77 C30 to 86 K5 parts swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JIMs70GMC** · 02-14-2016, 12:45 PM

My local CL has a 77 C30 manual tranny wrecker with hydro boost brakes, I was wondering if the 77 steering column, pedal assembly and hydro boost assembly would work in my K5? I would also snag the 2wd steering gear box for future crossover steering. Thanks,

Jim

**old Rusty C10** · 02-14-2016, 02:42 PM

the column is different after 1984 so that wont work you would need to find one from a newer truck

nonstop · 02-14-2016, 03:13 PM

Your K5 uses metric steering line fittings, the C30 uses flared fittings. The pedal assembly should work...

**hatzie** · 02-14-2016, 03:44 PM

The pedals, Hydro-Boost, and Power steering pump are a set don't separate them. Vacuum boost brake pedal push rod pins are slightly different. Your 1986 pump will be missing the hydroboost return hose nipple and it has an O-Ring pressure hose fitting.

Keep all the power steering hoses including the SAE flare return fitting on the C30 steering box.

The C30 steering gear box is swap stuff. Someone will want it but you won't for this project. 2WD boxes are not the same as 4WD steering boxes.

You will need to get a few things...
The flare fitting pressure hose from the SAE Hydroboost is setup for a 70's SAE flare fitting steering box. It will not mate with your 80's O-Ring fitting steering box.
The easy way to take care of this is to use a pre 1980 SAE flare fitting Steering box off a K series truck with your pressure hoses and have done with it...
or...
You can make a hybrid Booster to Steering box pressure hose. Take your 70's hydroboost-to-steering box pressure hose and an 80's O-Ring Hydroboost-to-steering box pressure hose to a hydraulic hose shop. Have them make you a hybrid pressure hose with your 70's hydroboost to 80's O ring steering box fittings... Tell them to use SAE J2050 Power Steering Pressure hose.
You may be able to get it done at NAPA but any hydraulic hose outfit should be able to do the job for you.

The steering return hoses are just low pressure SAE J189 hose slipped over the hose fittings with Rotor Clip® type Constant Tension Spring Band Clamps for retention. Gates, Goodyear, Continental, etc make this hose and NAPA, Car Quest, etc. carry it or can get it. You can even buy it on Amazon. The clamps are the same deal. Don't use Worm Clamps on these hoses. They'll leak.

**JIMs70GMC** · 02-17-2016, 08:10 AM

so leave the steering column. take the hydroboost, power steering pump, pedal assembly and gear box (for crossover). and it should all work?

**hatzie** · 02-17-2016, 01:06 PM

That's what I'd do.

If the 77 is a manual transmission column maybe you can find a buyer.

The 73-83 columns don't have the dimmer or wiper controls.
84 has wipers and dimmer on the column but there are differences from 84 to 85.
If you want completely drop-in replacement on 85 and newer you should stick with 85 and newer columns.

There are other differences, year-to-year, in 73-83 columns but none of them matter to you.

02-14-2016, 12:45 PM	#1
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	77 C30 to 86 K5 parts swap My local CL has a 77 C30 manual tranny wrecker with hydro boost brakes, I was wondering if the 77 steering column, pedal assembly and hydro boost assembly would work in my K5? I would also snag the 2wd steering gear box for future crossover steering. Thanks, Jim __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-14-2016, 02:42 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,276	Re: 77 C30 to 86 K5 parts swap the column is different after 1984 so that wont work you would need to find one from a newer truck __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

02-14-2016, 03:13 PM	#3
nonstop Registered User Join Date: Dec 2014 Location: Northern California Posts: 422	Re: 77 C30 to 86 K5 parts swap Your K5 uses metric steering line fittings, the C30 uses flared fittings. The pedal assembly should work...

02-14-2016, 03:44 PM	#4
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,920	Re: 77 C30 to 86 K5 parts swap The pedals, Hydro-Boost, and Power steering pump are a set don't separate them. Vacuum boost brake pedal push rod pins are slightly different. Your 1986 pump will be missing the hydroboost return hose nipple and it has an O-Ring pressure hose fitting. Keep all the power steering hoses including the SAE flare return fitting on the C30 steering box. The C30 steering gear box is swap stuff. Someone will want it but you won't for this project. 2WD boxes are not the same as 4WD steering boxes. You will need to get a few things... The flare fitting pressure hose from the SAE Hydroboost is setup for a 70's SAE flare fitting steering box. It will not mate with your 80's O-Ring fitting steering box. The easy way to take care of this is to use a pre 1980 SAE flare fitting Steering box off a K series truck with your pressure hoses and have done with it... or... You can make a hybrid Booster to Steering box pressure hose. Take your 70's hydroboost-to-steering box pressure hose and an 80's O-Ring Hydroboost-to-steering box pressure hose to a hydraulic hose shop. Have them make you a hybrid pressure hose with your 70's hydroboost to 80's O ring steering box fittings... Tell them to use SAE J2050 Power Steering Pressure hose. You may be able to get it done at NAPA but any hydraulic hose outfit should be able to do the job for you. The steering return hoses are just low pressure SAE J189 hose slipped over the hose fittings with Rotor Clip® type Constant Tension Spring Band Clamps for retention. Gates, Goodyear, Continental, etc make this hose and NAPA, Car Quest, etc. carry it or can get it. You can even buy it on Amazon. The clamps are the same deal. Don't use Worm Clamps on these hoses. They'll leak. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 02-14-2016 at 07:33 PM.

02-17-2016, 08:10 AM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	Re: 77 C30 to 86 K5 parts swap so leave the steering column. take the hydroboost, power steering pump, pedal assembly and gear box (for crossover). and it should all work? __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

02-17-2016, 01:06 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,920	Re: 77 C30 to 86 K5 parts swap That's what I'd do. If the 77 is a manual transmission column maybe you can find a buyer. The 73-83 columns don't have the dimmer or wiper controls. 84 has wipers and dimmer on the column but there are differences from 84 to 85. If you want completely drop-in replacement on 85 and newer you should stick with 85 and newer columns. There are other differences, year-to-year, in 73-83 columns but none of them matter to you. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 02-17-2016 at 01:43 PM.



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