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OBS 4/6 C Notch question

This is a discussion on OBS 4/6 C Notch question within the Street forums, part of the General Discussion category; Has anyone ever just welded in this piece from the bolt in c-notch? It seems like it would be a ...

  1. #1
    Registered User SS350Sport's Avatar
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    OBS 4/6 C Notch updated with pictures


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    Has anyone ever just welded in this piece from the bolt in c-notch?
    It seems like it would be a lot cleaner, just as strong if welded in and you wouldn't have to dick around with trimming the bed rail to clear the top of the bolt in notch. What do you guys think?
    Last edited by SS350Sport; 01-19-2009 at 10:20 AM. Reason: added pictures
    91 C1500 SPORT, 5.7, 700R4
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    DBG
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    Re: OBS 4/6 C Notch question

    The only problem I can see is that if you just use that small section of the notch to weld in, you don't have as much distribution of the load across that whole chunk of metal. If you welded that section in and boxed the area around it, you'd probably be fine.

    Darren
    Last edited by darren250r; 01-17-2009 at 11:45 AM.
    89 RCSB Dana 60/14 Bolt 4-lnk frnt/rr, 39.5's/14" Welds, 5.13, Truetrac/Detroit, AEM Intake, Holley 670 TBI, Holley Mnfld, Shorties, 40 series, no cat. 98 2wd 355, lt4 hotcam, 1.6 rllr rckrs



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    Registered User SS350Sport's Avatar
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    Re: OBS 4/6 C Notch question

    Boxing it is a good idea. All I would have to do is cut straight up the sides from the bottom ends of the notch and turn it around, I would have the plate for the box already welded to the notch portion.
    Last edited by SS350Sport; 01-17-2009 at 11:53 AM.
    91 C1500 SPORT, 5.7, 700R4
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    DBG
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    Re: OBS 4/6 C Notch question

    You would want to box the whole backside of the frame at least 6" or so to the left and right (looking at the picture) of the notch. The frame section you cut out isn't gonna be nearly enought material to give you the strength necessary. You're best bet would be to weld that notch in and then trace the shape of the frame onto a piece of 1/8" (min) thick sheet metal. Cut out the piece and weld it to the back side of your frame.

    Darren
    89 RCSB Dana 60/14 Bolt 4-lnk frnt/rr, 39.5's/14" Welds, 5.13, Truetrac/Detroit, AEM Intake, Holley 670 TBI, Holley Mnfld, Shorties, 40 series, no cat. 98 2wd 355, lt4 hotcam, 1.6 rllr rckrs



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    Registered User 5.7L JWL's Avatar
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    Re: OBS 4/6 C Notch question

    SS350Sport, sorry for the :jacked: but DARREN250R I just got done looking at your build up of your suspension WAY COOL MAN


    I just had to tell darren250r that
    Last edited by 5.7L JWL; 01-17-2009 at 04:52 PM.

    '98 ECSB, Edel Headers, Magnaflow Cats/CatBack
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    Registered User SS350Sport's Avatar
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    Re: OBS 4/6 C Notch question

    I hope you feel better now..
    91 C1500 SPORT, 5.7, 700R4
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    Registered User SS350Sport's Avatar
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    Re: OBS 4/6 C Notch Update with Pictures

    I had the C notch's ready to bolt in and started to think of a cleaner way to install them when I posted the question here. darren250r gave me the suggestion to box in the frame and here is what I came up with. I will post more when finished.

    Ready to bolt in.


    Here are the cuts I made, basically took off the top and bottom flanges




    Tacked in place


    Top view

    Side view
    91 C1500 SPORT, 5.7, 700R4
    :FSC:

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    Re: OBS 4/6 C Notch Update with Pictures

    Nice man. That's exactly what I was picturing when I was explaining it. That worked out well using the cut up notch instead of plate steel. I would go the same route if I was to put a c-notch in...much cleaner than a bolt-in. Probably stronger too.

    Darren

    Thanks JWL
    Last edited by darren250r; 01-18-2009 at 07:00 PM.
    89 RCSB Dana 60/14 Bolt 4-lnk frnt/rr, 39.5's/14" Welds, 5.13, Truetrac/Detroit, AEM Intake, Holley 670 TBI, Holley Mnfld, Shorties, 40 series, no cat. 98 2wd 355, lt4 hotcam, 1.6 rllr rckrs



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    Registered User 5.7L JWL's Avatar
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    Re: OBS 4/6 C Notch question

    Quote Originally Posted by SS350Sport
    I hope you feel better now..

    Not really.
    Just givin' credit.

    '98 ECSB, Edel Headers, Magnaflow Cats/CatBack
    K&N, Pully, Ign.Kit, D/S Rotors, SS Lines, BB 89 Tune
    Built 4L60E w/ Vigilante 2800 Stall
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    Registered User SS350Sport's Avatar
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    Re: OBS 4/6 C Notch Finished pictures

    I finished up the welding today. I think it will look a lot cleaner when painted and put back together. I also welded nuts on the inside of the frame rails and on top of the notch for my upper bag mount and the bump stops.

    Back view









    Nuts welded in:
    91 C1500 SPORT, 5.7, 700R4
    :FSC:

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    Re: OBS 4/6 C Notch question

    Nice clean workmanship. I like it. But, do those standard size frame rail notches actually provide enough clearance, to keep the rear-end from bottoming out, when doing a straight 6" axle flip?

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    Registered User SS350Sport's Avatar
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    Re: OBS 4/6 C Notch question

    Quote Originally Posted by LS1GMCTruck
    Nice clean workmanship. I like it. But, do those standard size frame rail notches actually provide enough clearance, to keep the rear-end from bottoming out, when doing a straight 6" axle flip?
    I can't say for sure, until I start driving it. But I would guess the answer will be yes. I do have some helper bags that will be installed and inflated for when I'm hauling a new project home.
    91 C1500 SPORT, 5.7, 700R4
    :FSC:

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    Registered User Tigwldr's Avatar
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    Re: OBS 4/6 C Notch question

    Great idea, that looks awesome.
    Nice work.

  14. #14
    DBG
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    Re: OBS 4/6 C Notch question

    Good Job

    Darren
    89 RCSB Dana 60/14 Bolt 4-lnk frnt/rr, 39.5's/14" Welds, 5.13, Truetrac/Detroit, AEM Intake, Holley 670 TBI, Holley Mnfld, Shorties, 40 series, no cat. 98 2wd 355, lt4 hotcam, 1.6 rllr rckrs



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    Re: OBS 4/6 C Notch question

    Nice work man! I had that notch on my obs ext. cab with a 4/6 and it would hit over bumps. That was my experience, I had to install a super c-notch. Good luck

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    Re: OBS 4/6 C Notch question

    Quote Originally Posted by PURPLEHAYES
    Nice work man! I had that notch on my obs ext. cab with a 4/6 and it would hit over bumps. That was my experience, I had to install a super c-notch. Good luck
    This is what I have been hearing as well. I don't want mine to EVER bottom out on my frame or snubbers. Are the Super-C sections just as easy to weld in? Thanks

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    Re: OBS 4/6 C Notch question

    Quote Originally Posted by LS1GMCTruck
    This is what I have been hearing as well. I don't want mine to EVER bottom out on my frame or snubbers. Are the Super-C sections just as easy to weld in? Thanks
    A little more work to weld in but basically same idea. You have to cut crossmember on bottom of bed for it to fit back on. When you put the bed back on it will lay on top of the notch. You will have to tighten bed bolts to pull the bed down tight. Or you could cut the bed, but what ever works for you. Have fun

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    Registered User ZRACE1's Avatar
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    Exclamation Re: OBS 4/6 C Notch question

    Hey SS350, is it my imagination or did you just flip over your U-bolt bracket when you flipped your rear end. I noticed you were using the stock brackets. Explain please how you did that....that is way cool.

    Thanks
    tony

  19. #19
    Ol' Skewl BS'er flotsamm's Avatar
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    Re: OBS 4/6 C Notch question

    Quote Originally Posted by ZRACE1
    Hey SS350, is it my imagination or did you just flip over your U-bolt bracket when you flipped your rear end. I noticed you were using the stock brackets. Explain please how you did that....that is way cool.

    Thanks
    tony

    Basically you cut the axle saddle off the axle then put it on the bottom. Then you flip the brackets over and use the u-bolts sideways across the leaf springs.
    5.7L, 5-Speed, 4/6 drop on 245/45/18's

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    Registered User SS350Sport's Avatar
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    Re: OBS 4/6 C Notch question

    Quote Originally Posted by ZRACE1
    Hey SS350, is it my imagination or did you just flip over your U-bolt bracket when you flipped your rear end. I noticed you were using the stock brackets. Explain please how you did that....that is way cool.

    Thanks
    tony

    What flotsamm said. I cut the spring perch off of the axle tube and rewelded it to the (new) bottom side of the tube. I'm going to drive it for the summer and tear it all back down for paint and do some more mods on the flip.
    91 C1500 SPORT, 5.7, 700R4
    :FSC:

 

 
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