Knuckle stud upgrade |
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jeeper50
Member Sponsor Member Joined: 01 Mar. 2008 Location: Spanish Fort AL Status: Offline Points: 2579 |
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This mod strengthens the mounting point of the spindle, preventing the attaching hardware from pulling the threads out of the knuckle which is what happened to grandpas jeep.
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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Fltfndr
Member Joined: 01 Nov. 2013 Location: Clive, IA Status: Offline Points: 796 |
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I understand using the button heads and the modification to the edges of the cap. I was referring to grinding the ball end of the axle housing itself.
Fltfndr
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Fltfndr
1948 CJ2A Restomod "Six Pac" The object of war is not to die for your country, but make the other bastard die for his. George S. Patton |
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Stev
Member Sponsor Member Joined: 27 July 2016 Location: Cincinnati Status: Offline Points: 2389 |
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There are probably two benefits to grinding the bosses flat inside of the steering knuckle:
1. The button head bolts are a little more out of the way from the spinning axle join. 2. Full contact with the flat surface of the button helps with the frustum strength of the bolt compressing the assembly. Look at slides 8 and 9
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Stev
1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored |
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wheelie
Member Sponsor Member Joined: 25 Jan. 2011 Location: red lion. pa Status: Offline Points: 814 |
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I did the job on a Dana 27......Spicer axles. I ground the housing because I was not comfortable grinding too much off the button head cap screw.
I mounted the knuckles (with the seal in place) on the axle and marked the location of the knuckle seals at full lock in each direction to assure that I would not grind to much of the ball away and create a breach of the sealing surface. I don't recall if I could grind the ball with the seal removed from the knuckle or if I took the knuckle off and on and off and on etc., etc as I checked for clearance.
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unclemoak
Member Joined: 06 Oct. 2018 Location: Englewood, CO Status: Offline Points: 352 |
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The style of axle shaft doesn’t make a difference. This upgrade strengthens the joint between the knuckle and the spindle.
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Fltfndr
Member Joined: 01 Nov. 2013 Location: Clive, IA Status: Offline Points: 796 |
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Do you have any specific measurements of how much material to remove from the ball end of the axle housing? Also any description of where to remove. I have the button heads done and installed and too chicken to just start blindly grinding on the housing.
Fltfndr
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Fltfndr
1948 CJ2A Restomod "Six Pac" The object of war is not to die for your country, but make the other bastard die for his. George S. Patton |
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Stev
Member Sponsor Member Joined: 27 July 2016 Location: Cincinnati Status: Offline Points: 2389 |
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The factory set up is a "Tapped Joint" the button head bolt is a "Bolt With Nut"
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Stev
1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored |
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Fltfndr
Member Joined: 01 Nov. 2013 Location: Clive, IA Status: Offline Points: 796 |
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Way above my pay grade. I am not dealing with the bolts, only the ball end of the axle housing
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Fltfndr
1948 CJ2A Restomod "Six Pac" The object of war is not to die for your country, but make the other bastard die for his. George S. Patton |
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jeeper50
Member Sponsor Member Joined: 01 Mar. 2008 Location: Spanish Fort AL Status: Offline Points: 2579 |
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The best way to figure out where and how much to remove, involves installing knuckle after installing button head bolts into knuckle and installing knuckle without spindle to be able to see where the bolts contacts axle housing. Looking inside as the knuckle is rotated side to side to indicate if you need to remove a bit more to clear the head. In the axle pic you can see the small area on front and rear of the outer edge that he ground on for clearance.
Without using a formula to show it
Edited by jeeper50 - 13 Feb. 2020 at 10:22pm |
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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oldtime
Member Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4184 |
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Just remove the minimum amount of casting to get a flat face for the bolt head to seat upon.
Then assemble knuckle to hemisphere to make sure knuckles will swing a full 29* without interference. 29* is required for Rzeppa shafts at maximum steer angle. 27-1/2* for Spicer shafts at maximum steer angle. 23* for Bendix shafts at maximum steer angle. |
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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Fltfndr
Member Joined: 01 Nov. 2013 Location: Clive, IA Status: Offline Points: 796 |
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Can you remove some material from the top of the buttonhead screw in addition to the edge of the screw?
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Fltfndr
1948 CJ2A Restomod "Six Pac" The object of war is not to die for your country, but make the other bastard die for his. George S. Patton |
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Nothing Special
Member Joined: 02 Feb. 2018 Location: Roseville, MN Status: Offline Points: 843 |
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Is everyone talking about the same thing here? To me it doesn't seem so. These two posters sound like they are addressing the rotating part of the axle contacting the heads of the bolts"
But these two seem to be talking about making room to install the bolts in the first place:
If I'm misunderstanding someone I apologize. But if others are misunderstanding each other maybe this will help. (oldtime might be getting back to Fltfndr's issue when he goes on to say:)
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oldtime
Member Joined: 12 Sep. 2009 Location: Missouri Status: Offline Points: 4184 |
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On my conversion I milled the minimum amount of material to get a flat surface. I use a drill press with a 1/2" end mill. I just manually slid the casting about by hand on top the drill press table. Cast iron machine very easily ! I did not need to grind any off the the button heads and can easily turn the knuckles 30* either way after assembly was complete. Note: one of mine is a "double knuckle" and so that's why the machining looks so different between them. |
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Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963) Zero aftermarket parts |
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Stev
Member Sponsor Member Joined: 27 July 2016 Location: Cincinnati Status: Offline Points: 2389 |
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Sorry if we got off track. In the old days when doing this conversion (to decrease the chances of the tapped holes in the casting failing) it was done with regular bolts and the process involved grind mainly the bolts at 3 and 9 o'clock - if I remember the process correctly. Button head bolts don't have high edges and corners so grinding should be minimal.
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Stev
1946 CJ2A Trail Jeep (The Saint), 1948 CJ2A Lefty Restored |
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wheelie
Member Sponsor Member Joined: 25 Jan. 2011 Location: red lion. pa Status: Offline Points: 814 |
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I ground a little off the button head cap screws and also a little off the ball ends of the axle housing.
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drm101
Member Joined: 12 Dec. 2012 Location: Clarkston, MI Status: Offline Points: 1470 |
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Nice video Unclemoak!
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Dean
'47 CJ2A "Ron" '66 CJ5 "Buckie" The less the Power the More the Force |
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masscj2a
Member Joined: 25 Sep. 2013 Location: Chester Mass Status: Offline Points: 793 |
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Great video, thanks for doing that.
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1946 CJ2a Dauntless aka Jalopy
1946 VEC stock 1981 CJ-8 5.3 LS 1966 CJ-6 SBC TUX 1968 CJ-6 225 V6 1974 CJ-6 4.2 1967 M-416 East Coast Modified CJ's |
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TXtea
Member Joined: 21 Mar. 2017 Location: Dallas Status: Offline Points: 156 |
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So I was looking over this mod and I really like it. Thanks for the video Unclemoak. But I was wondering if anyone has done this with the Tracker disc conversion? I've got a 1/2" thick disc mount that also bolts to the spindle, so I will need longer bolts, but wanted to make sure the excess bolt length will not interfere with the hub. I have very little clearance right now, so I'm sure it will be closer after this mod.
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Ryan
'48 CJ2A SN: 161039 |
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