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#1 |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
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Hydroboost into a 67-72
I did some research on this a while back, and it seemed like every thread I found talked about drilling holes in the firewall or other modifications that made this swap difficult to do.
In looking at donor trucks, it seems like only the metric (1980+) trucks had the type of booster I'm working with here. Anyways, some pictures: Comparison between an unmodified '87 hydroboost bracket and my '72 power brake booster ![]() Lining up the center holes puts the pushrod in the center of the hole in the firewall. I should note that the hydroboost had two pressed-in studs in the center holes, which I popped out. ![]() Using two snug fitting bolts and a welding clamp, I carefully lined up the two holes and marked for the other holes I needed. It's tough to see here, but there was a stamped bend in the top of the hydroboost, which I pounded flat prior to marking (just below the top holes) ![]() After drilling three new holes and some cutting and grinding, this is what I came up with. The cut on the bottom right was to allow me to bend the bracket out slightly to clear the flange around the steering column on the firewall. Bracket dry fit on my '72 cab ![]() And here's the donor hydroboost bolted in place ![]() ![]() I had to make zero modifications to the firewall, except pulling out the original rubber linkage boot. The photo doesn't show, but mounted like this the hydroboost pushrod is about 5/8" too short (and offers no adjustment). Unfortunately it's a smaller diameter than the adjuster end on the 67-72 style pushrod, so either I will cut and thread the rod and thread a piece of tubing to make an adjuster of my own, or I'll modify the pedal to move the pivot closer to the firewall.
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CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) Last edited by JJorgensen52; 08-17-2015 at 12:41 PM. |
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#2 |
Registered User
![]() Join Date: Oct 2013
Location: Elkton
Posts: 693
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Re: Hydroboost into a 67-72
Cool thanks for the post i have the booster and am doing this to my 68 !
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#3 |
Registered User
![]() Join Date: Oct 2012
Location: Newhall CA
Posts: 1,195
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Re: Hydroboost into a 67-72
looks good
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69 SWB 780hp Hellcat powered, manual 6 speed, currie 9 |
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#4 |
Registered User
Join Date: Oct 2006
Location: Dundee, Oregon
Posts: 311
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Re: Hydroboost into a 67-72
Very nice, thanks for sharing.
How is the pressure and return line plumbing going? Are you using all the stock lines the the 80+ truck? Are they flare or O-ring lines? What are you doing to get two return lines into your reservoir housing? |
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#5 | |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
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Re: Hydroboost into a 67-72
Quote:
![]() This is happening at the same time as my 2wd to 4wd 1 ton swap, so I probably won't get to finalizing the plumbing for a week or so and I will update this thread when I do. More info on the swap here
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CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#6 |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
|
Re: Hydroboost into a 67-72
Had a few spare hours this afternoon - modified my brake pedal to work with the pushrod for the hydroboost. That way, if the hydroboost ever has to be replaced, it's a bolt-on.
![]() I've put it all together, it works, I've painted the pedal and I will get some pictures once it's dried and I can put it back for good.
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CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#7 |
Registered User
![]() Join Date: Oct 2013
Location: Elkton
Posts: 693
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Re: Hydroboost into a 67-72
Great this will make my swap easy!
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#8 |
Divorced .....WITH KIDS
Join Date: Dec 2003
Location: mississippi
Posts: 619
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Re: Hydroboost into a 67-72
I'm new to the power brake / hydra boost swap . What's the difference between them ?
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1969 GMC SWB 1975 Chevy Malibu 80k 1963 Ford Galaxie 63k (inherited) 2005 Nissan Armada (wife's idea) |
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#9 | |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
|
Re: Hydroboost into a 67-72
Quote:
The functional difference for us is that the 67-72 came with power brakes, you can just bolt it on, where hydroboost was first available around '74 or '75, that I know of. So, basically to make a hydroboost work you need new power steering lines, a modified mounting bracket for the firewall, and either a modified push-rod or a modified pedal (as I did in this case)
__________________
CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#10 | |
Divorced .....WITH KIDS
Join Date: Dec 2003
Location: mississippi
Posts: 619
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Re: Hydroboost into a 67-72
Quote:
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1969 GMC SWB 1975 Chevy Malibu 80k 1963 Ford Galaxie 63k (inherited) 2005 Nissan Armada (wife's idea) |
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#11 |
1 thing at a time is progress.
Join Date: Jun 2007
Location: Ball Ground GA
Posts: 5,511
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Re: Hydroboost into a 67-72
Subscribed
__________________
Alan
Philippians 2:14-16 |
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#12 |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
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Re: Hydroboost into a 67-72
I don't have any photos yet, but status update:
With the modified pedal, the hydroboost unit fits nicely and is installed for the final time. The '87 truck brake lines actually fit in the '72 almost like they were meant to go there I was able to successfully swap the pressure outlet fitting in my PS pump to the later metric unit, and the '87 pressure line fits nicely (they're a tad longer than needed but it is nice to have the extra for neat routing). I had to make a couple small tweaks to the line shape, but it was nearly a bolt on affair.
__________________
CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#13 |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
|
Re: Hydroboost into a 67-72
Well I am WAY behind on my photo updates, but I finally got a chance to get some photos of how this turned out:
First, overall engine bay shots ![]() ![]() These are regular issue 1987 V30 hydroboost lines (Eldelman power steering lines and Inline Tube stainless brake lines) ![]() Detail shots of hoses. I chose to use the '87 steering box on my '72 frame to make the plumbing easier ![]() I also retained the original '72 power steering pump, which required a tee in the return lines ![]() Just a few notes. 1. I did have to tweak the PS lines, and also the inner fender, a bit at the steering box to make everything fit but it all clears and no cutting was required. 2. The original PS pump has a smaller reservoir than the newer style pumps; initially I thought this was an unsolvable issue because I was getting aeration when turning and using the brakes at the same time. However, after some road time and bleeding the system out I've eliminated that and am happy to report no problems. 3. I read a bunch here and elsewhere about not using a "T" in the return line as it would starve the pump. After doing some research, the first years of GM hydroboost trucks (up until about 1980) were designed with a "T" in the system. Provided you use a tee of the appropriate ID, this is NOT a problem at all. Overall, could not be happier with the swap. Very consistent, solid pedal feel across all different engine and truck loading conditions, and it is so very much cleaner under the hood.
__________________
CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#14 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Hydroboost into a 67-72
Subscribed also. This is a conversion I'll do eventually. I love the hydroboost in my diesel DD's
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#15 |
Registered User
![]() Join Date: Jun 2014
Location: Shingle Springs, CA
Posts: 869
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Re: Hydroboost into a 67-72
Good job on the swap. It really cleans up the firewall.
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#16 |
Registered User
Join Date: Jul 2011
Location: El Campo, Tx
Posts: 1,246
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Re: Hydroboost into a 67-72
Very nice
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72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!! |
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#17 |
Keepin an eye out
Join Date: Feb 2003
Location: So.Cal
Posts: 3,921
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Re: Hydroboost into a 67-72
Have HB on my truck the previous owner installed...One thing I can say is if I ever need to hit the brakes hard im sure I will be going through the windshield.
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1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351 |
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#18 |
Registered User
![]() Join Date: Oct 2013
Location: Elkton
Posts: 693
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Re: Hydroboost into a 67-72
Awesome so a stock power steering pump works with a t on the return!I am going serpentine belt so i will use a pump from the same year i take the set up off of 1996 most likely.
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#19 |
Registered User
Join Date: May 2011
Location: Syracuse, Utah
Posts: 1,928
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Re: Hydroboost into a 67-72
Great job as usual, subscribed!
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Brett ![]() 67 Camaro SS Build:http://67-72chevytrucks.com/vboard/s...d.php?t=751594 72 Cheyenne/10 Super 115" Fleetside (Waiting it's turn.) 72 Cheyenne/K30 Super 133" DRW SOLD Build:http://67-72chevytrucks.com/vboard/s...d.php?t=645614 YouTube: https://www.youtube.com/@6dee7-7dee2 |
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#20 |
Senior Member
![]() Join Date: Feb 2012
Location: chillicothe, illinois
Posts: 688
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Re: Hydroboost into a 67-72
where did you mount the prop valve?
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#21 |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
|
Re: Hydroboost into a 67-72
Since I was using the square body lines, I mounted it on the front cross member just like they do. I used the square body cross member for the sway bar mounts, but the same position will work on a 67-72 cross member no problem
![]() ![]() I happened to have a second '67 truck harness laying around, and the harness - prop valve wire is made in two pieces with a connector where it leaves the main harness. By pulling that piece off my spare harness, I was able to plug into the extension already on the '72 and reach the prop valve on the cross member no problem.
__________________
CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#22 |
Registered User
Join Date: Nov 2013
Location: Oxnard,ca
Posts: 98
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Re: Hydroboost into a 67-72
Quote:
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#23 |
Registered User
Join Date: Feb 2016
Location: Elizabeth City, NC
Posts: 1
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Re: Hydroboost into a 67-72
Quote:
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#24 | |
Simple? What's simple?
![]() Join Date: Apr 2007
Location: Southeast CT
Posts: 1,472
|
Re: Hydroboost into a 67-72
Quote:
LINK
__________________
CURRENT '50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build '63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos '66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos '69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!) '72 Sierra Grande 2WD LWB fleetside 350-TH350 Refresh '99 K2500 Silverado RCLB 5.7 Vortec - NV4500/NP241C (Daily) '99 K2500 Suburban 7.4 Vortec - NV4500/NP246 (still working out the bugs) SOLD '71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder) |
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#25 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Hydroboost into a 67-72
Hydroboost would have come from a 1 ton truck
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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