This chart is meant to represent the various gearsets available over the years for the Herald-based Triumphs and in what cars each gearset was commonly found. This information is not meant to imply interchangeability, although it is possible in some cases to install a gearbox from one model into another (i.e., Toledo gearboxes in Mk.IV Spitfires) with little or no modification required. Except as noted, overdrive units are not discussed here. Other models are also listed for comparison purposes.
| Model / overall ratios |
4th |
3rd |
2nd |
1st |
rev. |
final |
mph/ |
Mayflower |
-- |
1.0 |
1.67 |
3.54 |
4.11 |
|
|
overall |
-- |
5.125 |
8.56 |
18.14 |
21.04 |
5.125 |
14.4 |
Triumph 10 |
1.0 |
1.454 |
2.46 |
4.271 |
4.271 |
|
|
overall |
4.55 |
6.60 |
11.19 |
19.43 |
19.43 |
4.55 |
14.7 |
Herald 948 |
1.0 |
1.454 |
2.46 |
4.271 |
4.271 |
|
|
overall twin carb. |
4.55 |
6.62 |
11.20 |
19.45 |
19.45 |
4.55 |
14.0 |
overall single carb |
4.875 |
7.09 |
11.99 |
20.82 |
20.82 |
4.875 |
13.5 |
Herald 1200 & 13/60*; Spitfire 4, Spitfire 4 Mk2, Spitfire Mk.3 |
1.0 |
1.4 |
2.16 |
3.75 |
3.75 |
|
|
overall |
4.11 |
5.74 |
8.88 |
15.42 |
15.42 |
4.11 |
15.7 |
Spitfire Mk.IV -- three-rail, all-synchro; also U.S. Spitfire 1500 1973[-74**] |
1.0 |
1.39 |
2.16 |
3.51 |
3.86 |
|
|
overall |
3.89 |
5.41 |
8.41 |
13.65 |
15.00 |
3.89 |
16.7 |
overall ratios, U.S. spec. 1972 Mk.IV |
4.11 |
5.71 |
8.88 |
14.43 |
15.86 |
4.11 |
15.7 |
Spitfire 1500, 1975 on -- "Marina" single-rail gearbox |
1.0 |
1.39 |
2.16 |
3.50 |
3.85 |
|
|
overall |
3.63 |
5.05 |
7.84 |
12.70 |
13.99 |
3.63 |
18.0 |
overall ratios, U.S. spec. 1500 |
3.89 |
5.41 |
8.41 |
13.65 |
15.00 |
3.89 |
16.7 |
Toledo |
1.0 |
1.39 |
2.16 |
3.50 |
3.99 |
|
|
overall |
4.11 |
5.73 |
8.86 |
14.40 |
16.40 |
4.11 |
15.0 |
1500 (Dolomite) |
1.0 |
1.39 |
2.16 |
3.50 |
3.99 |
|
|
overall |
3.89 |
5.42 |
8.39 |
13.63 |
15.51 |
3.89 |
16.9 |
Dolomite Sprint |
1.0 |
1.39 |
2.10 |
2.99 |
3.37 |
|
|
overall |
3.45 |
4.8 |
7.25 |
10.31 |
11.62 |
3.45 |
18.9 |
Vitesse 6/Sports 6 1600 |
1.0 |
1.25 |
1.78 |
2.93 |
2.93 |
|
|
overall |
4.11 |
5.74 |
8.88 |
15.42 |
15.42 |
4.11 |
16.4 |
Vitesse 2L & Mk.II; GT6 and GT6 Mk.2/GT6+ |
1.0 |
1.25 |
1.78 |
2.65 |
3.10 |
|
|
overall (Vitesse) |
3.89 |
4.86 |
6.92 |
10.30 |
12.06 |
3.89 |
17.3 |
overall (GT6) |
3.27 |
4.11 |
5.82 |
8.66 |
10.13 |
3.27 |
20.15 |
GT6 Mk.3 *** |
1.0 |
1.25 |
1.78 |
2.65 |
3.01 |
|
|
overall |
3.27 |
4.11 |
5.82 |
8.66 |
9.85 |
3.27 |
20.15 |
TR7 4-speed (Federal); Dolomite 1850HL |
1.0 |
1.26 |
1.78 |
2.66 |
3.02 |
|
|
overall |
3.63 |
4.56 |
6.47 |
9.65 |
10.95 |
3.63 |
18.0 |
|
* |
Herald 13/60 Estate 16.3 mph/1000 rpm (5.60 x 13 tires) | ||||||
|
** |
1974 Spitfire 1500 in US equipped with 155SR13 tires, which might affect mph/1000rpm figure slightly |
||||||
|
*** |
GT6 Mk.3 transmission with O/D had 3.58 reverse (11.71 overall) gear. | ||||||
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8/31/02; revised 11/22/13