4 link and Pinion Angle Question

[67rstbkt]

OK, so I've read and read, and searched, followed by more reading on the subject of pinion/drivetrain angle and I'm just confused by it all at this point. I've got a Ridetech 4 link with their coil-overs going into my 67 Firebird. In my Pro-touring book, it seems that the best way to set this up is with engine/transmission pointed down about 3* and rearend pinion down about 3*. I've also read that many prefer down on the engine/transmission around 3-5* and up 3-5* on the rear.

Which is it? I know on the factory setup, my stock rear end was about 3-4* up.

As of this moment, when I set my transmission and x-member in, I pointed that down in the 3-4* range (I'll have to check the exact as it's been awhile since I did that)
Currently, my leaf spring perches are set so that the Ford 9 I have is set up (as in higher) about 3-4*

Will this work ok? On the Ridetech bars I have, the lowers are not adjustable, but the uppers are.

My setup is the Pontiac 400 with a manual transmission (T-56)

Any advice is greatly appreciated

[67rstbkt]

Anyone?? I'm thinking I should go with the transmission pointed down at 3-4* and pinion pointed up at 3-4*

The Protouring book I have shows down on transmission and down on pinion, but for some reason this does not seem right to me.

[bhcustomdesigns]

I always set my pinion angle at 2 degrees down/neg. from parallel,set the pinion and the trans parallel then drop your pinion 2 degrees down/neg.Thats how I do them,there maybe better methods of setup though.

[67rstbkt]

I always set my pinion angle at 2 degrees down/neg. from parallel,set the pinion and the trans parallel then drop your pinion 2 degrees down/neg.Thats how I do them,there maybe better methods of setup though.

Is that with a 4 link or leaf setup? I've read you want down on pinion on a leaf setup?

[marolf101x]

Your AirBar came with a package that has "Do Not Open" on the outside.
You can go ahead and open that now.

On page 4 of the instructions you will find the answer to your questions:
http://www.ridetech.com/store/index.php?dispatch=attachments.getfile&attachment_id=133

Basically, you want 3-5* down on the engine and trans, 3-5* up on the rear.
A properly designed 4-link will have minimal pinion angle change over the stroke of the suspension.
You want the pinion angle set equal to, but opposite of the engine/trans.

Just think of it like one cancels out the other, and you'll remember it then.

[67rstbkt]

Your AirBar came with a package that has "Do Not Open" on the outside.
You can go ahead and open that now.

On page 4 of the instructions you will find the answer to your questions:
http://www.ridetech.com/store/index.php?dispatch=attachments.getfile&attachment_id=133

Basically, you want 3-5* down on the engine and trans, 3-5* up on the rear.
A properly designed 4-link will have minimal pinion angle change over the stroke of the suspension.
You want the pinion angle set equal to, but opposite of the engine/trans.

Just think of it like one cancels out the other, and you'll remember it then.

Yes, I read the instructions, lol - several times. I was still not sure about it which is why I asked here. Thanks for the advice on setting it up, I really appreciate that. If it was worded like you stated above in the instructions it would have been much clearer to me.

[andrewb70]

In simple terms, the front and rear operating angles must be equal, opposite, and as small as possible, without be zero.

The front operating angle is the angle between the transmission output shaft and the driveshaft, while the rear operating angle is the angle between the pinion gear and the driveshaft.

https://static1.pt-content.com/images/noimg.gif

Also refer to this PDF:

http://www.markwilliams.com/servicebull/sb0049.pdf

Andrew