pinion angle question again

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terry

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ok folks i'll try and explain my spec.'s and tell me what you think.
putting a cheap harbor freight degree finder on the flat spot of the rear end yoke with it being parallel with the floor 1/2 tank of gas and driver in the car i get a 7 degree reading. when i mount the fixture on the input yoke for the trans i get 2 degree's. now both reading are on the same side of the dial so i can't say positive or negitve for either reading. so i have a total of 9 degree's between the 2 readings. am i in the ball park or do i need shim's to help for a better setting
thanks
terry
 
Depends on your set up Caltracs, mono leafs? SS Springs & Pinion Snubber etc?

More information needed
 
If this is a regular leaf spring set up,a 4-6 degree down on the pinion is normal,under load it will come up a bit and straighten out the drive line,set it to 5 degrees and you good,mrmopartech
 
ok let me add this info
leaf springs super stock type,pinion snubber set at 1/2 from floor.
now when i look at the third member is is angle facing up towards the floorboard. so if i understand mrmopartech i need to put shims in to point the rear end yoke more towards the floor?
terry
 
Mopar Performance suspension book says 5-7 degrees "nose down" which means the front of the pinion points down in relation to the driveshaft. You've got 5 degrees. Right on the money.
 
Is the tailshaft point down or up
Pinion pointing down or up.

If the tailshaft is down 2* you need the pinion to be up 2* to be at zero. Then roll it down 4-6 degrees so it ends up being anywhere form 2 to 4* pointing down.

The way it sounds currently you have a +5 angle, VERY BAD.
 
crackedback said:
Is the tailshaft point down or up
Pinion pointing down or up.

If the tailshaft is down 2* you need the pinion to be up 2* to be at zero. Then roll it down 4-6 degrees so it ends up being anywhere form 2 to 4* pointing down.

The way it sounds currently you have a +5 angle, VERY BAD.
Click to expand...

Same scenario with Caltracs & No Pinion Snubber would be?? Would the Caltracs need to be loaded against the spring or should there be a little gap before they HIT?

Thanks Rob!
 
Mad Dart said:
Same scenario with Caltracs & No Pinion Snubber would be?? Would the Caltracs need to be loaded against the spring or should there be a little gap before they HIT?

Thanks Rob!
Click to expand...

Separate deals. Pinion angle and preload are set individually with cal tracs.

I'd set the pinion at -4 and then have the drivers side bar just touching and the pass side touch plus 2-3 flats. Flats being the flat side of the adjusting nuts. That's a decent starting point.

There are situation where you want no preload in the pass bar at all and a slight air gap on drivers, don't think your Dart fits that group.

Rancho shocks, put drivers at 5 and pass at 7.

The part nobody pays attention to, most of hooking a car is forward of the rear spring front mounts.
 
crackedback said:
Separate deals. Pinion angle and preload are set individually with cal tracs.

I'd set the pinion at -4 and then have the drivers side bar just touching and the pass side touch plus 2-3 flats. Flats being the flat side of the adjusting nuts. That's a decent starting point.

There are situation where you want no preload in the pass bar at all and a slight air gap on drivers, don't think your Dart fits that group.

Rancho shocks, put drivers at 5 and pass at 7.

The part nobody pays attention to, most of hooking a car is forward of the rear spring front mounts.
Click to expand...

Are you referring to Torque Boxes both front and rear, Sub-frame connectors etc?
 
yes crackedback,
my tail shaft yoke is pointing down 2 degree's and the pinion yoke is pointing up 6 degree's. so what do i do to fix it? add 4 degree shims to the rear?
terry
 
You need to cut the perches and reset them.

Read my first response that has your answer.
 
terry said:
yes crackedback,
my tail shaft yoke is pointing down 2 degree's and the pinion yoke is pointing up 6 degree's. so what do i do to fix it? add 4 degree shims to the rear?
terry
Click to expand...

You will need to bring it down 8-10*, you will not be able to fix that with a shim! The biggest shim I have found is a 6* and you will loose almost the whole centering pin in the leafs using it. Don't ask me how I know this.
 
ok mad dart i will not ask.
but now let me throw in a question to you that with what i did may affect the angle
i have a 68 barracuda with 275 x 70 x 15 rear tire. this size did fill my wheel well and looks good. but the front of the tire was about 3/8 from the wheel well so i figured i could just pull the rear end back about an 1/2 inch by drilling a new hole in the spring perch and resetting the rear on the stud in the new hole. its been a couple of years now and all seems to work except a vibration in the body which brought me to the pinion question.
thanks
terry
 
As Crackedback said -4 down,your gonna have to remove the perches and reweld them with the center pointing down -4.I,m just rewelding mine now as the welds letgo.So back to work for me.LOL
Racing the 66 Dart 017.jpg

Racing the 66 Dart 017.jpg
 
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