| [GMCnet] Final Drive Ratios [message #358042] |
Tue, 25 August 2020 13:31  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Looking at GMC Manual X7425, page 0-2, for another reason, I came across
information I didn't know was available: The Final Drive ratio is stamped
on the flange near the right (passenger) side case expansion hole (the Big
one) of the FD. There should be a 3 or 4 character code, with the first
letter "T" (3.07:1 ratio), followed by "A"=January thru "K"=December ("I"
not used), and the date of manufacture during that month. EX: TA12 means a
3.07 made on January 12th.
BIG Q for Jim K.: Do Y'All obliterate that code when changing the ratio?
If not, no one should depend on it being accurate.
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Final Drive Ratios [message #358055 is a reply to message #358042] |
Tue, 25 August 2020 19:55  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Ken, We have seen some but not that consistant.
We stamp on the machined surace where the cover is and mark 3.5 , 3.7, or
4.1 also LSD
Were the only one that do the ID .
On Tue, Aug 25, 2020 at 11:32 AM Ken Henderson via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Looking at GMC Manual X7425, page 0-2, for another reason, I came across
> information I didn't know was available: The Final Drive ratio is stamped
> on the flange near the right (passenger) side case expansion hole (the Big
> one) of the FD. There should be a 3 or 4 character code, with the first
> letter "T" (3.07:1 ratio), followed by "A"=January thru "K"=December ("I"
> not used), and the date of manufacture during that month. EX: TA12 means a
> 3.07 made on January 12th.
>
> BIG Q for Jim K.: Do Y'All obliterate that code when changing the ratio?
> If not, no one should depend on it being accurate.
>
> Ken H.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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