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#1 |
Registered User
Join Date: Aug 2017
Location: batavia
Posts: 8
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68 C30 to 85 c30 suspension
Alright guys I'm working on my 68 c30 I got a donor 85 c30 for all front suspension. My true my question is are the c10 and c30 control arms different in 85? Cause if I can run c10 arms I will order some tubulars! Thanks for any info in advance.
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#2 |
Registered User
Join Date: Nov 2001
Location: Concord,NC,USA
Posts: 743
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Re: 68 C30 to 85 c30 suspension
Your truly better off to swap the whole front crossmember.
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#3 |
Registered User
Join Date: Aug 2017
Location: batavia
Posts: 8
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Re: 68 C30 to 85 c30 suspension
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#4 | ||
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: 68 C30 to 85 c30 suspension
Quote:
Quote:
C10 uppers use smaller mounting studs for the shafts & the BJ taper is smaller vs. a C30. Lower arms interchange but the BJ taper could be different (drum brake vs. disc typically are different). Both upper & lower Squarebody model a-arms have/use different bushings . C10's use car style press-in bushings. C20's & 30's use the HD style threaded bushings like 67-72's. Yes the entire x-member can be swapped. Things that might change would be the engine/motor mount perches being @ different heights as Squarebody frames were slightly taller. Physically, the x-member will swap right over & might require reaming a couple of the holes.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#5 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,517
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Re: 68 C30 to 85 c30 suspension
Just finished one yesterday read this
http://67-72chevytrucks.com/vboard/s...d.php?t=803011 |
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#6 | |
Registered User
Join Date: Aug 2017
Location: batavia
Posts: 8
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Re: 68 C30 to 85 c30 suspension
Quote:
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#7 | |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,517
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Re: 68 C30 to 85 c30 suspension
Quote:
I chose to keep the exiting cross member because I saw no reason to change it, to me that was a whole bunch of unnecessary work everything will bolt right up to your existing cross member. I measured the 86 steering link and found it to be 1-1/4" narrower or shorter where the Pitman Arm and Idler Arm mount to the outer tapers so this will automatically throw your steering geometry off, the idler arm for the 86 taper hole where it mounts is also 1 size smaller taper than the 68. The inner tapers where the tie-rods mount are 1/4" shorter/closer together Bottom line is if you keep your 68 cross member you cannot use the 86 steering link, you must reuse your 68. I did not have the 86 donor truck to measure why the difference but I suspect its in where the steering box and idler arm mounts, I don't know and do not want to speculate. I can tell you that what I used lined right up to spec's at the alignment shop. Sorry I couldn't answer directly on what you're wanting to do. |
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#8 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,946
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Re: 68 C30 to 85 c30 suspension
I would ALL the 85 steering parts, including the box. The hydraulic line ends are different, so grab the 85 pump pressure outlet fitting so you can use off the shelf lines for the 85. You also gain a bit quicker ratio with the newer box.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#9 |
Registered User
![]() Join Date: Mar 2017
Location: Port Murray, NJ
Posts: 147
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Re: 68 C30 to 85 c30 suspension
following
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