Just been on the fone to cts, he said the s1 gearbox has a 4.2 final drive and s2 has a 3.8, after umming and arring i went for the 3.8 as i thought id be doing say 100 mph and the engine wont be revving as hard, so there for not thrashing my engine,
After using the original 4.2 in my old box wot difference will i see good or bad?