I bought a used/abused '76 Capri II with a 289/T5/4.11:1
8" Ford, but the idiot previous owner screwed up the rear
end install something serious. He had the pinion pointing
at the tranny, it's about 7 degrees up, and the tranny is
about 2 degrees down...
I'm looking at resetting the pinion to about 5 degrees
down, but it may not be enough...
The pinion angles should be the same at both ends of the driveshaft.
Are you getting any vibration or "U" joint wear?
pinion angle should be pointed down 2 to 5 deg depending on horsepower. when you launch the car the pinion should come up in direct line with the drive shaft.
i have read several articles saying both pinion angles should be the same. i am not going to argue the point. all the drag racers i know all set the rear angle and don't worry about the front one. your choice.
Drag cars are set up for constant acceleration and axle twist................street cars are not.
Re: pinion angle
For street use the angles should be parallel. If the trans angle is 3* down the pinion angle should be 3* up as in this drawing from the Inland Empire Driveline web site.
What lead me to the problem was the vibration
when I got on it, wicked doesn't begin to come
close to discribing it... So for my lunch hour
today I spent a bit of time gathering data at
work today, basicly going around measuring
pinion angles of various vehicles in the parking
lot. Most of them were stock, but a couple are
somewhere between mild and wild street cars,
one of them is the equivilent of the Capri, it's
a mid '80s Mustang with a 347, T5, and 3.70:1
gearing, his pinion is set at 6* down, while the
tranny is 2.5* down, so I think I'm on the right
track, all I have to do is find/build a 13* shim,
I'll let you know how it goes...
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