I have a mustang GT motor that I am getting ready to put a np 435 behind. I am told that I need the heavier flywheel from a truck. Does anybody know what year they went to this? I was told a 6cylinder one will work but has to be balanced for the motor. One other question did the dana 20 ever come behind the 435 or t18? Thanks in advance! Later, Jake
www.inphobic.com

You need to find out what year your engine is. In 82 they switched from 28oz to 50 oz imbalance on the flywheel. They also went to a one piece rear main. I had a hard time finding an 11" 28oz flywheel from my 77 302. Ended up getting a nice one from toms bronco in Oregon. I the 50oz 11" flywheels seemed to be a little more common. Definately go for and 11" clutch.

The 6cyl flywheel will NOT physically bolt up. So no you can't use it.

The Dana 20 never came behind a NP435 or T18. However a dana 21 did. The dana 21 has no lowrange though. Unfortunately they are not easily interchangable with the dana 20.

The NP435 is a kick ass tranny. The adapter will cost you a few bucks, but after you own it, you can find trannies all day long for $100.

Cool thanks for the help. It's a 93 motor sorry I didn't state that.

Originally posted by Nobody

The 6cyl flywheel will NOT physically bolt up. So no you can't use it.



Yes the 300 I-6 flywheel will bolt on but will be out of balance. So you can get it rebalanced.

All 351W and 351C flywheels use the 28 oz imbalance as well so you can usually find big flywheels in those applications. (This doesn't help the orginal poster, just FYI)

Originally posted by emsoffroad


Yes the 300 I-6 flywheel will bolt on but will be out of balance. So you can get it rebalanced.

Errrr.....uhhh no it won't. If it does, it's fubar'd.

The common respones that I have been getting is to get a 6cyl flywheel and have it rebalanced. I wish I could find a 50oz flywheel here from a 302. The only ones I can find are new for $150. So anything after 82 will work then right?

I have a 6cyl flywheel in my garage. I looked into this. All the holes line up except for one. I also suspect that it would be expensive to have a flywheel balanced correctly for a 302.

I spent somewhere in the neighborhood of $140 for a reman flywheel. The thing looked bran spanking new. It was reground with new ring gear pressed on.

Most the wrecking yard wanted $50-$120 for a piece of shiat flywheel, that would need to be resurfaced, with a new ring gear.

Don't be a cheap bastard on a critical part like the flywheel. Just my .02

I think summit might even have one for $100 or so. 10.5" clutch though.

yur right, what the hell are you really going to save trying to find a junk 5.0 flywheel. Probably going to waste more time looking than it's worth. Thanks, Jake

Bolted a 83 300 flywheel onto a 69 302, just for a beater. Didn't care about the balance. Didn't look to hard at it just threw it on.

Originally posted by Nobody
I have a 6cyl flywheel in my garage. I looked into this. All the holes line up except for one. I also suspect that it would be expensive to have a flywheel balanced correctly for a 302.


No, they do fit, you just weren't lining the holes up right. It only bolts on one way. I've bolted them up before because they (well, some) are zero balance flywheels and a lot of race engines run zero balance cranks.

I'm running a 300 flywheel on my '90 Mustang 5.0. It bolted up just fine, but like CPMaverick said, it only goes on in one orientation. The bolt pattern is deliberately asymmetric, so you can't orient it wrong on the 302. Turn yours a bit, and you'll see!

Rebalancing the 300 flywheel is actually pretty simple, if you've got the balancing machine and you know where the imbalance goes relative to the bolt pattern. The place that did mine just removed 50 oz of steel from the backside of it using a 1/2" drill bit. Works like a charm...

Chris

Jake-

I was quoted $50 to get my bronco 302 flywheel rebalanced by a place in Sacramento. They were going to rebalance it just like cwate described. But then someone made me an offer I couldn't refuse on my old engine as long as I sold the flywheel with it. I paid $100 for my '86 F150 5.0 flywheel from a Sacramento truck yard (Subway Truck Parts, 888-600-9294). I scored. The ring gear was perfect. Had a friend resurface it for free. FWIW before I did any of the above I got a quote on a new F150 5.0 flywheel from Ford, it was around $250. I suppose my flywheel is heavy though I never compared its weight to anything else. All I know is I got it running last week and it hauls a$$.

Lars

Originally posted by CPMaverick


No, they do fit, you just weren't lining the holes up right. It only bolts on one way. I've bolted them up before because they (well, some) are zero balance flywheels and a lot of race engines run zero balance cranks.

I was lining the holes up right. I guarantee it didn't fit. Maybe the pattern on the 302, 5.0 cranks are a tad different. My engine is a 77 302.

No, they are all the same. The 250 6-cyl engines are the same too. The flywheel only bolts on one way, so if you don't have it perfect you can have all but one hole line up (I've been there). Keep spinning the flywheel and it WILL fit, believe me, there is no way it wouldn't.