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Old 10-19-2018, 01:52 PM   #1
66C10LB
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Outside bottom rear cab flange replacement

Does anyone have experience in replacing the outside bottom rear cab flange (just the bottom flange area, but all the way across the back of the cab)? Is this best created with a bead roller? Should it be with a male bead of perhaps 1/4 inch diameter plus a polymer wheel to "tip" it in the positive and the negative directions that are needed for the shape of the flange? Is there typically some shrinking and stretching to do after this is created in the contours that are needed? Any other suggestions on tools and how to achieve this? See image.
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Old 10-19-2018, 08:18 PM   #2
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Re: Outside bottom rear cab flange replacement

... part of the reason I want to replace this is that the rear flange on the Counterpart cab corner is not very consistant/accurate compared to the original. Because of this, I might as well replace the entire width at the rear outer bottom flange of the cab. Thoughts?
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Old 10-20-2018, 01:49 PM   #3
Clyde65
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Re: Outside bottom rear cab flange replacement

I don’t know how to help you, I honestly don’t see any rust through and only see some surface rust. Might be just the way my computer shows the picture too.

That is all a pinched and welded seam, maybe it’s been folded over some how as well.

I would say, if there is rust through, use some 16ga flat and recreate it, stitch welding to original.
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Old 10-20-2018, 06:43 PM   #4
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Re: Outside bottom rear cab flange replacement

Thanks Clyde. There actually is some rust through in some areas in the curved areas. When wire wheeling, it broke through in some areas. Also, the Counterpart cab corner in that area is far from ideal - inconsistent flange and not a straight line but instead it is an arc. For these reasons, I was hoping to recreate the entire area. Perhaps I should purchase a low cost bead roller and try to bend these shapes. You are right that I have the option to just replace some areas instead of the whole thing. I may be able manage with just a bending brake and shaping with a hammer for the curves. I will post some better pictures later...
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Old 10-21-2018, 08:18 AM   #5
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Re: Outside bottom rear cab flange replacement

Mine was ok at the trans tunnel and the flat lines off of them but i made my own "flanges" in sections by just hammering them over a 1/4 rod and welding a flat thin piece to that radius. it came out great and looked good. I just didnt replicate the spot welds. Having a roller would have been much easier.
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Old 10-21-2018, 10:43 PM   #6
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Re: Outside bottom rear cab flange replacement

Thanks rideblue00 for the comment. It helped me to realize that I should be able to create this just using a small metal brake. (I did a small test piece...the bends look very close to the original) For the 30 degree radiused curves, I will simply angle each straight piece by 15 degrees (creating a sharp angle), then fill in with some pieces of curved metal to create the radiused curves. Like yours, this should look good when complete. Thanks again.
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Old 10-22-2018, 06:42 AM   #7
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Re: Outside bottom rear cab flange replacement

I would make patches for the bad areas and just do those. That joint is the floor and the back of the cab and would be a huge undertaking to fab the replacement parts for the entire run across. As far as the cab corner goes I would metal work it to better fir the rest of the truck.
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Old 10-22-2018, 12:29 PM   #8
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Re: Outside bottom rear cab flange replacement

Good point PGSigns. This decision, which plug welds to break apart and which to leave alone, comes up throughout these trucks, such as around the door openings etc. The perfectionist in me wants to do them all, while the practical part of me says many should be left alone and simply cleaned up. Your point is a good one because many of these trucks, being vintage, will not see constant use so just a good cleaning up of many of these joints is suitable.
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Old 10-24-2018, 01:22 AM   #9
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Re: Outside bottom rear cab flange replacement

I made 2 separate orders and ended up with a Counterpart and a TriPlus cab corner, the Counterpart one went in the bin and the TriPlus fit like a glove. I ordered up another TriPlus for the other side. IIRC they aren’t too costly.
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Old 10-29-2018, 05:15 AM   #10
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Re: Outside bottom rear cab flange replacement

For the angled curved sections next to the tunnel, I'd probably hammer form patch panels, on a buck form.

I would also vote for making patch panels, rather than replacing the entire lower section.
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Old 11-02-2018, 01:57 PM   #11
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Re: Outside bottom rear cab flange replacement

66C10LB,
I had to replace the entire length of mine. It was in worse shape than yours. As stated that is the Cab floor and the back wall of the cab. I took a piece that was in okay shape and went to a local sheet metal shop. I had them bend me up a few pieces (8ft in all) with the right contour. I had to replace sections of the inner (floor) part as well. I cut the flange off. Then trimmed the back wall of the cab up another inch. That gave me the ability to weld on pieces for the floor so I was attaching good metal to good metal. I also cut it out in sections to prevent having problems with the wall sagging below where it should be. I cut out triangle pieces and re welded them to get the rounded parts. Sorry I donít have any picís. Iím no pro but it turned out pretty good. I epoxy primed it after and seam sealed the inner part to try to keep dirt and moisture out. If you have more questions let me know. Iíll try to explain it better if needed. Good luck.

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Old 11-02-2018, 11:31 PM   #12
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Re: Outside bottom rear cab flange replacement

Quote:
Originally Posted by dracko View Post
I made 2 separate orders and ended up with a Counterpart and a TriPlus cab corner, the Counterpart one went in the bin and the TriPlus fit like a glove. I ordered up another TriPlus for the other side. IIRC they arenít too costly.
Thanks Draco for the info re TriPlus. I think that I can get that through KMS Tools in Canada.
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Old 11-02-2018, 11:34 PM   #13
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Re: Outside bottom rear cab flange replacement

Thanks Grounded63. Yes, I may end up not doing the entire length. Thanks for seconding that.
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Old 11-03-2018, 12:02 AM   #14
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Re: Outside bottom rear cab flange replacement

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Originally Posted by Vinceg View Post
66C10LB,
I had to replace the entire length of mine. It was in worse shape than yours. As stated that is the Cab floor and the back wall of the cab. I took a piece that was in okay shape and went to a local sheet metal shop. I had them bend me up a few pieces (8ft in all) with the right contour. I had to replace sections of the inner (floor) part as well. I cut the flange off. Then trimmed the back wall of the cab up another inch. That gave me the ability to weld on pieces for the floor so I was attaching good metal to good metal. I also cut it out in sections to prevent having problems with the wall sagging below where it should be. I cut out triangle pieces and re welded them to get the rounded parts. Sorry I donít have any picís. Iím no pro but it turned out pretty good. I epoxy primed it after and seam sealed the inner part to try to keep dirt and moisture out. If you have more questions let me know. Iíll try to explain it better if needed. Good luck.

Vince
Thanks Vince, For the detailed suggestions. I'll probably do something similar. I like that you replaced the inner (floor) metal as well. I'll let everyone know what I end up doing.
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Old 11-03-2018, 01:12 AM   #15
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Re: Outside bottom rear cab flange replacement

There's a definite difference between the brands.
Triplus is thicker with better contours.
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