C30 U-bolts vs. C20 U-bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

EricS76 · 02-08-2006, 09:13 PM

I'm in the process of putting a 14 bolt axle under my C-10. The problem I have is that the C-10 ubolts won't work because the 14 bolt's tube diameter is larger, and the C-30(donor truck) ubolts won't work because they're for 3 inch wide springs, and they bolt on upside down (they are square ubolts, and the threads point down). There are ubolts and spring plates in LMC for C20's. My questions are, are C-20 springs 3in. wide or 2.5in. wide? And, do C-20's use ubolts with the threads up (like a C-10) or square ones, with the threads down (like a C-30)?

EricS76 · 02-09-2006, 09:53 AM

How about just what is the width of a C-20 spring? 2.5 or 3 inches?

MylilBowTie · 02-10-2006, 12:34 PM

My 86 C20 3/4 leafsprings are 2.5 inches wide.

EricS76 · 02-10-2006, 01:28 PM

Thanks for the info.

02-08-2006, 09:13 PM	#1
EricS76 Registered User Join Date: May 2004 Location: Llano,TX Posts: 113	C30 U-bolts vs. C20 U-bolts I'm in the process of putting a 14 bolt axle under my C-10. The problem I have is that the C-10 ubolts won't work because the 14 bolt's tube diameter is larger, and the C-30(donor truck) ubolts won't work because they're for 3 inch wide springs, and they bolt on upside down (they are square ubolts, and the threads point down). There are ubolts and spring plates in LMC for C20's. My questions are, are C-20 springs 3in. wide or 2.5in. wide? And, do C-20's use ubolts with the threads up (like a C-10) or square ones, with the threads down (like a C-30)? __________________ ‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71…

02-09-2006, 09:53 AM	#2
EricS76 Registered User Join Date: May 2004 Location: Llano,TX Posts: 113	Re: C30 U-bolts vs. C20 U-bolts How about just what is the width of a C-20 spring? 2.5 or 3 inches? __________________ ‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71…

02-10-2006, 12:34 PM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: C30 U-bolts vs. C20 U-bolts My 86 C20 3/4 leafsprings are 2.5 inches wide. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

02-10-2006, 01:28 PM	#4
EricS76 Registered User Join Date: May 2004 Location: Llano,TX Posts: 113	Re: C30 U-bolts vs. C20 U-bolts Thanks for the info. __________________ ‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71…

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