Chevrolet Silverado 2500HD
2011–19

Factory gearing, tires, angles and brakes for the Silverado 2500HD, 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

153.7 in wheelbase · 39.4 in front · 42.5 in rear overhang

Stock tireLT245/75R1731.5 in tall

Axle ratio3.73–4.1Factory, by trim

Crawl ratio44.9:1Best trim: WT 4x4, 6.0 gas

Angles22.3 · ~15.7 · 22.4°Approach, breakover, departure (~ estimated)

Clearance8.2 inFactory figure

Highway mpg11Estimate, not EPA rated

Tire upgrades, worked out

WT 4x4, 6.0 gas, 4.1s, from LT245/75R17

Tire	Height	Under the diffs	Speedo at 65	RPM at 65	Gears for daily	Open
285/70R17	32.7 in	+0.6 in	63 mph	1,835	Keep 4.1s	Open →
33x10.50R17	33.0 in	+0.8 in	62 mph	1,819	Keep 4.1s	Open →
33x12.50R17	33.0 in	+0.8 in	62 mph	1,819	Keep 4.1s	Open →
255/80R17	33.1 in	+0.8 in	62 mph	1,815	4.56	Open →
285/75R17	33.8 in	+1.2 in	60 mph	1,774	4.56	Open →
315/70R17	34.4 in	+1.4 in	60 mph	1,747	4.56	Open →
35x11.50R17	35.0 in	+1.8 in	58 mph	1,715	4.56	Open →
35x12.50R17	35.0 in	+1.8 in	58 mph	1,715	4.56	Open →
37x11.50R17	37.0 in	+2.8 in	55 mph	1,622	4.88	Open →
37x12.50R17	37.0 in	+2.8 in	55 mph	1,622	4.88	Open →

Stock turns 1,907 rpm at 65 in top gear. Flotation sizes are nominal; most measure a little short mounted.

Trims

3 we have figures for

Trim	Tire	Transmission	Axle	Angles	Clearance	Open
WT 4x4, 6.0 gas	LT245/75R17	Hydra-matic 6L90 6-speed automatic	4.1	22.3 · ~15.7 · 22.4	8.2 in	Use →
LT / Z71 4x4, Duramax	LT265/70R17	Allison 1000 6-speed automatic	3.73	22.3^* · ~15.7 · 22.4^*	8.2 in	Use →
LTZ / High Country 4x4	LT265/60R20	Hydra-matic 6L90 6-speed automatic, Allison 1000 6-speed automatic	3.73 / 4.1	22.3^* · ~15.7 · 22.4^*	8.2 in	Use →

* The maker doesn’t publish this figure for that trim, so it shows the closest trim’s (same tire where we have one), or a close relative’s that shares the same body or front end. Hover the star to see which.

~ Estimated from the wheelbase and ground clearance. No maker has published it for this truck yet.

Size

Wheelbase: 153.7 in
Front overhang: 39.4 in
Rear overhang: 42.5 in
Height: 76 in
Body: Pickup
Stock tires: LT245/75R17, LT265/60R20, LT265/70R17

Transmissions and low range

Hydra-matic 6L90 6-speed automatic (HD): 4.03 · 2.36 · 1.53 · 1.15 · 0.85 · 0.67
Allison 1000 6-speed automatic (2006+): 3.1 · 1.81 · 1.41 · 1 · 0.71 · 0.61
Low range, autotrac-hd: 2.72:1

Axles

Front: AAM 9.25 in IFS
Rear: AAM 11.5 in full-float
3.73 ratio: LT / Z71 4x4, Duramax, LTZ / High Country 4x4
4.1 ratio: WT 4x4, 6.0 gas, LTZ / High Country 4x4
Ratios made for it: 4.1 · 4.56 · 4.88

Brakes

Front rotor: 13.98 in, 355 mm
Front caliper piston: 60.0 mm
Rear rotor: 14.17 in, 360 mm
Rear: disc (vented, 360 x 34 mm)

Suspension

Front: double wishbone IFS, torsion bars
Rear: multi-leaf springs, solid axle
Rear layout: Leaf springs

Fuel economy

Highway, not EPA rated: about 11 mpg
Where it comes from: Owner average, mixed driving (2015 Silverado 2500HD Double Cab 4x4 6.0 gas 6L90)
Source: tractorbynet.com

Aftermarket bumpers

12 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 2500HD sees how it does on their tires and lift.

Front 8

Rear 4

Every calculator, set up for the Silverado 2500HD

Tire sizeBigger tires: speedo, clearance, angles and brakes.Compare tires RegearHighway RPM on every ratio and mpg.Pick your gears Crawl ratioHow slow it creeps, against other trucks.Work out crawl SpeedometerWhat it really reads on new tires.Fix your speedo LinksAnti-squat and what a lift does to it.Check your links Your rigBuild sheet and measured angles.Start a build sheet LeaderboardsWhere the Silverado 2500HD ranks against every stock truck.See where it ranks

Source: auto-brochures.com. AAM 11.5 uses different carriers for 3.73-and-down vs 4.10-and-up.

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.

Chevrolet Silverado 2500HD2011–19