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Old 05-21-2018, 10:33 AM   #326
1971_c10
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Hey guys, after the C10 Nationals and during post-race inspections, I found the bottom rod ends on my front anti-rollbar links were bent.

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Usually bent rod ends are caused by a mis-alignment situation. No different in my case. So after some playing with the suspension I found the cause of the mis-alignment. I walk through the whole process here. If you've got the flat bent bar arms that look like this:

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Then you might want to watch this:

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Old 05-21-2018, 03:31 PM   #327
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Nice vid, I would not have though about the arm curvature changing the mounting surface angle through suspension travel! Check out "high misalignment spacer" for that upper rod end, should be all that you need to get enough travel.
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Old 05-21-2018, 04:52 PM   #328
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Quote:
Originally Posted by crakarjax View Post
Nice vid, I would not have though about the arm curvature changing the mounting surface angle through suspension travel! Check out "high misalignment spacer" for that upper rod end, should be all that you need to get enough travel.
Thanks man! I didn't think about the arc either (even though I should have). When I dug into the suspension I was like doh! dumba$#! I looked at the high misalignment spacers but they insert into the ball and reduce the bore diameter plus I needed 2 new rod ends anyhow so I found some QA1 (shh, don't tell Rob) high misalignment rod ends I'm going to give a try.
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Old 05-24-2018, 06:19 AM   #329
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

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Thanks Boss! I haven't gotten in to the rear end yet but interesting enough the ARP kit includes flat washers where the current studs use lock(split) washers. Hmm. I think I swap out all the studs and do the RTV trick. I'm sick of this thing leaking! lol
Welll.....little blush here...more than a week later and mine started leaking again, spoke to the hogsheads builder and he suggested that the bolts in the housing werenít torqued properly...Iíll have to call back. My bolts had the flat bronze(?) washer plus the split....Iíll update after I call
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Old 05-24-2018, 07:57 PM   #330
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Perhaps heat the sway arm and clock (bend) the end a little to reduce the angle between it and the upper A-arm. High misalignment spacers would work but I would think the other option would be better.
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Old 05-25-2018, 08:14 AM   #331
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Have you spoken to Rob since it is his frame/suspension design about the problem? it might be something he has not seen yet or may even have a fix for it...
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Old 05-25-2018, 08:26 PM   #332
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

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Perhaps heat the sway arm and clock (bend) the end a little to reduce the angle between it and the upper A-arm. High misalignment spacers would work but I would think the other option would be better.
That bar arm is aluminum. I don't have enough experience hot working aluminum to even want to try. I got the high misalignment rod ends in this week. I'm a little behind on getting stuff done as I've got the rear end torn apart at the moment, but I plan to pull a coil over and cycle the suspension with the new rod end in a see how it looks.

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Have you spoken to Rob since it is his frame/suspension design about the problem? it might be something he has not seen yet or may even have a fix for it...
Not yet ... he is very hard to get ahold of during the summer as he goes to many events on the weekends (and starts on Thursday/Friday). For example, I think he's in Missouri at the NSRA event there this weekend. The easiest way in fact is to find him at an event. I talked with him a bunch at the C10 Nationals. Once I give this slightly mod'd setup a try I'll at least shoot him an email with what I found and what I did since a recent photo from the shop shows some of the chassis setups still use the same bar arm on the 3 piece front bars so it would seemingly have the same problem.
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Old 05-25-2018, 09:53 PM   #333
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

I'm sure that at no limit's scale each chassis is different and they are always evolving, so letting him know is pretty likely to result in some positive changes to their builds.
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Old 05-28-2018, 04:46 PM   #334
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

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I'm sure that at no limit's scale each chassis is different and they are always evolving, so letting him know is pretty likely to result in some positive changes to their builds.
Yep, for sure. I got the rod ends in and things look a bit better. Time and beating on it will tell, but no binding rod ands anymore.

A follow up video I tossed together today:
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Old 05-28-2018, 05:05 PM   #335
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Oh, and another follow up... leaky 3rd member.

So I tore the rear end apart (this time I decided to go way down and pulled the brakes off to re-align the calipers a little better) and went to town. I decided while I had the 3rd member out I'd throw some paint on, so I did that first.

On to the leak. Turns out is was leaking from the gasket for sure and I wasn't quite sure if it was also leaking from the stud. So on re-assembly, I decided to just do RTV on the gasket first. So I applied some black RTV in a very thin layer to both sides of the gasket. Installed the 3rd member, but did not reseat the axles and left the driveshaft disconnected and just hand tightened all the nuts to where they were snug. I then let the housing sit one hour before torquing everything to the 35 ft-lb spec. After torquing, I let the housing sit for a good 14 hours before I filled with fluid.

Once I filled it with fluid I figured it would be about 2 hours before a leak started if one where to start (based on the last time I did this). Sure enough, it was leaking. Although this time I got lucky and as I crawled under the truck I got to witness a drop of fluid seeping out through the threads at the end of the nut. Not even through the split in the lock washer, but through the threads. Grrr.

So mod to this round, I pulled the nut, lock washer and copper washer on just that stud. I then put black RTV on both sides of the copper washer. Since this isn't inside the housing, I was very liberal with the RTV. I put the copper washer back on then put a gob of ARP thread sealant on the stud and put the lock washer/nut back on and re-torqued. I did this whole procedure very fast as the drip was at a rate of about one every 5 min, so I had limited time before more oil started to mix with my uncured RTV.

Well, so far so good. No leaks and I've gotten 2 thermal cycles on the rear end (get it hot by driving then let it cool). I'm still not 100% on this solution but it's working for now. If it start leaking again I'm going to need to take a real close look at the interface between the stud head and axle housing to see why it is leaking. We run metal to metal joints all over the jet engines I design and we don't have leaks on joints with upwards of 800 psi on them. Hmmm.

Ok, now rant, there are 4 studs below the fluid line, why this one leaks and the other 3 do not is beyond me. Frustrating for sure as it is a PIA to be pulling the 3rd member every couple weeks. But it's just ammo against my Ford buddies. Only leak I have on the entire truck is from the dang Ford part (of course none of it is Ford parts, but it's still a good jab).
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Old 05-28-2018, 06:05 PM   #336
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Re: C10CJ: A Pro-touring '71 Stepside on a No Limit Pro-C10 Chassis

Hopefully that will get it...a good diagnostic approach and a logical repair. Admiring your tenacity. Good quality for a jet engine designer!
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