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Chevrolet Silverado 1500
GMT800, 1999–2006

Factory gearing, tires, angles and brakes for the Silverado 1500, and what the usual upgrades do to it. Every number is from the maker's own figures unless the calculators say otherwise. A few figures here are still waiting on a factory document; the calculators mark them.

Use this truck in the calculators
143.5 in wheelbase · 37 in front · 41.3 in rear overhang
in
Stock tireP245/75R1630.5 in tall
Axle ratio3.42–3.73Factory, by trim
Crawl ratio40.8:1Best trim: LS/LT 4x4
Angles23 · 19 · 23°Approach, breakover, departure
Clearance9 inFactory figure
Highway mpg17EPA

Tire upgrades, worked out

LS/LT 4x4, 3.42s, from P245/75R16
TireHeightUnder the diffsSpeedo at 65RPM at 65Gears for dailyOpen
265/75R1631.6 in+0.6 in63 mph1,643Keep 3.42sOpen →
285/75R1632.8 in+1.2 in60 mph1,5843.73Open →
33x10.50R1633.0 in+1.3 in60 mph1,5763.73Open →
255/85R1633.1 in+1.3 in60 mph1,5733.73Open →
315/75R1634.6 in+2.1 in57 mph1,5034.1Open →
35x12.50R1635.0 in+2.3 in57 mph1,4864.1Open →

Stock turns 1,707 rpm at 65 in top gear. Flotation sizes are nominal; most measure a little short mounted.

Trims

2 we have figures for
TrimTireTransmissionAxleAnglesClearanceOpen
LS/LT 4x4P245/75R16Hydra-matic 4L60-E 4-speed automatic, NV3500 5-speed manual, full-size wide ratio3.42 / 3.7323 · 19 · 239.0 inUse →
Z71 Off-Road PackageP265/75R16Hydra-matic 4L60-E 4-speed automatic, NV3500 5-speed manual, full-size wide ratio3.42 / 3.7324 · 20 · 239.0 inUse →

Size

Wheelbase
143.5 in
Front overhang
37 in
Rear overhang
41.3 in
Height
76 in
Body
Pickup
Stock tires
P245/75R16, P265/75R16

Transmissions and low range

Hydra-matic 4L60-E 4-speed automatic
3.059 · 1.625 · 1 · 0.696
NV3500 5-speed manual, full-size wide ratio
4.02 · 2.32 · 1.4 · 1 · 0.73
Low range, np246
2.72:1
Low range, nv263
2.72:1

Axles

Front
GM 8.25 in IFS
Rear
GM 8.6 in 10-bolt (8.5 in on early 4.3/4.8 trucks)
3.42 ratio
LS/LT 4x4, Z71 Off-Road Package
3.73 ratio
LS/LT 4x4, Z71 Off-Road Package
Ratios made for it
3.73 · 4.1 · 4.56 · 4.88

Brakes

Front rotor
12.00 in, 305 mm
Front caliper piston
51.0 mm
Rear rotor
12.80 in, 325 mm
Rear
disc (vented, 325 x 20 mm)

Suspension

Front
double wishbone IFS (torsion bars through 2006, coilovers after)
Rear
leaf springs, solid axle
Rear layout
Leaf springs

Fuel economy

EPA highway, automatic
17 mpg
EPA highway, manual
17 mpg
Rated years
1999–2006, 4WD

Frame

Rail top at the rear axle
31.5 in off the ground
Measured on
P265/70R17

Brake upgrades

What bigger tires need →

Aftermarket bumpers

11 listed

Makers almost never publish angles, bottom heights or how far a bumper tucks, so these fill in as owners measure them. Measured yours? Add it on the rig page and every owner of this Silverado 1500 sees how it does on their tires and lift.

Front 7

Rear 4

Every calculator, set up for the Silverado 1500

Tire sizeBigger tires: speedo, clearance, angles and brakes.Compare tiresRegearHighway RPM on every ratio and mpg.Pick your gearsCrawl ratioHow slow it creeps, against other trucks.Work out crawlSpeedometerWhat it really reads on new tires.Fix your speedoLinksAnti-squat and what a lift does to it.Check your linksYour rigBuild sheet and measured angles.Start a build sheetLeaderboardsWhere the Silverado 1500 ranks against every stock truck.See where it ranks

Source: auto-brochures.com.

Use at your own risk. These calculators are here to help you plan and to inform your decisions, not to sign off on a build. Many numbers are estimates worked out from factory figures, and some factory figures are not yet confirmed. Check every number against your own truck, its manuals and a qualified shop before you buy parts, cut, weld, lift, regear or drive on it. Long Range Desert Tools is not liable for anything you do based on these calculators or their results. The full terms are in our policies.