76 flywheel weight
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5th Wheeling
Joined: Aug 2020
Posts: 39
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76 flywheel weight
Hi there. Got a 76 f250 4x4, 390 with np435, big tires and looking to make it slightly baja ready. Still a big heavy truck that will be used in road frequently. Looking to replace the flywheel in the truck but having issues deciding on the weight of a new flywheel. I don't know if the one I just pulled out from when my dad had it is stock or not, weight a good amount so wanna assume it's the stock 38 lbs summit says the stock flywheel weighted. I'd like to go to a steel aftermarket one but summit list others that are more 28-29.5 lbs with only about 4 options, 2 of which beint steel and less weight. I've checked with ram and such and they don't list many for my combo that match factory weight. Would this be okay for the build? How would the 10 lbs affect drivability and clutch? Thank you!
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5th Wheeling
Joined: Aug 2020
Posts: 39
Likes: 1
Thread Starter
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5th Wheeling
Joined: Aug 2020
Posts: 39
Likes: 1
Searching by vehicle wouldn't bring that ram flywheel up so I assumed it wasn't working. Did end up going just by FE and found that exact one. Appreciate it. Just looking to learn and make sure I'm doing things right
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5th Wheeling
Joined: Aug 2020
Posts: 39
Likes: 1
I've seen alot of near 30 lb flywheels, just don't know what the 10 pound loss would do to drivability
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Lead Driver
Joined: Jun 2006
Posts: 5,627
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From: Near Yosemite CA
I'm not an expert by any means, however, I do remember reading an article years ago, you know, in those things we used to get called magazines 
lol and they took a 4 cyl Ranger and put a heavier flywheel in for slow off-roading, giving the engine more inertia... ? The rotating mass was heavier which slowed acceleration, but being heavier it helped with lugging, and keeping the engine from dying when worked at lower rpm's. So, I would surmise, going the other way, lightening the flywheel would have the opposite effect, quicker acceleration, but more apt to stall when lugged..?
lol and they took a 4 cyl Ranger and put a heavier flywheel in for slow off-roading, giving the engine more inertia... ? The rotating mass was heavier which slowed acceleration, but being heavier it helped with lugging, and keeping the engine from dying when worked at lower rpm's. So, I would surmise, going the other way, lightening the flywheel would have the opposite effect, quicker acceleration, but more apt to stall when lugged..?
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