RS Motorsport :: Classic Speed Restored

Posted: **Sun Aug 16, 2009 3:18 pm**

if i use a higher diff ration :ie 3.77 instead of 3.55 do i need more or less teeth on my speedo drive gear?

My understanding is tailshaft turns a bit faster so i need an extra tooth?

Does anyone know how many teeth a std type9 box has on the speedo drive?

Posted: **Sun Aug 16, 2009 6:56 pm**

You can get a 22T, 23T & 24T.

I am running a 24T with a 4.11. Purchased from Burtons

Stnd i believe is 22T

Burton Part No:
GBT9302 24T
GBT9301 23T
GBT9300 22T

Posted: **Sun Aug 16, 2009 8:12 pm**

Ok Bill thanks, so that tells me i need 23T....
Does your speedo read correct now?

Posted: **Mon Aug 17, 2009 5:35 pm**

mm this is handy to know,I have a t9 box and 3.9 diff and am around 10% faster out.

Posted: **Tue Aug 18, 2009 8:15 pm**

Posted: **Wed Aug 19, 2009 7:56 am**

Posted: **Wed Aug 19, 2009 8:45 am**

Posted: **Wed Aug 19, 2009 8:37 pm**

Posted: **Thu Apr 29, 2010 3:49 pm**

Ive removed the engine and box from my RS today,in prep for the new warmer 2ltr engine ive built, going in in the next couple of weeks,can any one get the t9 speedo drives in australia, Im running a 3.89 diff so was going to go for the 24t????. its currently 20% + out
if not I may have to go through burtons.

cheers
dave

Posted: **Fri Apr 30, 2010 6:56 pm**