Need help can't 60' - Lightning Forum | LightningRodder.com
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post #1 of 48 (permalink) Old 09-30-2017, 02:51 PM Thread Starter
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Need help can't 60'

The story:
2004 L didn't like ride height so installed hangers and shackles changed to QA1's 706 from 906. Had roll bar installed and the outriggers were making metal to metal contact on launch, so I had to raise the rear. Put shackles in top setting and went from 28" tires to 30". Increased rear height somewhere around 3-4 inches. Terrible traction problems at the strip and have been adjusting shocks ever since. To get any kind of traction I have to tighten front and rear settings. I believe the shocks may be bottoming out on launch and 1-2 shift. I do hear metal contact on those shifts.


Height from floor to top lip of rear fender is 32"
Height from floor to center of wheel is 15"
Shock is about 17" from bottom eyelet to bottom of mounting point with about 4-5" of the rod showing.


I'm thinking that going back to 906's may solve the problem and may even go DA.
What do you think?


2004 Silver Born 10/22/03
Built motor, TF heads, Whipple 2.3, 3,25U 8#L, Fore hat 465's FC2, 8AN lines, DW 1200's, Metco rails, WeaponX coils, Stifflers long bars, DS loop, Acufab SBTB, BA2800, Truetrac, QA1's, Harley 356 drag kit battery in bed, JLP intercooler box, Race Stars, 11" Circle D converter, J&S Vampire, Killer Chiller, ARH full 3 inch exhaust, E85, 656hp/665tq Tuned by JJ@WMS.
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post #2 of 48 (permalink) Old 09-30-2017, 07:15 PM
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Tie a zip tie around the shaft of all 4 shocks. Just before a run push them down against the shock body.

They will stay where ever they compress to. Easy to tell if they bottom out.
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post #3 of 48 (permalink) Old 09-30-2017, 08:39 PM
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If you bottom out the suspension it will unload the tires..
What do you have your pinion angle set at?
Post a picture of the diff yoke.
What kind of leaf springs an traction bars do you have?
Try what mizlplix said...

The foot say's go, The light say's no!
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post #4 of 48 (permalink) Old 09-30-2017, 09:51 PM
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pinion angle?

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post #5 of 48 (permalink) Old 09-30-2017, 10:27 PM
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Quote:
Originally Posted by stoffer View Post
pinion angle?
You never want the pinion angle to go positive (nose up).
I learned mine by attaching a GoPro to the traction bar and recording the pinion angle movement. Had some custom shims made...
Pinion Angle - Wolfe Race Craft
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post #6 of 48 (permalink) Old 10-01-2017, 05:00 AM
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Quote:
Originally Posted by Certified Drunk View Post
You never want the pinion angle to go positive (nose up).
I learned mine by attaching a GoPro to the traction bar and recording the pinion angle movement. Had some custom shims made...
Pinion Angle - Wolfe Race Craft
Sir,
Back years ago, Mr. Gasket made shims. 2 or 3 different degrees types. I'm not sure if they still do.

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post #7 of 48 (permalink) Old 10-01-2017, 08:13 AM
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Garage
https://m.summitracing.com/parts/sum-770025

These may be in your future?
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post #8 of 48 (permalink) Old 10-01-2017, 09:21 AM
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Post videos from the side of it launching.

Just a Randy Smith and Tuned by norm Lightning....

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post #9 of 48 (permalink) Old 10-01-2017, 09:43 AM Thread Starter
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Pinion angle is 0, I will change it to -2. Now that I think about it after the burnout I did hear a faint clunk.
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File Type: jpg pinion.jpg (224.8 KB, 146 views)


2004 Silver Born 10/22/03
Built motor, TF heads, Whipple 2.3, 3,25U 8#L, Fore hat 465's FC2, 8AN lines, DW 1200's, Metco rails, WeaponX coils, Stifflers long bars, DS loop, Acufab SBTB, BA2800, Truetrac, QA1's, Harley 356 drag kit battery in bed, JLP intercooler box, Race Stars, 11" Circle D converter, J&S Vampire, Killer Chiller, ARH full 3 inch exhaust, E85, 656hp/665tq Tuned by JJ@WMS.
10.95 @ 124
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post #10 of 48 (permalink) Old 10-01-2017, 10:31 AM Thread Starter
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Any ideas what to do with this mess? Left side facing forward. Shim has big side toward front.
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File Type: jpg shims.jpg (235.6 KB, 145 views)


2004 Silver Born 10/22/03
Built motor, TF heads, Whipple 2.3, 3,25U 8#L, Fore hat 465's FC2, 8AN lines, DW 1200's, Metco rails, WeaponX coils, Stifflers long bars, DS loop, Acufab SBTB, BA2800, Truetrac, QA1's, Harley 356 drag kit battery in bed, JLP intercooler box, Race Stars, 11" Circle D converter, J&S Vampire, Killer Chiller, ARH full 3 inch exhaust, E85, 656hp/665tq Tuned by JJ@WMS.
10.95 @ 124
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post #11 of 48 (permalink) Old 10-01-2017, 10:38 AM
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The video...., you can see the nose climb.


Toss those OEM top plates in to the trash, Get a set of these...Same one's I'm using.
2.5" Spring Plates, Pair | Leaf Spring Plates | WFOConcepts.com


Those look like Stifflers long bars, Weld a stop on the back side.
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File Type: jpg IMG_0637.jpg (173.5 KB, 144 views)

The foot say's go, The light say's no!
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post #12 of 48 (permalink) Old 10-01-2017, 01:38 PM Thread Starter
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Ordered the plates. What about shims or correcting the angle, already have that big one in there. The Stifflers were welded but the right side broke the weld and the left mount is welded to the axle tube and is not perpendicular.


2004 Silver Born 10/22/03
Built motor, TF heads, Whipple 2.3, 3,25U 8#L, Fore hat 465's FC2, 8AN lines, DW 1200's, Metco rails, WeaponX coils, Stifflers long bars, DS loop, Acufab SBTB, BA2800, Truetrac, QA1's, Harley 356 drag kit battery in bed, JLP intercooler box, Race Stars, 11" Circle D converter, J&S Vampire, Killer Chiller, ARH full 3 inch exhaust, E85, 656hp/665tq Tuned by JJ@WMS.
10.95 @ 124
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post #13 of 48 (permalink) Old 10-02-2017, 11:13 AM
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If your pinion angle is 0 now with those shims you may need a higher (Thicker) degree shim. They come I believe 2, 4 and 6 deg. For sure weld those Stiffler brackets. The axle will rotate on them with higher HP trucks. That could be why your pinion angle is 0 with shims. It should be like -2 so when you launch it goes to 0. The drivers side bracket looks to be slightly rotated to the rear. Is the truck launching straight?
What are you 60ft times and mods?

If you are bottoming out the shocks you either have the wrong shocks or you are way too loose on settings. 12 way or 18 way and what are they set at? Did you have shock extenders on at one point?

The WFO plates will let you crank down hard on those bolts. I tried torquing mine down good and bent the stock plates.

Basically you need to remove all the Stiffler bars and loosen the brackets. With the truck sitting on all 4 wheels, set the shims in and tighten down the brackets and u bolts. If your pinion angle is not negative change to a larger shim. Once you have the angle correct weld in the Stiffler brackets and install bars. Bars should be loaded hand tight on adjustment.

Hope this helps!!
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post #14 of 48 (permalink) Old 10-02-2017, 11:18 AM
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Can you take a pic of both sides of the Stiffler bracket connection? The one seems way far back.

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post #15 of 48 (permalink) Old 10-02-2017, 11:27 AM
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If you have a magic number you are shooting for with pinion angle, how are you certain youll get there without knowing what the rear end does when he launches? I didnt see a video of his rear end during a track launch at all specifically from under the truck.

Unless im missing something. It's attempting to copy what works for someone else's truck when there is no idea what the truck needs.

Just a Randy Smith and Tuned by norm Lightning....

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