Offset upper A arm shafts.
Thread Starter
Race Director
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From: Sunshine Coast, Queensland, Australia
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Offset upper A arm shafts.
I know I have seen something in the past wherein offset upper A arm shafts that fit other Chevy's will also fit our C3's. when looking on Summit's site. nothing is listed for C3's.
Certainly someone out there knows what other Chevrolet's take the same upper A arm shaft and or where to get affordable offset upper A arm shafts.
Thanks much for any information.
Certainly someone out there knows what other Chevrolet's take the same upper A arm shaft and or where to get affordable offset upper A arm shafts.
Thanks much for any information.
Last edited by 4-vettes; Jun 23, 2021 at 06:50 AM.
Melting Slicks
Joined: May 2021
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From: Fleming Island, FL
I copied this cross-reference list for you.CHEVROLET BEL AIR 1965-1970 CHEVROLET BISCAYNE 1965-1970 CHEVROLET CAPRICE 1966-1970 CHEVROLET CORVAIR TRUCK 1961-1964 CHEVROLET CORVETTE 1963-1982 CHEVROLET ESTATE 1969-1970 CHEVROLET IMPALA 1965-1970 CHEVROLET KINGSWOOD 1969-1970 CHEVROLET TOWNSMAN 1969-1970
Last edited by Fly skids up!; Jun 23, 2021 at 09:00 AM.
Melting Slicks
Joined: Aug 2013
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From: S Fla
One of the threads here has some great info on this
'tubular a-arms' a few years old but worth the read.
Found these parts I was planning to get for mine..."upper and lower tubular a-arms for 56-64 Chevy Belaire and Biscayne"
'tubular a-arms' a few years old but worth the read.
Found these parts I was planning to get for mine..."upper and lower tubular a-arms for 56-64 Chevy Belaire and Biscayne"
Thread Starter
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Drifting
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What ? Picture is a little deceiving because it's at a angle but even so the outer threaded shaft center line is still below the bolt hole center line plain as day , order up a set at the local parts store , you will be happy
Last edited by Eric P; Jun 24, 2021 at 10:14 AM.
Melting Slicks
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Okay, I looked again. I was looking for offset to achieve more caster. moving the arm rearward, would achive this. moving the arm downwards?? purpose? please explain.
Team Owner
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From: Western NY
As far as I know, the primary task of the Moog "offset" arms is to locate the shafts that the arms pivot on, on an axis that is further outward, in order to correct for "sag" in the frame. The Global West shafts may also have the means built into them to alter the caster, but it's hard to see, in the pictures.
Melting Slicks
Joined: May 2021
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From: Fleming Island, FL
If I recalled the offset shaft or 1/8" shims changes camber by 1 degree. So if a offset shaft is used and two 1/8" shims in the rear, camber should remain the same while increasing positive caster. OP any reason why you feel you need more caster?
Drifting
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I used mine for more Caster when I rebuilt the front end and installed a Core support .... I did my front end restoration of the car first which was front suspension , core support and engine and it had no rear shims for maximum positive Caster already on the front control arms .... It drove nice for dry rotted bushing so I added shims to compensate for the added offset until I had time to rebuild the rear suspension and went 700R4 before doing a 4 wheel alignment which the suspension actually was done last winter ... Fast forward up to a few weeks ago when I did the alignment I was able to get 4.5 degrees positive caster at zero Camber with my black 80 L82 and still have about three shims in the rear where it had none before
Last edited by Eric P; Jun 25, 2021 at 12:55 PM.
Old Pro Solo Guy
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What I found out was the stock arms only let you go to about 2.5 to 3.0 caster. Then you have a lot of rear shims but the limiting problem is you have no shims in front and cannot tilt the a-arm back any further for more caster. (Assuming you are trying to keep your camber where you had it.)
The offset arms let you angle the front in more, and push the ball joint back more, for more caster.
The offset arms let you angle the front in more, and push the ball joint back more, for more caster.
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A few questions to answer. why do I feel need for more caster. Simply put, with my wide tires and the rough roads here in Australia. my steering feels very light. I have a stack of shims on the rear bolts of my upper A arms and none on one side and one on the other. Still inadequate caster. Also no budget for aftermarket A arms. would like to get some caster to put some "feel" into steering. The budget method is to use offset A arm shafts. Big name brand super expensive parts cost 3 times as much for me over here so please spare me. So far part numbers supplied have given me replacement bushings. (No good) And parts that I can not find through google or Summit . A part number that can be found with a Google search or from a company that ships to Australia for a reasonable price would be greatly appreciated. And truthfully, I am still trying to understand how a downward offset can work. really need rearward offset to get more caster. Thanks Guys for any help. I really do have a limited budget. I can pull this apart and put it together. would just like to get rid of this super light feel.
Melting Slicks
Joined: May 2021
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From: Fleming Island, FL
Jegs has them.
https://www.jegs.com/i/Delphi/117/TC6504/10002/-1
While on the subject, I thought I needed the offset shafts. A lower ride height (1 inch) used all of the available adjustment. New springs and correct ride height, plenty adjustment left. And for what it's worth, the non A/C springs gave the correct height in my 82 A/C car. The A/C springs gave it the "Carolina Squat". Didn't mean to hijack, just trying to pass along information.
https://www.jegs.com/i/Delphi/117/TC6504/10002/-1
While on the subject, I thought I needed the offset shafts. A lower ride height (1 inch) used all of the available adjustment. New springs and correct ride height, plenty adjustment left. And for what it's worth, the non A/C springs gave the correct height in my 82 A/C car. The A/C springs gave it the "Carolina Squat". Didn't mean to hijack, just trying to pass along information.
Last edited by Fly skids up!; Jun 26, 2021 at 01:12 PM.
Melting Slicks
Joined: Sep 2016
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From: Wauconda IL
Have you considered slotting the upper control arm shafts to gain more positive caster?
https://www.google.com/search?q=slot...WQWCzEQ4dUDCBA
https://www.google.com/search?q=slot...WQWCzEQ4dUDCBA
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I looked at Jegs link. no photo. nothing in the description says anything about offset. googled the Delphi part number. found a number of places have them. from one photo I found it looks like there offset for camber, not caster. But nothing in the description other than stock replacement. A bit worried about having something shipped overseas that just won't work. Slotting my arms may be the only answer if no one makes them. I do not own a mill nor have access to one. So I would be at the mercy of a machine shop. Most likely cost more than buying new shafts plus the extra down time. So still looking for a affordable shaft offset rearward.