There should be a sticker inside the driver door jamb that shows the
trailer capacity of your specific truck. That sticker (if it is still
there) is specific to your VIN, so if it is missing you MIGHT be able to
get a dealer to look up all the pertinent information. The RPO codes in
the glove box SHOULD tell you your axle ratio, but you have to find the
decoder specific to your year. Of course the low tech solution is to lift
the rear end and see how many turns of the prop shaft are required to get
one revolution of the rear wheels.
On Sun, Apr 12, 2015 at 2:46 PM, Dave Cavanaugh <cavanadd@frontier.com>
wrote:
> I have a 2004 GMC Sierra extended cab, short bed. I would like to find
> the axle ratio and engine size. I am pretty sure the engine is a 5.3
> Vortec, but I'm having trouble finding the axle ratio. None of the codes in
> the glove box match anything I read on line. Any pointers? I will need to
> be towing a trailer quite a bit in the future and need to know how heavy I
> can go.
>
> Thanks
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