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View Full Version : 5.0l flywheels..... could this be my vibration issue?


Squishy
03-06-2007, 01:14 PM
i am wondering if anyone on here knows what weight flywheels are available that will work with an np435 transmission. truck vibrates like a bitch and im wondering if its the doubler or possibly the wrong flywheel was put on, because when i put my foot on the clutch while driving at highway speeds, and the motor settles down to idle rpm's, ALL vibrations go away and the truck is smoother driving than my stock ranger.

what are your thoughts, sound like it could be the flywheel? im sure there are 2 weight flywheels, but need to find the proper one

OldEnuff
03-06-2007, 01:33 PM
there are 3 different flywheels that will fit on a 5.0

2 are meant for the engine but are different balance and you gotta have the correct one

the other is from the 300 six and is neutral balance and wont work either

It does not matter what tranny you are using

I can't remember how to tell which one you need :dontknow:

Squishy
03-06-2007, 01:44 PM
there are 3 different flywheels that will fit on a 5.0

2 are meant for the engine but are different balance and you gotta have the correct one

the other is from the 300 six and is neutral balance and wont work either

It does not matter what tranny you are using

I can't remember how to tell which one you need :dontknow:

so since i have a 95 mustang 5.0, i could just buy one off a 95 mustang then, rather than tryting to find out which one is what. that makes things a whole lot easier. thanks!

In The Zone
03-06-2007, 02:41 PM
there are 3 different flywheels that will fit on a 5.0

2 are meant for the engine but are different balance and you gotta have the correct one

the other is from the 300 six and is neutral balance and wont work either

It does not matter what tranny you are using

I can't remember how to tell which one you need :dontknow:

the difference is with the balancing on the crank internally or externally...

i Had the same issue when i switched to the 4 spd to mate with the 302 in the BII eventually

WagoneerXJ
03-07-2007, 06:28 PM
The way it breaks down is...:
1967 1/2 1979 302's 28 oz flywheel
1980-up 302 50 oz flywheel
ALL 351 Windsors 28 Oz flywheel.

Squishy
03-07-2007, 06:35 PM
im not sure which flywheel ive got on there, i guess my only option is to pull the tranny and weigh it or just straight swap it out. does anyone know if the mustang flywheel is the same diameter as the truck flywheel? i dont wannA swap it all and find out the starter doesnt line up. ill do some research and find out i guess

Nutbar
03-07-2007, 06:52 PM
I don't know for sure but the car clutches and flywheels are usually smaller than the truck stuff and it would not suprise me on the 5.0s that they would be smaller usually to do with clearance for the bell housing.

Squishy
03-07-2007, 08:26 PM
i need a flywheel for For a 50oz imbalance motor.

EDIT: just read up and apparently with the 50 oz imbalanced, it doesnt matter which way you bolt up the flywheel, is this true? if so, how much vibrations would i have if i have the 28oz flywheel?

WagoneerXJ
03-07-2007, 11:53 PM
i need a flywheel for For a 50oz imbalance motor.

EDIT: just read up and apparently with the 50 oz imbalanced, it doesnt matter which way you bolt up the flywheel, is this true? if so, how much vibrations would i have if i have the 28oz flywheel?


It would vibrate a good amount. I had an old 68 302 with the newer 50 oz flywheel on it....vibrated pretty hard at 1800-2000 RPM

Squishy
03-07-2007, 11:56 PM
It would vibrate a good amount. I had an old 68 302 with the newer 50 oz flywheel on it....vibrated pretty hard at 1800-2000 RPM

i dont have a tach, and not lookin forward to pulling it apart, but im hoping thats all that is wrong with it, i really wish i knew what the flywheel was off of.

barracuda
03-08-2007, 10:34 AM
there is a 28 oz flywheel (pre 82 i think) and a 50oz flywheel (post 82 and HO engines) was your engine manual to begin with? can you see any numbers on the flywheel?

Squishy
03-08-2007, 12:44 PM
there is a 28 oz flywheel (pre 82 i think) and a 50oz flywheel (post 82 and HO engines) was your engine manual to begin with? can you see any numbers on the flywheel?

i dont know and i cant unless i pull the tranny

OldEnuff
03-08-2007, 01:01 PM
i am wondering if anyone on here knows what weight flywheels are available that will work with an np435 transmission. truck vibrates like a bitch and im wondering if its the doubler or possibly the wrong flywheel was put on, because when i put my foot on the clutch while driving at highway speeds, and the motor settles down to idle rpm's, ALL vibrations go away and the truck is smoother driving than my stock ranger.

what are your thoughts, sound like it could be the flywheel? im sure there are 2 weight flywheels, but need to find the proper one


If the vibes go away at highway speeds when you put in the clutch it has to be coming from the engine bcause the rest of the drive line (tranny back) is still rotating at highway speeds

is there a difference in vibration between accelerating, decelerating and just maintaning speed.

boyzen
03-08-2007, 09:32 PM
sounds more like driveshafts to me I would check your angles first cause if it is driveshaft vibration then under load it will vibrate the most.

Squishy
03-09-2007, 12:19 AM
sounds more like driveshafts to me I would check your angles first cause if it is driveshaft vibration then under load it will vibrate the most.

it vibrates when i rev it, sitting at a stop, or even when i floor it in 4 low-low(going like 1mph) which is why im thinking its not in the driveshaft/rear end

Melvin
03-09-2007, 10:04 AM
Check ur balancer first. The 5.0 balancers are notorious for falling apart and giving u a vibration like youre describing. A lot easier to check that first than to have pull your tranny.

Dustbin
03-09-2007, 04:36 PM
Check ur balancer first. The 5.0 balancers are notorious for falling apart and giving u a vibration like youre describing. A lot easier to check that first than to have pull your tranny.


thanks marco, ill check tomorrow. do you know if the 87-93 balancer is the same as the 94/95?

Melvin
03-10-2007, 07:58 AM
Yes it should be. Usually balancers go off balance weight, not model year applications. Yours should be a 50oz for a 302 H.O.

Squishy
03-10-2007, 06:08 PM
Yes it should be. Usually balancers go off balance weight, not model year applications. Yours should be a 50oz for a 302 H.O.

i watched the balancer and all looked good:dontknow: , is there any better way to check it?

Nutbar
03-10-2007, 06:31 PM
You will want to try and find true TDC #1 and see if it lines up with the marks on the balancer. If it has spun it won't line up with the marks when the #1 is at TDC best way is to use a spark plug piston stop and a degree wheel.

epic3
03-10-2007, 06:42 PM
You will want to try and find true TDC #1 and see if it lines up with the marks on the balancer. If it has spun it won't line up with the marks when the #1 is at TDC best way is to use a spark plug piston stop and a degree wheel.

that wont work on fords

Squishy
03-10-2007, 06:47 PM
that wont work on fords


what will:dontknow: gas?

epic3
03-10-2007, 06:53 PM
what will:dontknow: gas?

with a 60-1 of oil mixture[cheers]

blacker_69
03-11-2007, 12:06 AM
the 302 and 351 are externally balanced engines, ie harmonic balancer and flywheel, there is only one way to bolt up the flywheel, offest holes in the crank. try you best to check in through inspection ports (if any cant remember on the 435) and check to see if its cracked at the crank bolts area. post up with any info

Squishy
03-11-2007, 11:10 PM
the 302 and 351 are externally balanced engines, ie harmonic balancer and flywheel, there is only one way to bolt up the flywheel, offest holes in the crank. try you best to check in through inspection ports (if any cant remember on the 435) and check to see if its cracked at the crank bolts area. post up with any info


everything i read so far says the HO 302 is internally balanced? ill have to look into it again, but im 90% shur

Nutbar
03-12-2007, 04:59 AM
If the flywheel is offset weighted then the engine is ext. ballanced, ie. 50 oz weighted 5.0 flywheel.

If it was internally ballanced the flywheel and balancer would be neutral balanced (no offset weight) and it would not matter what position the flywheel is mounted.

Squishy
03-12-2007, 03:33 PM
If the flywheel is offset weighted then the engine is ext. ballanced, ie. 50 oz weighted 5.0 flywheel.

If it was internally ballanced the flywheel and balancer would be neutral balanced (no offset weight) and it would not matter what position the flywheel is mounted.

mikey always trying to be the smart guy:fighting0071:





















thanks, now i know:D

Squishy
03-14-2007, 04:47 PM
that aint right, now anyone got a balancer?

Nutbar
03-14-2007, 06:20 PM
Yep Squish that is definately a spun balancer :confused0006:

weed_420_machine
03-14-2007, 08:12 PM
ummmm may-b check ur harmonick balancer:confused0006: lol thats mint