Offroad-Express

I have a manual diesel D21 and i wanting to know what diff ratio i have... Fitted with 33's it runs at around 2500rpm at 100kph on the speedo, yet 100kph on the speedo seems to be about the right actual speed. If anything it could be slightly faster than the true speed so it seems the rear diff is not original. does anyone know what diff ratio could give me this?

Also could someone please advise me on how hard it is to swap over a diff head ie. setting correct backlash??

thanks

sounds like you have a 4.6 diffs look under the bonnet to your left you will see the ID tag should say HG 4.6 or 4.3 4.8

On 33's with 4.8's, I run the 4.6 speedo drive and it is almost perfect.
Thanks TD Power, saves me typing a long winded answer.
Cheers,

Ok thanks, I probably have a 4.8 diff then. Like i said i think the diff is not standard. If it was it means that with the standard tires fitted in 5th at 100kph the engine would be sit at around 3000rpm... seems way too high.

Are the 4.8's out of the V6 petrols?

Search
http://www.offroadexpress.co.nz/Forums/viewtopic.php?f=25&t=23380&hilit=+diff+ratios
Cheers,