which trucks have the double hump crossmember? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 05-07-2007, 11:59 PM

simple question

any idea on which trucks have the double hump tranny cross member? i'm thinking or redoing my exhaust with one to make it flow a little better

shadetree · 05-08-2007, 12:07 AM

I had a 72 with TH350, that used the double hoop trans crossmember.

ocbaud · 05-08-2007, 12:14 AM

Quote:

Originally Posted by shadetree

I had a 72 with TH350, that used the double hoop trans crossmember.

i'll rephrase

what year 73-87 trucks, came with the double crossmember?
unless older years fit(i dont think they do)

Ivan D. · 05-08-2007, 02:16 AM

You don't need no double hump, what you need are these:

and a pair of these:

and you're good. Oh, and some heat insulating stuff for the speedo cable, or yer ruck will smell like burnt rubber for quite some time (guess how I know). Pics of the setup tomorrow, too tired now after installing it for over four hours...

gchemist · 05-08-2007, 03:12 AM

3/4 tons and 1 tons have the dual hump crossmember. Look for trucks with a BB or 350 SB with a 400th tranny.

I have a custom made cross member. However, i'm not sure how well it will hold up to the new engine.

bigblock73 · 05-08-2007, 06:48 AM

Eric, the early to mid 70's trucks had them, regardless of engine/suspension setups. I want to say 73-76. My '73 1/2 ton 350 equipped truck has one.

bigblock73 · 05-08-2007, 06:50 AM

Quote:

Originally Posted by gchemist

I have a custom made cross member. However, i'm not sure how well it will hold up to the new engine.

Your crossmember will be fine no matter what engine you have installed.

Grande Rojo · 05-08-2007, 08:01 AM

I got one out of a 78' suburban 454/th400

Slonaker · 05-08-2007, 09:14 AM

Quote:

Originally Posted by gchemist

3/4 tons and 1 tons have the dual hump crossmember. Look for trucks with a BB or 350 SB with a 400th tranny.

When I was looking for one a couple of months ago, it looked like 3/4 and 1 tons had a taller frame. If you used all of the parts of a double hump crossmember, I don't think the brackets that mont to the upper part of the frame would reach. I don't know this for sure. It was just my observation.

I got my double hump crossmember off a late 70s BIG 10 or Heavy Half. I don't remember which one it was.

Slonaker

ocbaud · 05-08-2007, 10:16 AM

ya'll know what size bolts hold it on??? incase i want to go to the junk yard?

Pyrotechnic · 05-08-2007, 02:29 PM

I probably should have done that with mine but I didn't feel like hunting down a cross member.

The ultimate would be to fab up a tubular cross member if you or someone you knew could weld.

benoit454 · 05-08-2007, 05:32 PM

Can someone post a pic of the said double hump crossmember?

if it's what I'm thinking of the 86 4x4 1/2 ton we had, had the double one on it, with a 700r4 and 208 t-case.

SanitysBane · 05-08-2007, 09:16 PM

My '74 C20 has one.

**N2TRUX** · 05-09-2007, 12:41 AM

Quote:

Originally Posted by Pyrotechnic

....
The ultimate would be to fab up a tubular cross member if you or someone you knew could weld.

That was my solution...

ocbaud · 05-09-2007, 01:08 AM

alright, i need some plans on that so i can get it built myself.

come on i know you got some measurements on what i need to do!

gchemist · 05-09-2007, 01:37 AM

Here is my solution.

The crossmember was made by someone on this board. I can't remember who though. Speak up if it's you!!

BaddBusa2005 · 05-09-2007, 08:28 AM

my exhaust runs above my trans crossmember, I have had dual 3" and no have dual 2.5"

neverfinished · 05-09-2007, 09:35 AM

Quote:

Originally Posted by N2TRUX

That was my solution...

I see that you have the cross member bolted into the top of the frame as well as the bottom, is there an OE cross member that bolts in the same way? I ask because I have a set of bolts hanging in that same spot with nothing attached to them. My cross member sits inside the frame and is only bolted to the bottom of the frame.

Slonaker · 05-09-2007, 09:46 AM

http://www.speedwaymotors.com/p/4219...temNo=91628903

Something like that should work if you want to make your own, assuming it is wide enough.

Slonaker

Slonaker · 05-09-2007, 09:49 AM

Quote:

Originally Posted by neverfinished

I see that you have the cross member bolted into the top of the frame as well as the bottom, is there an OE cross member that bolts in the same way? I ask because I have a set of bolts hanging in that same spot with nothing attached to them. My cross member sits inside the frame and is only bolted to the bottom of the frame.

Most of them have legs that come off the bottom portion and bolt onto the top rail. It sounds like someone got lazy, and only bolted in the bottom portion of your crossmember after they worked on it. I saw several double hump crossmembers like that at the junkyard.

EDIT: This is Capt Kaos's doublehump crossmember (top of photo) with the extra legs in place:

http://www.captkaoscustoms.com/images/framecross3.jpg

Slonaker

neverfinished · 05-09-2007, 10:41 AM

Quote:

Originally Posted by Slonaker

Most of them have legs that come off the bottom portion and bolt onto the top rail. It sounds like someone got lazy, and only bolted in the bottom portion of your crossmember after they worked on it. I saw several double hump crossmembers like that at the junkyard.

EDIT: This is Capt Kaos's doublehump crossmember (top of photo) with the extra legs in place:

http://www.captkaoscustoms.com/images/framecross3.jpg

Slonaker

Great, one more thing for me to fix.

Pyrotechnic · 05-09-2007, 11:18 AM

Quote:

Originally Posted by Slonaker

Most of them have legs that come off the bottom portion and bolt onto the top rail. It sounds like someone got lazy, and only bolted in the bottom portion of your crossmember after they worked on it. I saw several double hump crossmembers like that at the junkyard.

EDIT: This is Capt Kaos's doublehump crossmember (top of photo) with the extra legs in place:

http://www.captkaoscustoms.com/images/framecross3.jpg

Slonaker

I guess that just goes with the saying "You'll always have a few bolts/nuts/screws/parts left over."

tvblazer78 · 05-09-2007, 01:23 PM

Here is what I got. I had to change it a bit to make it fit. but should work good.

http://www.*****************/S10CarrierBearing.php

Slonaker · 05-09-2007, 02:06 PM

Quote:

Originally Posted by neverfinished

Great, one more thing for me to fix.

In one of the doublehump crossmember threads, CaptKaos said he ran one without the extra braces behind a big block for several years without any problems. You will probably be fine without them.

Slonaker

MylilBowTie · 05-10-2007, 02:40 AM

The braces are a little over kill but to each his own. I can post a picture of mine tommorow.

Ivan D. Have any part numbers for those exhaust parts?

05-07-2007, 11:59 PM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	which trucks have the double hump crossmember? simple question any idea on which trucks have the double hump tranny cross member? i'm thinking or redoing my exhaust with one to make it flow a little better

05-08-2007, 12:07 AM	#2
shadetree Senior Member Join Date: Dec 1999 Location: Knightstown, in, usa Posts: 2,525	Re: which trucks have the double hump crossmember? I had a 72 with TH350, that used the double hoop trans crossmember. __________________ 1970 long fleet, 355 4 speed, primer, walnut goodies

05-08-2007, 02:16 AM	#4
Ivan D. glamoros piece o' lowlife Join Date: Mar 2007 Location: Redford, MI Posts: 1,164	Re: which trucks have the double hump crossmember? You don't need no double hump, what you need are these: and a pair of these: and you're good. Oh, and some heat insulating stuff for the speedo cable, or yer ruck will smell like burnt rubber for quite some time (guess how I know). Pics of the setup tomorrow, too tired now after installing it for over four hours... __________________ The more I drink, the more I drink, the more I drink... diesel, reg cab, long bed, 4 across the rear, single stack, wooden stakes, and lotsa lights - the Hay Express

05-08-2007, 03:12 AM	#5
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: which trucks have the double hump crossmember? 3/4 tons and 1 tons have the dual hump crossmember. Look for trucks with a BB or 350 SB with a 400th tranny. I have a custom made cross member. However, i'm not sure how well it will hold up to the new engine. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

05-08-2007, 06:48 AM	#6
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,826	Re: which trucks have the double hump crossmember? Eric, the early to mid 70's trucks had them, regardless of engine/suspension setups. I want to say 73-76. My '73 1/2 ton 350 equipped truck has one. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

05-08-2007, 08:01 AM	#8
Grande Rojo paper or plastic? Join Date: Nov 2002 Location: SW Missouri Posts: 671	Re: which trucks have the double hump crossmember? I got one out of a 78' suburban 454/th400 __________________ 1967 Chevy SWB 250 http://67-72chevytrucks.com/vboard/s...d.php?t=442157 1977 Chevy SWB 454 No More 454 getting 5.3 http://67-72chevytrucks.com/vboard/s...d.php?t=310518 1977 Stepside Truck of the month winner http://67-72chevytrucks.com/vboard/s...d.php?t=135524 1965 Chevy C10 454 http://67-72chevytrucks.com/vboard/s...d.php?t=731372 1975 Dodge Power Wagon http://67-72chevytrucks.com/vboard/s...=1#post7871388

05-08-2007, 10:16 AM	#10
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	Re: which trucks have the double hump crossmember? ya'll know what size bolts hold it on??? incase i want to go to the junk yard?

05-08-2007, 02:29 PM	#11
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: which trucks have the double hump crossmember? I probably should have done that with mine but I didn't feel like hunting down a cross member. The ultimate would be to fab up a tubular cross member if you or someone you knew could weld.

05-08-2007, 05:32 PM	#12
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: which trucks have the double hump crossmember? Can someone post a pic of the said double hump crossmember? if it's what I'm thinking of the 86 4x4 1/2 ton we had, had the double one on it, with a 700r4 and 208 t-case. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

05-08-2007, 09:16 PM	#13
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	Re: which trucks have the double hump crossmember? My '74 C20 has one. __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

05-09-2007, 01:08 AM	#15
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	Re: which trucks have the double hump crossmember? alright, i need some plans on that so i can get it built myself. come on i know you got some measurements on what i need to do!

05-09-2007, 01:37 AM	#16
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: which trucks have the double hump crossmember? Here is my solution. The crossmember was made by someone on this board. I can't remember who though. Speak up if it's you!! __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

05-09-2007, 08:28 AM	#17
BaddBusa2005 Registered User Join Date: Feb 2006 Location: Cleveland, TN Posts: 440	Re: which trucks have the double hump crossmember? my exhaust runs above my trans crossmember, I have had dual 3" and no have dual 2.5" __________________ 1981 Custom Deeluxe SWB 5.3/4L60e 3.73 and Auburn. Mustang Dyno 265hp/258tq

05-09-2007, 09:46 AM	#19
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: which trucks have the double hump crossmember? http://www.speedwaymotors.com/p/4219...temNo=91628903 Something like that should work if you want to make your own, assuming it is wide enough. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

05-09-2007, 01:23 PM	#23
tvblazer78 Low & Fast! Join Date: Jan 2007 Location: Knoxville, TN Posts: 3,110	Re: which trucks have the double hump crossmember? Here is what I got. I had to change it a bit to make it fit. but should work good. http://www.***************/S10CarrierBearing.php __________________ Southeastern Mini Truckin' Nationals April 27 and 28, 2012** Last edited by tvblazer78; 05-09-2007 at 01:25 PM.



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05-10-2007, 02:40 AM	#25
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: which trucks have the double hump crossmember? The braces are a little over kill but to each his own. I can post a picture of mine tommorow. Ivan D. Have any part numbers for those exhaust parts? __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

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