[mudzookacoatsy]

Ok so like it says. I've got 6.5s and 31, how far out would my speedo be ?

[lump_a_charcoal]

Compare with a GPS?

I think from memory, about 15%?

[denty802]

the 6.5's wouldnt affect the speedo would it?
im curious on this too as i've got 31's and have 6.5s coming

[mudzookacoatsy]

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

[lump_a_charcoal]

What diff ratios do you have?

[suzukikid]

in mine if ya doin 85 its 100...... 50 is 60.....

[mudzookacoatsy]

Standed diffs

[lump_a_charcoal]

WT or NT?

[mudzookacoatsy]

Wt

[shep]

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

[mudzookacoatsy]

How would that work the. With tha gears droping it done so low ??

[SierraDan]

mudzookacoatsy wrote:

How would that work the. With tha gears droping it done so low ??

The worm gear is still the same.

[mudzookacoatsy]

Oh ok so really it's just my tyres that have put it out

[SierraDan]

Yep, tyres and diff gears are what put it out.

[hutch]

suzukikid wrote:

in mine if ya doin 85 its 100...... 50 is 60.....

x2 same as me, checked against GPS
apparently High range rduction is 11%

[hutch]

SierraDan wrote:

Yep, tyres and diff gears are what put it out.

bahhaaaa!

[hutch]

shep wrote:

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

the speedo cable is mounted to the transfer case not the diffs.

[hutch]

have a look through here and you will see the difference in gear sizes between old and new. The high range is the big one. often you have to grind the transfer case back so the gears can actually fit in.
http://www.trail-gear.com/pdf/suzuk-tcase.pdf

[shep]

hutch wrote:

shep wrote:

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

the speedo cable is mounted to the transfer case not the diffs.

so, are you saying that i am wrong?

[mudzookacoatsy]

Cool thanks for all ya help guys

[shep]

mudzookacoatsy wrote:

Cool thanks for all ya help guys

so which do ya believe?

trans gears change speedo or don't change speedo?

i am just curious.

[hutch]

shep wrote:

mudzookacoatsy wrote:

Cool thanks for all ya help guys

so which do ya believe?

trans gears change speedo or don't change speedo?

i am just curious.

put ya car up on blocks.. remove the tail shaft then put it in gear and rev it... That will tell ya.

[hutch]

shep wrote:

hutch wrote:

shep wrote:

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

the speedo cable is mounted to the transfer case not the diffs.

so, are you saying that i am wrong?

yep

[JrZook]

hutch wrote:

shep wrote:

hutch wrote:

shep wrote:

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

the speedo cable is mounted to the transfer case not the diffs.

so, are you saying that i am wrong?

yep

Speedo cable is mounted to the tcase correct. It's driven off the tcase output shaft which is directly connected to the diffs. Thus any tcase reduction is "up stream" from where the speedo pickup is, hence reduction gears don't do a thing to the speedo

[atari4x4]

hutch wrote:

shep wrote:

hutch wrote:

shep wrote:

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

the speedo cable is mounted to the transfer case not the diffs.

so, are you saying that i am wrong?

yep

how does it feel to be wrong?

[shep]

atari4x4 wrote:

hutch wrote:

shep wrote:

hutch wrote:

shep wrote:

mudzookacoatsy wrote:

Yeh it does cos ya speedo drive goes in to ya tcase and tha gears drop the gearing over the lot hi 4hi and Low

nope. transfer gears don't affect speedo only diff gears affect speedo

the speedo cable is mounted to the transfer case not the diffs.

so, are you saying that i am wrong?

yep

how does it feel to be wrong?

ahhh but i am not wrong

[shep]

tell me how the output shafts speed is made different to road speed.

or to put it another way what is inbetween the tyre contact patch and the transfer output shaft.

[JrZook]

Diff gears and that's it................

[MART]

Shep is right , tyres and diff ratios are the only way to affect speedo , on a sierra transfer , put it in gear with tail shaft of and rev , this is only going to show the gearbox and transfer ratio verse speedo indication.

The speedo is gear driven on a sierra , so the only way to alter this is by changing the tyre diameter or changing diff gearing , any other way is wrong , wrong , wrong , Cheers Paul.

[skyman]

Just to confirm from the outside Shep is on the money. it is pretty much common knowledge here that the transfer gears do not affect the speedo reading, only tires and diffs will.

The speedo function is based on the RPM of the transfer output. Anything past the transfer case will throw it out, anything in front of the transfer will not.