Ford Bronco II
1984–88
Factory gearing, tires, angles and brakes for the Bronco II, 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.
Tire upgrades, worked out
1984 2.8 V6, 4-speed or C5 auto, 3.45s, from P195/75R15| Tire | Height | Under the diffs | Speedo at 65 | RPM at 65 | Gears for daily | Open |
|---|---|---|---|---|---|---|
| 235/75R15 | 28.9 in | +1.2 in | 60 mph | 2,193 | 3.73 | Open → |
| 31x10.50R15 | 31.0 in | +2.2 in | 56 mph | 2,043 | 4.1 | Open → |
| 32x11.50R15 | 32.0 in | +2.7 in | 54 mph | 1,979 | 4.1 | Open → |
| 33x10.50R15 | 33.0 in | +3.2 in | 52 mph | 1,919 | 4.56 | Open → |
| 33x12.50R15 | 33.0 in | +3.2 in | 52 mph | 1,919 | 4.56 | Open → |
Stock turns 2,388 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 |
|---|---|---|---|---|---|---|
| 1984 2.8 V6, 4-speed or C5 auto | P195/75R15 | 5-speed overdrive manual, 5-speed overdrive manual, 4-speed automatic overdrive | 3.45 / 3.73 | 29.5 · 25.1 · 24.8 | 6.5 in | Use → |
| 1985-88 2.8/2.9 V6, 5-speed or A4LD | P195/75R15 | 5-speed overdrive manual, 5-speed overdrive manual, 4-speed automatic overdrive | 3.45 / 3.73 / 4.1 | 29.3 · 24.1 · 24.7 | 6.3 in | Use → |
| Eddie Bauer / XLT option P205/75R15 RWL | P205/75R15 | 5-speed overdrive manual, 5-speed overdrive manual, 4-speed automatic overdrive | 3.45 / 3.73 / 4.1 | 29.3 · 24.1 · 24.7 | 9.3 in | Use → |
Size
- Wheelbase
- 94 in
- Front overhang
- 28.2 in
- Rear overhang
- 36 in
- Height
- 68 in
- Body
- Short wheelbase SUV
- Stock tires
- P195/75R15, P205/75R15
Transmissions and low range
- 5-speed overdrive manual (Toyo Kogyo/Mazda TK5)
- 3.96 · 2.08 · 1.39 · 1 · 0.84
- 5-speed overdrive manual (Mitsubishi FM145/FM146)
- 3.769 · 2.21 · 1.516 · 1 · 0.81
- 4-speed automatic overdrive (A4LD), from Nov 1984
- 2.47 · 1.47 · 1 · 0.75
Axles
- Front
- Dana 28 Twin Traction Beam
- Rear
- Ford 7.5 in
- 3.45 ratio
- 1984 2.8 V6, 4-speed or C5 auto, 1985-88 2.8/2.9 V6, 5-speed or A4LD, Eddie Bauer / XLT option P205/75R15 RWL
- 3.73 ratio
- 1984 2.8 V6, 4-speed or C5 auto, 1985-88 2.8/2.9 V6, 5-speed or A4LD, Eddie Bauer / XLT option P205/75R15 RWL
- 4.1 ratio
- 1985-88 2.8/2.9 V6, 5-speed or A4LD, Eddie Bauer / XLT option P205/75R15 RWL
- Ratios made for it
- 3.73 · 4.1 · 4.56
Brakes
- Front rotor
- 10.87 in, 276 mm
- Front caliper piston
- 66.0 mm
- Rear drum
- 9.00 in, 229 mm
- Rear
- drum
Suspension
- Front
- Twin Traction Beam, radius arms, coil springs
- Rear
- leaf springs, solid axle
- Rear layout
- Leaf springs
Fuel economy
- EPA highway, automatic
- 20 mpg
- EPA highway, manual
- 20 mpg
- Rated years
- 1984–1988, 4WD
Every calculator, set up for the Bronco II
Source: therangerstation.com. The Dana 28 TTB front has very limited ring-and-pinion availability, which is why many owners swap to a Dana 35 TTB or solid axle when going past 4.10.
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.