Double Hump Crossmember Help ~ I confused. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Demon of Dreams · 03-04-2003, 09:33 PM

I was at a boneyard today and was looking for the double hump....

however... I don't know what the hell I'm looking for.

Basically I have a few different options.

One: Crossmember with no lateral bars.
Two: Crossmember with lateral bars.

Now... even the crossmembers that have the lateral bars are different... some have a lot of holes, some only have a few.

Some have 2 mounts and some have 1...

the one I had them set aside for me later measures 33.5 tip to tip at the laterals, and 33 even tip to tip on the main crossmember piece, and 5.5" from bottom of crossmember to the highest point of the lateral bar...

I've got a 350/TH350 2WD ...

what exactly am I looking for to do this??

AirMale · 03-04-2003, 10:10 PM

Welcome to my nightmare..... I went through 3-4 double humps until I found one that worked for me. The most important thing for me was that the transmission stayed the same height. There are a few crossembers that will raise it 1-2 inches higher and that's no good. I also wanted to use the braces on both sides to keep the frame stiff. One thing's for sure, you'll know how to get a crossmember in and out in record time by the time you find the right one.

Demon of Dreams · 03-04-2003, 10:15 PM

doh

well... at the moment, i don't know what to do...
I would like to have the laterals on there, but I'm not running a lot of power or anything...

there are single mount and double mount crossmembers... then there are 4wd and 2wd ...

I am so confused

*1FaastC10* · 03-04-2003, 11:00 PM

stick with a 2wd. what exactly are these "laterals" that you're talking about?

Demon of Dreams · 03-04-2003, 11:03 PM

I don't know which is which for the 2WD or not... thats my whole problem...

the laterals i'm talking about are the two support pieces that come off and arch upwards off the main crossmember to keep the frame from twisting n whatnot, added support

PHOENIX · 03-05-2003, 01:14 PM

I pulled thi crossmember off of a 2wd suburban in a junk yard. Tom currently has my crossmemeber, but he is supposed to be giving it back soon

Anyway heres a link with a few pictures of the crossmember:
http://67-72chevytrucks.com/vboard/s...ht=Crossmember

Demon of Dreams · 03-05-2003, 01:56 PM

looks good to me...
what about the two side bars? are they all that important? doesn't look like that one has any

PHOENIX · 03-05-2003, 03:39 PM

I dont know if I want to give this away or sell it now. Im planning a tranny swap, someday. I may need this. But if you contact the guy in the link he should be able to get you some of those extra braces. I dont remember the sub. having the braces, but I know what your talking about. I believe the crossmember was just bolted onto the frame without any additional bracing.

Demon of Dreams · 03-05-2003, 03:56 PM

the one with the braces at the yard they want $75 for :ugh: scary thought that is...

I'm not really worried about the braces if they're not that important...

but any idea if I have the double mount or single mount currently? I've yet to check and can't really do much about it at the moment...

AirMale · 03-05-2003, 05:23 PM

I disagree, the braces are there for a reason. If you ever decide to put a radical motor in your truck you will want the frame to be as stiff as poss. Just my opinion

Demon of Dreams · 03-05-2003, 05:25 PM

well... I just want to make sure i'm getting the right thing if I do indeed shell out $75 for the damn thing... lol ...

PHOENIX · 03-05-2003, 06:34 PM

Never said anything about not needing the braces, what I said was the vehicle which I pulled that crossmember off did not have the braces. I would also like to add, that it didnt look like it ever had them either. But if it were me, I would add them, atleast on one side.

Demon of Dreams · 03-05-2003, 06:50 PM

hehe well, some of the ones i saw don't have them, which is why i'm a bit confused...

**Captkaos** · 03-05-2003, 07:07 PM

I am sure you are addressing the braces when you say "laterals"
Like this:
http://www.captkaoscustoms.com/images/framecross3.jpg

I ran mine without them (PITA to put back in under the truck) for about 5 years with a 454 and 4 speed that I wasn't featherfoot with. It is there to make the chassis laterally stiffer, and I put them back in as you can tell in the pic. Typically you can look under a 73-75 and 1/2T with any engine config and it will have one.

Demon of Dreams · 03-05-2003, 07:09 PM

that looks about right...

dumb question though...

how the hell would I go about putting that in with a tranny and body in the way? :rofl: doesn't look all that easy

AirMale · 03-05-2003, 07:26 PM

Great pic! I used a lift and a tranny jack and had no problems. If your on your back in the driveway-->forget it!

Demon of Dreams · 03-05-2003, 08:01 PM

lmao... crap... well I could use a normal jack and jack stands but I really doubt it...

**Captkaos** · 03-06-2003, 12:27 AM

It isn't that hard to put back in if you don't have exhaust running in the way, but it is still a PITA.

Demon of Dreams · 03-06-2003, 02:18 AM

well, I was going to be pulling it off and putting the new one on before i put my exhaust on

man sometimes i wonder why in the hell I ever buy chevy's because they involve so much work to get what I want done...

Then I remind myself... its way easier than working on import trucks or a ford or dodge ... LMAO....

Would I be safe for awhile to not use the lateral support bars if I just want to get it done quick and easy and keep the lateral supports for later when I do need to replace some body parts? cause in all honesty one of these days in the future I'll have to replace the cab and fenders anyway

in your honest opinion guys, would I be safe? I'm running nothing more than a mild 350 and i don't drive all that hard too often...

**Captkaos** · 03-06-2003, 10:38 AM

Like I said, I ran mine for 5 years that way. I was street racing it if that makes you feel any better.

Demon of Dreams · 03-06-2003, 02:36 PM

i think i may have to go for it without them then... thanks guys

03-04-2003, 09:33 PM	#1
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	Double Hump Crossmember Help ~ I confused. I was at a boneyard today and was looking for the double hump.... however... I don't know what the hell I'm looking for. Basically I have a few different options. One: Crossmember with no lateral bars. Two: Crossmember with lateral bars. Now... even the crossmembers that have the lateral bars are different... some have a lot of holes, some only have a few. Some have 2 mounts and some have 1... the one I had them set aside for me later measures 33.5 tip to tip at the laterals, and 33 even tip to tip on the main crossmember piece, and 5.5" from bottom of crossmember to the highest point of the lateral bar... I've got a 350/TH350 2WD ... what exactly am I looking for to do this??

03-04-2003, 10:10 PM	#2
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Welcome to my nightmare..... I went through 3-4 double humps until I found one that worked for me. The most important thing for me was that the transmission stayed the same height. There are a few crossembers that will raise it 1-2 inches higher and that's no good. I also wanted to use the braces on both sides to keep the frame stiff. One thing's for sure, you'll know how to get a crossmember in and out in record time by the time you find the right one. __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

03-05-2003, 01:14 PM	#6
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	I pulled thi crossmember off of a 2wd suburban in a junk yard. Tom currently has my crossmemeber, but he is supposed to be giving it back soon Anyway heres a link with a few pictures of the crossmember: http://67-72chevytrucks.com/vboard/s...ht=Crossmember __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * Last edited by PHOENIX; 03-05-2003 at 01:17 PM.

03-05-2003, 03:39 PM	#8
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	I dont know if I want to give this away or sell it now. Im planning a tranny swap, someday. I may need this. But if you contact the guy in the link he should be able to get you some of those extra braces. I dont remember the sub. having the braces, but I know what your talking about. I believe the crossmember was just bolted onto the frame without any additional bracing. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

03-05-2003, 05:23 PM	#10
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	I disagree, the braces are there for a reason. If you ever decide to put a radical motor in your truck you will want the frame to be as stiff as poss. Just my opinion __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

03-04-2003, 10:15 PM	#3
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	doh well... at the moment, i don't know what to do... I would like to have the laterals on there, but I'm not running a lot of power or anything... there are single mount and double mount crossmembers... then there are 4wd and 2wd ... I am so confused

03-04-2003, 11:00 PM	#4
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	stick with a 2wd. what exactly are these "laterals" that you're talking about?

03-04-2003, 11:03 PM	#5
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	I don't know which is which for the 2WD or not... thats my whole problem... the laterals i'm talking about are the two support pieces that come off and arch upwards off the main crossmember to keep the frame from twisting n whatnot, added support

03-05-2003, 01:56 PM	#7
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	looks good to me... what about the two side bars? are they all that important? doesn't look like that one has any

03-05-2003, 03:56 PM	#9
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	the one with the braces at the yard they want $75 for :ugh: scary thought that is... I'm not really worried about the braces if they're not that important... but any idea if I have the double mount or single mount currently? I've yet to check and can't really do much about it at the moment...

03-05-2003, 05:25 PM	#11
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	well... I just want to make sure i'm getting the right thing if I do indeed shell out $75 for the damn thing... lol ...

03-05-2003, 06:34 PM	#12
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Never said anything about not needing the braces, what I said was the vehicle which I pulled that crossmember off did not have the braces. I would also like to add, that it didnt look like it ever had them either. But if it were me, I would add them, atleast on one side. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

03-05-2003, 06:50 PM	#13
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	hehe well, some of the ones i saw don't have them, which is why i'm a bit confused...

03-05-2003, 07:07 PM	#14
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	I am sure you are addressing the braces when you say "laterals" Like this: http://www.captkaoscustoms.com/images/framecross3.jpg I ran mine without them (PITA to put back in under the truck) for about 5 years with a 454 and 4 speed that I wasn't featherfoot with. It is there to make the chassis laterally stiffer, and I put them back in as you can tell in the pic. Typically you can look under a 73-75 and 1/2T with any engine config and it will have one. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

03-05-2003, 07:09 PM	#15
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	that looks about right... dumb question though... how the hell would I go about putting that in with a tranny and body in the way? :rofl: doesn't look all that easy



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03-05-2003, 07:26 PM	#16
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Great pic! I used a lift and a tranny jack and had no problems. If your on your back in the driveway-->forget it! __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

03-05-2003, 08:01 PM	#17
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	lmao... crap... well I could use a normal jack and jack stands but I really doubt it...

03-06-2003, 12:27 AM	#18
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	It isn't that hard to put back in if you don't have exhaust running in the way, but it is still a PITA. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

03-06-2003, 02:18 AM	#19
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	well, I was going to be pulling it off and putting the new one on before i put my exhaust on man sometimes i wonder why in the hell I ever buy chevy's because they involve so much work to get what I want done... Then I remind myself... its way easier than working on import trucks or a ford or dodge ... LMAO.... Would I be safe for awhile to not use the lateral support bars if I just want to get it done quick and easy and keep the lateral supports for later when I do need to replace some body parts? cause in all honesty one of these days in the future I'll have to replace the cab and fenders anyway in your honest opinion guys, would I be safe? I'm running nothing more than a mild 350 and i don't drive all that hard too often...

03-06-2003, 10:38 AM	#20
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Like I said, I ran mine for 5 years that way. I was street racing it if that makes you feel any better. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

03-06-2003, 02:36 PM	#21
Demon of Dreams WEEE!!! Join Date: Feb 2003 Location: Salem, OR Posts: 73	i think i may have to go for it without them then... thanks guys

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