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Land Rover Gearbox Ratios

discovery r380 for saleOver the years there were a number of different gearboxes fitted to the various Land Rovers available. Each model of car had numerous variants also, which means that each gearbox had different ratios. Coupled with different Transfer box ratios and diffs there are a bucket load of different ratio available.

Here we will cover the Manual gearboxes fitted to Series, Defender, Discovery and Range Rover Models. We will cover main boxes and the transfer boxes also. Automatic Land Rover Gearbox Ratios are not covered. To help find what ratios your gearbox has you will need to find the Serial number stamped on the casing. 

Below are various tables listing the different ratios that were fitted to each gearbox.

Land Rover Series LT76 Gearbox Ratios

Main gearbox Suffix A & B Suffix C on Ser. III Ser. IIA & III
109 1-Ton
Fourth 1:1 1:1 1:1 1:1
Third 1.37:1 1.50:1 1.50:1 1.50:1
Second 2.04:1 2.22:1 2.22:1 2.22:1
First 3.00:1 3.60:1 3.68:1 3.60:1
Reverse 2.54:1 3.02:1 4.02:1 3.02:1

101 Forward Control, 109 Stage 1 V8 and Earlier Defender/Disco/Range Rover Gearboxes

Main gearbox LT95
109 Stage 1, 101, Range Rover thru ’83
V8 90/110 ’83 & ’84
LT85
All V8 90/110
’84-’91
LT77/LT77S
2.5L & 200 Tdi
’84 thru ’93
LT77/LT77S
V8 Discovery thru ’93
V8 90/110 ’92 & ’93
Fifth N/a 0.80:1 0.83:1 0.77:1
Fourth 1:1 1:1 1:1 1:1
Third 1.51:1 1.436:1 1.507:1 1.40:1
Second 2.45:1 2.18:1 2.30:1 2.13:1
First 4.07:1 3.65 3.59:1 3.32:1

R380 Gearbox

Main gearbox R380
All 300 Tdi Discovery & Defender
’94 to present
R380
All V8 Discovery & Defender
’94 to present
Fifth 0.77:1 0.73:1
Fourth 1:1 1:1
Third 1.30:1 1.39:1
Second 2.13:1 2.13:1
First 3.39:1 3.32:1

Series Transfer case Ratios:

Transfer case II, Suffix A & B
88 and 109
IIA suffix C on & III
88 and 109
109 1-Ton
IIA & III
High transfer 1.15:1 1.15:1 1.53:1
High transfer with 4.7 R&P 5.4:1 ( 3686 RPM @ 65mph*) 5.4:1 ( 3686 RPM @ 65mph*) 7.19:1 ( 4900 RPM @ 65mph*)
High transfer with 4.1 R&P 4.7:1 ( 3208 RPM @ 65mph*)  4.7:1 ( 3208 RPM @ 65mph*) 6.27:1 ( 4279 RPM @ 65mph*)
High transfer with 3.54 R&P 4.07:1 ( 2788 RPM @ 65mph*) 4.07:1 ( 2788 RPM @ 65mph*) 5.42:1 ( 3699 RPM @ 65mph*)
Low Transfer 2.89:1 2.35:1 3.27:1
Low transfer with 4.7 R&P 13.58:1 11.05:1 15.37:1
Low transfer with 4.1 R&P 11.85:1 9.64:1 13.41:1
Low transfer with 3.54 R&P 10.23:1 8.32:1 11.58:1

LT230 Transfer case Ratios

Transfer case
LT230
Early Range Rover V8 D 110
300 Tdi
V8 D90
Discovery
2.5L Ninety, One Ten
High transfer 1.00:1 1.41:1 1.22:1 1.67:1
high transfer with 3.54 R&P 3.54:1 ( 2416 RPM @ 65mph*) 4.99:1 ( 3406 RPM @ 65mph*) 4.32:1 ( 2948 RPM @ 65mph*) 5.84:1 ( 3986 RPM @ 65mph*)
high transfer with 4.1 R&P 4.1:1 ( 2798 RPM @ 65mph*) 5.78:1 ( 3945 RPM @ 65mph*) 5.00:1 ( 3414 RPM @ 65mph*) 6.85:1 ( 4675 RPM @ 65mph*)
high transfer with 4.7 R&P 4.7:1 ( 3208 RPM @ 65mph*) 6.63:1 ( 4525 RPM @ 65mph*) 5.73:1 ( 3911 RPM @ 65mph*) 7.85:1 ( 5358 RPM @ 65mph*)
Low Transfer 3.32:1 3.32:1 3.32:1 3.32:1
low transfer with 3.54 R&P 11.75      
low transfer with 4.1 R&P 13.62      
low transfer with 4.7 R&P 15.60:1

LT95 Transfer ratio ( Integral part of LT95 gearbox)

LT95 gearbox
transfer part
101 Forward Control 110 90, Range Rover
High transfer 1.17:1 1.34:1 1.11:1
Low Transfer 3.22:1 3.22:1 3.22:1

 

Thanks to expeditionlandrover.info for these tables.

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