Jeep Wrangler
YJ, 1987–95

Factory gearing, tires, angles and brakes for the Wrangler, 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

93.4 in wheelbase · 23.9 in front · 34.7 in rear overhang

Stock tireP215/75R1527.7 in tall

Axle ratio3.07–4.11Factory, by trim

Crawl ratio43.9:1Best trim: 2.5L four, P215/75R15

Angles30.77 · 24.64 · 31.5°Approach, breakover, departure

Clearance8.14 inFactory figure

Highway mpg16EPA, 19 with the manual

Tire upgrades, worked out

2.5L four, P215/75R15, 4.11s, from P215/75R15

Tire	Height	Under the diffs	Speedo at 65	RPM at 65	Gears for daily	Open
235/75R15	28.9 in	+0.6 in	62 mph	2,612	Keep 4.11s	Open →
31x10.50R15	31.0 in	+1.7 in	58 mph	2,433	4.56	Open →
32x11.50R15	32.0 in	+2.2 in	56 mph	2,357	4.88	Open →
33x10.50R15	33.0 in	+2.7 in	55 mph	2,286	4.88	Open →
33x12.50R15	33.0 in	+2.7 in	55 mph	2,286	4.88	Open →

Stock turns 2,723 rpm at 65 in top gear. Flotation sizes are nominal; most measure a little short mounted.

Trims

5 we have figures for

Trim	Tire	Transmission	Axle	Angles	Clearance	Open
2.5L four, P215/75R15	P215/75R15	Aisin AX-5 5-speed manual, Chrysler 30RH 3-speed automatic	4.11	30.77 · 24.64 · 31.5	8.1 in	Use →
4.2L six 1987-90, P215/75R15	P215/75R15	Peugeot BA10/5 5-speed manual, Aisin AX-15 5-speed manual, Chrysler 999 / 32RH 3-speed automatic	3.08 / 3.55	30.77 · 24.64 · 31.5	8.1 in	Use →
4.2L six 1987-90, optional P225/75R15	P225/75R15	Peugeot BA10/5 5-speed manual, Aisin AX-15 5-speed manual, Chrysler 999 / 32RH 3-speed automatic	3.08 / 3.55	30.77 · 24.64 · 31.5	8.1 in	Use →
4.0L six 1991-95, P215/75R15	P215/75R15	Aisin AX-15 5-speed manual, Chrysler 999 / 32RH 3-speed automatic	3.07 / 3.55	30.77 · 24.64 · 31.5	8.1 in	Use →
Renegade Decor Group (30x9.5R15)	30x9.50R15	Aisin AX-15 5-speed manual, Chrysler 999 / 32RH 3-speed automatic	3.07 / 3.55	30.77^* · 24.64 · 31.5	8.1 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.

Size

Wheelbase: 93.4 in
Front overhang: 23.9 in
Rear overhang: 34.7 in
Height: 70 in
Body: Short wheelbase SUV
Stock tires: 30x9.50R15, P215/75R15, P225/75R15

Transmissions and low range

Aisin AX-5 5-speed manual (2.5L): 3.93 · 2.33 · 1.45 · 1 · 0.84
Peugeot BA10/5 5-speed manual (4.2L, 1987-89): 4.03 · 2.39 · 1.52 · 1 · 0.72
Aisin AX-15 5-speed manual (6-cyl, 1989.5-95): 3.83 · 2.33 · 1.44 · 1 · 0.79
Chrysler 999 / 32RH 3-speed automatic (6-cyl): 2.74 · 1.55 · 1
Chrysler 30RH 3-speed automatic (2.5L, 1994-95): 2.74 · 1.54 · 1
Low range, np207: 2.6:1
Low range, np231: 2.72:1

Axles

Front: Dana 30 semi-floating, disconnect (7.125 in ring gear)
Rear: Dana 35C (7.563 in ring gear); Dana 44 optional some years
3.07 ratio: 4.0L six 1991-95, P215/75R15, Renegade Decor Group (30x9.5R15)
3.08 ratio: 4.2L six 1987-90, P215/75R15, 4.2L six 1987-90, optional P225/75R15
3.55 ratio: 4.2L six 1987-90, P215/75R15, 4.2L six 1987-90, optional P225/75R15, 4.0L six 1991-95, P215/75R15, Renegade Decor Group (30x9.5R15)
4.11 ratio: 2.5L four, P215/75R15

Brakes

Front rotor: 11.02 in, 280 mm
Front caliper piston: 66.0 mm
Rear drum: 9.00 in, 229 mm
Rear: drum (9 x 2.5 in)

Suspension

Front: solid axle on leaf springs with track bar
Rear: leaf springs with track bar
Rear layout: Leaf springs

Fuel economy

EPA highway, automatic: 16 mpg
EPA highway, manual: 19 mpg
Rated years: 1987–1995, 4WD

Brake upgrades

What bigger tires need →

DIY 15 in big brake kit (Durango / Grand Cherokee 330 mm calipers)+11% brake torque11.0 → 12.0 in rotor · 2-piston · 15 in wheels or bigger · $500approximate DIY cost from the write-up

Aftermarket bumpers

18 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 Wrangler sees how it does on their tires and lift.

Front 10

Body Armor 4x4 1987-2006 Jeep Wrangler YJ/TJ Front Bumper$644 · winch ready
Fishbone Offroad Front Winch Bumper with LED's for 1987-2006 Jeep Wrangler FB22016$530 · winch ready
Fishbone Offroad Piranha Front Bumper for 1976-1995 Jeep CJ/Wrangler FB22080$337
Motobilt Crusher Front Bumper for Jeep YJ / TJ /LJ50 lb · $549 · winch ready
Next Venture Motorsports TJ/LJ/YJ High Clearance Hitch Bumper$540
Rugged Ridge Front Tube Winch Bumper (76-06 CJ, YJ, TJ)$520 · winch ready
Rusty's Off-Road Rusty's Bumper - Trail Front - YJ Wrangler$582
Smittybilt 76740D Classic Front Bumper with D-Ring Mounts$200
Throttle Down Kustoms Vortex Front Bumper (YJ)$1,675 · winch ready
Warrior Products Warrior 570 Jeep Wrangler YJ & TJ 1976-2006 Rock Crawler Front Bumper$495 · winch ready

Rear 8

Every calculator, set up for the Wrangler

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 Wrangler ranks against every stock truck.See where it ranks

Source: images-stag.jazelc.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.

Jeep WranglerYJ, 1987–95