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#1 | |
Registered User
Join Date: Jun 2011
Location: Richmond,Va
Posts: 2,934
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Re: My caster mod (with pictures)
Quote:
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#2 | |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,133
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Re: My caster mod (with pictures)
Quote:
That being said, the aligned set-up is the currently available Porterbuilt 1" forward lower a-arms so the lower BJ's are 1" forward of the OE location.
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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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#3 |
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Location: apple valley, ca
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Re: My caster mod (with pictures)
Excellent caster numbers, Scoti!!
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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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#4 |
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Join Date: Jun 2011
Location: Richmond,Va
Posts: 2,934
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Re: My caster mod (with pictures)
I'm trying to gauge this before I hit the rack . Did you happen to print out your before and after sheet? Given input from guys who have done the mod it would seem that for every 1/4" the index is moved its worth about 1° of Caster. If your alignment was about 2.5 and 3.0 without shims before the alignment that would solidify my thinking. Not taking anything away from Rob because his track record is proven but I think we need to get away from the .75" measurement and start measuring from the end of the shaft. Anyone who has pre-mod (non-shimmed) specs could redrill their shafts to have equal caster once it hits the rack.
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#5 |
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Join Date: Jun 2011
Location: Richmond,Va
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Re: My caster mod (with pictures)
It would seem that this has turned into a lot of research but I think the answers will be worth it. Any guy on a budget will be able to modify the stock stuff and make vast improvements on how his/her truck performs.
FWIW, my progress is slow but I work and research (watching everyone here) to figure this out. 1/4" of movement for 1° of caster is fuzzy numbers at this point but lets step that up one notch. If 1/4" is worth 1° on the bottom why not machine the uppers 1/8th" to have the extra .5" movement to equalize caster on both sides? Again, all research and little to no development at this point but I'm thinking. You would only end up shimming to equalize camber at that point. Then again you could machine the uppers down to equalize camber. Certainly, there is a time when all that machine work adds up and it may be worth it to pay the money for tubulars but then you are still at the mercy of the guy manning the alignment rack.
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#6 | |
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Join Date: Sep 2013
Location: Vacaville CA
Posts: 490
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Re: My caster mod (with pictures)
Quote:
Uppers back is a good idea, too. Before I found these threads I was only thinking of lowers forward cuz I also wanted to move the wheel forward in the well, mainly for cosmetics. Obviously, uppers back would negate a little of this, but I'd take 6 degrees over a perfectly centered wheel! |
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#7 | |
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Join Date: Jun 2011
Location: Richmond,Va
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Re: My caster mod (with pictures)
Quote:
![]() ![]() I have been thinking about elongating the upper cross shaft locating holes for finer adjustments, leaving the shims only for camber adjustments (1/8" of motion would equal .5 degrees of movement). I need to go back and look over your math and Scoti's alignment numbers.
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#8 | |
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Location: Missoula, MT
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Re: My caster mod (with pictures)
Quote:
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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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#9 | |
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Join Date: Jun 2011
Location: Richmond,Va
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Re: My caster mod (with pictures)
Quote:
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#10 |
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Join Date: Jun 2011
Location: Richmond,Va
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Re: My caster mod (with pictures)
Thanks Scoti!! You have provided me with a wealth of info. Given your before and after numbers along with the shims installed I have almost too much info to process. Now if this was my only job. From now on thats how I want everyone to report their results! Ha! I know your truck is a dually but its not far from getting us where we need to be. Soon enough we'll be talking about relocating tie rods and sectioning crossmembers and the lower crossshaft thing will be a non-issue because we'll have that part sorted. Between the math and the real world results its almost a done deal. If you can get your stock index numbers that would be great, if not then its no big deal. I have a feeling 67-72 guys will end up at different numbers than the 73-87 guys. Itd be great to get this down to 1/8" but frame and crossmember differences will be the end result. Someone will end up with a graph (probably not me) that charts this whole thing out and everyone will have the recipe to get their truck done right.
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#11 |
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Re: My caster mod (with pictures)
I have become quite fond of this thread as of late, probably because I am at this point in my build and I wanted to say thank you all for being a part of this growth and development to improve our vehicles.
I know there is some discrepancy in the OE and aftermarket lower shaft index holes and I Just wanted to share what I removed from my truck last night. As far as I can tell from the amount of play on the ball joints and the shaft bearings coupled with speaking to the brother and mechanic of the long term owner of the truck my lower shafts on my 72 are original. The hole is indexed 1 1/2" back from where the shaft decreases in diameter to accept the arm (photo may be deceiving). I will post numbers on what my moog replacement shafts come indexed to and then have them re-indexed with 2 or 3 longer indexed hole locations for adjustment at a machine shop.
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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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#12 |
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Location: Vacaville CA
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Re: My caster mod (with pictures)
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#13 |
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Join Date: Aug 2015
Location: Farmington Hills
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Re: My caster mod (with pictures)
The pictures below are of my recently delivered CPP lower shafts. As you can see the indexing holes are already at 2" from where the shaft drops in diameter.
These will be going on an '87 2wd, should I bother getting holes drilled at 2.25"? |
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#14 | |
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Join Date: Mar 2014
Location: Cambridge, Ontario
Posts: 507
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Re: My caster mod (with pictures)
Quote:
I think all of these measurements would be best taken from the centre of the LCA shaft. That way, we could accurately compare any type of LCA shaft. Like this...
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#15 | |
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Join Date: Dec 2009
Location: Kirkland, WA
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Re: My caster mod (with pictures)
Quote:
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1968 LWB C20 / AC / Wood Bed |
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#16 |
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Join Date: Mar 2013
Location: Lakeside, Ca.
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Re: My caster mod (with pictures)
What is the distance from hole to hole center? The factory ones are around 8.xx inches. Where as the pins are 9"
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#17 |
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Join Date: Aug 2015
Location: Farmington Hills
Posts: 20
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Re: My caster mod (with pictures)
I'll check when I get home. Does this influence anything, I thought only one end indexed in the the frame member?
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#18 |
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Join Date: Jun 2011
Location: Richmond,Va
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Re: My caster mod (with pictures)
Only one does from the factory. What box did those shafts come in?
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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#19 |
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Join Date: Aug 2015
Location: Farmington Hills
Posts: 20
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Re: My caster mod (with pictures)
So these will be going on a 1/2 ton '87 R10 so will have the rubber bushings.
The holes are 8.75 inches apart, 4.375 inches from the centerline of the shaft. I have included a picture of the box they came in. I checked the shafts that came out of these lower control arms and they appear to be the exact same measurements, distance from the ends as well as distance from each other. Am I missing something here, are the majority of the 1.5 inch measurements I've seen on this site from 72 and older trucks, or 3/4 ton trucks with steel bushings? Any insight would be greatly appreciated. |
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#20 | |
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Location: Missoula, MT
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Re: My caster mod (with pictures)
Quote:
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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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#21 |
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Re: My caster mod (with pictures)
I have a 64 with Steel Bushings, here are my measurements before drilling on a stock unit:
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Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats? |
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#22 |
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Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,302
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Re: My caster mod (with pictures)
I got my bag mocked up, but it looks like it'll have stress in bad places. Then again, I've never run bags. Anyone know if the offset pictured will cause more than a marginal decrease in bag life? I also have no idea what the internal bumpstops on these bags look like. I'm a little worried that they aren't making solid contact as pictured.
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1968 LWB C20 / AC / Wood Bed |
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#23 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 22,133
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Re: My caster mod (with pictures)
Quote:
I would make new uppers or re-drill the holes accordingly to keep the bag as straight as possible @ ride height.
__________________
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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#24 | |
Registered User
Join Date: Dec 2009
Location: Kirkland, WA
Posts: 1,302
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Re: My caster mod (with pictures)
Quote:
Yeah, shifting them forward seems like the best option at this point -- I should have waited on painting the plates! I wish I had just fabbed up some plates for the lower control arms now though, because then I could put the bags wherever I wanted them. I did find a cutaway of the SS bags though and the bumpstop looks like it covers the entirety of the bag top/bottom, being a non-issue.
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1968 LWB C20 / AC / Wood Bed Last edited by crakarjax; 10-26-2015 at 04:48 PM. |
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#25 | |
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Join Date: Aug 2017
Location: Chicago,il
Posts: 361
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Re: My caster mod (with pictures)
Quote:
Anyway, you were one of the only ones to mention bags. I too am using air and wondered how well you solved the issue of the crooked bag? Did you just relocate the mount holes in the top bag bracket? I actually cut out the lower indent section of my lca and welded in pockets to the entire bag will now sit in the pocket when completely deflated. This also allows me to run with more air in the bags at a lowered ride height. I’m wondering if this is going to affect or alter my attempt at this modification? |
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