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07-26-2018, 06:42 PM | #1 |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,938
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Re: HOW TO: Crossmember sectioning ...
The X-member on my dually is notched 1.5" (89 Square body). The lower a-arms are PB 1" forward units but I originally had the modified OE lowers moved forward .750".
My set-up did require the small notch to the upper driver a-arm as mentioned. MMW uppers & later model OE uppers also had too large of an OD @ the bushing area & would not have cleared (I still have the MMW arms sitting in a box on the shelf three years later ). When I'm air'd out, I can slip a slim piece of cardboard between the shaft/notch (like a spiral notebook cover).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
07-27-2018, 02:06 PM | #2 | |
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Join Date: Dec 2009
Location: Kirkland, WA
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Re: HOW TO: Crossmember sectioning ...
Quote:
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1968 LWB C20 / AC / Wood Bed |
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07-27-2018, 02:46 PM | #3 |
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Join Date: Apr 2001
Location: DALLAS,TX
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Re: HOW TO: Crossmember sectioning ...
When I cupped the arms, I allowed for ~1/2" of clearance on my mock-up bag @ 25psi. Installed, the weight of the BBC plus those heavy hubs expanded the bad more than I liked (my clearance was about the thickness of a yardstick). I felt once the suspension started moving around, the bag would likely make contact.
I opted for Porterbuilt arms as they would swap right in place, had the forward placement option, & already had a tab for a sway bar (I still had to figure that out for the modified factory lowers as the original mounting position was no longer an option).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
08-07-2018, 10:57 PM | #4 |
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Join Date: Nov 2014
Location: IE California
Posts: 225
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Re: HOW TO: Crossmember sectioning ...
I too tried this and failed. Now i have to make my own motor mounts for my 292
nevertheless, it is an awesome write up |
04-07-2020, 12:31 PM | #5 |
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Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,871
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Re: HOW TO: Crossmember sectioning ...
Since the other pics went down here is one that I did from a long time ago.
Laying out the lines and welding the braces. Cut and cut and cut Rough idea Didn't get any of the pics of me welding it up or making the filler plates Hope it helps someone!
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
04-07-2020, 08:34 PM | #6 |
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Join Date: Feb 2019
Location: Upper Left USA
Posts: 83
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Re: HOW TO: Crossmember sectioning ...
Thank you for the pictures, very helpful.
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04-08-2020, 12:48 AM | #7 |
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Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,213
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Re: HOW TO: Crossmember sectioning ...
Nice work!
I did a video of mine, sectioned 2" because I went rack & pinion as well. Starts at about 4min:
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
04-08-2020, 09:49 AM | #8 |
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Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,938
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Re: HOW TO: Crossmember sectioning ...
Well done video/commentary.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
04-08-2020, 09:34 AM | #9 |
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Join Date: Sep 2003
Location: Rayne, LA
Posts: 2,782
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Re: HOW TO: Crossmember sectioning ...
I saved a pdf of a How-To off of Capt Kaos' website about 15 years ago, it should help anyone wanting to do this modification.
https://www.dropbox.com/s/v3kmtg5n71...ember.pdf?dl=1
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Steven "If dogs don't go to heaven, when I die I want to go wherever they went." -- Will Rogers R.I.P. Oscar R.I.P. Ratchet 1967 Pontiac GTO - Dad was the Original Owner 1970 Chevy 2wd SWB "Oscar's Truck" 1970 Chevy 2wd Blazer "Ratchet's Blazer" 2013 Chevy 2500HD Crew Cab Duramax/Allison Z71 LTZ "Brown Sugar" 2017 Chevy Suburban "BDB" 2020 Chevy Blazer Premier "Foxy" Member of Louisiana Classic Truck Club (LCTC) Shop Build |
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