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Getting the gear ratios right for a turbo'd 16v is quite important. The difficulty is working out what type of performance characteristics you want from your car. Taller gearing is always a good start as a turbo'd 16v's natural response is of LOADS of torque. If you stick with a shorter geared standard 16v gearbox, you are likely to light the tyres up pretty damn quickly. One recommendation is to go for the Mk3 Golf 16v ABF gearbox which is the tallest of all 16v gearboxes. Another option is to build one yourself using standard cogs from a selection of gearboxes. For example, stock 02A box from a 2.0l 16v Corrado with VR6 Corrado final drive. Both gearboxes are 02A, but with quite different ratios.
Below is are a series of tables of the gearbox codes, although these lists aren't complete, it'll be updated as and when the information makes itself available
020
6 Speed, mechanical clutch
| Code |
Vehicle |
1st |
2nd |
3rd |
4th |
5th |
Final 1 |
| GC |
4 speed up to '80 |
3.45 |
1.94 |
1.29 |
0.97 |
N/A |
3.89 |
| GC,GN |
4 speed from '81 |
3.45 |
1.94 |
1.28 |
0.91 |
N/A |
3.89 |
| GP,GL |
3+E from '81 |
3.45 |
1.75 |
1.06 |
0.71 |
N/A |
3.89 |
| GY |
3+E Pickup |
3.45 |
1.75 |
1.06 |
0.71 |
N/A |
4.17 |
| FO |
11/'78-5/'79 |
3.45 |
1.94 |
1.29 |
0.97 |
0.76 |
3.89 |
| FF,FN,FH |
Up to 07/'80 |
3.45 |
1.94 |
1.29 |
0.97 |
0.76 |
3.89 |
| FF,FN,FH,FJ |
From '81 |
3.45 |
1.94 |
1.29 |
0.91 |
0.71 |
3.89 |
| FM,FD,FK |
Close Ratio |
3.45 |
2.12 |
1.44 |
1.13 |
0.91 |
3.89 |
| 6G |
Euro 8/'82-7/'83 |
3.45 |
1.94 |
1.29 |
1.29 |
0.91 |
3.65 |
| 7G |
Close Ratio, Euro 8/'82-7/'83 |
3.45 |
2.12 |
1.44 |
1.13 |
0.91 |
3.65 |
| 2H |
Close Ratio '83 GTI |
3.45 |
2.12 |
1.44 |
1.13 |
0.91 |
3.94 |
| 4S,AOP,AGS |
'86-'90 1.6L Diesel |
3.45 |
1.94 |
1.29 |
0.91 |
0.75 |
3.94 |
| 4T,8A |
Euro From 8/'83 |
3.45 |
1.94 |
1.29 |
0.91 |
0.75 |
3.67 |
| 7A |
From 8/'83 |
3.45 |
1.94 |
1.29 |
0.91 |
0.71 |
3.94 |
| 4K |
Close Ratio |
3.45 |
2.12 |
1.44 |
1.13 |
0.89 |
3.94 |
| 4Y |
Close Ratio 1.8L 8v |
3.45 |
2.12 |
1.44 |
1.13 |
0.89 |
3.67 |
| 9A,AEN,ACD |
Close Ratio '85-'89 |
3.45 |
2.12 |
1.44 |
1.13 |
0.89 |
3.67 |
| ACH |
'85 1.6L Diesel |
3.45 |
1.94 |
1.37 |
1.03 |
0.75 |
3.94 |
| AGB,2Y |
Close Ratio,16V |
3.45 |
2.12 |
1.44 |
1.13 |
0.91 |
3.67 |
| ACN,AON,ASF,ACL |
1.8L 8V |
3.45 |
1.94 |
1.37 |
1.03 |
0.75 |
3.67 |
| AUG,DGF,DGT |
1.8L 8V '90-'93 |
3.45 |
1.94 |
1.44 |
1.13 |
0.89 |
3.67 |
| AWY |
'90 Diesel |
3.45 |
1.94 |
1.44 |
1.13 |
0.89 |
3.94 |
| AVX |
1.6L TDI ECO |
3.45 |
1.94 |
1.29 |
0.91 |
0.75 |
4.25 |
| CHB,APW,DFN |
From '93 1.8L |
3.45 |
1.94 |
1.37 |
1.03 |
0.85 |
3.67 |
| CHD,DFP,ATH |
From '93 1.9L TD 75hp |
3.45 |
1.94 |
1.28 |
0.91 |
0.75 |
3.67 |
| CHE,DFQ,DGD,AMC |
From '93 115hp, Large input shaft |
3.45 |
1.94 |
1.28 |
0.97 |
0.80 |
3.67 |
02A
5 Speed, hydro clutch
| Code |
Vehicle |
1st |
2nd |
3rd |
4th |
5th |
Final 1 |
| AGC |
Corrado 1.8l 16v |
3.778 |
2.105 |
1.345 |
0.971 |
0.795 |
3.944 |
| AGK |
Corrado VR6 |
3.778 |
2.118 |
1.458 |
1.034 |
0.838 |
3.389 |
| ASD |
Passat 16v |
3.300 |
1.944 |
1.308 |
0.971 |
0.717 |
3.944 |
| ATA |
Corrado G60 |
3.778 |
2.105 |
1.345 |
0.971 |
0.795 |
3.684 |
| ATB |
Corrado G60 |
3.778 |
2.105 |
1.345 |
0.971 |
0.795 |
3.450 |
| AYL,AYK |
Corrado G60, Passat 16v |
3.778 |
2.118 |
1.429 |
1.029 |
0.837 |
3.684 |
| AYN |
Corrado G60 |
3.778 |
2.118 |
1.345 |
0.971 |
0.756 |
3.684 |
| CAW |
Corrado |
3.778 |
2.118 |
1.458 |
1.034 |
0.838 |
3.647 |
| CBA |
Corrado G60 |
3.778 |
2.118 |
1.360 |
0.967 |
0.769 |
3.647 |
| CES |
Corrado 2.01 16v |
3.778 |
2.118 |
1.429 |
1.029 |
0.837 |
3.684 |
| CGY |
Corrado 2.01 16v, Passat |
3.778 |
2.118 |
1.458 |
1.029 |
0.837 |
3.684 |
| CHA |
Passat TDi |
3.778 |
2.118 |
1.360 |
0.917 |
0.717 |
3.944 |
| CDM |
Corrado VR6 |
3.300 |
1.944 |
1.308 |
1.034 |
0.838 |
3.647 |
| CD/ |
Seat Toledo 2.0l 16v |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.684 |
| CHN, CCM |
Corrado VR6, Golf/Jetta III |
3.300 |
1.944 |
1.308 |
1.034 |
0.838 |
3.389 |
| CNL |
Passat 2.0l 8v |
3.778 |
2.118 |
1.458 |
1.029 |
0.837 |
3.684 |
02J
5 Speed, hydro clutch
| Code |
Vehicle |
1st |
2nd |
3rd |
4th |
5th |
Final 1 |
| EDT |
Seat Ibiza Cupra 1.8 20v |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.389 |
| EKW |
Seat Ibiza Cupra 1.9 Tdi |
3.778 |
2.063 |
1.348 |
0.967 |
0.744 |
3.158 |
| EBD |
Mk4 Golf 1.8T (AGU engine) |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
4.235 |
| ENJ |
Mk4 Golf 1.8T (2000) |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.684 |
| EHA |
1.8T (AWP 180bhp) |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.824 |
| CZM |
2.0L Beetle '98 |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
4.235 |
| DQY |
TDI Beetle, Golf/Jetta IV |
3.778 |
2.118 |
1.360 |
0.971 |
0.756 |
3.389 |
| EGD |
1.8T Beetle '99 |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.938 |
| DZQ,EBP,EGT,EKG |
2.0L Beetle,Golf/Jetta IV |
3.778 |
2.118 |
1.360 |
1.029 |
0.837 |
4.235 |
| EKH,EMS,EZK,FBV |
2.0L Golf/Jetta IV |
3.778 |
2.118 |
1.360 |
1.029 |
0.837 |
4.235 |
| EBJ,EGR |
TDI Beetle, Golf/Jetta IV |
3.778 |
2.118 |
1.360 |
0.971 |
0.756 |
3.389 |
| EBQ,EMT |
1.8T Beetle,Golf/Jetta IV |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.938 |
| EGQ,FBW |
2000-up 1.8T Golf/Jetta IV |
3.300 |
1.944 |
1.308 |
1.029 |
0.837 |
3.938 |
| DZC,EHC,EGF |
VR6 Golf/Jetta IV |
3.625 |
2.071 |
1.474 |
1.038 |
0.844 |
3.389 |
| EWW,FBY,FCF |
VR6 Golf/Jetta IV |
3.625 |
2.071 |
1.474 |
1.038 |
0.844 |
3.389 |
02M
6 Speed, hydro clutch, dual final drive
| Code |
Vehicle |
1st |
2nd |
3rd |
4th |
5th |
6th |
Final 1 |
Final 2 |
| tbc |
Mk4 Golf V6 (?) |
3.417 |
2.105 |
1.429 |
1.088 |
1.097 |
0.912 |
4.200 |
3.316 * |
| DRW |
tbc |
3.818 |
2.105 |
1.345 |
0.972 |
0.970 |
0.806 |
3.238(?) |
2.615(?) * |
| ERR |
Seat Leon Cupra R |
3.417 |
2.105 |
1.481 |
1.152 |
1.167 |
0.970 |
3.88 |
3.10 * |
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* The 02M gearbox actually has two final drive ratios. The first one is for gears 1st to 4th, the second for 5th and 6th.
02S
6 Speed, hydro clutch, single final drive
| Code |
Vehicle |
1st |
2nd |
3rd |
4th |
5th |
6th |
Final 1 |
| FYG |
Mk5 Golf, Touran, A3 |
3.78 |
2.06 |
1.45 |
1.11 |
0.88 |
0.73 |
3.65 |
| GLB |
Mk5 Golf, Touran, A3 |
3.78 |
2.27 |
1.52 |
1.18 |
0.96 |
0.82 |
3.65 |
| GQB |
Mk5 Golf, Touran, A3 |
3.78 |
2.27 |
1.52 |
1.18 |
0.96 |
0.82 |
3.65 |
| GQL |
Mk5 Golf, Touran, A3 |
3.78 |
2.27 |
1.52 |
1.11 |
0.90 |
0.77 |
3.94 |
| GQM |
Mk5 Golf, Touran, A3 |
3.78 |
2.27 |
1.52 |
1.11 |
0.86 |
0.73 |
3.39 |
| GQN |
Touran 1.9TDi |
3.78 |
2.06 |
1.45 |
1.11 |
0.86 |
0.73 |
3.65 |
| GQP |
A3 2.0 FSi |
3.78 |
2.27 |
1.52 |
1.18 |
0.96 |
0.82 |
3.65 |
| GXV |
Mk5 Golf, Touran, A3 |
3.78 |
2.27 |
1.65 |
1.27 |
1.03 |
0.86 |
3.94 |
More to come on this, with more details of what ratios are in which gearbox variant...
02A & 02J gearbox differences
The differentials are different. The 02A has push in output shafts on spring clips, whereas the 02J has bolt in output shafts but they are interchangeable as long as you have the correct flanges.
The crown wheels are the same, but the planet gear/LSD bit that differs, which means that the Quaife LSDs that fit these boxes are different
There is no difference in the holes that bolt the gearbox to the engine or the starter into the box, - the only difference is in the lower part of the bellhousing where some cars have a (pointless) girdle on that bolts to the underside of the sump.
The 02J has bigger support webs around the differential area
There is a slight differences in the fixing points for the gearchange cable support bracket
The two mounting holes at the wheel end are slightly different as well. They are threaded on an 02J gearbox, whereas they are just holes with an 02A
The bell housing face that mounts to the block is slightly different
The selector shaft is different, there are two options; either swap to an older selector shaft, or use the 02J selector shaft with a Mk4 Golf shifter box.
The 02J boxes out of a 1.8T, the axle flanges are 108mm as opposed to 100mm, so it'll require either custom axles, or swap the axle flanges.
The 02J 100mm axle flanges part number ends in D, all other 02J axle flange part numbers are 108mm.
02S the 02A replacement?
The research suggests that the 02S found in the Mk5 Golf, A3 and Touran appear to be an 02A/J with an extra cog. It seems that VW have produced a 6 speed without the dual output shafts.
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16v Turbo conversion 
