Thread: Speedo Correction.

Is it worth the effort?

I drove my Series III for 23 years knowing that I was doing 100 km/h when the speedo indicated 90 km/h.

So around town, I just had to sit on about 55 km/h to be right on the speed limit.

Maybe something off a stage1 if they had 3.54 gears ( assuming the V8's did ) ?

Originally Posted by vnx205

Is it worth the effort?

I drove my Series III for 23 years knowing that I was doing 100 km/h when the speedo indicated 90 km/h.

So around town, I just had to sit on about 55 km/h to be right on the speed limit.

Most definitely!
I am not sure what the reason for your speedo error was but a diff change from 4.77 to 3.54 is far greater than 10% error that you had.
Consequently it would be a lot better to have an accurate odometer reading.

Cheers, Mick.

As loanrangie suggests, speedo off a Stage 1 may work. But it has a different gearbox/transfer case - and I do not know whether the speedo drive gears are the same ratio.

John

Mick, the reason for my speedo error was because my LWB Series III was almost certainly built up from the spare parts bin by a previous owner.

I only discovered that the engine was an early Series II when I measured things in preparation for fitting new rings and bearings.

The shackles and spring mounts as well as the bull bar appeared to be military in origin, but everything else was civilian.

I always suspected that some part of the speedo or speedo drive had come from a SWB designed to have smaller tyres. It was only after I sold the vehicle that I learned (on this forum) that there are identifying numbers on the speedo dial related to the overall gearing.

I'm fairly sure my speedo head was from a SWB, but by the time I knew that, I had sold the vehicle.

if my calculations are right, your diff change would create an error of about 34%. I can see that might be inconvenient.

Dismantle speedo, scan and print a new dial, glue it on, coat of clear. Working out the calibration, good luck.


Cheers Greg

Ratio adaptor.

https://www.flexibledrive.com.au/products/05/ratio.php


Colin