6066 (1960-1966) GMC Truck Club - GMC Medium Duty Flywheel Size SAE 2

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6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)

- GMC V6 and V12 Engines (https://6066gmcclub.com/forumdisplay.php?f=9)

- - GMC Medium Duty Flywheel Size SAE 2 (https://6066gmcclub.com/showthread.php?t=48083)

tommr

March 5th, 2014 03:00 AM

Re: GMC Medium Duty Flywheel Size SAE 2

2 Attachment(s)

Yes I want to lose this flywheel.. I don't need the extra rotating mass. got prices under $1000 18 months ago for a copy of this pot style flywheel. swapping out the non synchro Spicer 4 spd for a 5 speed OD Spicer. wasn't thinking heavy duty applications. thanks.

Funky61

March 5th, 2014 10:50 PM

Re: GMC Medium Duty Flywheel Size SAE 2

5 Attachment(s)

Here is the flywheel that came on the 401M;
16" across tooth to tooth diameter.
Not as concave as your tommr and used a 13" clutch.
Unsure of what size truck it was off of; Older Gent said a tractor trailer

tommr

March 6th, 2014 01:18 PM

Re: GMC Medium Duty Flywheel Size SAE 2

thanks for taking the time to post those flywheel pics. I think V6 has it right that I need a GMC 7500/8500 flywheel. thanks much.

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