R154 Speedo drive conversion

[PeterD]

Hi, I have a R154 behind a Holden Monaro HQ Coupe and the speedo is about 20k out. It has a 10-33 drive in it now and would need something like a 10-30 or perhaps 10-28 (so I'm told). Does anyone know if these are available and what the Toyota part numbers are?

 

[Peewee]

The problem with just changing the outer gear is that the inner gear has a finite number of outer gears it can correctly mesh with.

The 10-33 will most likely have an inner gear that will be stamped with (31-33), so you are limited to a 10-31 before you run the chance of eventually stripping the outer gear (I have no idea of time frame).

I did have a larger number of part numbers but I've lost it. This is what I've found though.

31-tooth = 33403-29145
33-tooth = 33403-29115
34-tooth = 33403-39075
35-tooth = 33403-19235

 

[PeterD]

Thanks PeeWee, I ended up going for the CRS corrector ($128) as none of the gear combinations would correct to 21kph. Thanks anyway