Hi guys,. I'm looking at fitting a 5 speed to my 340. I have got a box with a 3.82 ratio and the original 4 speed it the 3.64, now because I run 13" wheels with only 55 profile my cruise speed is low so was wondering about swapping the ratios over to give better cruise with the new 5 speed.
So my main question is are the pinion gears the same pitch and number of teeth between the two diffs or would I have to swap both crown and pinion gears over?
Thanks guys.
Also I have looked for an answer in the old threads but can't find anything about the pinion gear teeth number

4 speed diffs don't fit 5 speed boxes I don't think unfortunately.
I'd think you'll be fine with the 5 speed diff ratio though.

kevlar1981 wrote:Also I have looked for an answer in the old threads but can't find anything about the pinion gear teeth number

Must look harder Here's something about the pinion gear teeth number: viewtopic.php?f=13&t=3544&start=45

From the Green Book: viewtopic.php?f=36&t=7262


V300_man_gearbox_ratios by macplaxton, on Flickr

V300_man_gearbox_final_drive_ratios by macplaxton, on Flickr

V300_man_gearbox_final_drive_features by macplaxton, on Flickr

From back of a fag packet (or robbed from Mac*):

3.91:1 (43/11)
3.82:1 (42/11)
3.64:1 (40/11)
3.45:1 (38/11)
3.36:1 (37/11)
3.27:1 (36/11)

For any other ratio, work it out yourself...

kevlar1981 wrote:now because I run 13" wheels with only 55 profile

More info please. I guess it could be anywhere between 165 and 205mm?

Do the sums now and work out what you'd be happy with and then work out what bits you can use/need.

Brilliant thanks for that that's just what I wanted to see the pinion gears being the same number of teeth.
Top man

Irrespective of tooth-count, crown wheel and pinions are made and sold as matching sets. Just because they have the same number of teeth, doesn't necessarily mean they are physically the same size either.

Always change crown wheel and pinions as a matched set. Doing otherwise is pure folly.


To steal a line from Mac, "But then what do I know ??"