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Originally posted by Eskypower
Thanks Steve, what would I do without you?

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You'd get more done in a work day and have more space in your factory. :)

This is probably more of the same but also discussed here...

http://www.cortina-mk1classifieds.com/forum/showthread.php?2030-Diff-pinion-angle

Shaun

I have just checked out my prop. It has a little side play in the front uni. the other uni at the back doesnt. I just paid $400 to get a custom 3inch shaft made and supposedly balanced and the idiots cant even install uv joints properly. I also had my lowering blocks machined on an angle for my hilux diff to get my propshafts on similar angles

Well, finally got some time this afternoon to rip the tailshaft out of the Escort and take some measurements. Only problem is that I found some bad news. It is good in a way though as now I know for sure what is causing the vibration.

The diff pinion is sitting at 0 degrees (as I suspected) but the gearbox in it's current untouched position is -5 degrees. I also found that I could check it by sitting the gauge on the top of the rocker cover.

So now the problem is how to adjust it. I removed the spacers from the gearbox mount and raised it 10mm which brought it back to 3.5 degrees. The gearbox and exhaust now hit the body so I think I am gonna have to adjust it at the diff end.

Can anyone see anything wrong doing it this way, so that the diff is pointing up +5 degrees and the gearbox is down -5 degrees.

Thanks for all your help so far.

Craig.

that will be fine if they are equal and opposite. got mine within 3deg and it fixed it.

5 degrees high might cause your diff to hit the body if the car is lowered, also make sure they are not at exactly the same opposing angles as this can cause rapid universal joint wear. its better to have them within 1 or 2 degrees.

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

Hi Guys, my mk2 cortina does the same thing, smooth when under accelleration or on cruise but as soon as the lift completely off the accellerator it vibrates the slightest touch of the pedal stops it though. mine has standard gearbox tailshaft and diff, is fairly low though.