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Username Post: 1986 Chevy G van windshield
GLHS60
Newbie
Posts 8
06-09-21 11:58 AM - Post#2821413    

Does anyone know if a 1986 G 20 windshield can be installed with urethane only?

I decided to replace the windshield on my old van that was urethyned in, no rubber.

It was a terrible mess and now the glass shop says it needs a rubber gasket.

Its just a junker van I use for dump runs so I'm not looking for perfection.

Should have left it alone !!

Thanks
Randy
gchemist
Member #271 Senior Chevytalk Moderator
Posts 25538
gchemist
06-09-21 06:26 PM - Post#2821423    

Our generation of vehicles all had rubber as far as I know. I've never seen one with urethane. Later generations did have urethane. Check with www.jcwhitney.com for windshield rubber. They have generic strip rubber that should be close to original.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

1983G20Van
Super Senior Member
Posts 3894
06-09-21 08:36 PM - Post#2821424    

I have both an 83 and an 87 G20 that both had urethane only from GM. BOTH leaked. Glass guy uses the rubber gasketed style as a replacement. So far neither have leaked. I think the switch to urethane was around the 1980 model year on Vans.
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals

GLHS60
Newbie
Posts 8
06-10-21 10:43 AM - Post#2821444    

I appreciate the reply's guys.

Not sure what this was originally as it was very poorly "glued" in.

I had a glass and rubber from a 1976 van that I attempted to install.

With the 1986 glass out and busted I realized it's a no go.

Then I had hole in my 1986 with nothing to fill it up.

I couldn't find a 1986 van rubber online but many for 1971-80.

Then I visited a local a glass shop looking for info.

Sometimes I forget how old I am, glass shop guys were all born after 1986.

I don't think they ever worked on a 1986 van before.

They brought in a 1986 van windshield and set it in place.

It seemed to fit OK so they urethaned it in place.

Its probably supposed to have a reveal molding if no rubber gasket but it'll do.

Now I'm watching out for older chevy vans to see how they're done.

I sure caused myself a lot of grief and $$ trying to use the 1976 glass!!

Thanks
Randy





gchemist
Member #271 Senior Chevytalk Moderator
Posts 25538
gchemist
06-12-21 07:28 AM - Post#2821521    

Wow, I didn't know GM started using urethane so early. Please post information you find.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

GLHS60
Newbie
Posts 8
06-12-21 08:13 PM - Post#2821544    

I came across this butyl vs urethane thread, very long but informative.

Doesn't pertain Chevy vans specifically but GM vehicles in general.

I always thought the older G.M's used butyl tape prior to using urethane.

After the rubber gaskets of the 1950's they used an early form urethane in the 1960-70's.

Thanks
Randy



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