An available navigation system tops 2005 additions to Chevrolet's large SUVs. Tahoes are cousins of the GMC Yukon and Yukon Denali; the longer Suburbans are kin to Yukon XL/Denali XL. Tahoes come as half-ton 1500s, Suburbans in 1500 and heavy-duty 2500 models. All offer LS, upscale LT, and off-road-oriented Z71 trim and a liftgate with opening glass; swing-out rear cargo doors are dropped. A 3rd-row bench seat is standard for Suburbans, optional on Tahoes for up to 9-passenger capacity; 2nd-row buckets are available with the LT or Z71 package. Front side airbags are optional. Head-protecting curtain side airbags are unavailable.

All models have antilock 4-wheel disc brakes, automatic transmission, and a V8 engine. Tahoes come with a 4.8-liter and offer a 5.3 that's standard on Suburban 1500s. Suburban 2500s use a 6.0 or optional 8.1-liter. All models offer rear-wheel drive or GM's all-surface Autotrac 4WD with low-range gearing. Suburban 2500s with 2WD and 6.0 V8 have traction control. GM's Stabilitrak antiskid system became standard for all Tahoe and 1500 models during the '05 model year; it is not available on 2500s. GM's Quadrasteer 4-wheel steering is available for 6.0-liter Suburban 2500s. Quadrasteer reduces turning radius at low speeds and is designed to enhance stability at higher speeds and when towing.

The navigation system is optional for all but LS models. It includes a touch screen integrated with a new audio head unit. GM's OnStar assistance is standard. Also, the Z71 off-road package is extended from 4WDs to 2WDs; it features unique wheel flares, body trim, and special shock absorbers, plus 17-inch wheels in place of 16s. Rear DVD entertainment, satellite radio, and load-leveling rear suspension are optional. Power-adjustable pedals are available for LS models, standard otherwise.