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Angle on the rear axel perch #3117886 01/31/23 12:16 PM 01/31/23 12:16 PM
Joined: Jan 2004 Posts: 8,343 fredericksburg,va C cudaman1969 OP master
cudaman1969 OP master C Joined: Jan 2004 Posts: 8,343 fredericksburg,va	Hey folks question for ya. I’m getting the Dana under the Duster and need to know if the angle is the same for S/S springs and the Calverts Mono spring. IIRR stock is 5 degrees? Does that need to change? Also on trial fit the housing needs to be shifted about 1/4” to the passenger side. Is this normal? Edit, talking about the saddle that’s welded to housing Last edited by cudaman1969; 01/31/23 12:18 PM.

Re: Angle on the rear axel perch [Re: cudaman1969] #3117912 01/31/23 02:18 PM 01/31/23 02:18 PM
Joined: Feb 2015 Posts: 2,080 CA C crackedback top fuel
crackedback top fuel C Joined: Feb 2015 Posts: 2,080 CA	5 is correct for stock. Best to get it loaded at fully weight and set it.

Re: Angle on the rear axel perch [Re: crackedback] #3117918 01/31/23 02:54 PM 01/31/23 02:54 PM
Joined: Mar 2006 Posts: 9,871 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,871 MI, usa	Stock angle of the perch is 5 degrees pointing up towards the pinion. I've had luck setting them at 3 up. The best way to get the angle perfect is leave them unwelded, clamp them in the car, mark them, then weld. However if you are building a new housing it's always nice to weld the ends on last in case there are any alignment issues from welding. If it's an existing housing make short 1" welds on th eperches and allow to cool betewwen welds. Doug Last edited by dvw; 02/01/23 08:15 AM.

Re: Angle on the rear axel perch [Re: dvw] #3117931 01/31/23 03:24 PM 01/31/23 03:24 PM
Joined: Jan 2004 Posts: 8,343 fredericksburg,va C cudaman1969 OP master
cudaman1969 OP master C Joined: Jan 2004 Posts: 8,343 fredericksburg,va	Thank you both, what I was thinking also. 9x30 tire fits real good, 1” on front and back, spring is about 1/2 to 5/8 “ from sidewall

Re: Angle on the rear axel perch [Re: cudaman1969] #3117942 01/31/23 04:06 PM 01/31/23 04:06 PM
Joined: Sep 2003 Posts: 19,591 north of coder moparx "Butt Crack Bob"
moparx "Butt Crack Bob" Joined: Sep 2003 Posts: 19,591 north of coder	it's also entirely normal for the side to side measurement to vary up to 3/4" [yes, i have seen three quarters of an inch ! ] from side to side measurements. 1/4 and 3/8" are very common. just the quality control of the era. also, who knows what has happened to a particular vehicle in the 50-60 years since it was built ?

Re: Angle on the rear axel perch [Re: cudaman1969] #3118021 01/31/23 11:16 PM 01/31/23 11:16 PM
Joined: Jul 2009 Posts: 112 pa gregcharger72 member
gregcharger72 member Joined: Jul 2009 Posts: 112 pa	the pinion will be need changed the calvert mono leaf is basicly flat where the ss is arched i just did this exact swap. i ordered up a moser fab housing and axle package and had the perch angle set at the stock angle . then installed the cal tracks mono springs . i needed a 4 degree wedge to get the negative three degree pinion angle recommended by calvert. i should have had the pinion angle set on the housing at 0 then i would not need the wedge to correct the pinion angle.

Re: Angle on the rear axel perch [Re: gregcharger72] #3118041 02/01/23 01:20 AM 02/01/23 01:20 AM
Joined: Jan 2004 Posts: 8,343 fredericksburg,va C cudaman1969 OP master
cudaman1969 OP master C Joined: Jan 2004 Posts: 8,343 fredericksburg,va	Originally Posted by gregcharger72 the pinion will be need changed the calvert mono leaf is basicly flat where the ss is arched i just did this exact swap. i ordered up a moser fab housing and axle package and had the perch angle set at the stock angle . then installed the cal tracks mono springs . i needed a 4 degree wedge to get the negative three degree pinion angle recommended by calvert. i should have had the pinion angle set on the housing at 0 then i would not need the wedge to correct the pinion angle. Is this a B-Body or A-Body car? Leaning more now to wait for the springs before welding up

Re: Angle on the rear axel perch [Re: cudaman1969] #3118042 02/01/23 01:28 AM 02/01/23 01:28 AM
Joined: Jan 2003 Posts: 31,072 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,072 Oregon	Originally Posted by cudaman1969 Hey folks question for ya. I’m getting the Dana under the Duster and need to know if the angle is the same for S/S springs and the Calverts Mono spring. IIRR stock is 5 degrees? Does that need to change? Also on trial fit the housing needs to be shifted about 1/4” to the passenger side. Is this normal? Edit, talking about the saddle that’s welded to housing No, the angle is not the same between SS springs and Calvert mono springs. SS springs require a lot of angle while the Calverts are almost flat. You need to mock it up with the car near full weight before you can figure out the perch angle.

Re: Angle on the rear axel perch [Re: cudaman1969] #3118046 02/01/23 04:19 AM 02/01/23 04:19 AM
Joined: Aug 2003 Posts: 43,285 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,285 Bend,OR USA	I wouldn't worry so much about the spring perch angle, I would set the pinion angle compared to the driveshaft at rest with the normal weight you will drive the car with and adjust that angle as needed and then weld the perches on Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Angle on the rear axel perch [Re: Cab_Burge] #3118053 02/01/23 08:18 AM 02/01/23 08:18 AM
Joined: Mar 2006 Posts: 9,871 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,871 MI, usa	I agree with the 1/4 panels being off. Now is the time to offfset the housing for clearance. For instance; a 3/4" bigger gap on one side can be corrected by moving the spring perches 3/8" inward on one side and outward on the other. My wifes Challenger was off 5/8" Doug

Re: Angle on the rear axel perch [Re: cudaman1969] #3118063 02/01/23 09:48 AM 02/01/23 09:48 AM
Joined: Jul 2009 Posts: 112 pa gregcharger72 member
gregcharger72 member Joined: Jul 2009 Posts: 112 pa	Originally Posted by cudaman1969 Originally Posted by gregcharger72 the pinion will be need changed the calvert mono leaf is basicly flat where the ss is arched i just did this exact swap. i ordered up a moser fab housing and axle package and had the perch angle set at the stock angle . then installed the cal tracks mono springs . i needed a 4 degree wedge to get the negative three degree pinion angle recommended by calvert. i should have had the pinion angle set on the housing at 0 then i would not need the wedge to correct the pinion angle. Is this a B-Body or A-Body car? Leaning more now to wait for the springs before welding up it is a b body, a 72 charger to be exact. if you are not impatient like me, it will be less work to wait. LOL

Re: Angle on the rear axel perch [Re: gregcharger72] #3118064 02/01/23 09:58 AM 02/01/23 09:58 AM
Joined: Feb 2004 Posts: 34,942 S.E. South Dakota ! bigdad Still Posting A Lot
bigdad Still Posting A Lot Joined: Feb 2004 Posts: 34,942 S.E. South Dakota !	what ever happened to quicktree .. ? The lips of fools bring them strife, and their mouths invite a beating.Proverbs 18:6

Re: Angle on the rear axel perch [Re: gregcharger72] #3118085 02/01/23 11:36 AM 02/01/23 11:36 AM
Joined: Jan 2004 Posts: 8,343 fredericksburg,va C cudaman1969 OP master
cudaman1969 OP master C Joined: Jan 2004 Posts: 8,343 fredericksburg,va	Originally Posted by gregcharger72 Originally Posted by cudaman1969 Originally Posted by gregcharger72 the pinion will be need changed the calvert mono leaf is basicly flat where the ss is arched i just did this exact swap. i ordered up a moser fab housing and axle package and had the perch angle set at the stock angle . then installed the cal tracks mono springs . i needed a 4 degree wedge to get the negative three degree pinion angle recommended by calvert. i should have had the pinion angle set on the housing at 0 then i would not need the wedge to correct the pinion angle. Is this a B-Body or A-Body car? Leaning more now to wait for the springs before welding up it is a b body, a 72 charger to be exact. if you are not impatient like me, it will be less work to wait. LOL I will wait, for now getting tires in right spot for clearance. Now I’ll do the T alignment (chalk lines and plumb bob) on floor to get the axel square to body

Re: Angle on the rear axel perch [Re: bigdad] #3118133 02/01/23 03:45 PM 02/01/23 03:45 PM
Joined: Jan 2003 Posts: 75,089 A Banana Republic near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,089 A Banana Republic near you.	Originally Posted by bigdad what ever happened to quicktree .. ? running up my post count some more .

Re: Angle on the rear axel perch [Re: JohnRR] #3118230 02/02/23 08:07 AM 02/02/23 08:07 AM
Joined: Jan 2003 Posts: 8,182 Plymouth, MI Blusmbl master
Blusmbl master Joined: Jan 2003 Posts: 8,182 Plymouth, MI	Originally Posted by JohnRR Originally Posted by bigdad what ever happened to quicktree .. ? x2, I miss a lively pinion angle debate! I just put caltracs and split monos on my car, Calvert's instructions said between 2-4* nose down in relation to the trans. I put a 4* shim on it and it ended up where I needed to be, but now I'm probably replacing the rearend so I'll have to redo it all. '18 Ford Raptor, random motorcycles, 1968 Plymouth Fury III - 11.37 @ 118

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