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10-20-2014, 12:36 PM | #1 |
Registered User
Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: DIY Disc Brake Conversion
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10-21-2014, 09:48 PM | #2 |
Registered User
Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: DIY Disc Brake Conversion
Hey guys
I understand this thread was made for 8 lug trucks. Which tend to have the same steering setup as well. So I was hoping I could get some help in that respect as well. If anyone would be so kind, I need to know the distance from center to center of the ball joints the drag link attaches to. Basically the distance between the green lines but in the stock position. |
10-21-2014, 10:50 PM | #3 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,131
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Re: DIY Disc Brake Conversion
12" , Why so far ahead of where it was?
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10-23-2014, 11:55 AM | #4 |
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Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: DIY Disc Brake Conversion
Thanks Dave!
I have it that far forward because I can't fit anything on the frame next to the motor. The picture is of when I first had the motor in the frame, and I realized how little room I had. It's funny though. Where it is at now, it needs to be shortened about 3/4". I have one more question. The angle of the pitman arm seems kinda steep for going straight. Do you think I should have the pitman going more vertical? |
10-23-2014, 01:17 PM | #5 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,131
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Re: DIY Disc Brake Conversion
The more level the drag link the less chances for bump steer. What will happen is the axle goes up or down and it moves the steering arm forward or backward just slightly but enough to make a change in direction. That's how you get bump steer on a straight axle. Jack up the front axle and have all the weight on it and see where it ends up. The Pittman arm should be in the middle of lock to lock and straight down when centered. This way you don't pull the drag link to a steep angle when you turn.
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10-23-2014, 01:21 PM | #6 |
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Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: DIY Disc Brake Conversion
Alright thanks again.
Yeah I knew they had to be level, and they are within 1/2", I figured I was pretty spot on. yeah, right now that drag link goes just about points straight forward when I turn it to left lock. |
10-26-2014, 10:06 PM | #7 |
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Join Date: Jan 2007
Location: tacoma wa.
Posts: 1,037
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Re: DIY Disc Brake Conversion
toyota 4x4 box pre 1986 will sit on top of frame and clear V8!
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10-27-2014, 01:58 AM | #8 |
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Join Date: Jul 2012
Location: Payette, Id
Posts: 32
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Re: DIY Disc Brake Conversion
55dude,
On that pre 1986 Toyota 4 x 4 steering box, is that the non-power steering box or power steering box that fits with a V8? My 47 AD will have a 265 V8 with the log style headers. I have seen a couple of pictures of these steering boxes before but couldn't tell if it actually allowed more room next to the header. If the power steering box mounts in the same spot as the stock box and would clear the header that would be an excellent problem solver. I think I had looked at Golden State Pickup Parts online some time ago and saw that they sell a kit (very expensive) for this upgrade. Dan
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1947 AD 3100 |
10-27-2014, 10:15 AM | #9 |
Registered User
Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: DIY Disc Brake Conversion
55dude,
it may fit otherwise, but I have my motor mounted awfully low. I need to trim the frame just a little bit so I can bolt on my exhaust. it's so close. Dan I believe they're the power steering units. (i forgot why but) I believe the reason I didn't use that box is because I want manual steering. |
11-12-2014, 01:44 PM | #10 |
Registered User
Join Date: Nov 2014
Location: Pueblo West, CO
Posts: 10
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Re: DIY Disc Brake Conversion
Hey Mike,
Did you have a chance to see if those brackets fit? I am waiting to see your results before I purchase mine. Been reading around the site for a while and finally decided to join. Nate |
11-12-2014, 02:04 PM | #11 |
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Join Date: Nov 2014
Location: Pueblo West, CO
Posts: 10
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Re: DIY Disc Brake Conversion
Nick,
My brakes were almost in the same condition as yours when you started. I am stuck at the backing plate. How do these last two bottom bolts come out? They seem to go through to the other side and attach the steering linkage. I have tried everything and I am at the point where I will torch them off. Sorry, I had to take the picture upside down... Any help would be great. Thanks, Nate |
11-12-2014, 08:11 PM | #12 | |
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Join Date: Nov 2013
Location: Mechanicville NY (upstate)
Posts: 191
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Re: DIY Disc Brake Conversion
Quote:
MikeC |
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11-12-2014, 05:44 PM | #13 |
Registered User
Join Date: Sep 2012
Location: Mt. Prospect, ILL
Posts: 820
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Re: DIY Disc Brake Conversion
You're right.
They do go through. It should be a stud with two nuts on either end. One for the steering linkage and one for the backing plate. I'll see if I can take a picture of mine next time I come home from school. If it's spinning while you're cranking on it, there is a section of the bolt behind the steering arm that you can put a wrench on. I hope that helps. If it doesn't. let me know, I'll find a way to show it. Thanks for the interest, |
11-13-2014, 11:30 PM | #14 | |
Registered User
Join Date: Nov 2014
Location: Pueblo West, CO
Posts: 10
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Re: DIY Disc Brake Conversion
Quote:
I was able, with the help of a large hammer, got the bolts out. I guess 60 years of rust was holding them in. Now onto the rebuild. Also, do you know if the king pin is the same on a 3/4 vs 1/2ton? I think I may need to replace one and the 1/2 tons are a lot easier to find. Nate |
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11-14-2014, 01:50 AM | #15 |
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Join Date: Sep 2011
Location: Nevada City, CA
Posts: 908
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Re: DIY Disc Brake Conversion
They aren't. 3/4 and 1 ton are .921". I don't recall what that comes to in fractions. Anyway, try rockauto.com - it's a clunky website but has darned near anything you'd ever need.
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"Over my head" 1957 Chevy 3200, big rear window & 6 lug. Front disc, power steering, Vortec 4.8 / 4L60E swap, hydro boost brakes & patina. |
11-14-2014, 01:59 AM | #16 |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,131
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Re: DIY Disc Brake Conversion
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11-14-2014, 08:27 PM | #17 |
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Join Date: Sep 2011
Location: Nevada City, CA
Posts: 908
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Re: DIY Disc Brake Conversion
I might be barking up the wrong tree but I noticed Speedway's 1/2 ton hub kit (billet hubs) used easily found 3500 lb trailer axle bearings.
I wonder if a trailer bearing & race set could be found that would either tap into place or wouldn't take too much machine work on the heavier hubs? Depending on local labor costs, might be cheaper / easier than tracking down a custom bearing.
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"Over my head" 1957 Chevy 3200, big rear window & 6 lug. Front disc, power steering, Vortec 4.8 / 4L60E swap, hydro boost brakes & patina. |
11-15-2014, 09:17 PM | #18 |
Registered User
Join Date: Nov 2014
Location: Pueblo West, CO
Posts: 10
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Re: DIY Disc Brake Conversion
Well I found the actual site for chevsofthe40s.com. They do have the roller bearings in stock but they are about 220.00/side. Not what I want to pay but I want to make sure that I have everything and that its safe.
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11-16-2014, 01:11 AM | #19 |
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Join Date: Feb 2009
Location: Glendale, Az
Posts: 1,062
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Re: DIY Disc Brake Conversion
that's ridiculous. buy one side and get the numbers off the bearings.
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11-16-2014, 02:53 PM | #20 |
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Join Date: Dec 2012
Location: North Carolina
Posts: 4,989
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Re: DIY Disc Brake Conversion
Can the original rims fit on these updates?
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1971 GMC Sierra 1959 GMC 100 |
11-16-2014, 03:57 PM | #21 |
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Join Date: Jun 2006
Location: Idaho
Posts: 8,800
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Re: DIY Disc Brake Conversion
Usually not, the inner part of the wheel has to have a different profile to clear the calipers, I found that out on mine, 59 wheels would not work with 74 front hubs and calipers.
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1959 Chevy Short Fleetside w/ 74 4WD drive train (current project) OrrieG Build Thread 1964 Chevelle Malibu w/ 355-350TH (daily driver) Helpful AD and TF Manual Site Old Car Manual Project |
12-15-2014, 10:33 AM | #22 |
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Join Date: Nov 2014
Location: Pueblo West, CO
Posts: 10
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Re: DIY Disc Brake Conversion
Does anyone have any updates for the disc brakes? I'm thinking about getting the brackets that Mike got from ebay. I need to get moving on my truck in order to meet my May goal of being on the road.
Also, has anyone found the kingpins with the needle bearings for the 3/4 ton truck? I have found them for the 1/2 ton but not the 3/4. Anyone else find the tapered roller bearings for the wheels for a "reasonable" price? Nate |
12-15-2014, 12:09 PM | #23 | |
Hollister Road Co.
Join Date: Apr 2005
Location: Houston
Posts: 6,131
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Re: DIY Disc Brake Conversion
Quote:
You don't have to convert to taper wheel bearings. The ball bearing is rated correctly for your truck and the disc addition doesn't change that. As long as they are in good shape leave them. We have been selling 3/4 and one tom kits for a while now. |
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12-15-2014, 12:33 PM | #24 |
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Join Date: Nov 2014
Location: Pueblo West, CO
Posts: 10
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Re: DIY Disc Brake Conversion
I have seen kits with the needle bearings in place of the copper sleeves that go into the axle. At least that's how it am interpreting it. I have read that the ball bearings are not good or will not work with the disc brakes and are the ball bearings ok for "today's" highway speeds?
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12-16-2014, 05:00 PM | #25 |
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Join Date: Apr 2009
Location: NE Indiana
Posts: 28
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Re: DIY Disc Brake Conversion
This may save allot of time or aggravation: I have a 1/2 ton, so I don't need this, but I'm aware many with 3/4 ton would like discs.
1947 - 59 3/4 & One Ton Chevy GMC Truck Disc Brake Conversion Front Disc Brake Caliper Bracket Kit http://www.thehollisterroadcompany.c...converion.html |
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