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#1 |
Registered User
Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,871
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Re: My caster mod (with pictures)
I moved my forward too, a bit differently though:
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
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#2 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,944
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Re: My caster mod (with pictures)
This looks good, I was only able to move mine forward 3/8 inch without modifying my perches or the mount. Until I started I didn't know that there was additional mods needed to move the thing forward. I was not ready to cut into my cross member since I was ready to get back on the road so I only moved it a little. I figured anything would help.
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#3 |
Registered User
Join Date: Apr 2007
Location: Lee Summit, MO
Posts: 16
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Re: My caster mod (with pictures)
I performed this mod tonight on my 72 C10. I was able to move the lower arm forward 1 inch with minimal trimming on the lower arm and cross member, as to not remove too much material from either.
My question now is, it appears the shock is going to contact the cross member. Even if it clears, this mod moves the lower shock mount forward with the lower arm and increases the angle of the shock more than stock, which is not a good thing. What have any of you done to correct this? Side note, I already have the heavy duty upper front shock re-locators from CPP since my upper front shock mounts have already been ripped out and poorly welded by the previous owner. My plan was to mount them in a position to eliminate some of the angle inherent in the front shocks, but I fear with this mod I will limit my options there. I may end up fabbing some customer lower mounts that give me more room to work off of the lower arm... more work... sigh. the things I do for fun. Thanks Walker |
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#4 |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
Walker-
If you can, try to get a front shock angle measurement from a stock truck, or do some math and figure out what yours was in the original configuration. I think that if you take your CPP bracket and slide it forward the same amount you moved the lower arm, you should be just fine. You could extend the lower mount out a little, but I would prefer keeping the lower eyelet of the shock as close to control arm as possible, like the factory did. In your case, I would just mock up the CPP bracket and slide it to where you like it, and drill it up.
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#5 | |
Registered User
Join Date: Sep 2013
Location: Vacaville CA
Posts: 490
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Re: My caster mod (with pictures)
Quote:
Did you ever get alignment specs? I'd like to know how much caster increase you got with the 3/8" movement. Thanks! |
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#6 |
Registered User
Join Date: Jul 2013
Location: Portland, Maine
Posts: 219
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Re: My caster mod (with pictures)
What are the compromises of forcing the spring to be 1" out of alignment when you move the lower arm forward?
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Daily Driver '66 C10 Fleetside Short Bed - LS swap - 4L80E - Accuair eLevel |
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#7 |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
I'm only .75" forward, and I figured that it wouldn't be an issue. The coil spring is approx. 11" tall when under compression, and as long as the pigtails of the spring are locked in the stops, I think it'll be fine.
That is a very good question, though. My truck isn't on the road yet, so I can't give you any "dynamic" feedback.
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#8 |
Senior Member
![]() Join Date: Nov 2010
Location: Honolulu Hawaii
Posts: 313
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Re: My caster mod (with pictures)
Wow! Awesome write up on a ingenious DIY mod!
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#9 |
GEARHEAD
Join Date: Aug 2003
Location: MN
Posts: 6,126
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Re: My caster mod (with pictures)
I've been working on this mod over the past couple weeks as part of a front end rebuild. I moved the LCA's fwd 5/8" ans still had to do some grinding on the U-bolt saddles and on the inside radius of the LCA near rhe saddle for full up travel. No big deal. But I am having issues with the shocks. I still have the stock shock mounts on my 71 and the angle on the bottom is too much to get the bolt in.
Have you installed shocks on yours yet? Are they the same mounting style as the 67-72? I have been considering getting the CPP mounts or the kind ORD sells for extending the upper mounting on 4x4's, or just making my own upper mount. The simplest fix would be to just open the hole up a bit to get the bolt to slide in. I like the idea of the higher mount point in any case since my truck is lowered with shorter coils about 3.5". Here's where I'm at now... ![]()
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If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 ![]() 72 ![]() HG's Plow Truck '78 ![]() Bigass Farm Truck HG's thread of miscellaneous stuff |
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#10 |
Registered User
Join Date: Apr 2008
Location: Oregon City, Oregon
Posts: 741
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Re: My caster mod (with pictures)
I did this mod last year. My truck drives absolutely awesome around town or on the freeway. We got similar results (+7* caster). I've done some "testing
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#11 | |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
Quote:
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#12 | |
Registered User
Join Date: Apr 2008
Location: Oregon City, Oregon
Posts: 741
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Re: My caster mod (with pictures)
Quote:
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#13 |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
I haven't installed my shocks yet, but it looks like they should work. I even bought the upper shock mounts from CPP, but I couldn't use them because I did all of the work on my inner fenders and they wouldn't clear. I Z'd my chassis 2" and did a bunch of work on the inner fenders to make it all look factory. On a stock chassis with stock inner fenders, the mounts would have worked just fine. Once I get all of my rear suspension work completed, I'll install the front shocks and see if everything is going to be OK.
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#14 |
GEARHEAD
Join Date: Aug 2003
Location: MN
Posts: 6,126
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Re: My caster mod (with pictures)
__________________
If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 ![]() 72 ![]() HG's Plow Truck '78 ![]() Bigass Farm Truck HG's thread of miscellaneous stuff |
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#15 |
Registered User
![]() Join Date: May 2011
Location: Missoula, MT
Posts: 934
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Re: My caster mod (with pictures)
nice fix!
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69 GMC C10 build thread- http://67-72chevytrucks.com/vboard/s...d.php?t=501676 03 Silverado build thread-http://67-72chevytrucks.com/vboard/s...d.php?t=591582 |
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#16 |
Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: My caster mod (with pictures)
I just changed engine and trans (LQ4/4L60E) on my 78 and drove it around the block. everything works great but the steering feels like super power steering, very light feeling.
The pump on the new engine is a 2003 5.3 so is there any difference in pressure to make the steering feel so "light". I need to replace the bushings on the LCA so this thread is right on time! When complete with this mod and gaining more castor is that going to change the feeling of the light steering? The truck already has 2" spindles and springs have a coil cut, but I don't remember it feeling this "light" I did not read any more about this mod changing the Ackerman or the steering links, is that going to be a concern by moving the shaft .75"? Thanks for all the great wright ups and pics.
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#17 | |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
Quote:
Not sure about the Ackerman change, but the movement of the LCA .75" forward is not going to move the tie rod attach point on the spindle hardly at all. If anything, it'll roll the attach point to a very slightly rearward angle, but will be compensated by the tie rod adjustment and have no affect.
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#18 |
Registered User
Join Date: Apr 2011
Location: Pocahontas, AR
Posts: 554
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Re: My caster mod (with pictures)
Thanks for the awesome write up! Like everyone I can't leave well enough alone and have been thinking about doing this. But has anyone done this with the nonrubber bushing a arms? I just changed the ball joints and spindle to a '79 suburban for disc. Is there an advantage with the new arms with bushings?
Chris
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1966 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=615165 1968 GTO http://67-72chevytrucks.com/vboard/s...=1#post7650182 |
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#19 | |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
Quote:
Not sure what you mean by non-rubber, but I'm thinking you're meaning polyurethane? I used Energy Suspension bushings on my lower control arms, and it went together just fine. I've had good success with their products in the past, so I used them again. I used all 1979 suspension components for my truck as well. I got a 1/2 ton Suburban and swapped out the entire front suspension and the 12-bolt rear end.
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Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#20 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,132
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Re: My caster mod (with pictures)
Quote:
Which is better depends on what you seek (performance or cushy ride quality).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#21 | |
Registered User
![]() Join Date: Mar 2005
Location: apple valley, ca
Posts: 2,670
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Re: My caster mod (with pictures)
Quote:
__________________
Check out my latest endeavor: https://roundsixpod.com My build threads: '55 Chevy: http://67-72chevytrucks.com/vboard/s...d.php?t=247512 '64 C-20: http://67-72chevytrucks.com/vboard/s...d.php?t=446527 |
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#22 |
Registered User
Join Date: Apr 2011
Location: Pocahontas, AR
Posts: 554
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Re: My caster mod (with pictures)
Sorry guys yea. Still original '66 a arms. I kinda thought they might have a little less deflection, but didn't know if I was missing something. I've always been a fan of a stiff suspension unless its a drag car. Would like to go a more pt route with this truck.
Chris
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1966 C10 http://67-72chevytrucks.com/vboard/s...d.php?t=615165 1968 GTO http://67-72chevytrucks.com/vboard/s...=1#post7650182 Last edited by ChrisDollins; 04-08-2014 at 10:45 PM. |
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#23 |
Registered User
Join Date: Jul 2013
Location: Essex
Posts: 950
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Re: My caster mod (with pictures)
Gentlemen,
Thank you for a very informative post. I wonder if you could clarify one point for me. Would this same modification work on 66 LCA's? Or is something else required? Many thanks. P. ![]() |
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#24 |
Registered User
Join Date: Dec 2002
Location: Cactus Patch So. Az
Posts: 4,749
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Re: My caster mod (with pictures)
Chevyrestroguy, Any updates on your truck!
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53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42 |
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#25 |
Registered User
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,302
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Re: My caster mod (with pictures)
I'm mocking my parts up to do this mod but it looks like my lca only has .5" before it will hit the saddle during travel. Tons of space everywhere else, just the part of the lca that kicks out will be hitting. Has anyone run into this? The suspension is stock '72 so far.
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1968 LWB C20 / AC / Wood Bed |
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