Harmonic Balancer Size

[Whitehot]

What s the diameter of the factory one??

[Whitehot]

99GT 4.6 V8....

[ZR]

Either.......

-look up part number of your current balancer (will give you percentage of overdrive plus diameter)
OR
-Google search stock '99 GT harmonic balancer diameter

[ZR]

Google search says, 6.5" Crank pulley.

[Whitehot]

I couldn t find the size on google, but that 6 1/2 is helpful ;)

[Whitehot]

So... in theory , if the harmonic balancer is now 7.5 instead of 6.5 ... to ease up on the Alt, change the pulley on it as well??...

[RedSN]

My obsessive compulsive disorder tendencies are tugging at me to change the thread title to: "crank pulley size"

But I can't because I'm not a moderator.

[Whitehot]

ok.. either way, its big ;) lol.... and may contribute to the overspinning of the Alt... hence my question about a bigger pullie on the Alt....

[Hotford]

Just make sure to shave down the crank sensor housing down before you install the 7.5 damper or it will hit.