351M Flywheel
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351M Flywheel
Hey guys, I have a 1978 F-250 2wd with the 351m and 4 speed transmission. I need a new flywheel for it. I want to order the flywheel before I take out the old one but there are two types and I don't know which one I need. Is there any way to know which one I have w/o removing it or is that the only way? Everywhere I look it is a special order and I don't want to order the wrong one and delay the process any longer. I can't physically check anything until about a week or so since I am still on deployment but I want to get the ball rolling as soon as I get back or before then if possible. Any help is greatly appreciated. thanks guys
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Because when I replaced the exhaust manifolds, the starter has to come off and the teeth are ground down where the flywheel and starter contact. The truck only starts when the teeth line up just on the right spot.
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From: Duncan B.C.
I didn't even know there were 2 types of flywheel for a 351m. Are they for different size clutches or something? If so, maybe you can measure the bolt spacing with the inspection cover removed to determine which one you have. Just throwing out ideas.
Laughing Gas
Joined: Dec 2007
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From: Alvarado, TX
Isn't the number cast on the engine side of the flywheel? I would think you could pull the inspection cover and rotate the engine till you can see it. By the way I have one in good shape if you happen to be stationed in So Cal.
Lead Driver
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It's been a while since I've been through this so I could be wrong but I seem to remember one is drilled for the long style psi plate, the other for the diaphragm style psi plate.
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From: Ilion Herkimer
why don't you just have a new ring gear installed ?. any transmission shop can order and install the ring gear. no need to order the whole assembly.
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Ford Parts Specialist
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From: Simi Valley, CA
D7TZ6384A .. Flywheel Ring Gear-180 teeth / Available from Ford
Fits: 1977/82 351M/400 / 1983/97 460.
MSRP: $69.38 // FTE Ford Dealer Parts Dept sponsor PARTSGUYED.COM price: $49.96
PARTSGUYED = Horizon Ford in Seattle (Tukwila) WA
Originally Posted by F350BRCO
The only thing I would see different is the 351M uses an 11' clutch assembly and the 400 uses a 12" clutch.
The pressure plate's bolt circle pattern on the flywheels is specific to one or the other.
Elder User
Joined: Oct 2008
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You can do it yourself. Set your flywheel so one side sits a few inches off the edge of your workbench then work around the ring gear with a punch and push it off. Then use the freezer/oven method to put a new one on. Piece of cake
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Hey thanks guys. A lot of good information I can use. The two types of flywheels makes sense with the different clutches and engines. I will probably end up going with the new ring gear as long as the old flywheel can be resurfaced. I just don't know the total condition of it until I get it off the truck. The PO didn't really take care of the truck and I don't even know how one can do that much damage to the flywheel but oh well. I only paid $150.00 for the truck and I've put about $2500 into already. And Fordworth I'm actually in WA state. Where do you live in socal? I am actually from there (SD).
Laughing Gas
Joined: Dec 2007
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From: Alvarado, TX
I'm in south OC. I you're interested send me a PM on here so we don't get in trouble for selling stuff in this forum.
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Joined: Feb 2003
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From: williamsport PA
If you would like to know how the ring gear can get chew up. One way is to buy a off the self starter from the auto parts store. Don't ckeck it over realy good, put it on. about a year later replace the starter, because it don't turn over engine. Find that the nose cone blow up into small peices and parts of your ring gear teeths are missing. Then take that same starter to a local starter rebuild shop. Find out that the starter had the wrong nose cone on it. All most the same but didn't let the gear come in complete contact with the ring gear. An also not sitting completely into the bell housing. But still living on barrow time with the ring gear.
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