Gear ratio

[sampsmit000]

I am looking into buying a 1/2 1500 gmc sierra. What would the gear ratio be on this? The vin is TKL146F743510 if that helps at all. Thanks!

[barry1982]

Hi there, you would be better off getting the RPO code from the sticker in your glove box. Do a google search with that, and you should be able to find your factory ratio...... providing no one has changed the diff at some point...

[Keith Seymore]

Need a bit more detail: engine, trans, GVW more than likely.

If the truck was equipped with the base axle ratio then the SPID will show RPO "GQ1" and won't tell you what it is.

If it has an optional ratio then it will have the RPO and the name (ie, GU6 = 3.42; GT4 = 3.73).

K

[McSwine]

Originally Posted by barry1982

Hi there, you would be better off getting the RPO code from the sticker in your glove box. Do a google search with that, and you should be able to find your factory ratio...... providing no one has changed the diff at some point...

Does anyone know how to go about getting a replacement for the glovebox RPO sticker (well, not the sticker itself, just the info on it)?

[Keith Seymore]

Originally Posted by McSwine

Does anyone know how to go about getting a replacement for the glovebox RPO sticker (well, not the sticker itself, just the info on it)?

For 1976 and later (US built) you can send your VIN and $50 to the GM Heritage Center archive and they will send you the original invoice, complete with RPO content and pricing.

http://www.gmmediaarchive.com/?page=1

If your truck was built in Canada, or built in the US for Canadian sale, then GM of Canada will have your information:

http://www.vintagevehicleservices.com/options.html

Once you have all of the technical detail then forum member Chipflyer can reproduce the SPID label itself.

K

[McSwine]

Originally Posted by Keith Seymore

For 1976 and later (US built) you can send your VIN and $50 to the GM Heritage Center archive and they will send you the original invoice, complete with RPO content and pricing.

http://www.gmmediaarchive.com/?page=1

If your truck was built in Canada, or built in the US for Canadian sale, then GM of Canada will have your information:

http://www.vintagevehicleservices.com/options.html

Once you have all of the technical detail then forum member Chipflyer can reproduce the SPID label itself.

K

Awesome, thank you so much.

[onekarnut]

Keith Seymore
As you said the base axle code is GQ1 on my 84 swb Silverado that came with a 305 and a 700r4 what would be the most likely ratio be? Sorry sampsmit000 not trying to hi-jack your post.
Thanks Keith.

[Keith Seymore]

In the spirit of not hijacking 2.73 was the base axle for an '84 1/2 ton swb with a 305 and 700R4.

Here is the generic info packet from the GM Heritage Center archive for your reference:

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

K