Correct Wheel Cylinder for a 72 K20 w/ a H052?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Graham57a** · 10-20-2021, 07:55 PM

Very specific question here but has anyone replaced the wheel cylinders in an H052 and have a good part number handy? I’ve ordered from 3 places now and they are all wrong. The picture below is the original cylinder compared to what rock auto sent me. I also tried the parts house and they couldn’t even order something for me. Truck is currently out of commission until I get this fixed so some help would be greatly appreciated!

burnin oil · 10-20-2021, 08:50 PM

Measure the bore size of the cylinders. If they are the same size, you shouldd be good to go other than tweaking the brake line for the different angle. The parts stores stock a single casting for multiple applications. The dually cylinders cover about 40 years and multiple axles and brands and I bet the SRW are the same. If you are stuck on originality get a rebuild kit and hone the wheel cylinders out.

**Stocker** · 10-20-2021, 09:39 PM

Got these from Napa back in 2012 -- the numbers are still on the site so should still be good. We put these on my '72 K20 with HO52.

Right rear #UP37039
Left rear #UP37040

cangim · 10-20-2021, 09:56 PM

Through autozone and some coaching on how to search we found these for my HO72.

**DeadheadNM** · 10-20-2021, 10:04 PM

You have examples for a coil not leaf spring rear. Here are examples of what I believe are correct.

**Graham57a** · 10-20-2021, 10:40 PM

Thanks guys! I ordered the ones from napa, they should be here Monday. Fingers crossed! I really appreciate the quick input

**Graham57a** · 10-20-2021, 10:42 PM

Quote:

Originally Posted by DeadheadNM

You have examples for a coil not leaf spring rear. Here are examples of what I believe are correct.

I thought that might be the case but the examples I kept finding looked correct when shown for coil springs and the three that I actually ordered were tagged for leaf springs. This is a pic of what rock auto says is correct for coils and it looks like what I need.

**DeadheadNM** · 10-20-2021, 11:03 PM

You bet. Keep us posted and if you can confirm any other part numbers like drums etc you might make use of please share.

**special-K** · 10-21-2021, 07:03 AM

Coil spring have angled line/bleeder and leaf spring are straight

**DeadheadNM** · 10-21-2021, 10:16 AM

Quote:

Originally Posted by special-K

Coil spring have angled line/bleeder and leaf spring are straight

The one pulled from the leaf spring rear of his k20 and posted above is angled though.

**chevmn** · 10-21-2021, 10:27 AM

If you have not purchased rear shoes........

https://67-72chevytrucks.com/vboard/...d.php?t=822013

**MJN** · 02-03-2022, 10:51 AM

Not sure if you found the wheel cylinders you were looking for but The Filling Station has these that look like they match your original.

**Graham57a** · 02-03-2022, 12:47 PM

Quote:

Originally Posted by MJN

Not sure if you found the wheel cylinders you were looking for but The Filling Station has these that look like they match your original.

Yes I did, the unit from Napa ended up being correct. Thanks for following up

10-20-2021, 07:55 PM	#1
Graham57a Senior Member Join Date: Aug 2010 Location: Asheville, North Carolina Posts: 1,866	Correct Wheel Cylinder for a 72 K20 w/ a H052?? Very specific question here but has anyone replaced the wheel cylinders in an H052 and have a good part number handy? I’ve ordered from 3 places now and they are all wrong. The picture below is the original cylinder compared to what rock auto sent me. I also tried the parts house and they couldn’t even order something for me. Truck is currently out of commission until I get this fixed so some help would be greatly appreciated! Attached Images __________________ ANDREW 1972 Chevy SWB Cheyenne Super JANE http://67-72chevytrucks.com/vboard/s...d.php?t=462072 1972 GMC Jimmy PENNY http://67-72chevytrucks.com/vboard/s...d.php?t=735827 1968 GMC patina swb PEARL http://67-72chevytrucks.com/vboard/s...d.php?t=731315 1972 Chevy K20 BRUCE http://67-72chevytrucks.com/vboard/s...d.php?t=805788

10-20-2021, 08:50 PM	#2
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? Measure the bore size of the cylinders. If they are the same size, you shouldd be good to go other than tweaking the brake line for the different angle. The parts stores stock a single casting for multiple applications. The dually cylinders cover about 40 years and multiple axles and brands and I bet the SRW are the same. If you are stuck on originality get a rebuild kit and hone the wheel cylinders out.

10-20-2021, 09:39 PM	#3
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,731	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? Got these from Napa back in 2012 -- the numbers are still on the site so should still be good. We put these on my '72 K20 with HO52. Right rear #UP37039 Left rear #UP37040 __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

10-20-2021, 09:56 PM	#4
cangim Registered User Join Date: Jan 2020 Location: Meridian, ID Posts: 28	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? Through autozone and some coaching on how to search we found these for my HO72. Attached Images __________________ 1972 C30 2WD 157” WB

10-20-2021, 10:04 PM	#5
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,451	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? You have examples for a coil not leaf spring rear. Here are examples of what I believe are correct. Attached Images __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland

10-20-2021, 10:40 PM	#6
Graham57a Senior Member Join Date: Aug 2010 Location: Asheville, North Carolina Posts: 1,866	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? Thanks guys! I ordered the ones from napa, they should be here Monday. Fingers crossed! I really appreciate the quick input __________________ ANDREW 1972 Chevy SWB Cheyenne Super JANE http://67-72chevytrucks.com/vboard/s...d.php?t=462072 1972 GMC Jimmy PENNY http://67-72chevytrucks.com/vboard/s...d.php?t=735827 1968 GMC patina swb PEARL http://67-72chevytrucks.com/vboard/s...d.php?t=731315 1972 Chevy K20 BRUCE http://67-72chevytrucks.com/vboard/s...d.php?t=805788

10-20-2021, 11:03 PM	#8
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,451	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? You bet. Keep us posted and if you can confirm any other part numbers like drums etc you might make use of please share. __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland

10-21-2021, 07:03 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? Coil spring have angled line/bleeder and leaf spring are straight __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

10-21-2021, 10:27 AM	#11
chevmn Senior Member Join Date: Dec 2017 Location: Central MO Posts: 900	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? If you have not purchased rear shoes........ https://67-72chevytrucks.com/vboard/...d.php?t=822013

02-03-2022, 10:51 AM	#12
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	Re: Correct Wheel Cylinder for a 72 K20 w/ a H052?? Not sure if you found the wheel cylinders you were looking for but The Filling Station has these that look like they match your original. Attached Images __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com



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