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Old 01-16-2018, 10:33 PM   #1
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Rear axle ratio vs, weight ratings?

Looking at a vin decoder for my Chevy 1500, the specs give me a range of figures. For instance:
WD hitch max tongue weight 1050, 1200 lbs - 750 min, 1200 max
Gross combined weight rating 12000, 13000 lbs. - 10000 min, 15500 max.
It appears the variable that determines the actual rating is the axle ratio.
Axle ratio 3.23, 3.42, 3.73 :1

Is my assumption correct?

How can I determine what the actual axle ratio on my truck is?

I do not have the orig manual, bought used, the best info I have so far is the VIN decoder info as listed.

Does the lower axle ratio give the higher weight capacity?

My estimates tell me, fully loaded, I will be under the smaller of the limits with a tongue weight of 640 lbs. and a Gross combined weight of 9866 lbs.
I plan on stopping at a scale to confirm before heading out in spring.
I would just like to be able to determine the actual capacity of my truck.
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Old 01-17-2018, 12:52 AM   #2
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Look in glove box for RPO Codes (regular production options)

Then check against info posted in LINK
C5/C6 will be GVWR
GT/GU will be axle ratio

http://www.chevyavalanchefanclub.com...?topic=96887.0
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Old 01-17-2018, 08:57 AM   #3
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On most vehicles there is a Federal Certification Label in the door frame, It includes VIN, GVWR, GAWRs, tire size and PSI, and several codes for paint, axle, etc. The axle code would translate to tell you exactly what you have. My axles code translates to 3.10 ratio with electronic locking differential. Your axle code should translate to the gear ratio as well as whether the differential is open, Positraction, or electronic locking.
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Old 01-17-2018, 02:56 PM   #4
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Quote:
Originally Posted by Old-Biscuit View Post
Look in glove box for RPO Codes (regular production options)

Then check against info posted in LINK
C5/C6 will be GVWR
GT/GU will be axle ratio

http://www.chevyavalanchefanclub.com...?topic=96887.0
Thanks Old Biscuit, very helpful, I found the RPO codes, had no idea what they all meant, looked up the site and found most of the code descriptions.
Learned my truck has an axle ratio of 3.42:1 and a lot more info about my truck.
Can you tell me how the axle ratio corresponds to weight rating?
It looks like because the 3.42 axle is first in line as is the heavier weight rating that the heavier rating would apply?

Wt Distributing Hitch - Max Trailer Wt. 8000, 7000 lbs 5000.0 min 8000.0 max
Wt Distributing Hitch - Max Tongue Wt. 1200, 1050 lbs 750.0 min 1200.0 max

Axle Ratio (:1) - Rear 3.42, 3.73, 3.23 3.23 min 3.73 max
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Old 01-19-2018, 07:22 AM   #5
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Quote:
Originally Posted by RHD51 View Post
Thanks Old Biscuit, very helpful, I found the RPO codes, had no idea what they all meant, looked up the site and found most of the code descriptions.
Learned my truck has an axle ratio of 3.42:1 and a lot more info about my truck.
Can you tell me how the axle ratio corresponds to weight rating?
It looks like because the 3.42 axle is first in line as is the heavier weight rating that the heavier rating would apply?

Wt Distributing Hitch - Max Trailer Wt. 8000, 7000 lbs 5000.0 min 8000.0 max
Wt Distributing Hitch - Max Tongue Wt. 1200, 1050 lbs 750.0 min 1200.0 max

Axle Ratio (:1) - Rear 3.42, 3.73, 3.23 3.23 min 3.73 max
the 3.73 would pull the most, with the 3.42 in the middle.
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Old 01-19-2018, 07:37 AM   #6
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You can craw under your truck and look for a small metal tag on the differential. It should tell you the gear ratio
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