Gear ratio

[99Sierra2500]

Let's see the truck, post an intro

 

[JorgeS]

Having had a 2001 Suburban with 4.10 and now a 2005 Yukon with 3.43, I think I agree with you.
The Suburban, with ~500 lbs more mass, was way quicker off the line. I think the Yukon will pass vehicles better at speed, probably because it can stay in gear longer, has more HP, and less weight. The drive-by-wire may have some effect as well off-the-line.
What disappointed me is that I saw about the same MPG from the Suburban as I get from the Yukon.
I may look into re-gearing.

 

[Marky Dissod]

Put 4.10 axle assemblies on your '05 Yukon (likely cheaper than regearing the axles internally).
From having tuned many LT1 B- & D-sedans & wagons with 2.56, 2.93, 3.08, & 3.42 (& 3.73 for the more enthusiastic enthusiasts, 4.10 for a few hardcores),
3.42 & 3.73 were the axle gears that made most Caprice/RoadMaster/Fleetwood owners happy.
Once you account for the offset of 27"-28" tires on those smaller/ligther sedans/wagons vs 31.6" tires for our suvs
you'll understand why I recommend 3.73 or 4.10 for most GMT800 vehicles (4.30 for taller & heavier wheel&tire combos).

 

[AuroraGirl]

Put 4.10 axle assemblies on your '05 Yukon (likely cheaper than regearing the axles internally).
From having tuned many LT1 B- & D-sedans & wagons with 2.56, 2.93, 3.08, & 3.42 (& 3.73 for the more enthusiastic enthusiasts, 4.10 for a few hardcores),
3.42 & 3.73 were the axle gears that made most Caprice/RoadMaster/Fleetwood owners happy.
Once you account for the offset of 27"-28" tires on those smaller/ligther sedans/wagons vs 31.6" tires for our suvs
you'll understand why I recommend 3.73 or 4.10 for most GMT800 vehicles (4.30 for taller & heavier wheel&tire combos).

No C bodies or C body wagons?

 

[Marky Dissod]

No C body sedans or wagons?

'fraid not, those never had mid-90s LT1s in them.