Previous Thread
Next Thread
Print Thread
differential angle #173725
12/23/08 11:48 PM
12/23/08 11:48 PM
Joined: Oct 2007
Posts: 403
Laredo, Texas USA
H
hugo Offline OP
mopar
hugo  Offline OP
mopar
H

Joined: Oct 2007
Posts: 403
Laredo, Texas USA
I have 69 Rooad Runner that I just finished the front strut suspension. It has ladder bars in the back. My question is how many degrees should the differential have? Mine has 5 degrees but someone told me that its wrong that it should hav zero to 1. Anyone with similar suspension? How many degrees to do you have yours?

The car has a 499ci with powerglide weight is 2850 with driver making about 770hp.

Re: differential angle [Re: hugo] #173726
12/24/08 12:30 AM
12/24/08 12:30 AM
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL Offline
Senior Member of the Junior Dragster Club
WILD BILL  Offline
Senior Member of the Junior Dragster Club

Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
Leaf sprung cars have more axel wind up and therfore reguire more angle than say a 4 link or ladder bar set up that has almost no wind up if it has any at all. 5* would be ok for a stock spring set up but W/ a ladder bar you should set it closer to 1* nose down.


BTW, Mine is a 4 link and I have 1* nose down

Last edited by WILD BILL; 12/24/08 12:32 AM.
Re: differential angle [Re: hugo] #173727
12/24/08 03:05 AM
12/24/08 03:05 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
Bend,OR USA
When you say differential angle where are you measuring from and in relation to what.? If you have five degrees difference between the drivesahft and the pinion shaft with the pinion shaft having a nose down angle then that will work fine on a ladder bar car. If the pinion is nose up in relation to the drive shaft adjust the pinion so it is pointed nose down from the driveshaft at least two degrees so the U joint cups will rotate on the U joint shafts and lubricate each other instead of burnelling(SP?) the needles to death ruining the U joints


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: differential angle [Re: Cab_Burge] #173728
12/24/08 09:49 AM
12/24/08 09:49 AM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
master
B G Racing  Offline
master

Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
If your referring to pinion angle: springs 4* to 6*---ladder bars 2*------4 link 1*

Re: differential angle [Re: B G Racing] #173729
12/24/08 10:09 AM
12/24/08 10:09 AM
Joined: Oct 2007
Posts: 403
Laredo, Texas USA
H
hugo Offline OP
mopar
hugo  Offline OP
mopar
H

Joined: Oct 2007
Posts: 403
Laredo, Texas USA
Ladder bar but is it 2 nose down or nose up?

Re: differential angle [Re: hugo] #173730
12/24/08 11:00 AM
12/24/08 11:00 AM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
master
B G Racing  Offline
master

Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
The degress are negative of the drive shaft angle is the one school of thought.the other is negative of the trans tailshft angle.Let the war begin

Re: differential angle [Re: hugo] #173731
12/24/08 02:00 PM
12/24/08 02:00 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Quote:

Ladder bar but is it 2 nose down or nose up?


Pinion gear is always nose down unless your in a way jack up four wheel drive vehicle that has the trans 18 inches or higher than the pinion gear and then you might want the pinion gear straight or 3 to 5 degrees down from the driveshaft in a negative angle, pinion down fom the driveshaft centerline


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: differential angle [Re: hugo] #173732
12/24/08 02:15 PM
12/24/08 02:15 PM
Joined: Jan 2003
Posts: 8,016
Polson, MT
DoctorDiff Offline
master
DoctorDiff  Offline
master

Joined: Jan 2003
Posts: 8,016
Polson, MT
Technically, "pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft.

Setting pinion angle is easy for your application. Make the pinion parallel to the transmission as a base-line, then roll the pinion downward 2 degrees. This downward angle is referred to as "2 degree negative" pinion angle.

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.

Re: differential angle [Re: DoctorDiff] #173733
12/24/08 03:41 PM
12/24/08 03:41 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
I Win
Q

Joined: Jan 2003
Posts: 32,394
Quote:

Technically, "pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft.

Setting pinion angle is easy for your application. Make the pinion parallel to the transmission as a base-line, then roll the pinion downward 2 degrees. This downward angle is referred to as "2 degree negative" pinion angle.

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks

Re: differential angle [Re: Quicktree] #173734
12/24/08 04:11 PM
12/24/08 04:11 PM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
master
B G Racing  Offline
master

Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
"pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks


Ok you contridiction of terms,who you calling "old dogs"

Re: differential angle [Re: B G Racing] #173735
12/24/08 04:13 PM
12/24/08 04:13 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
I Win
Q

Joined: Jan 2003
Posts: 32,394
Quote:

"pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks


Ok you contridiction of terms,who you calling "old dogs"




if you have fleas scratch them

Re: differential angle [Re: Quicktree] #173736
12/24/08 04:44 PM
12/24/08 04:44 PM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
master
B G Racing  Offline
master

Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
Quote:

Quote:

"pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks


Ok you contridiction of terms,who you calling "old dogs"




if you have fleas scratch them


No fleas,got the crotch crickits Can you lick your own balls I have my advantages over you young pups.

Re: differential angle [Re: Quicktree] #173737
12/24/08 06:25 PM
12/24/08 06:25 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,007
Bend,OR USA
Quote:

Quote:

Technically, "pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft.

Setting pinion angle is easy for your application. Make the pinion parallel to the transmission as a base-line, then roll the pinion downward 2 degrees. This downward angle is referred to as "2 degree negative" pinion angle.

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks


Your right, us old dogs know when we are right, why change what you think because the majority thinks your wrong


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: differential angle [Re: Cab_Burge] #173738
12/24/08 06:36 PM
12/24/08 06:36 PM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
master
B G Racing  Offline
master

Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
Quote:

Quote:

Quote:

Technically, "pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft.

Setting pinion angle is easy for your application. Make the pinion parallel to the transmission as a base-line, then roll the pinion downward 2 degrees. This downward angle is referred to as "2 degree negative" pinion angle.

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks


Your right, us old dogs know when we are right, why change what you think because the majority thinks your wrong


Go get em Cab.We been doing it wrong for so many years that it seems to work out right for us.That this is relative to that or isn't to this is a contridiction by their own defination.The best place to find all things relative or all relatives in general is at a West Virgina wedding.

Re: differential angle [Re: Cab_Burge] #173739
12/24/08 06:44 PM
12/24/08 06:44 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
I Win
Q

Joined: Jan 2003
Posts: 32,394
Quote:

Quote:

Quote:

Technically, "pinion angle" is relative to the transmission centerline, not to the ground or to the driveshaft.

Setting pinion angle is easy for your application. Make the pinion parallel to the transmission as a base-line, then roll the pinion downward 2 degrees. This downward angle is referred to as "2 degree negative" pinion angle.

Most of the time in stock bodied cars, a 2 degree negative pinion angle will still point upward, relative to the ground.




but Cass you know you can't teach these old dogs new tricks


Your right, us old dogs know when we are right, why change what you think because the majority thinks your wrong




yea these guys don't know what they are doing either they only have some of the quickest and fastest cars on the planet.


Pinion Angle
Tired of breaking cases and drive shafts? There are many books that misled you on setting the pinion angle. For Drag Racing this is simple. You are trying to set the pinion angle to be parallel with the centerline of the engine & transmission on hard acceleration. To achieve this you must first figure out the parallel setting of the rear end to correspond to the angle of the engine & transmission, then add the proper amount of pinion angle. Add 1 deg. for 4-Link vehicles, 2 to 3 deg. for ladder-bar vehicles. Place stands under suspension to duplicate vehicle at ride height. Caution do not remove drive shaft without securing vehicle first. Take measurement with drive shaft removed.

Re: differential angle [Re: Quicktree] #173740
12/25/08 11:09 AM
12/25/08 11:09 AM
Joined: Jan 2003
Posts: 3,059
Swamps of South Jersey.
W
wildcargo Offline
master
wildcargo  Offline
master
W

Joined: Jan 2003
Posts: 3,059
Swamps of South Jersey.
I would like to put a camera under my car and see what changes it goes thrugh as my car makes a run. I run 10* nose down in relation to the drive shaft, but if you look at my car in the photo you can see the spring allmost hitting the ground on launch . I ran the car with from 5* to 10* noes down in relation to the drive shaft for a lot of years. I have an extra 1/2 leaf on top the spring in the front section of the spring and a clamp at every leaf.

4900645-10.08A.JPG (36 downloads)

Bud www.wildcar-go.itgo.com
64 DODGE
60' 1.433,
1/8 6.38 at 107.4,
1/4 10.08 at 132.02
foot brake, leaf springs
Re: differential angle [Re: wildcargo] #173741
12/25/08 11:21 AM
12/25/08 11:21 AM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
I Win
Quicktree  Offline
I Win
Q

Joined: Jan 2003
Posts: 32,394
Quote:

I would like to put a camera under my car and see what changes it goes thrugh as my car makes a run. I run 10* nose down in relation to the drive shaft, but if you look at my car in the photo you can see the spring allmost hitting the ground on launch . I ran the car with from 5* to 10* noes down in relation to the drive shaft for a lot of years. I have an extra 1/2 leaf on top the spring in the front section of the spring and a clamp at every leaf.




I have thought about that also.I bet there is some good info to be gained in that area.

Re: differential angle [Re: Quicktree] #173742
12/25/08 12:23 PM
12/25/08 12:23 PM
Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing Offline
master
B G Racing  Offline
master

Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
Too many post about the same thing.







Powered by UBB.threads™ PHP Forum Software 7.7.1