Installing an MII... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mains52 · 02-13-2018, 08:36 AM

Hey guys I was just wondering if I need to wait until I have my control arms, spindles, and hubs in order to insure placement of my M II crossmember? Or can I just install it based of my axle center measurements and go from there?
Thanks for any knowledge in advance.

**mr48chev** · 02-13-2018, 02:48 PM

You should be able to do it based on the manufacture's measurements on the instruction sheet. Some guys do tweak the location a bit because they feel it might center the tire in the wheel well better but most of the manufactures have it pretty close to right to begin with.

**Dan in Pasadena** · 02-13-2018, 05:32 PM

^^^ As long as you’ll be ok with “pretty close”

whitedog76 · 02-13-2018, 09:58 PM

18 1/8 seems to be the magic number.

http://www.fulltiltstreetrods.com/47...%20Install.pdf

https://static.speedwaymotors.com/pd...7%20Heidts.pdf

Mains52 · 02-14-2018, 09:22 AM

Quote:

Originally Posted by whitedog76

18 1/8 seems to be the magic number.

http://www.fulltiltstreetrods.com/47...%20Install.pdf

https://static.speedwaymotors.com/pd...7%20Heidts.pdf

Thank You Ill be checking these links out.

Mains52 · 02-16-2018, 10:22 AM

Ok dudes who all has flattened the top of their frame for the spring hats ? the pdfs That whitedog sent both said to flatten the top of the frame.

agnes the dog · 02-16-2018, 04:05 PM

You didn't mention what year truck you're working on. The instruction sheet links are for 47-54.

**oldman3** · 02-16-2018, 04:11 PM

Main52, hope I don't come across as a "smart a$$", but I can't find anywhere in the PDF, where it says "flatten top of frame", for spring towers. I could be wrong if I am, I'm sorry.
I just want to help if I can.

Item #3 on both pdf's, do refer to boxing plates to frame, "grind frame rails edge flat so plates lay flat"

Item #6 on speedway pdf, refers to grinding the spring towers to fit the frame.

Both drawings show where the frame curves down in the front, the spring towers sides are straight and would need to match the frame.

I have a couple pics to show what they are talking about. First pic show boxing plate in place with the part of frame that needs to be removed. The second pic shows boxing plate in place with part cut out and top and both edges of frame ground flat to plate.

**oldman3** · 02-16-2018, 04:39 PM

Main52, here's a couple more pics showing the area on frame where spring towers would need to be trimed.

Pic 1 shows the curve in a stock frame

Pic 2 shows the same area with a straight edge (like the spring tower). You would have to put it in place and scribe the tower and trim to fit frame.

Pic 3 spring tower in place on frame.

Hope this helps, and if you need more info let me know...Jim

**oldman3** · 02-16-2018, 04:45 PM

I see in your build thread that you already have your boxing plates tacked in place, and received your crossmember. If I'm jumping to far ahead, you will need to remove the piece of old frame that goes up to the radiator crossmember, because that is where the rack and pinon opening in frame will go...Jim

Mains52 · 02-20-2018, 09:14 AM

Quote:

Originally Posted by oldman3

I see in your build thread that you already have your boxing plates tacked in place, and received your crossmember. If I'm jumping to far ahead, you will need to remove the piece of old frame that goes up to the radiator crossmember, because that is where the rack and pinon opening in frame will go...Jim

Thanks for the pics. I try to never take anything as a smart a$$ remark on here so no worries. Maybe I was reading it as the top of the frame but it was meaning the curve for the RAD crossmember the whole time. That makes sense. Had a pretty obnoxious head cold this weekend and was able to work out there so hopefully this week I can get out there. Thanks again OLDMAN3

**oldman3** · 02-20-2018, 09:42 AM

Quote:

Originally Posted by Mains52

Thanks for the pics. I try to never take anything as a smart a$$ remark on here so no worries. Maybe I was reading it as the top of the frame but it was meaning the curve for the RAD crossmember the whole time. That makes sense. Had a pretty obnoxious head cold this weekend and was able to work out there so hopefully this week I can get out there. Thanks again OLDMAN3

Your welcome, hope you feel better...Jim

dsraven · 02-20-2018, 11:09 AM

if you have the top brackets that use the T bolts to attach the upper control arm shafts then you will need to include some antidive angle to the top bracket. I think my TCI kit said 4 deg of slope on the top shaft, front to rear.

02-13-2018, 08:36 AM	#1
Mains52 Registered User Join Date: Jun 2016 Location: Knoxville, Illinois Posts: 335	Installing an MII... Hey guys I was just wondering if I need to wait until I have my control arms, spindles, and hubs in order to insure placement of my M II crossmember? Or can I just install it based of my axle center measurements and go from there? Thanks for any knowledge in advance.

02-13-2018, 02:48 PM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,711	Re: Installing an MII... You should be able to do it based on the manufacture's measurements on the instruction sheet. Some guys do tweak the location a bit because they feel it might center the tire in the wheel well better but most of the manufactures have it pretty close to right to begin with. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

02-13-2018, 09:58 PM	#4
whitedog76 Registered User Join Date: Jan 2014 Location: Peoria, IL Posts: 1,450	Re: Installing an MII... 18 1/8 seems to be the magic number. http://www.fulltiltstreetrods.com/47...%20Install.pdf https://static.speedwaymotors.com/pd...7%20Heidts.pdf

02-16-2018, 04:05 PM	#7
agnes the dog Registered User Join Date: Sep 2012 Location: Fishers, IN Posts: 272	Re: Installing an MII... You didn't mention what year truck you're working on. The instruction sheet links are for 47-54. __________________ Just because you can, doesn't necessarily mean you should. 1959 3100 stepside 355 + T5

02-16-2018, 04:11 PM	#8
oldman3 Senior Member Join Date: Mar 2011 Location: West Plains, Missouri Posts: 7,559	Re: Installing an MII... Main52, hope I don't come across as a "smart a$$", but I can't find anywhere in the PDF, where it says "flatten top of frame", for spring towers. I could be wrong if I am, I'm sorry. I just want to help if I can. Item #3 on both pdf's, do refer to boxing plates to frame, "grind frame rails edge flat so plates lay flat" Item #6 on speedway pdf, refers to grinding the spring towers to fit the frame. Both drawings show where the frame curves down in the front, the spring towers sides are straight and would need to match the frame. I have a couple pics to show what they are talking about. First pic show boxing plate in place with the part of frame that needs to be removed. The second pic shows boxing plate in place with part cut out and top and both edges of frame ground flat to plate. Attached Images __________________ my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=459839 Jimbo's long bed step build:http://67-72chevytrucks.com/vboard/s...t=464626<br /> Last edited by oldman3; 02-16-2018 at 04:41 PM.

02-13-2018, 05:32 PM	#3
Dan in Pasadena Senior Member Join Date: Nov 2008 Location: Glendora, CA Posts: 6,344	Re: Installing an MII... ^^^ As long as you’ll be ok with “pretty close” __________________ '55 Big Window Shortbed, Drive-It-&-Work-On-It slid down the "slippery slope" to a Frame-Off Rodstoration! LQ4/4l85e/C4 IFS/Mustang 8.8 rearend w/3.73's Dan's '55 Big Window "Build" - Well, Kinda!

02-16-2018, 10:22 AM	#6
Mains52 Registered User Join Date: Jun 2016 Location: Knoxville, Illinois Posts: 335	Re: Installing an MII... Ok dudes who all has flattened the top of their frame for the spring hats ? the pdfs That whitedog sent both said to flatten the top of the frame.

02-16-2018, 04:39 PM	#9
oldman3 Senior Member Join Date: Mar 2011 Location: West Plains, Missouri Posts: 7,559	Re: Installing an MII... Main52, here's a couple more pics showing the area on frame where spring towers would need to be trimed. Pic 1 shows the curve in a stock frame Pic 2 shows the same area with a straight edge (like the spring tower). You would have to put it in place and scribe the tower and trim to fit frame. Pic 3 spring tower in place on frame. Hope this helps, and if you need more info let me know...Jim Attached Images __________________ my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=459839 Jimbo's long bed step build:http://67-72chevytrucks.com/vboard/s...t=464626<br />

02-16-2018, 04:45 PM	#10
oldman3 Senior Member Join Date: Mar 2011 Location: West Plains, Missouri Posts: 7,559	Re: Installing an MII... I see in your build thread that you already have your boxing plates tacked in place, and received your crossmember. If I'm jumping to far ahead, you will need to remove the piece of old frame that goes up to the radiator crossmember, because that is where the rack and pinon opening in frame will go...Jim __________________ my build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=459839 Jimbo's long bed step build:http://67-72chevytrucks.com/vboard/s...t=464626<br /> Last edited by oldman3; 02-16-2018 at 08:33 PM.

02-20-2018, 11:09 AM	#13
dsraven Registered User Join Date: Nov 2010 Location: calgary alberta Posts: 8,334	Re: Installing an MII... if you have the top brackets that use the T bolts to attach the upper control arm shafts then you will need to include some antidive angle to the top bracket. I think my TCI kit said 4 deg of slope on the top shaft, front to rear.

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