Front Control Arm Bolt Size?
01-14-2011, 10:50 AM
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Car: '91 TA vert
Engine: turboLSx
Transmission: T56
Axle/Gears: 3.23
Front Control Arm Bolt Size?
If the size is somewhere on this site, my search-fu is weak. I'm swapping out control arms for ones with new bushings/balljoints/etc and I'd like to replace the bolts as well. Can't find the size anywhere and no second car to use after I pop the factory ones off. If I wasn't doing this job today/tomorrow I would've just ordered a set from Spohn or something. Any help would be appreciated!
01-14-2011, 10:59 AM
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: Front Control Arm Bolt Size?
they are 12mm diameter grade 10.9, you can measure the length and find something close. I can get you a better idea later if nobody else chimes in.
01-14-2011, 11:51 AM
#3
Re: Front Control Arm Bolt Size?
From GM.
Nut 11516073
Bolt 11502603
Bolt 11500952
Bolt, Hex (M12 x 1.75 x 95) and the other is Bolt, Hex (M12 x 1.75 x 115).
The above from my 82-85 Parts & Illustration Cat., which shows the two bolts as different sizes--and the ones I put on my 85 IROC are different. Spohn's site, for what it's worth, shows two sizes as well. My 82-91 Parts & Illustration Cat., however, shows only one part number, 11502603 (M12 x 1.75 x 95).
JamesC
Nut 11516073
Bolt 11502603
Bolt 11500952
Bolt, Hex (M12 x 1.75 x 95) and the other is Bolt, Hex (M12 x 1.75 x 115).
The above from my 82-85 Parts & Illustration Cat., which shows the two bolts as different sizes--and the ones I put on my 85 IROC are different. Spohn's site, for what it's worth, shows two sizes as well. My 82-91 Parts & Illustration Cat., however, shows only one part number, 11502603 (M12 x 1.75 x 95).
JamesC
Last edited by JamesC; 01-14-2011 at 02:16 PM.
01-14-2011, 01:50 PM
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Car: '91 TA vert
Engine: turboLSx
Transmission: T56
Axle/Gears: 3.23
Re: Front Control Arm Bolt Size?
Suh-weet. Thanks! I'll hit up Tacoma Screw or something and pick up both sizes to be safe. Looking at the bushings I think I'll need both. One of the bushings was significantly longer than the other.
01-14-2011, 03:51 PM
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Car: '91 TA vert
Engine: turboLSx
Transmission: T56
Axle/Gears: 3.23
Re: Front Control Arm Bolt Size?
Are full threaded bolts okay or should I go for the OE style shanked? I would imagine fully threaded bolts would wear prematurely?
01-14-2011, 05:03 PM
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Car: 86 Trans Am, 92 Firebird
Engine: 408 sbc, 3.1L of raw power
Transmission: TKO600, T5
Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion
Re: Front Control Arm Bolt Size?
i would pass on the all threaded bolts, but be sure the bolts you buy are of the proper hardness, grade 10.9 at least.
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01-15-2011, 12:47 AM
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Car: '91 TA vert
Engine: turboLSx
Transmission: T56
Axle/Gears: 3.23
Re: Front Control Arm Bolt Size?
Wait, so grade 5 isn't good enough? 
Yeah, I absolutely thrash my car so I'm not going to be trusting the main front suspension piece to undersized hardware. Thanks.I succumb to getting the exact right bolt and ordered the hardware set from Spohn. As much as I'd rather avoid it I postponed the install for a bit. But I went ahead and also ordered replacement rod ends for the rear control arms/panhard so I'll put those on as well. For some reason the driver side LCA had a ton more slop than the passenger.
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