The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-11-2019, 04:06 PM   #1
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Static Drop

Friends, I am going to installing a 2.5/4 inch drop on my 81 C10 over the Holidays and would love some pro tips before starting. here are the plans and parts i currently have:

Front:
2.5 drop spindles
stock replacement coil springs
New ball joints
Stock replacement shocks (didnt think i needed lowering shocks due to spindle)
Sway bar
Should i replace the bushings in the control arms? (i have not purchased new ones yet)

Rear:
2 in hangers
2 inch shackles
Drop shocks or stock? (havent purchased yet)
Should i replace the bushings in the leaf springs? (havent purchased yet)

This will be my first time doing this so any info is helpful!

Thanks!
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 12-11-2019, 07:49 PM   #2
wixthedog
Junior Member
 
wixthedog's Avatar
 
Join Date: Sep 2019
Location: Magnolia, TX
Posts: 88
Re: Static Drop

I am a fan of refreshing and making things 'new' whenever I get into them. That being said, I would definitely replace what was needed while you are in there.
__________________
Mike
1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop
Obligatory Build Thread HERE!
1979 C20 RCLB - 350 - TH350 Auto
wixthedog is offline   Reply With Quote
Old 12-13-2019, 10:37 AM   #3
SCOTI
Registered User
 
SCOTI's Avatar
 
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 18,319
Re: Static Drop

Bushings are likely toast if it's been used & not a yard queen (the last Square trucks built are 40yrs old now). inspect them & plan accordingly. Your plan for the front seems good & you're correct the shock travel won't change w/the spindle swap.

For the rear, same rules apply for the leaf bushings. I would opt for relocating the lower shock mounting point w/shock extension brackets to get a better angle on the shocks & to allow using stock spec replacement shocks vs. 'drop' shocks.

When you get it aligned, the 'book' will call for +.5 Camber. Request 0 (zero) to -.5 Camber & as much Caster as they can dial in w/that new Camber set-point. The lower center of gravity & updated camber spec will be an improvement.

Check the other steering parts while you're in there. The tie-rod ends, Idler, & Pitman arms need to be in good shape as well. Summit Racing offers the Moog product line & they're usually 50% less than your local parts place on the price.
__________________
67SWB-B.B.RetroRod
64SWB-Recycle
89CCDually-Driver/Tow Truck
99CCSWB Driver
All Fleetsides

Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.

Cubic inches is like Indiana Jones with a cheap pistol....
SCOTI is offline   Reply With Quote
Old 12-13-2019, 11:02 AM   #4
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

Quote:
Originally Posted by SCOTI View Post
Bushings are likely toast if it's been used & not a yard queen (the last Square trucks built are 40yrs old now). inspect them & plan accordingly. Your plan for the front seems good & you're correct the shock travel won't change w/the spindle swap.

For the rear, same rules apply for the leaf bushings. I would opt for relocating the lower shock mounting point w/shock extension brackets to get a better angle on the shocks & to allow using stock spec replacement shocks vs. 'drop' shocks.

When you get it aligned, the 'book' will call for +.5 Camber. Request 0 (zero) to -.5 Camber & as much Caster as they can dial in w/that new Camber set-point. The lower center of gravity & updated camber spec will be an improvement.

Check the other steering parts while you're in there. The tie-rod ends, Idler, & Pitman arms need to be in good shape as well. Summit Racing offers the Moog product line & they're usually 50% less than your local parts place on the price.
Thanks for the helpful info! Luckily my truck only has 120K miles on it so I will give it all a good look. Alignment tips are super helpful! Will keep everyone updated on my results.
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 01-02-2020, 04:22 PM   #5
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

See the attached pictures for the update. Almost finished...ran into every problem you could imagine from having to break my wheel locks off to couldnt get the new shock in because the gasket was big...now i am fighting bearing race. Once i finish those, i will do the sway bar and rear.
Attached Images
     
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 01-02-2020, 04:22 PM   #6
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

Old shocks...
Attached Images
 
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 01-02-2020, 06:31 PM   #7
wixthedog
Junior Member
 
wixthedog's Avatar
 
Join Date: Sep 2019
Location: Magnolia, TX
Posts: 88
Re: Static Drop

It's coming along well! I always run into issue, its kind of expected at this point.

I assume you have the 1" brakes? The spindles look different.
__________________
Mike
1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop
Obligatory Build Thread HERE!
1979 C20 RCLB - 350 - TH350 Auto
wixthedog is offline   Reply With Quote
Old 01-09-2020, 03:37 PM   #8
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

Quote:
Originally Posted by wixthedog View Post
It's coming along well! I always run into issue, its kind of expected at this point.

I assume you have the 1" brakes? The spindles look different.
Thank you! And yes you are correct in the 1 inch spindles. I honestly bought the spindles on CL for a really good deal like 5 years ago and didnt check if they were the correct ones...but my luck paid off this time!
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 01-22-2020, 10:07 PM   #9
marcoman
Registered User
 
Join Date: Dec 2011
Location: Pico Rivera, CA
Posts: 8
Smile Re: Static Drop

So how'd it end up coming out? I'm looking to do a static drop in the future and I'd like to see your results.
marcoman is offline   Reply With Quote
Old 01-31-2020, 06:27 PM   #10
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

Front is done, minus the sway bar i need to install. Pretty happy with the front. Honestly, will probably end up cutting a coil off the springs i installed to try to lower the front one more inch.

Rear should be done in the next week or two. i will post updates.

The steering is way better with the truck lowered though. With that said, need and alignment lol
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 02-01-2020, 12:30 AM   #11
lolife99
Registered User
 
lolife99's Avatar
 
Join Date: Nov 2002
Location: Mid-MO
Posts: 22,641
Re: Static Drop

1/2 coil = 1” of drop.
That’s a rule I go by.
1 full coil will get you about 2” of drop.
__________________
Keith
Convert to disc brakes.
http://67-72chevytrucks.com/vboard/s...d.php?t=444823
WTB: Radio Delete Plates and clips.
lolife99 is offline   Reply With Quote
Old 02-11-2020, 12:15 AM   #12
MikeB
Registered User
 
MikeB's Avatar
 
Join Date: Jul 2000
Location: Plano, TX
Posts: 2,146
Re: Static Drop

How much net drop did you get on the front? I installed 2.5" spindles with new Moog coil springs (the softest they had), but ended up with a net drop of around 1.5". Turns out the new springs are the same extended height, but a little stiffer than the basic OE springs. Anyway, the truck has settled another 1/2" or so since then. I think my avatar picture is before the drop.
__________________
Mike
82 C10 Custom Deluxe SWB -- original paint, 355/TH350, Vortec heads, GM RamJet 350 roller cam.
69 C10 LWB -- Bought in 1989, now my son's. http://67-72chevytrucks.com/vboard/s...d.php?t=775449
Retired as a factory automation products salesman.
Worked part-time over the years for an engine builder and a classic car repair shop.
Member here for 20 years! This is the very first car/truck Internet forum I joined.
MikeB is offline   Reply With Quote
Old 02-18-2020, 03:27 PM   #13
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

Quote:
Originally Posted by MikeB View Post
How much net drop did you get on the front? I installed 2.5" spindles with new Moog coil springs (the softest they had), but ended up with a net drop of around 1.5". Turns out the new springs are the same extended height, but a little stiffer than the basic OE springs. Anyway, the truck has settled another 1/2" or so since then. I think my avatar picture is before the drop.
I ended with the same 1.5 net drop as you. That is why i want to eventually cut part of a coil off. Did you do hangers and shackles in the rear? Any advice?
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 02-18-2020, 03:27 PM   #14
1981_c10
Registered User
 
1981_c10's Avatar
 
Join Date: May 2015
Location: Fort Worth
Posts: 168
Re: Static Drop

Quote:
Originally Posted by lolife99 View Post
1/2 coil = 1” of drop.
That’s a rule I go by.
1 full coil will get you about 2” of drop.
That is good to know. Better to start small haha.
__________________
Builds:

1962 C10 Recreating Dad's High School Truck
1981 C10
1981_c10 is offline   Reply With Quote
Old 02-19-2020, 08:12 PM   #15
Scott91370
Registered User
 
Scott91370's Avatar
 
Join Date: Apr 2018
Location: Burleson, Tx
Posts: 11
Re: Static Drop

Wish I would have sen this sooner. I'm right up the road and have a small press for removing and replacing the bushings. I just did the rear springs and shackles this past weekend. Took about 20 minutes to r&r all 6.

Hoping to do the fronts this weekend.
__________________
Scott
1982 GMC Sierra
Scott91370 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:40 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com