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Re: [GMCnet] Final Drive Options and Recommendations [message #220334 is a reply to message #220331] Thu, 29 August 2013 12:15 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma:
Senior Member

On Aug 29, 2013, at 11:12 AM, Mickey Szilagyi wrote:

>
>
> Our 77 Kingley is in the shop and we've found that the final drive has a bad gear. Sorry, I don't know the specific name of the gear but our problem is that there is a lot of slack when the coach is first put in drive. The gears move a lot before it actually engages. I think we have a bad/cracked ring. Whether the pinion is OK is still being determined. We have a 403 and we believe the 3.07 OEM final drive. We're now trying to decide whether to fix the current unit or replace or upgrade it to a different ratio unit. We've read a bunch of info on the forum but still have a few questions.
>
> 1. On Gene's chart it shows a Toro 2.73 FD and then the Original 3.07. Does that mean the 3.07 was specifically developed for the GMC coaches or is the 3.07 a carry over from the Toros?
>
The earlier Toros used the 3.07.

>
> With the above in mind is repairing the 3.07 OK or should we change to another FD ratio?
>
> We have American Eagle aluminum wheels with Michelin 225/75R16E1 tires.
>
> We see Cinnabar has the 3.42 FD and JimK has 3.55 and 3.70 FDs.
>

I highly recommend the 3.55. I put one in years ago. Your choice of which one to use partially depends on how fast you drive. If you are going cross country on interstate highways and want to drive at 70 or 75 then I feel the 3.55 is just about right. It will put you rpm at about the peak torque and power range.
If you are going to drive slower you might want to have the 3.7.

Emery Stora
77 Kingsley
Frederick, CO

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