Gmc 1977 mirror id help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

frenchy51 · 04-08-2022, 10:36 AM

I just purchased a 1977 GMC 15 "HeavyHalf" I want to get rid of the ugly add-on mirrors and go back to stock. All I have to go by is the original mounting area shown in the pictures. None of the sport mirrors that I can find mount up to my existing plate. My 2 bolt mounting area is 2 3/4" center to center of holes Do any of you have an idea what mirror would work (and if they are available)? I'm sure the 2 existing threaded holes are original to the truck. Thanks!

Warrens69GMC · 04-08-2022, 12:08 PM

Congrats on having a Big10. I'm no help on the mirrors as I have towing mirrors.

Here's mine.

Dead Parrot · 04-08-2022, 02:31 PM

This is off my 75 when I swapped out for a set of Dumbo mirrors. (Had a boat at the time and wanted mirrors with better trailer vision.)

The black rusty piece mounts inside the door. May be a screw for the oval shaped hole, not sure.
The black plastic piece mounts on the outside and is keyed by a projection that fits into the 3rd hole in your pic #2.
The bare metal piece is held in place with two screws through the door(the 2.75 inch apart holes) and screw into the black metal piece(sheet metal type screws, no nuts.) May have been hex head.
The mirror is held in place with a single screw that goes into the rear and then into the bare metal piece.

IIRC - my screws were damaged/twisted to destruction during mirror removal. They weren't in the zip lock bag with the rest of the parts.

No clue about current availability of all the parts. Hanging on to mine in case I decide to revert to original configuration at some point.

Memzd · 04-10-2022, 07:18 PM

This is what you looking for
https://www.cjponyparts.com/cj-class...3-1987/p/MI27/
Posted via Mobile Device

trucktony · 07-30-2022, 10:19 PM

Hello frenchy51
Funny but I have been looking for mirrors that fit the plastic mount that I have on my Doors.
Also a 77 c20 3/4 ton
Could you tell me the brand and type that you have on your truck as in the first picture.
I would like to buy a set so I do not have to put more holes in my Doors for a set of west coast OR any other aftermarket mirrors.
Thanks

frenchy51 · 07-31-2022, 06:31 PM

PM sent-Tony

04-08-2022, 10:36 AM	#1
frenchy51 Registered User Join Date: Jun 2014 Location: Orland, Nor-Cal Posts: 617	Gmc 1977 mirror id help I just purchased a 1977 GMC 15 "HeavyHalf" I want to get rid of the ugly add-on mirrors and go back to stock. All I have to go by is the original mounting area shown in the pictures. None of the sport mirrors that I can find mount up to my existing plate. My 2 bolt mounting area is 2 3/4" center to center of holes Do any of you have an idea what mirror would work (and if they are available)? I'm sure the 2 existing threaded holes are original to the truck. Thanks! Attached Images __________________ 1972 Highlander PAC B 400BB-SOLD 1974 K5 Blazer-6.0 swap 1974 C20 Long Bed 454 1977 GMC HeavyHalf several adopted orphans

04-08-2022, 02:31 PM	#3
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,472	Re: Gmc 1977 mirror id help This is off my 75 when I swapped out for a set of Dumbo mirrors. (Had a boat at the time and wanted mirrors with better trailer vision.) The black rusty piece mounts inside the door. May be a screw for the oval shaped hole, not sure. The black plastic piece mounts on the outside and is keyed by a projection that fits into the 3rd hole in your pic #2. The bare metal piece is held in place with two screws through the door(the 2.75 inch apart holes) and screw into the black metal piece(sheet metal type screws, no nuts.) May have been hex head. The mirror is held in place with a single screw that goes into the rear and then into the bare metal piece. IIRC - my screws were damaged/twisted to destruction during mirror removal. They weren't in the zip lock bag with the rest of the parts. No clue about current availability of all the parts. Hanging on to mine in case I decide to revert to original configuration at some point. Attached Images

04-10-2022, 07:18 PM	#4
Memzd Registered User Join Date: Jan 2018 Location: Saudi arabia - Riyadh Posts: 19	Re: Gmc 1977 mirror id help This is what you looking for https://www.cjponyparts.com/cj-class...3-1987/p/MI27/ Posted via Mobile Device

07-30-2022, 10:19 PM	#5
trucktony Registered User Join Date: Oct 2009 Location: Los Angeles California Posts: 24	Re: Gmc 1977 mirror id help Hello frenchy51 Funny but I have been looking for mirrors that fit the plastic mount that I have on my Doors. Also a 77 c20 3/4 ton Could you tell me the brand and type that you have on your truck as in the first picture. I would like to buy a set so I do not have to put more holes in my Doors for a set of west coast OR any other aftermarket mirrors. Thanks Attached Images

07-31-2022, 06:31 PM	#6
frenchy51 Registered User Join Date: Jun 2014 Location: Orland, Nor-Cal Posts: 617	Re: Gmc 1977 mirror id help PM sent-Tony __________________ 1972 Highlander PAC B 400BB-SOLD 1974 K5 Blazer-6.0 swap 1974 C20 Long Bed 454 1977 GMC HeavyHalf several adopted orphans

04-08-2022, 12:08 PM	#2
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,613	Re: Gmc 1977 mirror id help Congrats on having a Big10. I'm no help on the mirrors as I have towing mirrors. Here's mine. Attached Images



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