The V8 Owners Forum -

Posted: **Tue Jan 07, 2014 5:43 pm**

i have an lt77 from a v8 injected rover sd1 in my escort,

do all lt77's have the same speedo drive on the gearbox?

Posted: **Tue Jan 07, 2014 6:58 pm**

Early SD1s had a mechanical speedo - later ones electronic. If yours came from a Vitesse, it will be electronic and for a 3.08 rear axle, 15" wheels, and 205/60 tyres.

Posted: **Tue Jan 07, 2014 7:05 pm**

so it will be 1 of 2 connections?

Posted: **Tue Jan 07, 2014 11:36 pm**

poo slinger wrote:so it will be 1 of 2 connections?

Not quite sure what you mean?

Posted: **Tue Jan 07, 2014 11:39 pm**

what i mean is, are there only 2 diffrent types of connections on the gearbox end of the cable?

Posted: **Wed Jan 08, 2014 9:26 am**

poo slinger wrote:what i mean is, are there only 2 diffrent types of connections on the gearbox end of the cable?

It must be me, but I still don't understand what you're asking.

There are alternate drives (and internal gears) for different rear axle ratios on both mechanical and electronic types. As far as I know they are all interchangeable, but you do have to use the correct drive gear which is inside the box.

Posted: **Wed Jan 08, 2014 6:48 pm**

well i am after getting a speedo cable made to go from lt77 to my ford gagues,

its the gearbox end of the cable i need to find out,

Posted: **Wed Jan 08, 2014 7:40 pm**

poo slinger wrote:well i am after getting a speedo cable made to go from lt77 to my ford gagues,

its the gearbox end of the cable i need to find out,

All the RV8 LT77's with a speedo cable are the same fitting at the gearbox end. The electronic speedos don't have a cable, but the trigger unit fits in the same place as, and can be replaced with, a mechanical unit.

Posted: **Wed Jan 08, 2014 11:49 pm**

I think the 3.08 drive (20 teeth) cable drive is NLA from Rimmer, so you might have to search for a used one.

Posted: **Thu Jan 09, 2014 6:11 am**

If you know what ends you need,speedy cables will make you one,

Posted: **Thu Jan 09, 2014 11:49 am**

www.speedycables.com

Used them in the past myself.

Posted: **Thu Jan 09, 2014 10:30 pm**

so i will have to get under the car to determine what one?

Posted: **Thu Jan 09, 2014 11:28 pm**

poo slinger wrote:so i will have to get under the car to determine what one?

If it is the gearbox from an 'injection' SD1 (which would be a Vitesse, as the EFI is only auto) then it will have a drive for an electronic, not mechanical, speedo. Unless it has already been changed.

Posted: **Thu Jan 16, 2014 2:12 pm**

DaveEFI wrote:I think the 3.08 drive (20 teeth) cable drive is NLA from Rimmer, so you might have to search for a used one.

I have several mechanical ones , inc the bearing holder ...not sure what colours i have left now

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