...i noted on both my front and rear diff it has 3.9 on them whats the difference from std??....Any stronger/more reliable...i noted a strengthening plate too on the front.

 

Shorter gearing for better acceleration / slower top speed - no other difference (as in no stronger).

 

No stronger, just lower geared, so brings the gears closer together, potentially making it accelerate quicker.

Top end speed will be lowered of course, but will still be higher than is ever really needed on the road IMHO!


Downside is revs when cruising on the motorway are increased.

 

I might have to disagree with Mike slightly

and think that because of the way the Gearing is lowered it takes stress off the tranmission in first gear and therefore does increase reliability slightly if you are launching it.

3.9 gearing is great mod and one of best things I had done to the Sierra

 

Mike didnt say that the gearing wont releieve strain potentially, he said that they arent any stronger.

Taking weight or power out of the car will also help lengthen a diffs life if launched a lot for example.

 

Sorry it was Ima who mentioned reliabilty. Thought it was Mike.

 

Learn to read, or has love blinded you that much?

 

No the damage was done pre-love...



Through excessive wanking

 

Generally people have suffered more failures with 3.9:1 front diffs, and the use of a 3.62:1 with drop gears is the norm.....