LRDT Long Range Desert ToolsLRDT
Apply

Land Rover Series 109
II / IIA / III, 1958–85

Factory gearing, tires, angles and brakes for the Series 109, 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
109 in wheelbase · 28.4 in front · 37.6 in rear overhang
in
Axle ratio4.7Factory
Crawl ratio40.7:1Best trim: Series II / early IIA 109 (to ~1967, 2.888 low box) (7.50-16 tires)
Angles49 · ~22.1 · 24°Approach, breakover, departure (~ estimated)
Clearance8.25 inFactory figure
Highway mpg14Estimate, not EPA rated

Trims

3 we have figures for
TrimTireTransmissionAxleAnglesClearanceOpen
Series II / early IIA 109 (to ~1967, 2.888 low box) (7.50-16 tires)31.0Series II / early IIA 4-speed4.749 · ~22.1 · 248.2 inUse →
Series IIA 109 (suffix C on, ~1967-71) (7.50-16 tires)31.0Series IIA 4-speed4.749 · ~22.1 · 248.2 inUse →
Series III 109 (1971-85) (7.50-16 tires)31.0Series III all-synchro 4-speed4.749 · ~22.1 · 248.2 inUse →

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

Size

Wheelbase
109 in
Front overhang
28.4 in
Rear overhang
37.6 in
Height
77 in
Body
SUV
Stock tires
31.0

Transmissions and low range

Series II / early IIA 4-speed (suffix A/B, part synchro)
3 · 2.04 · 1.38 · 1
Series IIA 4-speed (suffix C on)
3.6 · 2.22 · 1.5 · 1
Series III all-synchro 4-speed
3.68 · 2.22 · 1.5 · 1
Low range, ser_early
2.888:1
Low range, ser_late
2.35:1

Axles

Front
Rover spiral bevel, enclosed CV front axle
Rear
Salisbury 8HA (most 109s; early ones Rover), fully floating
4.7 ratio
All trims
Ratios made for it
3.54

Brakes

Front
Drum
Rear drum
10.98 in, 279 mm
Rear
drum

Suspension

Front
solid axle on leaf springs
Rear
leaf springs, solid axle
Rear layout
Leaf springs

Fuel economy

Highway, not EPA rated
about 14 mpg
Where it comes from
Owner average, mixed driving (Series 2.25 petrol (thread on Series consumption; 109 not confirmed per post))
As published
17 L/100km
Source
aulro.com

Aftermarket bumpers

1 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 Series 109 sees how it does on their tires and lift.

Front 1

Rear

None listed yet.

Every calculator, set up for the Series 109

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 Series 109 ranks against every stock truck.See where it ranks

Source: auto-brochures.com. The Salisbury rear has its own crownwheel and pinion sets; a Rover-axle diff swap does not fit the Salisbury rear.

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.