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Old July 26th, 2009, 09:10 AM   #1
rentalrider
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Default flywheel advice, ford motor/trans in cj7

Well, still moving forward with the transmission swap in my '86 cj7. I have an '86 mustang 5.0 in it and *possibly* (I think) the flywheel and bellhousing to the mustang as well. The T18 I'm putting in has it's own bellhousing and I'll be switching to a fresh hydraulic clutch. The t18 is out of an '80 ford 4x4 based on the numbers. My question: I'm told the flywheel would need to be switched out. How do i know which i have and where's the best/cheapest place to obtain a replacement assuming I need one. And the starter? can I assume the starter would be different, too? Thanks in advance for the help.
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Old July 26th, 2009, 09:16 AM   #2
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first make sure both flywheels have same # of teeth. second would be th weight of the flywheel in oz.. these may help:

http://www.mustangtek.com/flywheel/Flywheel.html

http://www.rowand.net/Shop/Tech/Ford...Flexplates.htm

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Old July 26th, 2009, 01:05 PM   #3
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I'm about 98% sure the flywheels are different from the truck to the car.

The 2nd link is already posted.

The Mustang one should have the 157 tooth wheel, and the T18 would be the 164 tooth.

Flip the flywheels over so you're looking at the back of them, check the counterweight block cast into them. If they look roughly the same size (amount of material wise) they'll switch right out. If one looks to be about 2x as much material as the original mustang wheel, you're going to need to search around of another flywheel.

'80 was around the changeover year, but the mustang flywheel should have the 28oz counter balance IIRC from my own flywheel predicament.
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Old July 27th, 2009, 06:36 PM   #4
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86 mustang would be 50oz, count your teeth, 157 would be car 164 truck, if you need a flywheel that's 50 oz and 164 teeth look up a mid eighties truck with a four speed.
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Old July 27th, 2009, 07:44 PM   #5
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Thanks to all. So brewchief, I think you just answered my next question. I've got no problems mounting up a flywheel with different diameter (tooth count) as long as the weight is correct, right? Would I expect to have to change my clutch? (diameter and tooth count same) Or should this mount up, too? I know the pilot bushing will need to be changed as the nose on the two input shafts have a different diameter, but I'm told this should be no biggie? How about starter?

Last edited by rentalrider; July 27th, 2009 at 08:05 PM.
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Old July 27th, 2009, 08:08 PM   #6
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flywheel tooth count needs to match the bellhousing, that truck bell should be the 164 tooth, as long as the balance weight is correct you're good to go, clutch may or may not work, I just used a new napa flywheel and it had two bolt patterns for different size clutches. Not sure on the starter but you may need one, later model trucks went to the small gear reduction type, I am using one in my bronco and like it a lot.
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Old July 27th, 2009, 08:15 PM   #7
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whatever oz imbalance the engine came with keep that oz with the t-18 cuz u want the engine to rotate in balance. Of course make sure the tooth count matches the bell. Im sure some guys have said this im just adding what ive learned on my 5.0 swap.
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Old July 27th, 2009, 08:16 PM   #8
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i have a starter from a small bell c4 141t if interested, you prolly have a 164t truck flexplate though..
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Old July 27th, 2009, 08:19 PM   #9
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Thanks again all. And yeah 84mudder, I've got a feeling I'm gonna be needing a starter for the 164 as it looks just a little larger than what was on it. Thanks tho.
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Old July 27th, 2009, 08:27 PM   #10
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alrite thats what i had to do i have a big bell AOD and i just got a 79 f100 starter for 25 bucks new and it work great but thats an auto trans..not 2 sure on a manual t18 it may work.
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Old July 28th, 2009, 12:53 AM   #11
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Okay here is what I have 5.0 with Ford T-18

Flywheel off a 92 F-150 50-710 $71 advance auto

Starter im going with a PMG style 92 F150 97104 $164 advance auto (I have yet to find out if it will work I think it will)

If you need to obtain a bell housing seperator plate go to JeffsBroncoGraveYard.com get one from him $31 bucks summit and jegs do not carry one for 164 tooth fly's
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Old July 28th, 2009, 06:10 AM   #12
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Erock, sorry for the ignorance, but what is a bellhousing seperator plate?
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Old July 28th, 2009, 10:35 AM   #13
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Quote:
Originally Posted by rentalrider View Post
Erock, sorry for the ignorance, but what is a bellhousing seperator plate?
i think he might be talking about the block plate its a thin metal plate that mates between the engine and the trans, could be wrong tho.
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Old July 29th, 2009, 02:56 PM   #14
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Ford manual and automatics take a different starter. You will need one for a manual. The clutch is also different size between the cars and trucks(from what I have seen). The cars generally have a 10" or 10 1/2" clutch while trucks use an 11" or 11 1/2" clutch. I'm not sure if you can even bolt a car sized clutch onto a truck flywheel.

You know, the cable operated clutch isn't all that bad. You never have to worry about air in the lines or a master or slave failing.
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Old July 29th, 2009, 10:52 PM   #15
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Quote:
Originally Posted by rentalrider View Post
Erock, sorry for the ignorance, but what is a bellhousing seperator plate?
Quote:
Originally Posted by 84mudder View Post
i think he might be talking about the block plate its a thin metal plate that mates between the engine and the trans, could be wrong tho.
You are correct 84mudder

The clutch I went with is Advance Auto Parts MU64-1B I think it was about 140.00 and its a 11"

Last edited by Erock33; July 29th, 2009 at 10:56 PM.
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