Trailing Arm Crossmember Question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kens65fb · 07-25-2022, 06:48 PM

I bought a new trailing arm crossmember with openings for exhaust pipes.

My question is should I use the upper holes, or lower holes.

I installed the trailing arms in the lower hole, and it seems to have raised my truck, which I have gone through a lot of effort and expense to lower.

Anyone have an opinion on which set of holes to use.

The box is not installed on the frame yet, so now is the time to adjust.

vin63 · 07-25-2022, 07:28 PM

It kind of depends on what you plan on doing or how you intend to drive your truck. Using the upper holes moves the instant center forward and up for better traction in racing applications since our trucks tend to have a lot of chassis weight bias to the front.

kens65fb · 07-25-2022, 07:54 PM

Quote:

Originally Posted by vin63

It kind of depends on what you plan on doing or how you intend to drive your truck. Using the upper holes moves the instant center forward and up for better traction in racing applications since our trucks tend to have a lot of chassis weight bias to the front.

No racing for me, them days have long passed !!!

vin63 · 07-25-2022, 08:17 PM

Then I would just go by pinion and angle and ride height.

kens65fb · 07-25-2022, 08:20 PM

Quote:

Originally Posted by vin63

Then I would just go by pinion and angle and ride height.

Thanks

MikeN · 07-26-2022, 11:42 AM

Agree with Ken - will also say that the lowest hole will be closest to the stock location.

07-25-2022, 06:48 PM	#1
kens65fb Registered User Join Date: Dec 2018 Location: Dallas, PA Posts: 551	Trailing Arm Crossmember Question??? I bought a new trailing arm crossmember with openings for exhaust pipes. My question is should I use the upper holes, or lower holes. I installed the trailing arms in the lower hole, and it seems to have raised my truck, which I have gone through a lot of effort and expense to lower. Anyone have an opinion on which set of holes to use. The box is not installed on the frame yet, so now is the time to adjust. Attached Images Last edited by kens65fb; 07-25-2022 at 06:49 PM. Reason: ...

07-25-2022, 07:28 PM	#2
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: Trailing Arm Crossmember Question??? It kind of depends on what you plan on doing or how you intend to drive your truck. Using the upper holes moves the instant center forward and up for better traction in racing applications since our trucks tend to have a lot of chassis weight bias to the front. __________________ 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

07-25-2022, 08:17 PM	#4
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: Trailing Arm Crossmember Question??? Then I would just go by pinion and angle and ride height. __________________ 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

07-26-2022, 11:42 AM	#6
MikeN Registered User Join Date: Oct 2007 Location: Marietta, GA Posts: 810	Re: Trailing Arm Crossmember Question??? Agree with Ken - will also say that the lowest hole will be closest to the stock location.

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