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#26 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,982
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Quote:
I could see a problem if someone used incorrect backspacing, but I feel you would see the same issue irregardless of year model (ex: a 72 w/incorrect backspace is just as bad as a 73 w/incorrect backspace). I can say this w/some measure of confirmation since I own both a 68 & a 74; both lowered w/spindles. The control arms are slightly different as far as bushings, yet similar enough dimensionally to be a valid comparison. The main consideration is trucks that utilize spindles for lowering require different offsets than those dropped using modified arms or cut springs. My 68 doesn't rub @ all using the stock 68 control arms w/73-up drop parts & stock offset 15x6" van ralleys (4" b.space). My 74 does rub the arms @ full lock on the steering, but it has 18x8" wheels w/5.25 b.space. Is your truck lowered? What parts did you use? Where did it rub? I'm curious if I was just lucky or if there's something I haven't considered when giving advice.
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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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#27 |
Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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do controll arms and spindles change anywhere in the 73-87 era? i went to a local drop shop and he told me that 67-87 arms are close enough to work properly when swaped. just make sure you maintain the right year parts. and he also told me that in 81 there is two different spindle sizes on 1/2 tons, a light duty and a heavy duty. just wondering if anyone else has heard that?
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's ![]() 1993 Cherokee work ride/weekend wheeler |
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#28 |
faster, faster, faster
Join Date: Dec 2001
Location: Houston ,Texas ,USA
Posts: 1,354
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Well, the issue is not back spacing, it's the 3" drop spindles and 2" drop springs. It could also be the belltech crap spindles the PO used. But I know for sure the rims are not the problem. My 18x8.5's do not rub, but the PO's 17's did, and so did a set of stock ralley wheels. Just use the right year stuff and don't be cheap.
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I'm going to Law School, wanna debate? It's good practice. |
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#29 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Wheel backspacing, & also the amount of drop on the spindle can cause problems. Many of the drop spindles listed for the 73 up trucks are a 3" drop(Belltech for one). the extra drop can cause problems with some wheels depending on offset. Honestly, using the later spindles should not be a problem....crazyL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#30 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Quote:
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#31 | |
Got Light Emitting Diode?
Join Date: Apr 2004
Location: Newberg, OR
Posts: 2,485
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Quote:
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1968 1/2 ton 2wd lwb 6 lug disc and bags up front. Next c notch and rear bags '02 Chevy Silverado LT ext cab short bed 2WD 5/7 drop on 22's ![]() 1993 Cherokee work ride/weekend wheeler |
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#32 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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just use the ball joints/ tierods for the yr of the spindle that you use. Best of luck, crazyL
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#33 |
Registered User
Join Date: Dec 2002
Location: Magnolia, Texas
Posts: 336
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I did the 4-1/2" and 4" drop on my '72 and the ride is better than original. I agree with everyone else. Don't do it cheap - do it right the first time.
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'72 Chevy Cheyenne Super, '56 Chevy Bel Air,'56 Chevy Nomad, '61 Chevy Impala, '64 Cadillac Fleetwood, 1966 Thunderbird Convertible |
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#34 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,982
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Quote:
I don't see what difference the year-model parts you use make in your reference to "being cheap". The difference is only between 2.5" & 3" spindles. The later 73-up a-arms actually ride smoother thanks to the newer rubber bushings vs. the older solid/rubber lined bushings & are easier to find in wrecking yards. What is the back space of your 18x8.5's vs. the PO's 17's?
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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. Last edited by SCOTI; 06-29-2004 at 06:43 PM. |
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#35 | |
Registered User
Join Date: Jun 2004
Location: Oregon
Posts: 12
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Quote:
hope that helps. ![]() |
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#36 |
Senior Member
Join Date: May 2004
Location: Seaside, Oregon
Posts: 1,789
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Hey everybody, thanks for all of the information and replies. I think I'm just gonna bite the bullet and do it the right way.
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-Greg My Chevy trucks, past and present: 1962 C10 SB Fleetside 1964 C10 LB Fleetside BBW 1966 C10 SB Fleetside 1966 C10 SB Fleetside BBW 1968 C10 SB Fleetside 1971 C10 LB Fleetside 1971 C10 SB Fleetside 1972 C10 SB Fleetside Cheyenne 1972 C10 SB Fleetside Cheyenne Super 1972 C10 LB Fleetside Cheyenne Super 1974 C20 Cheyenne 1979 K5 Blazer Cheyenne 1982 K10 SB Fleetside Custom Deluxe 1982 K10 SB Fleetside Scottsdale 1986 C10 SB Fleetside Silverado 2008 Silverado 1500 4x4 |
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#37 |
Cowboy Fan for Life!!!!!!
Join Date: Apr 2002
Location: Amelia, Virginia
Posts: 2,921
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"Hey everybody, thanks for all of the information and replies. I think I'm just gonna bite the bullet and do it the right way."
You won't regret it........Jerry
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1967 ShortBed Fleetside 3/4 Drop 350/700R4 Tilt wheel 18 x 8 Torque Thrust II's Future mods: All new gauges & wood bed My Zip is 23002 I ship UPS, USPS |
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#38 | |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Quote:
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#39 |
GEARHEAD
Join Date: Aug 2003
Location: MN
Posts: 6,122
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I did mine the simplest way I knew how back in 1987. I bought a new set of springs already calibrated for a 3.5" drop. I just replaced the springs all around, replaced the snubbers up front and I've been driving it ever since. I added a front sway bar from a 72 a short time later, not because I felt I needed it,m just because I wanted it. It did improve the handling through the corners though. It has one of the best rides I've ever had. I'm normally driving Tauruses and Impalas, etc for work, wife has a suburban, and this rides better hands down. It still has the shocks I bought before the drop. They were only a year or two old when I dropped it, so I left them. I still haul heavy loads with no problems and I pulled a boat for a while that was a 20 footer and weighed over 3000 lbs.
Now I'm afraid to "upgrade" to dropped spindles and slightly shorter springs because I'm afraid it will mess up the ride quality I've grown to love. The only things I want to do now is add about a 1" lowering block to the rear and replace all the bushings, etc and replace the shocks. I'm riding on Goodyear Eagle GTII's, 235-70-15 up front, 275-60-15 rear. I chose them because they had the highest load rating for the style and size when I was shopping, which was when I was pulling the boat. They have a stronger sidewall and so I think it effects the ride on the taller tires so its not so squishy feeling. Good luck with your project. One thing to remember is that if you're not happy with it after a change, you can always make another change. Parts can be replaced and sold. HG
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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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#40 |
Registered User
Join Date: Dec 2002
Location: Fort Wayne, IN
Posts: 108
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I would not recommend cutting coil springs as it would change the spring rate and change handeling.
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Save your money and do it right the first time. 1968 GMC short bed 1972 Cab 74 SB Chevy running gear |
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