80 GMC K20 Hydroboost? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cobinder · 04-20-2007, 01:41 PM

I'm wanting to convert my truck to hydroboost. Will my stock 80 pump work? Steering box? I've converted it to disc's in the rear so I know I need a new master cylinder setup. Was thinking I'd go to the boneyard and get the mc/hydroboost combo, but wasn't sure if I needed the pump and box also.

Thinking I'm gonna do a hydralic clutch while I'm at it

any input would be very helpful.

cobinder · 04-21-2007, 09:48 PM

anybody?

jeffspower · 04-21-2007, 09:56 PM

No box difference. You can use your pump, but it will need an additional return port. Don't just put in a tee, drill a hole and weld in another port. It would be easier just to use the donor pump if it is correct for your brackets.

ND_guy · 04-22-2007, 04:42 PM

I used the pump off of the donor van because it has about twice the fluid capacity. The hydroboost has metric fittings and my steering box was standard thread so i had to change the pressure line from booster to half metric and standard. Overall it was an easy swap, and braking performance increased dramatically.

cobinder · 04-22-2007, 07:18 PM

Thanks a lot guys for the info. I'm off to the bone next weekend.

Ivan D. · 04-26-2007, 03:05 AM

I put hydroboost in my C10, but since I used an '80s diesel truck as a donor I ran into problems with the pressure lines - the ports in my steering box and pump required flared lines, while the donor lines were push-in and o-ring style. Cut the lines, flared, good to go. I used the stock nuts, but the donor ones would work too. Only thing is now my damn hydroboost is leaking around teh pedal rod upon release of brake pedal, are these units serviceable?

bigtruck81 · 04-26-2007, 04:12 PM

Quote:

Originally Posted by ND_guy

The hydroboost has metric fittings and my steering box was standard thread so i had to change the pressure line from booster to half metric and standard.

with either a 15/16" or 1" wrench, you couldve swapped the pressure line fitting in the back of the pump and saved the hassle.

ND_guy · 05-03-2007, 12:04 AM

Quote:

Originally Posted by bigtruck81

with either a 15/16" or 1" wrench, you couldve swapped the pressure line fitting in the back of the pump and saved the hassle.

I should have been clearer in my original post. The fittings from the PUMP to the Hydroboost were fine, and I was able to use the factory hose.

The Hose I had to change was from the Hydroboost to the steering box.

The Hydroboost is metric and my steering box is standard flare. I could have gone with a newer metric psbox and wouldn't have had to modify anything, but my psbox is tight so I decided to keep it and just modify the hose.

Nick

cobinder · 05-03-2007, 10:55 AM

What year and model trucks would I look for to pirate this system and a hyd. clutch from?

cobinder · 05-05-2007, 05:40 PM

Anybody?

jeffspower · 05-05-2007, 08:06 PM

I think the hyd. clutch on a full size started in '86. Not sure on the hydraboost- maybe around '77. You can find it on HD 3/4 tons & 1 tons. All diesel Chevys & GMC's have it. Even diesel Blazers.

04-20-2007, 01:41 PM	#1
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	80 GMC K20 Hydroboost? I'm wanting to convert my truck to hydroboost. Will my stock 80 pump work? Steering box? I've converted it to disc's in the rear so I know I need a new master cylinder setup. Was thinking I'd go to the boneyard and get the mc/hydroboost combo, but wasn't sure if I needed the pump and box also. Thinking I'm gonna do a hydralic clutch while I'm at it any input would be very helpful. __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome

04-21-2007, 09:48 PM	#2
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	Re: 80 GMC K20 Hydroboost? anybody? __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome

04-21-2007, 09:56 PM	#3
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: 80 GMC K20 Hydroboost? No box difference. You can use your pump, but it will need an additional return port. Don't just put in a tee, drill a hole and weld in another port. It would be easier just to use the donor pump if it is correct for your brackets. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

04-22-2007, 04:42 PM	#4
ND_guy Tool Addiction=Money Shortage Join Date: Mar 2006 Location: Grand Forks, ND Posts: 233	Re: 80 GMC K20 Hydroboost? I used the pump off of the donor van because it has about twice the fluid capacity. The hydroboost has metric fittings and my steering box was standard thread so i had to change the pressure line from booster to half metric and standard. Overall it was an easy swap, and braking performance increased dramatically. __________________ 1967 K20 400TBI SM465/NP205 posi front, Detroit locker 4.56 rear

04-22-2007, 07:18 PM	#5
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	Re: 80 GMC K20 Hydroboost? Thanks a lot guys for the info. I'm off to the bone next weekend. __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome Last edited by cobinder; 04-22-2007 at 07:18 PM.

04-26-2007, 03:05 AM	#6
Ivan D. glamoros piece o' lowlife Join Date: Mar 2007 Location: Redford, MI Posts: 1,164	Re: 80 GMC K20 Hydroboost? I put hydroboost in my C10, but since I used an '80s diesel truck as a donor I ran into problems with the pressure lines - the ports in my steering box and pump required flared lines, while the donor lines were push-in and o-ring style. Cut the lines, flared, good to go. I used the stock nuts, but the donor ones would work too. Only thing is now my damn hydroboost is leaking around teh pedal rod upon release of brake pedal, are these units serviceable? __________________ The more I drink, the more I drink, the more I drink... diesel, reg cab, long bed, 4 across the rear, single stack, wooden stakes, and lotsa lights - the Hay Express

05-03-2007, 10:55 AM	#9
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	Re: 80 GMC K20 Hydroboost? What year and model trucks would I look for to pirate this system and a hyd. clutch from? __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome

05-05-2007, 05:40 PM	#10
cobinder Everything is work in progress Join Date: Apr 2006 Location: Denver Colorado Posts: 326	Re: 80 GMC K20 Hydroboost? Anybody? __________________ Good luck with your truck! How much?! It's just an old truck part!! 49 International on a 80 GMC 3/4ton 4x4 chassis 48 International KB-5 2 ton dump bed 04 Honda CRF "500" 09 Honda CRF450 fuel injected rocket 03 Suzuki hayabusa carbonfiber wheeled monster. 02 Ford diesel stretch van (toy hauler) 01 38' Monaco diesel pusher motorhome

05-05-2007, 08:06 PM	#11
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: 80 GMC K20 Hydroboost? I think the hyd. clutch on a full size started in '86. Not sure on the hydraboost- maybe around '77. You can find it on HD 3/4 tons & 1 tons. All diesel Chevys & GMC's have it. Even diesel Blazers. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car



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