New speedo cable doesn't fit!

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Hi folks,

I'm at the final stages of the 90 rebuild. A new replacement speedo cable (cheapo) fits the square drive socket on the old transfer box, but not the (also old) replacement box. The square socket on the box I am using is too small to accept the square shaft!

Apologies if this is covered elsewhere on the forom, but I had a quick search, and it doesn't seem to be a common issue..

The square end of the old cable shaft is solid, so I could easily file down its faces slightly, and fettle it to fit. The plastic clock connector on the other end, however, is dead, and hence the replacement. But the end of the new cable shaft is wound all the way, and I am concerned that it would ruin the cable to remove any material.

The real sob story is that ive been working on this (my first rebuild) for over a year, and simply need the truck on the road so I can use it for work. But finishing it is so tedious and time consuming, having overcome many issues, but essentially the wiring is what is really phasing me. I have been waiting for a auto electrician to help me with this since October.

The transfer box now has EP90 oil in it, and I want to avoid stripping anything else off. Do I need a specific speedo cable to fit the ever so slightly smaller drive socket?
 

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May just be a 5hit quality cable, you could try filing the square part to fit the transfer box.
You can pull the speedo drive out of the transfer box without dismantling anything and inspect the drive and cable close up.
 
On your rebuild have you changed the transfer box?

Yes, I have another transfer box off a 110 on there, which I was informed had not done too much work, but I wasn't actually aware of anything wrong with the old one. The square cable drive fits fine in the old box, but won't even reluctantly fit in the current one.
 
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Quick look & found this
7CD90546-20F9-476C-B3DF-8B2E7F0D1300.jpeg


Number 18 does stick in the transfer box sometimes. I think I drilled a small hole in this,deep enough for.a drift/centre punch to rotate it a bit to loosen. Then long nose piers to pull the drive out.
 
Brilliant! That's all very helpful, thanks. I found that the drive in the old box, the one off the vehicle, was stuck so fast I had to remove the output shaft/bearing housing assembly off to knock it out from the inside. I extracted the mini spindle part 16 as above, without müllering the plastic splines too much, but you can imagine my amazement and relief when the drive from the box on the vehicle prised out with no argument!
This has made my day :)
 
Make a note of the colour of your speedo drive. there are different ones dependant on your tyre size.

Thanks, that is interesting. Its a faded yellowish plastic drive which I removed from the old box and refitted in the vehicle. The one in the (TD5?) box was black. It makes sense to use the original one, but what size tyres? I got this 10 years ago with 205's fitted, and put road tyres on with a notably larger diameter. Now going back to 205's

I've no idea whether I drove it for a long time with inaccurate readings, and would satnav give a reliable benchmark by which to test it? The implication is that we should all change our speedo drive whenever there's a change of tyre diameter..
 
This might help.

just fit the closest to the size of tyres you have fitted and your speedo will be about right


Land Rover 90/110 speedo drive gears

  • Colour: blue/20 teeth - Part number: FRC3310 - Tyres: 7.50/16 or 235/85/16
  • Colour: green/21 teeth - Part number: FRC3311
  • Colour: yellow/22 teeth - Part number: FRC3312 - Tyres: 205/16 tyres
  • Colour: red/24 teeth - Part number: FRC3313
 
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