Assume this is a Ford live axle.
The 4.11 is the ratio. You have a number of standard ratios to choose from with a Ford diff, normally anything from 3.54 to 4.44.
4.44 is the lower ratio and 3.54 the higher. Assuming you are happy with your current ratio then a straight replacement is the way to go. If you take out the old diff you can count the teeth on the crown wheel and pinion, (or whats left of them) and divide them to confirm the ratio. I think for a 4.11 the crown wheel has 37 teeth and the pinion 9.
Do you repair or get a new one? You'll be lucky to get a new one.
It really depends what the damage is. I would suggest you take out the diff first and have a look. Is it an LSD?
Likelihood is that damage will be to crown wheel and/or pinion teeth, or the pinion bearings.
Your options are to contact one of the specialist gearbox/diff builders (Road and Race, BGH etc.) for a rebuild or visit a scrap yard for one, although there are not many live axles around. The 4.11 was fitted mainly to Escort vans/estates.
If you need a slide hammer to remove the half shafts, I can lend you one.
Paul Richards
Area Representative - L.A.D.S. (Lancashire and District Sevens)
www.lads7.co.uk
Growing old is compulsory - Growing up is optional
Edited by - Paul Richards on 14 May 2007 22:42:10
Edited by - Paul Richards on 14 May 2007 22:44:54