Changing Diff Gear Ratios

[Charisma]

Does anybody out there know how easy it is to change the overall gear ratio in a diff?

A mate of mine said that you could just change a cog in the diff at relatively little expense.

I have a Megabusa that 'revs out' in 6th on the track and I just need another 10mph to avoid keep hitting the rev limiter. I have the Sierra LSD with a 3.36 ratio.

[grahambell]

You'd certainly have to change the crownwheel (big cog) and I suspect you'd have to change the pinion (little cog that drives it) as well. Not sure what other ratios of diff are available for Sierra, but doubt you'll get much higher/taller gearing than you already have.

Maybe worth having a word with an axle reconditioner (see Yellow Pages) to check ratio situation with them and ask how much an exchange recon unit with higher ratio would cost.

If no higher ratio available you could raise gearing by fitting larger diameter wheels/tyres.

[accident]

contact the bike tuners as you can get taller gear sets for the busa(not cheap but you get the ratio's you want,or you could find a sierra diff 3.14(rare)also in a different casing to yours needing different shafts also didnt come with an lsd(yours wont fit).
my advice buy the gear set ot at least a high 6th.
fit bigger wheels(i know it knackers the handling on a 7 but its high speed option)