| Re: Final Drive Options and Recommendations [message #220351 is a reply to message #220331] |
Thu, 29 August 2013 14:01   |
C Boyd
Messages: 2629
Registered: April 2006
Karma:
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Senior Member |
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Sir: I have seen a lot of the 3.07s have a lot of back lash. If it is running quiet with no leaks or metal shavings floating around (magnet on a stick stuck down in the fill hole) You might be OK. I would suggest getting someone more familiar with the GMC to look at it. If one gear is bad both will need to be replaced as they wear matched. If I had to replace Jim K has best warranty.
| mickey szilagyi wrote on Thu, 29 August 2013 13:12 |
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?
2. We have a 403, live in Michigan but plan to travel with the coach all over the country so the terrain will vary. We will probably stay in MI or the Great Lakes region however most of the time.
3. We may also wish to tow a small utility trailer, small boat but also a small vehicle.
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.
We realize we will get a variety of responses and opinions on this and that there isn't the perfect solution but we appreciate all you help as we have in the past.
Thanks!
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C. Boyd
76 Crestmont
East Tennessee
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