So when in 1972 did GM start installing single wall tops? - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**too much stuff** · 08-04-2019, 03:20 PM

Pete, I will add to the thread and let you work your detective skills with the info from my blazers/jimmys.

Blazer 1, single wall top with a speaker grill on top of the dash.
Blazer 2 single wall with no speaker on top of dash.

**too much stuff** · 08-04-2019, 03:25 PM

Wish I could be of more help, but this is what I have.

Jimmy 1, single wall top, no speaker.
Jimmy 2 double wall, no speaker.

**too much stuff** · 08-04-2019, 03:32 PM

This will either help or just add to the confusion...

Jimmy 3, single wall, no speaker on top.
pic 3 is a jimmy I parted with a single wall top.
pic 4 is a body in storage and looks to have a double wall top, but not sure if it is original to it. (can't open the drivers door at the moment either.)

**DeadheadNM** · 08-04-2019, 08:37 PM

Eric thanks for posting. I’ll comb through these. I need to jog my memory regarding sequence numbers for GMCs - for some reason I seem to recall the sequence numbers differed and weren’t inline with Chevy but I may be mistaken.

**Gyrine** · 08-10-2019, 12:51 AM

My Blazer was built in Flint, sequence number 178459, has May dates in under the dash pad and on the NP205. Speaker is located in the dash.

**DeadheadNM** · 08-11-2019, 10:13 PM

Thanks for posting. I ran into a guy with a 2wd Flint build 72 had an original single wall (that he swapped for a double wall) no speaker grill in the dash. Sequence was 126xxx

**DeadheadNM** · 09-08-2019, 10:57 PM

Here’s another Flint built single wall without pickup style speaker grill atop dash so originally had a speaker beneath the dash. December 1971 build.

Thanks Eric.

1mrtimk · 11-05-2019, 07:12 PM

1972 St Louis built 168756!
Speaker under dash and black double wall top when I bought it!
Owned since 1980 with no reason to believe it was not original.
Replaced it with a single wall many years ago.

**MJN** · 11-08-2019, 03:01 PM

I'll dig up some old photos before selling it- was a '72 St. Louis built with double wall top. Actually Mudduck74 bought it but I haven't seen it since.

**DeadheadNM** · 11-12-2019, 08:41 AM

Quote:

Originally Posted by A1971Blazer

One must bear in mind that the assembly of vehicles was much different back in '72 than it is today..
'72 marked the end of the body style for the trucks and the Blazers....
perhaps in an effort to use up the current inventory of parts.....some Blazers got truck dashes with the speaker grill in them and some did not....
maybe the same with the tops...they didn't want to be stuck with a warehouse full of unused tops....
simply due to availability....with no rhyme or reason? IDK....just guessing...?

There’s definitely a pattern and it’s documented on this thread. Flint switched from double to single walls and the early single walls used the non-pickup, external to the dash speaker whereas later run single wall tops used the pickup style speaker. Makes sense to switch to the pickup style in terms of stock but St Louis doesn’t appear to have followed suit and there’s no definite evidence of St Louis using single wall tops.

What I’d like to know is when St Louis stopped making the 72 Blazer relative to Flint. Flint assembled them until at least May of 72 and probably later. I’m not sure about St Louis.

69-72 · 11-12-2019, 07:41 PM

72 2wd GMC built in Flint on March 14th 1972 Single wall no speaker
72 4wd Chev built in Flint May 1972 Single wall yes speaker

**DeadheadNM** · 11-13-2019, 08:43 AM

All 72 K5s had provisions for both top styles

69-72 · 11-13-2019, 07:41 PM

Quote:

Originally Posted by DeadheadNM

All 72 K5s had provisions for both top styles

Id have to check my Blazer but my 72 Jimmy definitely only had holes for a single wall

**DeadheadNM** · 11-14-2019, 09:44 PM

Quote:

Originally Posted by 69-72

Id have to check my Blazer but my 72 Jimmy definitely only had holes for a single wall

Post pics up if poss. Would be great to see top and bottom shots. Thanks.

The LH rear quarter on my Blazer was replaced with a GM replacement that was not pulled from another K5. It was new but GM. It has provisions for both tops.

FarmTruckGarage · 11-17-2019, 10:32 PM

I have a 72 I just bought a couple months ago from Las Vegas. I live in MI. It only has holes for a single wall top. Fortunately I was able to scrape the paint off my door sticker. No speaker hole in dash but looks like theres a mount for one.

Sorry spid is upside down... not sure why it flipped

**DeadheadNM** · 11-17-2019, 11:00 PM

Thanks so much for posting. Interesting twist of information. Would love to see more examples. No sign then that the double wall holes were filled in?

FarmTruckGarage · 11-18-2019, 07:56 AM

Quote:

Originally Posted by DeadheadNM

Thanks so much for posting. Interesting twist of information. Would love to see more examples. No sign then that the double wall holes were filled in?

No signs at all. As far as I can tell the quarters are original. Unfortunately I don’t have a single wall for it right now. I have 2 doubles.

mister.freeze · 11-18-2019, 03:39 PM

my '72 (St. Louis) has both sets of holes and a double wall. the single-wall holes are 'sorta' filled in.

1mrtimk · 11-18-2019, 08:46 PM

Quote:

Originally Posted by 1mrtimk

1972 St Louis built 168756!
Speaker under dash and black double wall top when I bought it!
Owned since 1980 with no reason to believe it was not original.
Replaced it with a single wall many years ago.

Also, single and double wall holes!

mister.freeze · 11-19-2019, 10:46 AM

Quote:

Originally Posted by 1mrtimk

1972 St Louis built 168756!
Speaker under dash and black double wall top when I bought it!
Owned since 1980 with no reason to believe it was not original.
Replaced it with a single wall many years ago.

Mine is 165182, so yours is later than mine. Maybe more serial numbers will pin down a better date?

Hagendog · 11-25-2019, 01:37 AM

72 with single wall top

**DeadheadNM** · 11-25-2019, 10:16 PM

Thanks for posting.

**DeadheadNM** · 12-01-2019, 03:57 PM

Here’s a photo from 1rippen76 that shows the difference between CST and non-CST single wall top to bedside strips. There are two styles each with LH and RH specificity.

Hagendog · 12-01-2019, 07:28 PM

Are the ones on the left the CST? Those are the ones I have

**DeadheadNM** · 12-01-2019, 10:27 PM

Quote:

Originally Posted by Hagendog

Are the ones on the left the CST? Those are the ones I have

Correct. These clear the chrome trim that secures the top of the rear panels.

08-04-2019, 03:20 PM	#51
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,773	Re: So when in 1972 did GM start installing single wall tops? Pete, I will add to the thread and let you work your detective skills with the info from my blazers/jimmys. Blazer 1, single wall top with a speaker grill on top of the dash. Blazer 2 single wall with no speaker on top of dash. Attached Images __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-04-2019, 03:25 PM	#52
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,773	Re: So when in 1972 did GM start installing single wall tops? Wish I could be of more help, but this is what I have. Jimmy 1, single wall top, no speaker. Jimmy 2 double wall, no speaker. Attached Images __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-04-2019, 03:32 PM	#53
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,773	Re: So when in 1972 did GM start installing single wall tops? This will either help or just add to the confusion... Jimmy 3, single wall, no speaker on top. pic 3 is a jimmy I parted with a single wall top. pic 4 is a body in storage and looks to have a double wall top, but not sure if it is original to it. (can't open the drivers door at the moment either.) Attached Images __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

08-04-2019, 08:37 PM	#54
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? Eric thanks for posting. I’ll comb through these. I need to jog my memory regarding sequence numbers for GMCs - for some reason I seem to recall the sequence numbers differed and weren’t inline with Chevy but I may be mistaken. __________________ 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

08-10-2019, 12:51 AM	#55
Gyrine Active Member Join Date: Jun 2015 Location: Huntsville, AL Posts: 195	Re: So when in 1972 did GM start installing single wall tops? My Blazer was built in Flint, sequence number 178459, has May dates in under the dash pad and on the NP205. Speaker is located in the dash.

08-11-2019, 10:13 PM	#56
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? Thanks for posting. I ran into a guy with a 2wd Flint build 72 had an original single wall (that he swapped for a double wall) no speaker grill in the dash. Sequence was 126xxx __________________ 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

09-08-2019, 10:57 PM	#57
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? Here’s another Flint built single wall without pickup style speaker grill atop dash so originally had a speaker beneath the dash. December 1971 build. Thanks Eric. 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

11-05-2019, 07:12 PM	#58
1mrtimk Registered User Join Date: Dec 2011 Location: labadie mo Posts: 48	Re: So when in 1972 did GM start installing single wall tops? 1972 St Louis built 168756! Speaker under dash and black double wall top when I bought it! Owned since 1980 with no reason to believe it was not original. Replaced it with a single wall many years ago.

11-08-2019, 03:01 PM	#59
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,046	Re: So when in 1972 did GM start installing single wall tops? I'll dig up some old photos before selling it- was a '72 St. Louis built with double wall top. Actually Mudduck74 bought it but I haven't seen it since. __________________ '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

11-12-2019, 07:41 PM	#61
69-72 Registered User Join Date: May 2008 Location: 204 Posts: 903	Re: So when in 1972 did GM start installing single wall tops? 72 2wd GMC built in Flint on March 14th 1972 Single wall no speaker 72 4wd Chev built in Flint May 1972 Single wall yes speaker __________________ 1969 Chevy Custom Camper 3/4 ton Rust free survivor 1972 Chevy Blazer CST 4x4 Almost Rust free survivor 1972 GMC Jimmy 2wd Undergoing surgery

11-13-2019, 08:43 AM	#62
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? All 72 K5s had provisions for both top styles __________________ 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

11-17-2019, 10:32 PM	#65
FarmTruckGarage Registered User Join Date: Jun 2018 Location: Grand Rapids, Michigan Posts: 2	Re: So when in 1972 did GM start installing single wall tops? I have a 72 I just bought a couple months ago from Las Vegas. I live in MI. It only has holes for a single wall top. Fortunately I was able to scrape the paint off my door sticker. No speaker hole in dash but looks like theres a mount for one. Sorry spid is upside down... not sure why it flipped Attached Images Last edited by FarmTruckGarage; 11-17-2019 at 10:58 PM.

11-17-2019, 11:00 PM	#66
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? Thanks so much for posting. Interesting twist of information. Would love to see more examples. No sign then that the double wall holes were filled in? __________________ 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

11-18-2019, 03:39 PM	#68
mister.freeze Registered User Join Date: Dec 2003 Location: Houston, TX Posts: 733	Re: So when in 1972 did GM start installing single wall tops? my '72 (St. Louis) has both sets of holes and a double wall. the single-wall holes are 'sorta' filled in. __________________ '72 K5, known as 'the Fox.'

11-25-2019, 01:37 AM	#71
Hagendog Registered User Join Date: Nov 2018 Location: Oakdale, CA Posts: 28	Re: So when in 1972 did GM start installing single wall tops? 72 with single wall top Attached Images



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11-25-2019, 10:16 PM	#72
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? Thanks for posting. __________________ 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

12-01-2019, 03:57 PM	#73
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,428	Re: So when in 1972 did GM start installing single wall tops? Here’s a photo from 1rippen76 that shows the difference between CST and non-CST single wall top to bedside strips. There are two styles each with LH and RH specificity. 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

12-01-2019, 07:28 PM	#74
Hagendog Registered User Join Date: Nov 2018 Location: Oakdale, CA Posts: 28	Re: So when in 1972 did GM start installing single wall tops? Are the ones on the left the CST? Those are the ones I have

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