Trailing Arm Crossmember Fit on a Blazer?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WarMonger · 09-17-2015, 02:59 PM

Ok, I have a 1972 Blazer that is 4WD. I'm converting to 2wd and putt'n her on the ground. I was wondering if I convert over to trailing arms, will the trailing arm Crossmember fit between the frame rails like in a C10 or will I have to do some serious mods?

mike16 · 09-17-2015, 05:44 PM

I'm not familiar with the Blazer market but arn't 4x4 blazers kinda valuable? Down here in AZ they are.

If you want to make it a two wheel drive theres a lever down on the floor betwen the passenger and the driver........

or just take the front drive shaft out

cdowns · 09-17-2015, 05:47 PM

yes the trailing arm crossmember will fit right in

Twisted78SS · 09-17-2015, 05:50 PM

Works out fine, did it to one of mine a few years ago with the help of Livrat,
http://67-72chevytrucks.com/vboard/s...d.php?t=327847
check pages 5-6.

While this was an aftermarket cross member, it is the same whether for a truck or blazer

WarMonger · 09-17-2015, 06:00 PM

Quote:

Originally Posted by Twisted78SS

Works out fine, did it to one of mine a few years ago with the help of Livrat,
http://67-72chevytrucks.com/vboard/s...d.php?t=327847
check pages 5-6.

While this was an aftermarket cross member, it is the same whether for a truck or blazer

Looks great. That link also helps out with my next question about the alignment of the crossmember. Did you use stock Trailing arms or aftermarket ones?

cdowns · 09-17-2015, 07:27 PM

2wd blazers used stock c10 type trailing arms for the suspension

elkniks · 09-17-2015, 09:01 PM

I just finished mine using stock but welded trailing arms and a CPP drop cross member with the trailing arm mounts upside down from stock. With no notch and a 3/8" bumpstop mounted to the frame the trailing arms come extremely close to hitting the frame a full compression. Installed ECC 6" rear springs and so far so good, I have only hit the bump stops twice and there is no contact between frame and trailing arms. Have fun drilling all them holes!

Also I followed Grincoloco's lead an moved the x-member that spans the front mounts for the rear leaf spring brackets but I had to fabricate brackets that tie that X-member to the lower half of the frame and plates with gussets for the coils to rest on.

elkniks · 09-17-2015, 09:55 PM

Also, go to Gringoloco's build and make sure to use the holes that he has pointed out to line up your x-member. Two of the existing holes will line up once you remove the parking cable brackets. If done correctly your rear wheels will be perfectly centered and your rear thrust angle will be good. When I took mine to the alignment shop the rear axle measured at 0.03, the tech told me that is better than a lot of new cars.

WarMonger · 09-18-2015, 10:03 AM

I checked out Gringoloco's build. Lots of good info on that thread

09-17-2015, 02:59 PM	#1
WarMonger Registered User Join Date: Jan 2015 Location: Ventura, CA Posts: 818	Trailing Arm Crossmember Fit on a Blazer?? Ok, I have a 1972 Blazer that is 4WD. I'm converting to 2wd and putt'n her on the ground. I was wondering if I convert over to trailing arms, will the trailing arm Crossmember fit between the frame rails like in a C10 or will I have to do some serious mods? __________________ ..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___\|__\____ -_--_-_ \|_(0)\|__\|_(0)] 1972 K5

09-17-2015, 05:44 PM	#2
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,529	Re: Trailing Arm Crossmember Fit on a Blazer?? I'm not familiar with the Blazer market but arn't 4x4 blazers kinda valuable? Down here in AZ they are. If you want to make it a two wheel drive theres a lever down on the floor betwen the passenger and the driver........ or just take the front drive shaft out

09-17-2015, 05:47 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Trailing Arm Crossmember Fit on a Blazer?? yes the trailing arm crossmember will fit right in __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-17-2015, 05:50 PM	#4
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	Re: Trailing Arm Crossmember Fit on a Blazer?? Works out fine, did it to one of mine a few years ago with the help of Livrat, http://67-72chevytrucks.com/vboard/s...d.php?t=327847 check pages 5-6. While this was an aftermarket cross member, it is the same whether for a truck or blazer __________________ Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired

09-17-2015, 07:27 PM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Trailing Arm Crossmember Fit on a Blazer?? 2wd blazers used stock c10 type trailing arms for the suspension __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

09-17-2015, 09:01 PM	#7
elkniks Registered User Join Date: Mar 2015 Location: Seaside,CA Posts: 142	Re: Trailing Arm Crossmember Fit on a Blazer?? I just finished mine using stock but welded trailing arms and a CPP drop cross member with the trailing arm mounts upside down from stock. With no notch and a 3/8" bumpstop mounted to the frame the trailing arms come extremely close to hitting the frame a full compression. Installed ECC 6" rear springs and so far so good, I have only hit the bump stops twice and there is no contact between frame and trailing arms. Have fun drilling all them holes! Also I followed Grincoloco's lead an moved the x-member that spans the front mounts for the rear leaf spring brackets but I had to fabricate brackets that tie that X-member to the lower half of the frame and plates with gussets for the coils to rest on. Last edited by elkniks; 09-17-2015 at 09:07 PM.

09-17-2015, 09:55 PM	#8
elkniks Registered User Join Date: Mar 2015 Location: Seaside,CA Posts: 142	Re: Trailing Arm Crossmember Fit on a Blazer?? Also, go to Gringoloco's build and make sure to use the holes that he has pointed out to line up your x-member. Two of the existing holes will line up once you remove the parking cable brackets. If done correctly your rear wheels will be perfectly centered and your rear thrust angle will be good. When I took mine to the alignment shop the rear axle measured at 0.03, the tech told me that is better than a lot of new cars.

09-18-2015, 10:03 AM	#9
WarMonger Registered User Join Date: Jan 2015 Location: Ventura, CA Posts: 818	Re: Trailing Arm Crossmember Fit on a Blazer?? I checked out Gringoloco's build. Lots of good info on that thread __________________ ..................... ____ .........________//__{\_____ ,,,,,,,/__(O)___//___/__(O)_/ 1970 C20 -_--_--_- ______ _--_--_- /___\|__\____ -_--_-_ \|_(0)\|__\|_(0)] 1972 K5



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