Diff Ratio help please

[kykin]

have read a few things saying how to figure yours out, but i gave it a go by jacking up one side of my open rear, and got 2.25 ish drive shaft turns to one tyre rotaion......

2 turns making 4.5ish couldnt see exactly but pretty dam sure....

so that gets me closer to a 4.56 then a 4.3 diff....... any one confirm for me?

my head hurts

[James W]

sounds like 4.56, but to be sure do something like 10 turns, and divide by 10.... improves the accuracy somewhat or even 45 if still not sure etc.... It's handy to have a mate spin the wheel while you count the tail saft turns.... a bit of tape or chalk is a good marker

[muvit madness]

jamesw said:

sounds like 4.56, but to be sure do something like 10 turns, and divide by 10.... improves the accuracy somewhat or even 45 if still not sure etc.... It's handy to have a mate spin the wheel while you count the tail saft turns.... a bit of tape or chalk is a good marker

Hi
just to add to what james w said,
I'm just wandering if its a auto or manual you drive coz if it's auto it's more likely to be the 4.55 & 4.3 for the manual.

cheers
muvit

[kykin]

tis a 5sp manual...... but since i needed 2 turns to get 4.5 wouldnt it be 10 turns divide 5? to get 4.56 again hopefully.

[geeves]

A lot of 2.8 Mus got the 4.56 regardless. Mainly because they also got 31 inch tyres

[James W]

My point with two turns, as there is not enough differance to confidently be sure the differance between a 4.56 and a 4.3 diff... that is 0.23 differance... can you really tell that accurately? the back lash could be that much..... Try 10 turns and divide by 2... as you have one wheel on the ground, one off. Therefore the differance between 4.56 and 4.3 will be 2.3 turns on the tailshaft... and easy to spot