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This page has been set up as a reference source for gear sets that have been
used in Land Rover gearboxes. Data has come from a variety of sources.
It has not necessarily been cross checked and verified, so use the information
with the appropriate amount of discretion. In other words don't blame me
if the gears you get don't fit.
Manual Gearboxes | Automatic Gearboxes | Transfer Gearbox |
LT77/LT77S | ZF4HP22 | LT230 |
R380 | LT95 (Transfer Case Section) | |
LT85 | ||
LT95 | ||
Series Gearboxes |
Gear | Ratio | Models Used | Box S/N |
1st | 3.321 | Disco V8 | |
3.585 | 90/110 | 50A, 56A, 60A, 61A | |
3.692 | Disco 200 TDI | ||
2nd | 2.132 | Disco | |
2.3008 | 90/110 | 50A, 56A, 60A, 61A | |
3rd | 1.397 | Disco | |
1.5074 | 90/110 | 50A, 56A, 60A, 61A | |
4th | 1.00 | All | All |
5th | 0.77 | Disco | |
0.8314 | 90/110 | 50A, 56A, 60A, 61A | |
Reverse | 3.429 | Disco | |
3.7007 | 90/110 | 50A, 56A, 60A, 61A |
The LT77 gearbox was used from 1983 to 1989 on 90/110s with 4 cylinder engines and 1990/91 on all 90/110s. LT77S were used all all Discoverys to 1993 and 90/110s during 1992/93. All of these boxes use a separate transfer case called the LT230 which is mounted directly onto the output flange of the gearbox. The "77" refers to the centerline spacing in mm between the mainshaft and the layshaft. Reverse is to the left and up.
Gear | Ratio | Models Used | Box S/N |
1st | 3.32 | Disco V8i | |
3.39 | Disco 300TDI | ||
2nd | 2.13 | Disco | |
3rd | 1.39 | Disco V8i | |
1.30 | Disco 300TDI | ||
4th | 1.00 | All | |
5th | 0.73 | Disco V8i | |
0.77 | Disco 300TDI | ||
Reverse | 3.43 | Disco |
The R380 gearbox was used from 1994 to present on Defenders and Discoverys. All of these boxes use a separate transfer case called the LT230 which is mounted directly onto the output flange of the gearbox. Reverse is to the right and down. This box was brought in as a replacement for the LT77S. It is noted to be smoother shifting than its predecessor.
Gear | Ratio | Models Used |
1st | 3.6497 | 90/110 |
2nd | 2.1804 | 90/110 |
3rd | 1.4362 | 90/110 |
4th | 1.00 | All |
5th | 0.7951 | 90/110 |
Reverse | 3.8242 | 90/110 |
The LT85 gearbox was used from 1984 to 1991 on 90/110s with V8s and 1986 on for Isuzu diesels. All of these boxes use a separate transfer case called the LT230 which is mounted directly onto the output flange of the gearbox. This is normally referred to as the "Santana" gearbox as it was used on Santana Land Rovers.
Gear | Ratio | Models Used |
1st | 4.0691 | All |
2nd | 2.4480 | All |
3rd | 1.5049 | All |
4th | 1.00 | All |
Reverse | 3.6643 | All |
The LT95 gearbox was used from 1969 to 1983 on Range Rovers, all 101s, Stage Is and 90/110s with V8s in 1983/84 and 1985 with Isuzu diesels. All of these boxes use an integral transfer case. The transfer case is a "full time" units with a lockable, mechanical differential. The differential is locked via a vacuum actuator. Overdrives are available that mount off of the PTO flange and replace the transfer case input gear. Note that the gearbox and transfer case use separate sumps. See the transfer case section for information on transfer case ratios.
Gear | Ratio | Models Used |
1st | 3.00 | Series I, II, IIA |
3.60 | IIA 109, 6 cylinder and '1 ton' | |
3.68 | III | |
2nd | 2.043 | Series I, II |
2.22 | IIA 109, 6 cylinder and '1 ton', III | |
3rd | 1.50 | Series I, IIA 109, 6cyl, 1 ton, III |
1.38 | Series II | |
4th | 1.00 | All |
Reverse | 2.547 | Series I |
3.02 | IIA 109, 6 cylinder and '1 ton' | |
4.01 | III | |
High Range | 1.148 | I, II, IIA, III |
1.53 | IIA 109, 6 cylinder, 109FC and 1 ton | |
Low Range | 2.89 | I, II, IIA |
2.35 | IIA 109 6 cylinder, III | |
3.27 | 1 ton | |
2.92 | 109FC |
Gear | Ratio | Models Used |
1st | 2.48 | All |
2nd | 1.48 | All |
3rd | 1.00 | All |
4th | 0.728 | All |
Reverse | 2.086 | All |
Gearbox S.No. | Ratio | Tooth Count in/int/int/out |
Models Used and Comments | |
20D | 1.667 | 2.5 NAS 110 | ||
22D | 1.410 | ALL 90/110 4cyl | ||
25D | 1.410 | V8 110 LT85 | ||
26D | 1.003 | RR CLASSIC 3speed auto (TF727) | ||
27D | 1.192 | early RR Classic | ||
28D | 1.222 | 26/41/19/40 | RR, Disco I, LT77, LT77S, LT85, R380 (Discovery 200tdi) | Low Range 3.321 |
29D | 1.192 | 90 V8s with LT85 gearboxes | ||
32D, 34D | 1.222 | 2.0 Disco I | ||
36D, 38D, 40D, | 1.211 | NAS 90 & Disco | ||
41D 42D | 1.211 | Disco II diff lock stud | ||
43D 57D | 1.410 | 90/110 td5 | ||
61D, 62D, 68D, 69D, 70D | 1.410 | Disco II - NO diff lock | ||
OverDrive | 0.74? | Tim Payne Overdrive Designs Ltd Total t. case ratio is multiplied times the existing transfer case ratio. i.e. 0.9028 = 0.74 * 1.22 high/high | ||
Underdrive | 2.690 | Ashcroft Transmissions Ltd,
Total t. case ratio is multiplied times the existing transfer case
ratio. i.e. 8.933 = 2.69 * 3.321 low/low http://www.autoconv.com/crawler.htm |
The LT230 is an all gear transfer case. It has been used on all
Defenders, Discoverys, pre' 1989 Range Rovers and 90/110s with
LT77/LT77S/LT85/R380/ZF4HP22 gearboxes. The transfer case is a "full
time" unit with a lockable, mechanical differential. The differential
is locked via a mechanical linkage through a spring inside the box.
Overdrives and underdrives are available that mount off of the PTO flange and
replace the transfer case input gear. The gear set is comprised of 4
pieces:
LT230
Gear Set
LT230 Gear Part Numbers
Input gear bearings | FRC 5564 | |||
Box S/N | Input gear Part No. /teeth | Intermediate, low/drive/high |
Low | High |
GENERAL | Suffix A or B use a FRC5428 Up to 461123E use a FTC5089 From 461124F to 551442F use a FTC5087 From 551443G use IEH500010 200 Tdi Disco & Defender & 300 Tdi defender USE FTC5089, the 300 Tdi Discos have a FTC5087. |
|||
13D | FRC5428,26 | FRC5424,19/41/? | FRC5435,40 | FRC5425,? |
22D_suffix_B | FRC5428,26 | FRC7884,19/41/? | FRC7434,40 | FRC7885,? |
29D suffix B | FRC5428,26 | FRC7428,19/41/? | FRC7434,40 | FTC7429,? |
22D_suffix_C | FRC8917,26 | FRC9460,19/41/? | FRC7434,40 | FRC7885,? |
29D suffix C | FRC8917,26 | FRC9552,?/?/? | FRC7434,40 | FRC9551,? |
22D suffix E on | ? | ? | FTC1741,40 | ? |
32D_to_LA939975 | ? | FRC9552,?/?/? | FTC1084,? | FTC1085,? |
32D_from_MA939976 | FTC4188,? | FRC4190,?/?/? | FTC1084,? | FTC4189,? |
Gear | Ratio | Tooth Count | Models Used |
Low Range | 3.3206 | All | |
High Range | 1.113 | ||
1.174 | 101FC | ||
1.3362 | 110 | ||
Overdrive |
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