| [GMCnet] Final Drive Ratios [message #358042] |
Tue, 25 August 2020 13:31  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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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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