Is this the correct crossmember? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BigRed76 · 05-15-2012, 10:06 PM

It appears to me that the current transmission crossmember on my '71 isn't the right one. The reason I think this is because the rear of the transmission seems really low, especially when you compare the angles of the transmission output and the driveshaft. So hopefully someone can confirm if this is indeed a correct auto trans. crossmember for a '67-'72.

I for sure know it's not the original crossmember since the truck used to be a three-on-the-tree truck. It also looks like the wrong transmission mount because I've never seen a round hockey puck style mount on these trucks.

Tx Firefighter · 05-16-2012, 09:26 AM

No, that's the wrong crossmember.

The correct one is flat along the bottom and mounts inside the frame webs, not below it. They also have a wing on each side that goes up and mounts to the top of the frame rail too.

Image stolen from google...

BigRed76 · 05-16-2012, 09:31 AM

Thanks for that picture. I had searched google but could only find top views of the crossmembers, which didnt help me. Do you have any opinion on aftermarket crossmembers vs. factory crossmembers?

Tx Firefighter · 05-16-2012, 09:34 AM

I like factory ones myself. I have always felt that GM engineers know a lot more than most aftermarket engineers do. I like the way they tie the upper and lower frame sections together at an angle. It stiffens the frame a lot.

68gmsee · 05-16-2012, 09:53 AM

Should be able to find one in a salvage yard just remember that they originally were riveted in and you have to cut the rivets or blow torch them off.

As low as that crossmember is, can you remount it on the upper part of the frame or maybe bolt it to the top section?

jjzepplin · 05-16-2012, 09:57 AM

Or put in longer bolts and some spacers to lift it up some?

Tx Firefighter · 05-16-2012, 10:07 AM

Quote:

Originally Posted by 68gmsee

Should be able to find one in a salvage yard just remember that they originally were riveted in and you have to cut the rivets or blow torch them off.

As low as that crossmember is, can you remount it on the upper part of the frame or maybe bolt it to the top section?

Auto crossmember were bolted in. Only standards were riveted in.
Posted via Mobile Device

**FirstOwner69** · 05-16-2012, 12:25 PM

Chevy072 has a couple for sale on the parts board.
http://67-72chevytrucks.com/vboard/s...d.php?t=521538

**derotoreut** · 07-17-2012, 09:44 PM

Subscribed. I think I have the same problem.

05-15-2012, 10:06 PM	#1
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Is this the correct crossmember? It appears to me that the current transmission crossmember on my '71 isn't the right one. The reason I think this is because the rear of the transmission seems really low, especially when you compare the angles of the transmission output and the driveshaft. So hopefully someone can confirm if this is indeed a correct auto trans. crossmember for a '67-'72. I for sure know it's not the original crossmember since the truck used to be a three-on-the-tree truck. It also looks like the wrong transmission mount because I've never seen a round hockey puck style mount on these trucks. Attached Images __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

05-16-2012, 09:26 AM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Is this the correct crossmember? No, that's the wrong crossmember. The correct one is flat along the bottom and mounts inside the frame webs, not below it. They also have a wing on each side that goes up and mounts to the top of the frame rail too. Image stolen from google... __________________ I'm on the Instagram- @Gearhead_Kevin

05-16-2012, 09:31 AM	#3
BigRed76 Registered User Join Date: Jan 2010 Location: Loveland, CO Posts: 1,921	Re: Is this the correct crossmember? Thanks for that picture. I had searched google but could only find top views of the crossmembers, which didnt help me. Do you have any opinion on aftermarket crossmembers vs. factory crossmembers? __________________ Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB

05-16-2012, 09:34 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Is this the correct crossmember? I like factory ones myself. I have always felt that GM engineers know a lot more than most aftermarket engineers do. I like the way they tie the upper and lower frame sections together at an angle. It stiffens the frame a lot. __________________ I'm on the Instagram- @Gearhead_Kevin

05-16-2012, 09:53 AM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Is this the correct crossmember? Should be able to find one in a salvage yard just remember that they originally were riveted in and you have to cut the rivets or blow torch them off. As low as that crossmember is, can you remount it on the upper part of the frame or maybe bolt it to the top section?

05-16-2012, 09:57 AM	#6
jjzepplin Registered User Join Date: Feb 2012 Location: Ruskin Florida Posts: 4,566	Re: Is this the correct crossmember? Or put in longer bolts and some spacers to lift it up some? __________________ 70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350

05-16-2012, 12:25 PM	#8
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,847	Re: Is this the correct crossmember? Chevy072 has a couple for sale on the parts board. http://67-72chevytrucks.com/vboard/s...d.php?t=521538

07-17-2012, 09:44 PM	#9
derotoreut Roto Reuter thats the name... Join Date: Feb 2010 Location: Darien, NY Posts: 1,853	Re: Is this the correct crossmember? Subscribed. I think I have the same problem. __________________ ~ Dan My 70 K10 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=782232 My 71 SWB build:http://67-72chevytrucks.com/vboard/s...d.php?t=651394 1970 SWB Fleet K10 4X4, 5.3L LM7, 4L60E, Dakota Digital RTX, Vintage Air, Ididit tilt 1971 SWB Fleet C10 - Original SWB Arizona truck, new custom restoration project "Kick out your motor and drive while you're still alive - kick it out!" - Heart 1977

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.