Rover PG1 gearbox
Various Rover PG1 gearboxes have been used in the K Series powered Lotus Elise and the only way to identify them is from the serial number (somewhere) on the housing;
C6BP.... Standard box for Elise Mk1 and MGF
C4BP.... MGF VVC box (as standard but final drive 4.2)
B4BP.... Lotus CR box, Elise Mk1 111s, Elise Mk1 Sport 135 + Elise Mk2 standard box
B4BPU... Exige S1 (uprated)
B4BPQ... Exige S1 with LSD
G6BP.... Elise S2 111S
Gearbox Application Table
| Car | PG1 | 1 | 2 | 3 | 4 | 5 | Final |
| S1 "standard" | C6BP | 3.167 | 1.842 | 1.307 | 1.033 | 0.765 | 3.938 |
| S1 111S & S2 "c/r" | B4BP | 2.923 | 1.750 | 1.307 | 1.033 | 0.848 | 4.200 |
| MGF vvc | C4BP | 3.167 | 1.842 | 1.307 | 1.033 | 0.765 | 4.200 |
| S2 111S "long" | G6BP | 3.250 | 1.895 | 1.308 | 1.033 | 0.848 | 3.937 |
| Eliseparts | 3.167 | 1.842 | 1.410 | 1.100 | 0.910 | 3.938 | |
| Suggested Ideal | *6BP | 2.923 | 1.750 | 1.307 | 1.033 | 0.765 | 3.938 |
| Exige S1 uprated | B4BPU | 2.923 | 1.750 | 1.307 | 1.033 | 0.848 | 4.200 |
| Exige S1 with LSD | B4BPQ | 2.923 | 1.750 | 1.307 | 1.033 | 0.848 | 4.200 |
Gearbox Codes
The first letter is the gearset
c / 3.166 / 1.842 / 1.308 / 1.033 / 0.765
s / 3.250 / 1.894 / 1.222 / 0.848 / 0.649
b / 2.923 / 1.750 / 1.308 / 1.033 / 0.848
k / 2.923 / 1.750 / 1.222 / 0.935 / 0.765
m / 3.166 / 1.842 / 1.222 / 0.848 / 0.649
v / 3.250 / 1.894 / 1.222 / 0.935 / 0.765
t / 3.250 / 1.894 / 1.222 / 0.935 / 0.714
r / 3.250 / 1.894 / 1.308 / 1.033 / 0.765
w / 3.166 / 1.842 / 1.308 / 1.033 / 0.714
l / 2.923 / 1.750 / 1.222 / 0.848 / 0.649
g / 3.250 / 1.894 / 1.308 / 1.033 / 0.849
The number that follows the gear set number is the Final drive ratio
4 = 4.200 (15/63)
5 = 4.062 (16/65)
6 = 3.937 (16/63)
7 = 3.647 (17/62)
The right hand letters are the diff
BP = Open
BPQ = LSD
Gearbox oil
- Texaco MT94
- Castrol TAF-X
- Castrol SMX-S
Other sources of information