Spindle Material.
Thread Starter
Junior Member
Joined: Oct 2017
Posts: 3
Likes: 0
From: McDonough, GA
Car: 1991 Camaro RS
Engine: ZZ4 350 swapped
Transmission: TH700R4
Axle/Gears: 3.23
Spindle Material.
Just wondering what would be the best material to use to fabricate a spindle. I was thinking it might be a good way to make mounting 6th gen brakes and wheels if I fabricobbled a fresh spindle around the 6th gen hub. or possibly even control arms around a 6th gen spindle. I am a welder by education, but a parts salesman by profession. I weld almost daily so Im not worried whether I could weld it and it be safe, just whether mild steel is strong enough or would I want to use chromoly.
Thread Starter
Junior Member
Joined: Oct 2017
Posts: 3
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: ZZ4 350 swapped
Transmission: TH700R4
Axle/Gears: 3.23
Re: Spindle Material.
They always seemed like cast steel to me. I meant more aftermarket type spindles and a arms. I was thinking chromoly. Im going to move forward with it sometime in March, just waiting for a 6th gen to hit a junk yard.
Member

Joined: Jul 2015
Posts: 131
Likes: 6
From: Vancouver, Canada
Car: 88 Trans am
Transmission: T56
Axle/Gears: C4 IRS 3.42
Re: Spindle Material.
GM spindles used to be forged back in the 60's. One piece.
Sometime around 1970 they went to cast iron with a pressed in steel bearing shaft.
Sometime around 1970 they went to cast iron with a pressed in steel bearing shaft.
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Spindle Material.
Just wondering what would be the best material to use to fabricate a spindle. I was thinking it might be a good way to make mounting 6th gen brakes and wheels if I fabricobbled a fresh spindle around the 6th gen hub. or possibly even control arms around a 6th gen spindle. I am a welder by education, but a parts salesman by profession. I weld almost daily so Im not worried whether I could weld it and it be safe, just whether mild steel is strong enough or would I want to use chromoly.
https://www.thirdgen.org/forums/afte...ing-1-8-a.html
I don't understand why they don't make them to accept an LSx wheel bearing and caliper though...
-- Joe
Joined: Aug 2006
Posts: 12,789
Likes: 94
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Spindle Material.
If I was to build a spindle, I would stay with mild steel. Chromoly can be brittle if welded improperly and in a hard impact more likely to break than bend.
As for the hub. It would be easier to build the spindle to work with the later unit hub assemblies, however the older servicable tapered bearing floating hubs these cars came with and far stronger and more reliable.
As for the hub. It would be easier to build the spindle to work with the later unit hub assemblies, however the older servicable tapered bearing floating hubs these cars came with and far stronger and more reliable.
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Spindle Material.
If I was to build a spindle, I would stay with mild steel. Chromoly can be brittle if welded improperly and in a hard impact more likely to break than bend.
As for the hub. It would be easier to build the spindle to work with the later unit hub assemblies, however the older servicable tapered bearing floating hubs these cars came with and far stronger and more reliable.
As for the hub. It would be easier to build the spindle to work with the later unit hub assemblies, however the older servicable tapered bearing floating hubs these cars came with and far stronger and more reliable.
I'd rather have it setup for LSx or C4 brakes.
-- Joe
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Joined: Aug 2006
Posts: 12,789
Likes: 94
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Spindle Material.
I didn't mean the stock 10.5" brakes, just the floating design of the hub. As for service its a bit messy because of the grease, but rather replace a rotor hub assembly any day than some of the newer press in hubs. And even a good quality stock rotor can last 100k miles so its not like it needs to be done often. Either way its all beside the point, I said if "I" was going to make a spindle, and these are my recommendations.
Thread Starter
Junior Member
Joined: Oct 2017
Posts: 3
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From: McDonough, GA
Car: 1991 Camaro RS
Engine: ZZ4 350 swapped
Transmission: TH700R4
Axle/Gears: 3.23
Re: Spindle Material.
I intend to make it fit the 6th gen camaro hub, i have two sets of front rotor and caliper take offs, and a set of 20s as well. should stop reasonably well, and hopefully not nee the spacers to run the 20s. i sell car parts for a living but went to school for weld, and thats where i make my play money.
Joined: Oct 2012
Posts: 143
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From: Montreal, QC, Canada
Car: 1987 GTA, Digital Dash
Engine: L98 TPI
Transmission: 1994 LT1 T56
Axle/Gears: 9 bolt, 3.27
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Joined: Jun 2001
Posts: 8,023
Likes: 90
From: DC Metro Area
Car: 87TA 87Form 71Mach1 93FleetWB 04Cum
Joined: Sep 1999
Posts: 4,353
Likes: 308
From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: Spindle Material.
Even the C5/C6 unit hubs suck, and the replacements are worse. There is one company that makes a worth while replacement, but I forget which one
Gentlemeeeeeeeen! Welcome to the empire of dirt. Today we have a treat especial
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Spindle Material.
Because they suck if you do more than just daily drive. Last I looked they were trying to get SCCA to let 4th gen owners to allow them to run a conversion spindle so they could get a tapered roller bearing.
Even the C5/C6 unit hubs suck, and the replacements are worse. There is one company that makes a worth while replacement, but I forget which one
Even the C5/C6 unit hubs suck, and the replacements are worse. There is one company that makes a worth while replacement, but I forget which one
But again, I'm not an SCCA racer. Just a guy who likes driving on the street, and would rather do knock-off rotors and pads than the silly thirdgen type.
-- Joe
Joined: May 2013
Posts: 1,493
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From: CT
Car: 86 Trans Am WS6
Engine: 383 stroker
Transmission: 700r4
Axle/Gears: 9 Bolt Torsen 3.70
Joined: Mar 2001
Posts: 10,396
Likes: 2,067
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Spindle Material.
You know it takes more than a welder to create a spindle. Takes real engineering skills that most people don't have. This isn't just a statement.... it's a legitimate warning.
I think Kore3 is the place that somebody was thinking of earlier.
Your 3rd gen spindles can be modified to accept modern brakes. Call Scott at http://bigbrakeupgrade.com and he'll take care of that for you. Kore3 might make you a hub with the 6th gen 5x120 bolt pattern if that is the direction you really want to go. http://www.kore3.com/
I think Kore3 is the place that somebody was thinking of earlier.
Your 3rd gen spindles can be modified to accept modern brakes. Call Scott at http://bigbrakeupgrade.com and he'll take care of that for you. Kore3 might make you a hub with the 6th gen 5x120 bolt pattern if that is the direction you really want to go. http://www.kore3.com/
Last edited by QwkTrip; Apr 7, 2018 at 11:46 PM.
Joined: Aug 2006
Posts: 12,789
Likes: 94
From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Spindle Material.
For the record, kore3 will modify the hub any way you want. Different pattern, offset material ect. It's a much safer way to go than making a new spindle. Besides, they will outlast any modern unit hub.
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Spindle Material.
You know it takes more than a welder to create a spindle. Takes real engineering skills that most people don't have. This isn't just a statement.... it's a legitimate warning.
I think Kore3 is the place that somebody was thinking of earlier.
Your 3rd gen spindles can be modified to accept modern brakes. Call Scott at http://bigbrakeupgrade.com and he'll take care of that for you. Kore3 might make you a hub with the 6th gen 5x120 bolt pattern if that is the direction you really want to go. http://www.kore3.com/
I think Kore3 is the place that somebody was thinking of earlier.
Your 3rd gen spindles can be modified to accept modern brakes. Call Scott at http://bigbrakeupgrade.com and he'll take care of that for you. Kore3 might make you a hub with the 6th gen 5x120 bolt pattern if that is the direction you really want to go. http://www.kore3.com/
Joined: Sep 2010
Posts: 1,626
Likes: 46
From: Double Bratville
Car: '89 Formula
Engine: LS2
Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt
Joined: Sep 1999
Posts: 4,353
Likes: 308
From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Member


Joined: Feb 2006
Posts: 188
Likes: 9
From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Member
Joined: Oct 2011
Posts: 226
Likes: 0
From: Black Hills
Car: 88 rs
Engine: ls1
Transmission: t56
Axle/Gears: moser 4:10
Member
Joined: Oct 2011
Posts: 226
Likes: 0
From: Black Hills
Car: 88 rs
Engine: ls1
Transmission: t56
Axle/Gears: moser 4:10
Re: Spindle Material.
It's hard to post things on this sight. As you can see of the 6 posts 2 are criticizing what they saw. If they asked about what they were seeing I would be glad to explain. I'm not sure the reason for the hostility, but it seems odd.
Member


Joined: Feb 2006
Posts: 188
Likes: 9
From: Myrtle Beach SC
Car: 1992 Pontiac Trans Am Convertible
Engine: 6.0l LQ4
Transmission: T56
Axle/Gears: 3.73 True Trac
Re: Spindle Material.
Yeah I don't understand that either we are all here to learn and make these cars better not bash peoples ideas but talk it thru logically and with respect. Feel free to PM me I am always open to learning something new.
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Member
Joined: Oct 2011
Posts: 226
Likes: 0
From: Black Hills
Car: 88 rs
Engine: ls1
Transmission: t56
Axle/Gears: moser 4:10
Re: Spindle Material.
Actually the the lower plate is at a 13 degree angle to the upright, that is the same as the original spindle. It has to be that way to keep the LBJ in line with the upper strut mount. There is a slug welded where the outer tie rod mounts and like you say it is bored to get the angle right. In the pic the suspension is at full droop and it makes the angle look a little worse.
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Spindle Material.
Actually the the lower plate is at a 13 degree angle to the upright, that is the same as the original spindle. It has to be that way to keep the LBJ in line with the upper strut mount. There is a slug welded where the outer tie rod mounts and like you say it is bored to get the angle right. In the pic the suspension is at full droop and it makes the angle look a little worse.
-- Joe
Member
Joined: Oct 2011
Posts: 226
Likes: 0
From: Black Hills
Car: 88 rs
Engine: ls1
Transmission: t56
Axle/Gears: moser 4:10
Re: Spindle Material.
The upright is 90 degrees to the ground (minus any camber) and the lower plate is 13 degrees off of that. The 13 degrees is to account for the KPI or king pin angle, that keeps the LBJ pointing at the the upper strut bushing. The LBJ and the outer tie rod end are on different planes. The LBJ is 13 and the OBJ is vertical. The pic is not showing the angle very well I guess.
Joined: Sep 1999
Posts: 4,353
Likes: 308
From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Joined: Jul 1999
Posts: 12,086
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: Spindle Material.
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