[MikeP]

Most people go for the Renault 21 Turbo box as this has the best ratios and is the strongest standard box. There are a few different Renault boxes around. I have a 21 turbo box in one of my GTD's and a Renault 30 (369 type) box in the other. Final drive choices depend on end end use and the top speed you want. Short ratio better acceleration but lower top speed and vice versa. Here is some info about the choices available

Model Part No. Ist 2nd 3rd 4th 5th Rev Diff
20 369.00 3.36 2.06 1.38 1.06 0.82 3.55 4.11
369.05 3.36 2.06 1.38 1.06 0.82 3.55 4.11
20TX 369 3.36 2.06 1.38 1.06 0.87 3.55 3.778
20LS/TS 369 3.82 2.18 1.41 1.03 0.86 3.55 3.778
21Turbo UN1-013 3.36 2.05 1.38 1.03 0.82 3.54 3.44
25GTX UN 1-03 3.36 2.05 1.38 1.04 0.82 3.55 3.89
25V6 UN 1-04 3.36 2.05 1.38 0.96 0.76 3.55 3.89
Alpine GTA UN1-05 3.36 2.05 1.38 1.04 0.82 3.55 3.44
25 Blindee UN 1-06 3.36 2.05 1.38 0.96 0.76 3.55 4.11
Alpine Turbo UN1-07 3.36 2.05 1.38 0.96 0.76 3.55 3.44
25V6 Turbo UN1-08 3.36 2.05 1.38 0.96 0.76 3.55 3.778
30TX 369-01/06/017 3.36 2.05 1.38 1.06 0.82 3.55 3.89
30TS 369-01/06/014 3.36 2.05 1.38 1.06 0.82 3.55 3.89

Cheers
Mike