Are there different rear diff or transmission gear ratios with different model years?

[wjburken]

I dont believe that sheet is in my glove box.

Where else can i look to find this?

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It looks like this:

 

[swathdiver]

I dont believe that sheet is in my glove box.

Where else can i look to find this?

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If missing you can send an email to GM with your VIN and they will send a reply with all of the codes and what they mean. Conversely, there's a company that let's you get 5 VIN checks for $5 but the name escapes me at the moment. Fellas, do you remember the one?

 

[Bob2C]

My 02 Yukon had 4.10 rear. Took off fast. 17 years later my brother still has the truck. Needs a paint job but mechanically sound.


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[Woodblocker55]

I have a 5.3 L 4:10 it's a stop light launcher . You need to becareful with G80 posi . The rear will brake loose pretty easy ya both wheels and slide to the side at launch . And yes rigs with 4:10 seem to last longer this reason I think it 200 rpm more keep the bands tight in tranny that's my opinion . But on other hand 4:10 people do abusing them more.
Because I drove mine about 5000 miles I will always want 4:10 gears . Now next crop after 2006 they have more gears that adds more stuff going on . More gears In tranny will compensate for Towing so you don't need the low gear rear end tranny does it for ya . Well see how that holds up .
More stress in tranny isnt really ideal to me but I'm old school I can only guess tranny's run hotter .
And tranny's are week point anyway . But thats the GTM900 guys can address [emoji106]

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[swathdiver]

I have a 5.3 L 4:10 it's a stop light launcher . You need to becareful with G80 posi . The rear will brake loose pretty easy ya both wheels and slide to the side at launch . And yes rigs with 4:10 seem to last longer this reason I think it 200 rpm more keep the bands tight in tranny that's my opinion . But on other hand 4:10 people do abusing them more.
Because I drove mine about 5000 miles I will always want 4:10 gears . Now next crop after 2006 they have more gears that adds more stuff going on . More gears In tranny will compensate for Towing so you don't need the low gear rear end tranny does it for ya . Well see how that holds up .
More stress in tranny isnt really ideal to me but I'm old school I can only guess tranny's run hotter .
And tranny's are week point anyway . But thats the GTM900 guys can address [emoji106]

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That's right Joe, good combination. Of course in 3rd gear a GMT800 with the 4-speed and 4.10s has a final drive of 4.10:1 and running a 265-70-17 tire would be turning 2600 rpms @ 60 mph.

4th gear in a GMT900 with the 6-speed and 3.42 gears is a 3.94:1 final drive running the same tire is turning 2500 rpms @ 60 mph.

4th gear in a GMT900 with the 6-speed and 3.73 gears is a 4.30:1 final drive running the same tire is turning 2750 rpms @ 60 mph.