CJ-7 Sebring Red, White hardtop, 284 CID inline six (4.7) TF 999 auto
2020 JLU Black, Black hardtop, EcoDiesel, 35’s on 2” Mopar lift
View my Pontiac in my profile
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post #8 of 9 Old Today, 04:32 AM Thread Starter
vmf214
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My setup is an AMC 360 30 over with Wiseco 9.2 CR pistons, Lunati Voodoo cam, Performer intake and Quick Fuel 600 carb. Running 33x12.5x15 BFG ATs on 3.31 gears. This rig will see primarily road and beach, not mud and rocks.
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post #9 of 9 Old Today, 04:47 AM
Axhammer
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Those 331’s might be a good ratio with the TF999, if not they will be close, good for you.

I wish my rig had 331’s, they would probably be perfect with 31’s.

Why do I own a CJ? I like to “Balance the wrench and the steering wheel”
1985 CJ-7 Sebring Red, White hardtop, 284 CID inline six (4.7) TF 999 auto
2020 JLU Black, Black hardtop, EcoDiesel, 35’s on 2” Mopar lift
View my Pontiac in my profile
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