speedos and diffs

Post by **FrankM83** » Tue Mar 14, 2006 7:49 pm

Hi all I have another question if i change the diff of a van to a car do i have to change the speedo? if yes how will i know if a speedo came off a car or a van or even a Morris Minor not a mini? thanks

Post by **Onne** » Tue Mar 14, 2006 10:10 pm

there are numbers on the face of them. I am sure Willie will come along and inform you about them. So you do have to change the speedo.

Sorry to not be more of help

Post by **Willie** » Wed Mar 15, 2006 8:41 am

If you change only the diff ratio then the simplest way would be to have the
speedo recalibrated, (someone on here will recommend a company). Problems arise when you change speedos if they are from different Minor
models as the fuel gauges need their own particular types of sender unit in
the tank in order to work properly. To advise you we need to know the
year and present running gear of your vehicle.

Post by **FrankM83** » Wed Mar 15, 2006 9:35 am

thanks for the help well the vehicle is a Minor pick-up from 1966 it runs a 1098cc engine a box and commercial diff as it is low

Post by **rayofleamington** » Wed Mar 15, 2006 10:09 am

then, it is not so hard - you can use a diff and sp[eedo from a 1098 car

this link covers a lot of the info:

http://potteries.mmoc.org.uk/Identify.htm

Post by **FrankM83** » Wed Mar 15, 2006 5:32 pm

thanks but can I fit a diff from a car and recaliber the van's speedo instead of changing it?

Post by **Willie** » Wed Mar 15, 2006 11:00 pm

If you change to a 4.22-1 diff then you need to aquire a speedo with the
number on the face SN4477/80 (bronze coloured face) or, on a black faced
speedo SN4419/04(mph),or SN4419/05(kph). Another suitable black faced
type is SN4423/06. Any of these will go straight in and need no modifications.

Post by **engine_tuner** » Wed Mar 15, 2006 11:57 pm

If you get stuck try these guys www.speedycables.co.uk

you take some measurements, send them your speedo and it comes back perfectly calibrated.

Post by **rayofleamington** » Thu Mar 16, 2006 9:01 am

thanks but can I fit a diff from a car and recaliber the van's speedo instead of changing it?

Re-calibration can fix the speed reading, however this will not correct the mileage innaccuracy!
Best bet is to get a speedo matching a 4.22 diff

Post by **KirstMin** » Thu Mar 16, 2006 12:56 pm

this guy will re-callibrate both your speedo and milage if you give him the readings he requires. Costs about £35 inc VAT. Nice chap too...

http://www.jdo1.com/

Instructions on his site but give him a call and he'll talk you through it

Post by **Willie** » Thu Mar 16, 2006 7:29 pm

When I changed my speedo I adjusted the mileage reading to match the old
one and it was a fairly easy job. It was over eleven years ago but I remember it as being very straightforward.

Post by **bigginger** » Sun Mar 19, 2006 6:47 pm

Cam's page was useful, but I have 2 speedos numbered 4423/00 and 4423/04, neither of which seem to be covered. Probably 4:55, both black face and MPH. Any clue anyone? It'd be great if one was a 4:22

Post by **Rasputin** » Sun Mar 19, 2006 10:17 pm

I have a speedo numbered SN4423/04 Fitted to my pickup, and I`m pretty sure I have a 4:22 Diff fitted if that`s any help?

Post by **bigginger** » Sun Mar 19, 2006 10:52 pm

It would make sense, certainly - I've got a couple of them, and didn't compare them to the ones in cars - it was dark! I wonder what the 00 is - Mini or something?

Morris Minor Owners Club

speedos and diffs

speedos and diffs

speedo

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