CPP round tube trailing arms with bags question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rex01atv · 11-30-2008, 12:52 PM

Does anybody have the cpp round tube trailing arms? If so how low will they allow you to go? I have bought a pair and installed with bags, and only have c notch. I plan on doing bridge notch to get low as possible. Will this setup allow me to lay frame?

**lolife99** · 11-30-2008, 01:25 PM

First off,... NICE truck.
As far as I know,... these are basically replacement arms with a little more "style". I don't think they will get you any lower than the stock arms. The problem area is where the trailing arm crosses under the stock frame.

72BlckButy · 11-30-2008, 01:35 PM

Check out the extreme drop cross member offered by ECE or CPP. ECE has great parts and even better customer service.

rex01atv · 11-30-2008, 02:46 PM

thanks, I appreciate the reply!

**scotts62** · 11-30-2008, 03:02 PM

awesome truck man!

Painter D · 11-30-2008, 04:46 PM

Quote:

Originally Posted by lolife99

First off,... NICE truck.
As far as I know,... these are basically replacement arms with a little more "style". I don't think they will get you any lower than the stock arms. The problem area is where the trailing arm crosses under the stock frame.

He's right.

SCOTI · 11-30-2008, 11:32 PM

Bags located between the stock frame & trailing arm will be the limiting factor on how low it goes. The center crossmember will help w/the peeve of hanging-up on stuff (especially when loading on to a trailer).

I've measured a truck from another board member (Filmguy) that used CPP's arms. With the bag air'd out & w/a KP step notch kit, the frame is 5" off the ground @ the rear cab mount C/L. It's still pretty low.... just not laying frame if that's a goal.

vin63 · 12-03-2008, 01:20 PM

As the others mentioned, the limiting factor is the trailing arm itself - springs mount between the arm and the frame, and the arm angles out from the crossmember, passed the frame to the rear axle housing. I run the tubular trailing arms from CPP and air springs, but I only wanted to go as low as the C-notch and trailing arms would allow (I use my truck to haul parts, etc.). If you want to go lower, you'll need to go with a suspension that is located inside the frame rails, such as a four-link.

72hotrodder · 12-03-2008, 04:09 PM

or just put in about a 3-4in lowering block. done it on two and it works great and lays the bad on the ground.

Mrwlliam · 12-03-2008, 05:05 PM

someone have pics of the lowering block at work?

vin63 · 12-09-2008, 03:00 PM

Quote:

Originally Posted by Mrwlliam

someone have pics of the lowering block at work?

Just in case you haven't received a photo, here's one of mine with the CPP trailing arms and lowering block. I'm using the lowering block to give me a little more air spring travel (so it's no so compressed at full drop).

*Shane* · 12-09-2008, 03:23 PM

a 3" - 4" block is fine on a mini truck, but a block larger than 2" is NOT recommended on these model trucks (trailing arm) due to scrub line issues. you will have things dragging the ground when they aren't meant to.

SCOTI · 12-09-2008, 03:51 PM

Quote:

Originally Posted by Shane

a 3" - 4" block is fine on a mini truck, but a block larger than 2" is NOT recommended on these model trucks (trailing arm) due to scrub line issues. you will have things dragging the ground when they aren't meant to.

Scrub line issues will be more of a concern w/lower diameter wheels (1.5" blocks are about max for 15" wheels). That being said, geometry says putting a big gap (3 or 4") between the trailing arm & an axle that generates the twisting forces it can produce is not ideal. Picture trying to hold a moderately sized squirming animal steady 2 different ways: 1st, up against your chest wrapped in your arms; 2nd, w/your arms extended out. Which will offer the better control?

I've read before that 2" should be about the max on lowering blocks regardless of whether it's a leaf or truck arm configuration.....

vin63 · 12-09-2008, 04:11 PM

When you're referring to "scrub line" I'm assuming you are referring to anything hanging below the horizontal line at the bottom of the wheels and not the tracking line of the suspension relative to the ball joint centerline.

My blocks are just shy of 2-inches tall and the lowest part of the rear suspension is the bottom of the U-bolt (front threaded stud), which is about a 1/2-inch above the bottom of my wheel.

*Shane* · 12-09-2008, 05:06 PM

That is correct vin63. I have always described the scrub line in a simple layman's terms as as anything that will touch the ground in the event of a flat tire.

11-30-2008, 12:52 PM	#1
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	CPP round tube trailing arms with bags question Does anybody have the cpp round tube trailing arms? If so how low will they allow you to go? I have bought a pair and installed with bags, and only have c notch. I plan on doing bridge notch to get low as possible. Will this setup allow me to lay frame? Attached Images

11-30-2008, 01:25 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,700	Re: CPP round tube trailing arms with bags question First off,... NICE truck. As far as I know,... these are basically replacement arms with a little more "style". I don't think they will get you any lower than the stock arms. The problem area is where the trailing arm crosses under the stock frame. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

11-30-2008, 01:35 PM	#3
72BlckButy Tot Roddin' Join Date: Apr 2005 Location: Mid-MO Posts: 24,461	Re: CPP round tube trailing arms with bags question Check out the extreme drop cross member offered by ECE or CPP. ECE has great parts and even better customer service. __________________ -Nate 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package)

11-30-2008, 02:46 PM	#4
rex01atv Registered User Join Date: Apr 2007 Location: OR Posts: 198	Re: CPP round tube trailing arms with bags question thanks, I appreciate the reply!

11-30-2008, 03:02 PM	#5
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,243	Re: CPP round tube trailing arms with bags question awesome truck man! __________________ Scott 93 crew cab build Project 62

11-30-2008, 11:32 PM	#7
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	Re: CPP round tube trailing arms with bags question Bags located between the stock frame & trailing arm will be the limiting factor on how low it goes. The center crossmember will help w/the peeve of hanging-up on stuff (especially when loading on to a trailer). I've measured a truck from another board member (Filmguy) that used CPP's arms. With the bag air'd out & w/a KP step notch kit, the frame is 5" off the ground @ the rear cab mount C/L. It's still pretty low.... just not laying frame if that's a goal. __________________ 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.*

12-03-2008, 01:20 PM	#8
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: CPP round tube trailing arms with bags question As the others mentioned, the limiting factor is the trailing arm itself - springs mount between the arm and the frame, and the arm angles out from the crossmember, passed the frame to the rear axle housing. I run the tubular trailing arms from CPP and air springs, but I only wanted to go as low as the C-notch and trailing arms would allow (I use my truck to haul parts, etc.). If you want to go lower, you'll need to go with a suspension that is located inside the frame rails, such as a four-link. __________________ 1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes

12-03-2008, 04:09 PM	#9
72hotrodder THE TOY STORE Join Date: Nov 2008 Location: florence al Posts: 227	Re: CPP round tube trailing arms with bags question or just put in about a 3-4in lowering block. done it on two and it works great and lays the bad on the ground.

12-03-2008, 05:05 PM	#10
Mrwlliam Registered User Join Date: Nov 2008 Location: Waco, Tx Posts: 70	Re: CPP round tube trailing arms with bags question someone have pics of the lowering block at work?

12-09-2008, 03:23 PM	#12
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: CPP round tube trailing arms with bags question a 3" - 4" block is fine on a mini truck, but a block larger than 2" is NOT recommended on these model trucks (trailing arm) due to scrub line issues. you will have things dragging the ground when they aren't meant to.

12-09-2008, 04:11 PM	#14
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: CPP round tube trailing arms with bags question When you're referring to "scrub line" I'm assuming you are referring to anything hanging below the horizontal line at the bottom of the wheels and not the tracking line of the suspension relative to the ball joint centerline. My blocks are just shy of 2-inches tall and the lowest part of the rear suspension is the bottom of the U-bolt (front threaded stud), which is about a 1/2-inch above the bottom of my wheel. __________________ 1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes

12-09-2008, 05:06 PM	#15
Shane Account Suspended Join Date: Jun 2000 Location: over yonder Posts: 14,270	Re: CPP round tube trailing arms with bags question That is correct vin63. I have always described the scrub line in a simple layman's terms as as anything that will touch the ground in the event of a flat tire.



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