Thread: Diff Ratio's

4.11's will bring you back to standard with 33's, and then 35's will bring it out again by a few %. I think it is 4.3 which will correct a 35. I run 4.11 in a rover diff for mine. The problem with continuing to lower the diff ratios is that the gears become weaker. As I understand it, the 4.11's despite having a smaller pinion (and so loaded area on the crown wheel) than the 3.54, the strength is regained by better metallurgy. 4.7's in a Rover diff I would expect to be seriously pushing the friendship with 35" tyres. From what I have found with a TD5 Auto, is that 4.11's are fine with 35's, though I would not expect that to be the case with a manual gearbox.

4.3 here with direct high range t/case.

Michael.

Originally Posted by Slunnie

4.11's will bring you back to standard with 33's, and then 35's will bring it out again by a few %. I think it is 4.3 which will correct a 35. I run 4.11 in a rover diff for mine. The problem with continuing to lower the diff ratios is that the gears become weaker.

The 4.11:1 ratio are an after-market replacement for the Rover crownwheel and pinion.

Another option which may be cheaper is the 3.9:1 ratio found in late 1950's/1960's Rover 3 litre P5 cars. They use a 10 spline axle the same as most classic Range Rovers.

Diana

Hi Jezzaol
what did you have to do to fit 35 on your disco
what i mean did you have to put a big body lift on it mate

Why not keep the 3.54 in the diffs for ease and change the high range gearing in the t/case to the gearset out of a fender would be cheaper and simple to fit

Originally Posted by mills rover

Hi Jezzaol
what did you have to do to fit 35 on your disco
what i mean did you have to put a big body lift on it mate

I fitted a 40mm Body Lift, 2" Suspension Lift, cut about 2" out of the guards about the body lift was without other major mods. I have done a few before with no body lift and bigger suspension lift but they dont drive as nice (to me anyway) I fitted 100mm ABS Scorpion Racing Flares and get full Articulation out of them. Flares are a bolt through style giving much better looking finish and makes it easier to cut the flares.

Originally Posted by lokka

Why not keep the 3.54 in the diffs for ease and change the high range gearing in the t/case to the gearset out of a fender would be cheaper and simple to fit

Hmmmmmmmm.... now this is the info im chassing, what is involved in that ? Any more info ?

Originally Posted by Jezzaol

Hmmmmmmmm.... now this is the info im chassing, what is involved in that ? Any more info ?

Yep get a std 1.3 to 1 gear set from a fender lt230 and swap it with yours and u should get the reduction ya need my bro has a county with the 1.3 to 1 high range and he's running 37's with 3.54 diffs and its ok tho could be just a little lower