How To: Build your own Low Profile Transmission Cross Member - Chevrolet Colorado & GMC Canyon Forum
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Old 05-12-2009, 10:49 AM   3 links from elsewhere to this Post. Click to view. #1
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How To: Build your own Low Profile Transmission Cross Member

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A 355nation How To presented by
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Project Description
Building your own low profile crossmember

Skill Level
Advanced

Project Vehicle
Make: Chevrolet
Model: Colorado
Year: 2006
Engine: 3.5L
Transmission: Auto
Power windows: No
Sun Roof: No

Required Parts
  • (1) 1”x 2”x 8’ steel rectangular tubing
  • (1) ¼”x 4”x 2’ steel plate
  • Black rust preventive paint

Required Tools
  • Drill
  • Drill bits
  • Angle grinder
  • Sawzall
  • Ratchet
  • Metric sockets
  • Metric wrenches
  • Welder

Project Cost
$50

Installation Instructions
  1. The stock cross member is 43" wide, so what I’m going to do is cut this 8' piece of box in half and weld it side-by-side together to give me a 1" x 4" box - 48" long. Then I’ll just notch the ends and create a mount for the transmission mount. Welding the pieces side-by-side will make the box super-strong, but I’m also going to sandwich a piece of 1/4" plates at the ends for additional strength.


  2. So this morning I took a bunch of measurements.

    Diagram by: Sweet Victory

    Then I got busy with the sawzall & angle grinder and cut out the pieces.





  3. This will all be welded together just how I have it clamped out on my bench. You'll notice that I have a piece of 1/4" plate sandwiched at the ends for extra strength.


  4. I removed the stock member, measured the bolt holes onto the new one, and drilled them out. Then I measured for the transmission mount. I plan to get those pieces cut out this weekend. I also clamped the stock cross member & the new cross member to my sawhorses so you can see the difference in ground clearance. Overall there is a 2.25" difference at the lowest points comparing them.


  5. I got the pieces all cut out to make the perch for the transmission mount.




  6. Once I get it welded then I just have to drill the slots in the plate for the transmission mount and she'll be ready to go on.


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Old 05-12-2009, 11:04 AM   #2
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re: How To: Build your own Low Profile Transmission Cross Member

nice! how thick is the wall on the square tubing?
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Old 05-12-2009, 11:10 AM   #3
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re: How To: Build your own Low Profile Transmission Cross Member

i suggest using button head cap screws instead of the bolts you have. less to hang up on. and it is the same bolt jtr send with theres.
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Old 05-12-2009, 11:35 AM   #4
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re: How To: Build your own Low Profile Transmission Cross Member

Quote:
Originally Posted by ColoradoTom View Post
nice! how thick is the wall on the square tubing?
1/8"

Quote:
Originally Posted by The Wolf! View Post
i suggest using button head cap screws instead of the bolts you have. less to hang up on. and it is the same bolt jtr send with theres.
No way. Ive never had a problem with regular bolts ever rubbing on anything. Its still higher than the leaf pockets, or the lower control arms. If my K-member ever rubs then I know I cant make it and just back up / try again.

The problem with using cap screws is that these bolts will inevitably get rusted into place (unless you use stainless, but then they are really soft and can easily snap off). If you use cap screw's I can guarantee that if they get even a lil but rusted in that you will strip the allen key socket and end up having to drill / tap it out since you cant get vise grips on a cap screw. At least with a bolt head you wont strip it with a socket. Worst case you bust the head off the bolt and have to drill / tap it out - but at least you wont have to drill the head off and risk ruining your cross member.
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Last edited by burn; 08-01-2009 at 01:37 PM.
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Old 05-12-2009, 02:48 PM   #5
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re: How To: Build your own Low Profile Transmission Cross Member

Looks real sharp man, what was the final build cost?
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Old 05-12-2009, 04:09 PM   #6
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re: How To: Build your own Low Profile Transmission Cross Member

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Originally Posted by LoadedDiablo View Post
Looks real sharp man, what was the final build cost?
like $20 including paint.
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Old 05-12-2009, 09:54 PM   #7
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re: How To: Build your own Low Profile Transmission Cross Member

nicely done mayne

and awesome vag-tastic pic!!!
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Old 05-12-2009, 10:03 PM   #8
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re: How To: Build your own Low Profile Transmission Cross Member

Jenny McCarthy back in her glory days.
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Old 05-15-2009, 04:18 AM   #9
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re: How To: Build your own Low Profile Transmission Cross Member

lol i was just looking into doing this, any chance you have the measurements for the center piece where the transmission bolts to,
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Old 05-15-2009, 10:08 AM   #10
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re: How To: Build your own Low Profile Transmission Cross Member

hrmn, no sorry. I just took all the measurements off the stock one and transfered them to the new one.
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Old 05-15-2009, 04:21 PM   #11
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re: How To: Build your own Low Profile Transmission Cross Member

alright was it hard cuase it looks like it is on an angle
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Old 05-15-2009, 06:57 PM   #12
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re: How To: Build your own Low Profile Transmission Cross Member

Quote:
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alright was it hard cuase it looks like it is on an angle
Because the frame rails are gradually coming together towards the front of the truck - the edges had to be a bit tapered. You can see this in this pic:



I just pull the stocker our and measure. Dont recall what it was tho.
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Old 05-24-2009, 08:46 PM   #13
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re: How To: Build your own Low Profile Transmission Cross Member

chevy should modify the cross member regardless of ride height.
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Old 08-12-2009, 02:06 PM   #14
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re: How To: Build your own Low Profile Transmission Cross Member

where can you pick up a piece of box tube like that? lowes or home depot have it you think?
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Old 08-12-2009, 02:26 PM   #15
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re: How To: Build your own Low Profile Transmission Cross Member

Quote:
Originally Posted by spikeddrummer View Post
where can you pick up a piece of box tube like that? lowes or home depot have it you think?
They might have it, some are better stocked then others.
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Old 08-12-2009, 05:34 PM   #16
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re: How To: Build your own Low Profile Transmission Cross Member

I got it from Princess Auto - its sort of a tractor supply shop. I believe its a Canada only shop tho: Princess Auto | Quality Selection Service & Value



Paid I think $18 for the 8' length.
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Old 08-27-2009, 06:07 PM   #17
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Re: How-To: Build your own low profile cross member

now make one for the gas tank crossmemeber.. same setup tho... just with the carrier bearing on it!
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Old 09-20-2009, 09:51 PM   #18
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Re: How-To: Build your own low profile cross member

how much would you want to build one for me? if its less than the JTR one i might be interested.
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Old 09-21-2009, 09:04 AM   #19
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Re: How-To: Build your own low profile cross member

Its not worth my time to build one and still be competitive cost wise with the companies already building them.
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Old 11-05-2009, 11:07 AM   #20
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re: How To: Build your own Low Profile Transmission Cross Member

when you remove the xmember are you able to raise the tranny upwards about an inch? Or does it have to stay in the same location.


I want to push my tranny up more into the frame. Is it possible?
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