[Bigred92]

Gday Guys,

I have just put a set of 31s onto my (apparently stock) hardtop sierra.

With the factory tyres on the speedo was out by 10km/h at 100ks (read 110)

Now with the 31s on it has corrected my speedo, does this mean that at some point TC gears have been done?
I cant think of any other explanation.

If any one has any ideas that would be great

[sideways]

No, that's completely normal. Sierra speedos are pretty optimistic. Transfer gears wont change your speedo reading anyway.

It is possible you have lower diff gears, which would correct your speedo.

[Pappabeer89]

Bigred92 wrote:

Gday Guys,

I have just put a set of 31s onto my (apparently stock) hardtop sierra.

With the factory tyres on the speedo was out by 10km/h at 100ks (read 110)

Now with the 31s on it has corrected my speedo, does this mean that at some point TC gears have been done?
I cant think of any other explanation.

If any one has any ideas that would be great

Mine has new 31's on and my speedo reads 100 then I do 103 on the GPS and mine is definitely stock gearing (Suzuki SJ413) Same as a Sierra 1.3.

Just for reference.

Kind regards
Jacques Goosen