Re: Cal Trac springs
[Re: cudaman1969]
#3231202
05/05/24 06:15 PM
05/05/24 06:15 PM
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Joined: Dec 2004
Posts: 10,555 Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
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Posts: 10,555
Rittman Ohio
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I set mine at 3 degrees down when I ran CalTracs. Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: Cal Trac springs
[Re: AndyF]
#3231217
05/05/24 07:26 PM
05/05/24 07:26 PM
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Joined: Aug 2011
Posts: 2,864 Pattison Texas
CSK
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master
Joined: Aug 2011
Posts: 2,864
Pattison Texas
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I run mine 1 deg down from parallel to the trans, work great
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Cal Trac springs
[Re: CSK]
#3231220
05/05/24 07:33 PM
05/05/24 07:33 PM
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Joined: Dec 2013
Posts: 4,685 Wichita
GY3
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master
Joined: Dec 2013
Posts: 4,685
Wichita
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I'm at 4° down. Nickel width air gap at rest. Bars in bottom hole. Upper shock mount moved to framerail to get them as vertical as possible.
Has been 1.36 60 ft. on a 275 drag radial.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Cal Trac springs
[Re: GY3]
#3231237
05/05/24 08:54 PM
05/05/24 08:54 PM
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Joined: Jan 2004
Posts: 8,290 fredericksburg,va
cudaman1969
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OP
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Posts: 8,290
fredericksburg,va
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I'm at 4° down. Nickel width air gap at rest. Bars in bottom hole. Upper shock mount moved to framerail to get them as vertical as possible.
Has been 1.36 60 ft. on a 275 drag radial. Nice
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Re: Cal Trac springs
[Re: AndyF]
#3231240
05/05/24 09:01 PM
05/05/24 09:01 PM
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Joined: Jan 2004
Posts: 8,290 fredericksburg,va
cudaman1969
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Are you just using the CalTrac springs, or do you have the full CalTrac suspension? When you use the Calvert suspension setup with the lower bars you don't need much pinion angle since the rear end doesn't rotate much. If you use their springs without the bars then you would nee a bunch more pinion angle. Whole setup, “doesn't rotate much” what I wanted to hear. Amazing how ‘off’ the suspension is, to get rear square to car I had to move axel spring perch back on pin 1/8” (right side was more forward)
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Re: Cal Trac springs
[Re: cudaman1969]
#3231283
05/06/24 05:41 AM
05/06/24 05:41 AM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
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A shed in England
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5 degrees down, car gets a LOT of axle rotation, it's why we have the wheelie bars set so high (the bars are for safety not tuning). This is something I have seen on many mopars using that type of wheelie bar, the big mistake is they are set too low and it unloads the tyre at the hit. The car has been 1.29, (1.34 on the back wheels) 60ft @ 4000lb + with a 29.5 x 10.5 radial slick. Watch the vid below 1/4 time and you will see what a typical launch is like and how the rear reacts. (F/F to 40 sec in to miss the staging stuff ) https://www.youtube.com/watch?v=8iUhVr2rxm0
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Cal Trac springs
[Re: Tig]
#3231307
05/06/24 09:14 AM
05/06/24 09:14 AM
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Joined: Jan 2003
Posts: 13,373 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Posts: 13,373
Marion, South Carolina [><]
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Mine is 3° down relative to the trans. Calvert recommends 2-3° if I'm not mistaken.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Cal Trac springs
[Re: cudaman1969]
#3231338
05/06/24 11:07 AM
05/06/24 11:07 AM
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Joined: Jan 2003
Posts: 31,050 Oregon
AndyF
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I Win
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Posts: 31,050
Oregon
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Are you just using the CalTrac springs, or do you have the full CalTrac suspension? When you use the Calvert suspension setup with the lower bars you don't need much pinion angle since the rear end doesn't rotate much. If you use their springs without the bars then you would nee a bunch more pinion angle. Whole setup, “doesn't rotate much” what I wanted to hear. Amazing how ‘off’ the suspension is, to get rear square to car I had to move axel spring perch back on pin 1/8” (right side was more forward) Calvert recommends 2 to 3 degrees of pinion angle with the bars parallel to the ground and a small gap. Need to put weight in the driver seat when making your adjustments.
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Re: Cal Trac springs
[Re: CSK]
#3231421
05/06/24 03:17 PM
05/06/24 03:17 PM
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Joined: Aug 2011
Posts: 2,864 Pattison Texas
CSK
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Pattison Texas
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I run mine 1 deg down from parallel to the trans, work great The reason I run mine only 1deg down from trans is it works great SO FAR at launch, BUT if I go down more on the pinion I get a driveline vibration at a light cruise 70mph & up,, Street car problems LOL , I have OD trans & a 4.10 gear with a short driveshaft its very sensitive to the angles, smooth as glass the way I have it now that I have a Mark Williams driveshaft
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Cal Trac springs
[Re: cudaman1969]
#3231426
05/06/24 03:36 PM
05/06/24 03:36 PM
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Joined: Jan 2003
Posts: 4,733 Moved to N.E. Tennessee
GomangoCuda
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Joined: Jan 2003
Posts: 4,733
Moved to N.E. Tennessee
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From Calvert's faq
What pinion angle works best? We suggest a pinion angle to be between 2-4 degrees negative, measuring off the transmission yoke and pinion yoke.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: Cal Trac springs
[Re: AndyF]
#3231433
05/06/24 05:29 PM
05/06/24 05:29 PM
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Joined: Jan 2004
Posts: 8,290 fredericksburg,va
cudaman1969
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Are you just using the CalTrac springs, or do you have the full CalTrac suspension? When you use the Calvert suspension setup with the lower bars you don't need much pinion angle since the rear end doesn't rotate much. If you use their springs without the bars then you would nee a bunch more pinion angle. Whole setup, “doesn't rotate much” what I wanted to hear. Amazing how ‘off’ the suspension is, to get rear square to car I had to move axel spring perch back on pin 1/8” (right side was more forward) Calvert recommends 2 to 3 degrees of pinion angle with the bars parallel to the ground and a small gap. Need to put weight in the driver seat when making your adjustments. What I always did. We had horses back in the day and wife bought 50 pound bags of feed, I put 5 bags in the driver seat then adjust the weight and 4 link bars. I did a lot of freebies back then all the buddies cars, rears, suspensions, motors and trans, but just a hobby
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Re: Cal Trac springs
[Re: 340Cuda]
#3231434
05/06/24 05:31 PM
05/06/24 05:31 PM
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Joined: Jan 2004
Posts: 8,290 fredericksburg,va
cudaman1969
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As you can tell from the responses there seems to be a pretty wide range of what will work. Mine have been on so long I don't remember what the pinion angle was set at.
If you want to know for sure what might be best for your car give Calvert a call, their customer service is top notch.
Cool to see you are building a F/SA car! Keep us posted on your progress and let us know when you get it on the track. Thanks, if I don’t get it done soon time will pass me by, old folks home calling me every month. lol Bad part I’m getting rotator surgery next week then 4 months later the other shoulder, to much lifting and falling!
Last edited by cudaman1969; 05/06/24 05:33 PM.
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