Running staggered tires

[Starglider]

The only way this would work is if you changed the differential gearing to match the change in tire circumference. But even if you could find the appropriate replacement diff it would be very difficult to get it exactly right.

[JoFotoz]

Diffs dont have to be changed.. IMO

The only way this would work is if you changed the differential gearing to match the change in tire circumference.
But even if you could find the appropriate replacement diff it would be very difficult to get it exactly right.

Many have changed tire diam, hence Cirumf and run OEM diffs.
(Tire width doesnt matter to the gearing of the diffs.)

It will give false speedo/mileage readings with larger/smaller tire diam/circumf...
.........but TOD etc will all still work as long as all 4 are matched.

And if you do change diffs... as some, including me have....

...you must change both

Jo

.

[Starglider]

It will give false speedo/mileage readings with larger/smaller tire diam/circumf...
.........but TOD etc will all still work as long as all 4 are matched.

And if you do change diffs... as some, including me have....

...you must change both

What I meant was, in theory you could run different sized tires on the back vs the front if the differential ratios were varied by the same amount, so that the RPM seen at the transfer case would still match. i.e. if putting larger tires on the back on, replace rear diff with one that has slightly more reduction.

However this wouldn't work in practice because;
a) it would be really hard to get exactly the right ratio and
b) I just remembered that TOD uses individual wheel speed sensors, not drive shaft sensors, so it would still see slip and constantly engage.

In theory you could fix (b) by hacking the wheel sensor electronics or magnet ring, but that's a crazy amount of effort just to have different tires.

[JoFotoz]

Yea..NO...not in theory..not even in practice !!

To make the transfer case/TOD work in harmony ...

...front AND rear diff need to be equal.

AND..all tire sizes need to equal.


You have a VERY limited set of options of diff gearing on the 10 & 12 bolt
Isuzu diffs.
( so..the "matching the ratio"...is not possible..you get as close as you can!)

I run 4.77's..It close! for my 35's..but could be better!

If you have different diff front to back..
...you"ll
(A) explode the TOD..
..and
(B)..grenade the transfer case...
and
(C) never get going!..at all!


Please ...do correct me if I'm wrong..
.....but I have re-geared several VX''s

I think I have this right

Jo

[mdwyer]

b) I just remembered that TOD uses individual wheel speed sensors, not drive shaft sensors, so it would still see slip and constantly engage.

I'm not sure this is true. There are wheel speed sensors, but they only feed into the ABS system. I'm pretty sure the TOD speed sensors are completely separate and only on the drive shafts, and it is only able to detect front/back differences.

Doesn't change the fact that it is probably a bad idea to run different sized tires! I'd be curious if tires the same diameter would work okay, though... I just wouldn't be curious enough to do it on MY VX.