diff ratio

[gw4xls]

please can anybody tell me if i have an open diff and the two wheels are of the ground do i still have to turn the wheel 2 times to get the ratio or just one time from what i have read if one wheel is on the ground you have to turn two times but in my case the 2 wheels will be off the the ground this is for a open diff many thanks. this is urgent please help.

ian

[slim]

please can anybody tell me if i have an open diff and the two wheels are of the ground do i still have to turn the wheel 2 times to get the ratio or just one time from what i have read if one wheel is on the ground you have to turn two times but in my case the 2 wheels will be off the the ground this is for a open diff many thanks. this is urgent please help.

ian

it would be easy just to read your vin plate and read the axle code.......

[gw4xls]

its a second hand diff i am goin to buy and i need to know how to check the ratio and there is no vin plate and no possible no colour on the pinion

[slim]

its a second hand diff i am goin to buy and i need to know how to check the ratio and there is no vin plate and no possible no colour on the pinion

so i take it that the diff is no longer on the vehicle??????

if so then what you could do is mark one of the spline inputs on the diff and put one mark on the flange that fixes to the prop, then turn the flange until the mark on the input spline as rotated 2 revolutions while also taken note how many revs the flange as gone the amount of revs that the flange as gone is your actual ratio!!!!!!!

[gw4xls]

no in breakers yard do i still have to turn the stub axle (wheel )2 times as the other side will also be of the ground,i know when one side is on the ground you have to turn it 2 times to make up for the other side on the ground

[gw4xls]

it a complete axle

[slim]

it a complete axle

see what you mean now dont think i read your first thread right!!!!

well i have an open diff and it doesnt make any difference with the 2 wheels off the floor counts the same as if one wheel is on the floor!!!!!

have you a fault with yours?????

[gw4xls]

see what you mean now dont think i read your first thread right!!!!

well i have an open diff and it doesnt make any difference with the 2 wheels off the floor counts the same as if one wheel is on the floor!!!!!

have you a fault with yours?????

yes too much play in diff makes clunk when i put it in drive and reverse.


so do you mean you u still have to turn it 2 rev even with the2 wheels off the floor to get the ratio, can i phone u if u give me ur no as i am going to pick one up in the morning and i need to tell if it is the wright ratio!!!!!

[exmee46]

The diff normall transmits drive equally to both output shafts. The planetary gear arrangement inside the diff ensures that any increase in rotation of one drive shaft is equal to decrease on the other side.

It follows therefore that if one shaft is stationary, the other will turn at 2 x normal speed.

So if both wheels are off the ground, the diff will behave as if it was a solid axle and your ratio will be number of input shaft turns required to rotate the output shafts once.

If only one wheel is on the ground, the free output shaft will rotate twice as fast therefore true ratio will be twice what you observe when you rotate the inpput shaft to get one output revolution. In other words - yes let it go round twice.

Kev

[gw4xls]

The diff normall transmits drive equally to both output shafts. The planetary gear arrangement inside the diff ensures that any increase in rotation of one drive shaft is equal to decrease on the other side.

It follows therefore that if one shaft is stationary, the other will turn at 2 x normal speed.

So if both wheels are off the ground, the diff will behave as if it was a solid axle and your ratio will be number of input shaft turns required to rotate the output shafts once.

If only one wheel is on the ground, the free output shaft will rotate twice as fast therefore true ratio will be twice what you observe when you rotate the inpput shaft to get one output revolution. In other words - yes let it go round twice.

Kev

hi kev will i have to turn shaft 1 or2 times if the both wheels are off the ground to no the ratio tanks

[exmee46]

hi kev will i have to turn shaft 1 or2 times if the both wheels are off the ground to no the ratio tanks

With both wheels off the ground, turn the propshaft enough to rotate the roadwheels once. Ratio = no of propshaft turns : 1. For example, if you have to turn the propshaft a bit more than four and a half times to turn the roadwheels once, your diff will be the 4.556:1 ratio.

Kev