73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Body, Glass & Paint => Topic started by: ehjorten on November 20, 2017, 12:54:21 PM
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So I recently replaced the taillamps on my '77 K20. I got the taillamps as an assembly with the housing, lens and gasket that goes between the housing and lens, but did not get the gasket that goes on the back of the housing that goes between the bed-sides and the housing!
I can't seem to find these! Does any parts house offer these?
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That's because there isn't one
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I beg to differ Vile! My stock 1977 K20 lamp housings had gaskets adhered to the back of the lamp housings!
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(https://uploads.tapatalk-cdn.com/20171120/803f9fa4d802e228d3cc3a5b901bf1e5.jpg)
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Blazer;
Any part numbers for reference on that gasket?
EDIT...think I found the parts catalog page:
(http://www.gmpartswiki.com/getbigpage?pageid=60641)
Thanks,
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Have you checked the site store first. Might come in a gasket kit also.
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Gm likes to change numbers, a newer model might show an updated #.
Hard to say if there available from Gm but reproductions are out there.
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Where can I get them?
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http://www.jegs.com/p/SoffSeal/SoffSeal-Tail-Light-Marker-Light-Seals-Gaskets/1434010/10002/-1?N=0&Ntk=productgroup&productId=1434010&Tab=SKU&make=4294829741&model=4294829307&productId=1434010&year=4294829802&productId=1434010
Just one I found with a quick search.
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Email or call the site store first
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The depiction posted above is for the gasket that goes between the lamp lens and the lamp housing even though the image is out of order. Do you have pics ? I've never seen a factory body gasket, not even sure what purpose it would serve if there were one or how it would seal anything. The closest thing I've ever seen to a gasket on the body side is a foam seal on the back of the vertical reflector and only on some of them. I have a surplus of 73-87 factory lights in my garage and none of them have a body gasket, only the lamp lens to housing gasket.
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Vile;
I saved the factory housing and lens that wasn't broken. I will take picture of the gasket on the back of the housing. It is glued on to the back of the housing. I tried to separate it and reuse, but found it was glued pretty good and didn't try that hard. My rear taillamp harness was the problem with my left turn signal and brake lamp malfunctions. I replaced that and put in new taillamp sets and it never worked better!
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Vile;
I saved the factory housing and lens that wasn't broken. I will take picture of the gasket on the back of the housing. It is glued on to the back of the housing. I tried to separate it and reuse, but found it was glued pretty good and didn't try that hard. My rear taillamp harness was the problem with my left turn signal and brake lamp malfunctions. I replaced that and put in new taillamp sets and it never worked better!
Did you take pics?
Sent using Tapatalk
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The gasket is a closed-cell foam that appears to be about 3/8" in width and at least 1/8" thick, though likely a little more before compression set.
It was tack-glued on in the 4 corners of the housing. The replacement Depot lamp housings have the raised perimeter on the back of the housing that the gasket fits around.
(https://lh3.googleusercontent.com/fLvx38oELnEvTVKSIb7MrkO_av2yBWh__533k3MJr9bg7TwRlnAJdZOnxoy16BKluSHCkBAZr8OV969QWtQWodFm_9mWnU9dNvLr3JP2NLhz2AG2L28Z7YLwy-gnF8UclRBZ5XQ2srNAKE0N3vAXX-zvJZvGnvFHKDEv6lnYWLjH1OWosXfKDnHB6qpRhS8I6BdvOIULw4xQVRiOBRpApv5dFYQ_NFpCKyhst3b9bp0w-9fH3mIvs29Zr_gsu_5LInT3v4TxOUGoYzafDXPTPRmyC5V_SZo6VG5y1oBFN4RlpoiCDjvSMoFdxvrpFIAucqFYPqPXL2SuZGTHtzspmWmg6OLNN1FI2iv3tNWuLLEL0H_9pYAMD_Q_naWhRkUEv0z5wLw_QI2cxIUDJoUFGor3w9sZLPCAKR_AmieQ-mYed0ulem9u5RXojYba8TdugdIGFP7XNcPshC6OusD76s8X_VnahY4XHz45xaoVBWAI6gJt-Qi1PN3yt2Qc2N0noV3jIc8bb1ATxZ6VM7_7PfhAvXZJbjrqVE0kF1ElPIgKmy6c4h7rhFZsTelQqI--8qLhAN2mKJBAMZbF9ba9cSXLLh8ahH9XyJt64lGcdQ=w638-h1134-no)
(https://lh3.googleusercontent.com/rEjCIP5b6433qkFqL4GW6XacKkWTGi_Zvllvo0csPVcZ49O4aAxjkNaTMt62XoMJ5KgeEeR791zvxF9Fo0wAxVd2gioVCwqnQHlG_VzAjAmapqrtePQi6Qs2hO4pd_68V0zCKoOv8AkowAnic6_VTy1WT2iWVNRDR5uFgF4o3IDb5g_HamYYYM5hivSihPGtkGmPqTWCWHT2McObaFwUpVp_N0Fo8x6B_0ld7odeJEmGN3OLUZRUFPX05mlK6jBWduCZ41v2CN28n2P4CMiQxRC8PoyDPVQFd6oNCNnFbUW8cDSgf437Nu0fk4je5VmaRRMu-dcG2Hee0EttaRsWJMK_mFQvsHAmZem9RJ0ohTYE9UgzzsdXbSPlN7lCS7pfkbLjGZVANPpHo1mWc_USc3RrBZkL7c0GUn00w6fVYy5Q93SZaTDYk6-BEInJHNCAimzpiFrwFXoIOeIsKwX77cGXPjH1SsRO9gpV44Bz5H18fuMWgn1o6ExTrxA8yDNHUVG_yEDAZaWDDxPf-iUQkvyBW2YORdIsXfZa60ZwhDEgbvZx4V5WASSIeKf8dNXQAiRMQtF3lRvNDaegpyeXA9VUavrHn3zt4coMWqexaw=w638-h1134-no)
(https://lh3.googleusercontent.com/9pha3taTF6bgwVOTBdietv92TWOMgZyqWK5hG3VGisRKwDa_SC51QZ-SCwUq7w42S0bTySAJv6jpnAq381hUWTbTPpPd9a6D5CGvTj2V4A4IM0QTl9y3qFYWtQ32krMaF4nf6it8byYJTDle2eRJi0Wn1EE1aIaL1w-WqQ7iVgihT10Gsg_7PwKgJTF5sE0d9AuK-e0cvwX1P3aRxnzerpYFWwYtqCKDjLJGWxYJux6tzkzN99yK9swlFKL8xMtTMq3IVzBqCNc1SbVCzwVKpj8nMz5I2dAk_CvYHEeVSdf6sKxyR-O0_XtVVXnIuyY7bv0TGQ2Ho9HIx1OfBvUfs4K9GQPrSuyHDuA-e_Vh005JoQ01yc29KT42I3qwUgW7yk7Whchvnfu-1b5DRxsruQdJ2zhdzrvNQyVj2w1QRGJ77NQUCYebMq8rmZrGueArRjtHOS4gMEtAk4mYIQu-tSoxbLtHy9vvJoyLcIXvogS6udGj6GTq3id7E9svxF-2CR4g7aD0m6t-BjXqjH8urz6NwUy_7kbWoztOFfOh9ICze9ih2_T5jqZo06G6W4tBbBKhFdoijvC32SztP5e-1L_WqBoTfms4Hl_bdu06gA=w1560-h878-no)
(https://lh3.googleusercontent.com/-G3EFPRfvE5aWZx0ACP_gKjJLj2oOvaeL77_POkHg83Jl2w0-Tp7o93Jrb-wz7nQHugfDCLAOQJibUrY32j5Kjdyo-M5J8k5Cdh0zH4h_kEXoE-W-lwKScwiBlOPCugBUCh39O-U1RGBgOtiIVTnY9Hpnfqk9GmrZL3rhxpfol9Rez55hpcBHQn9VdJGPDY570jjANRfxZjDAyWmlwqLgIOwAWyQK7C5Bxf8982EwNIva01jyGrDN742PXhFTCnqS57XQE5P0vVTVN13UyQfPF7hIoFGkmP2YQsO-UTIkwruB4nBrVG6hRFDhxxPYAub6a-vU0U-n9Z8lLdXdo_pAw1_ZnWf-4VvUFQYR_YSMhlvnAL1MYMrjMGELzk1NIvocR0DlTaz2fRAkKNSgcAskaQ7tVZsM0ye_sXF6uJgHR4RsIvDnqIhWuVsXmgKXf_eI1xIznFeb0bPfZQq2JznCezj-nKu78awRwCS7e8ad4douFvxtCcU-ZG3Y56igIrzg4jrfJiBTqa9RDr2WmvwSjpnrT6UOcVjbQSATh3OYH7DZwpgN2TIx-evQtFKAVTxn2vp5g3vYTT5amuqGH8NsNMR6k7Vtn05DofJo08g2w=w1560-h878-no)
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Hi EH:
You know, that outside gasket sure looks like a professionally made gasket that is supposed to go on the rear lamp assembly. I would guess that it is OEM as the parts book show. The lens to housing gasket is not shown because it is automatically included when you buy the housing and not considered a separate part. Why does the front lamp have a separate part number for the lens to housing gasket?...good question.
You know, when I first painted my 76 C-20 25 years ago, I recall there also being this external gasket when I disassembled everything...but mine is gone now as I have bought replacement assemblies without the gasket, and as Vile has mentioned it all fits OK. Maybe the factory supplied this gasket to make the rear lens assy fit better to the body as it fits around a curve...I think it is possible to crack the assembly if you tighten it too much on this curve of the bodywork or scratch the paint on the curve of the body. The front lens assy is flat and so there is not a tolerance issue on fit to the body. Over time, the aftermarket guys just leave off the gasket because it only solves a tolerance issue that rarely comes up and makes the product cheaper. That's my guess on the situation.
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I just went out and looked at every set I have in stock which spans the years of 73-88. None of them have the gasket so I looked at my 91 Suburban because it clicked that I remembered there being something different about those ones that caught my eye and sure enough there is a gasket there. So I am not sure if there is a rhyme or reason as to why some do and some don't other than what Henry suggested but I will look more carefully in the daylight at them.
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Here’s another of both.(https://uploads.tapatalk-cdn.com/20171129/46d6ef90d1babbc4fe61d90cbd62dd89.jpg)
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Good find. I like when I learn new things about these trucks
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Gmpartswiki is your friend.
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ive seen it too on one of my trucks but dont remember which one. but i know it hasnt been on all of them, just thinking but maybe it has something to do with acting like a spacer due to the chrome trim ring? im sure only one truck that i seen has it and i think i only have one truck with the chrome trim
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Hi All:
GM parts catalog for 73-78 has this:
Gasket, tail lamp lens, parts group 2.684, part number 5965748 (for 73-78 fleetside CK-1,2,3, blazer and Jimmy), quantity 2 per vehicle...this is obviously to seal the lens to lamp housing
Gasket-Retainer, tail lamp, parts group 2.660, part number 329813 (for 73-78 fleetside CK-1,2, suburban), quantity 2 per vehicle...lamp housing to vehicle
Gasket-Retainer, tail lamp, parts group 2.660, part number 466716 R.H., 466715 L.H. (for 75-78 fleetside CK-1,2, suburban), quantity 1 each per vehicle...lamp housing to vehicle
It seems there was a design change around 1975 and the parts books before the 1980s are somewhat confusing on this issue. The parts description of "Gasket-Retainer" implies the gasket and retaining hardware for the lamp assembly were a single part, but I have never seen a retainer other than the little discreet sheet metal spring clips that attach to the body. For suburbans, Blazer, and vans, this gasket may serve a purpose to stop moisture from entering the interior of the vehicle, but for the pick-ups, my best guess is that it is to solve a tolerance problem associated with the attachment.
Regards,
Henry
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My '77 Truck is a Silverado and as such had the chrome trim around the lens. So...maybe it was applied to trucks with the trim ring? I would think it would help to keep muck and grime out of the back of the housing and off of the electrical connection points.
I will have to check the taillamps on my '91 Crew Cab, but I know that truck was repainted before I owned it, and it is a Cheyenne. Taillamps may have been replaced.
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here is the 6270058 retainer
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0ahUKEwiYrN-SxOnXAhXEY98KHewnDCkQFgguMAE&url=http%3A%2F%2Fwww.ebay.com%2Fitm%2FAC-Delco-1979-91-Chevy-Suburban-GM-NOS-Rear-Tail-Lamp-Retainer-Bracket-RH-%2F121877273351%3Fhash%3Ditem1c60739b07%3Ag%3AJPgAAOSwzhVWqOE5%26vxp%3Dmtr&usg=AOvVaw1xmI9WxWu7fgayWX6rzj7B
(http://forum.73-87chevytrucks.com/smforum/index.php?action=dlattach;topic=35892.0;attach=38062;image)
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just an idea that maybe its for blazers and burbs to help keep exhaust fumes from creeping up through the tail light housing
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The gaskets are readily available if you do a search, just like the side marker lights. I would imagine that there is a couple reasons to have the gaskets. One is to keep from the vibration from rubbing the paint off and the other is the less water you are letting leak into the body panels from the top the better off you are. That is purely speculation though. I had an 86 GMC back when it was fairly new and it had the tail light gaskets.
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From my knowledge, it was generally upper trim level trucks only. I don't know that it is reproduced.
The link prior is the lens gasket or so it appears. I can check though, just give me the part number in an email... If it is out there, I can get it.
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On my second picture the body gasket refers to 06 which is the suburban code.
Sure there’s more but would have to dissect the manual.
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I did a google search and found the proper gasket.
Sent from my iPhone using Tapatalk
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Can't you just cut your own? Or seal it with silicone? Am I missing something obvious here?
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Hi Dr Snooz:
Absolutely...you can buy some closed cell foam from an industrial supplier like McMaster-Carr and make your own. I think there is a lot of discussion on this just trying to understand what the OEM design(s) and part number(s) should be.
Regards,
Henry