Standard pinion angle on an escort is 4 deg.

The other thing that occurs here is that when you give the car a big bootful, the pinion climbs up the ring gear, changing the diff pinion angle.

You can end up with a car that is smooth under hard acceleration but have a vibe at 100 kph or smooth at 100 kph but has a vibe under hard acceleration.

Just another way Escorts play with your head.....but its well worth finding the compromise set up so its smooth everythwhere.

And try to avoid having the diff pinion and gearbox output exactly lined up as the unis stop working properly and the bearings chew themselves up (its called brinelling).

They need to be parallel and within about 2 deg of each other, a little nose down on the diff helps to stop the pinion climb problem under hard acceration.

Cheers

Shaun B