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4 and 5 Speed gearboxes (LT77)
All models of the SD1 are fitted with the same ratio 5 speed
box (with some exceptions, see notes below) The bell housing 
will be different for each engine type as well as axle ratio's.

Gear ratio's 5 speed series 2. all models 5th 0.792:1
(Series 1, 5th Gear: 0.833:1) *see note. 
2400SD see note**

4th 1.000:1 All other ratio's as listed.
3rd 1.396:1
2nd 2.087:1
1st 3.321:1
Rev 3.428:1
*Note: Later series 1, cars have series 2, ratio's i.e. 5th gear ratio. ** 2400SD Diesel 5th gear ratio 0.77:1, Axle ratio 3.9:1, no auto option. The Vitesse and VDP EFi have the same ratio's, but are uprated to cope with the higher powered engines. Having shot-peened gears, and stronger bearings.

GM180 auto boxes fitted to the Vitesse and VDP EFi use standard ratio's but have uprated clutches and other differences affecting pressures and gear change speeds These can be fitted to normal VDP cars but gear changing will be at slitly higher speeds and the speedo reading will be incorrect where axle ratios are different? Note: All models: If replacing a manual gearbox? fit the later stronger types with improved bearing ect, suffix D, E, etc. The suffix letter appears after the serial No: i.e.17A01234567D (i.e. suffix 'D')
Automatic box Ratio's 
Borg-Warner 65 and 66      
Top 1.00:1	                    
2nd 1.45:1                   
1st 2.39:1                   
Rev 2.09:1        
GM180 (1982 on)
Top 1.00:1
2nd 1.48:1
1st  2.40:1
Rev 1.92:1
Axle ratio's as fitted to models 
3.08:1 (RM) 2600 auto, 3500 man/auto.
3.08:1 (RM) Vitesse manual, VDP EFi auto, (VDP EFi no factory manual option)
3.45:1 (RL) 2000 auto, 2300/2600 man.          
3.90:1 (RT) 2000/2400SD man.
2.85:1 (RH) Vitesse auto (early models or fitted as factory option)
Letters in brackets are codes stamped on axle casing

Speedometer drive gears, Manual & BW 65/66 auto
Transducer and gear 
Axle 3.08:1    Orange  20T   Internal gear    Black 8T
  "    3.45:1    Black     23T      "         "        ?      ?
  "    3.90:1    Red       22T       "         "       White 7T
Speedometer drive gears GM180 auto
Axle 2.85:1 Transducer gear  Yellow.    19T   Internal gear Blue   8T
 "     3.08:1     "             "       Red.       18T        "     "      Brown 7T
 "     3.45:1     "             "       Blue        20T       "     "        ?       ?
Note: GM180, the transducer, 2 gears, and support bearing are all separate parts.
Both gears have to be changed to suit axle different ratio'.
Auto box codes
  Borg Warner 65/66 1976-82
021G 3500 BW 65
036T 2300/2600
053G 3500 Police
059M 2600
061R 3500
068E 3500SE/VDP BW 66
070H 3500 Police
079D 2000
081G 2300/2300S/2600S
082D 2600 Police
  GM180 1982 on (series 2)
TH 3500 GM180, G-box ident plate (green)
PG 3500 Australian
TK 2600
PK 2600
TL 2300
PL 2300
TM 2000
TT VDP EFi, G-box ident plate (orange)
TT Vitesse, G-box ident plate (light green)