Having problems with windshield upgrade to 964 style.

[palle7688]

I have 964 windshield and seal in my '76.
The seal is more flush or flat as in no trim sticking out in the wind.
Sorry not able to take pics at the moment.
I had minor leak in lower outer corners that I fixed with RTV, I know, I know it will be PITA to remove.
Actually I have also have 964 targa rear window with 3rd brake light and 964 seal and IIRC something had to be cut in the seal to fit.

[Tom '74 911]

Originally posted by Porsche Doc
Hey Milt,
My 2 cents!
I have tried to put a 964 windshield and seal in early car with NO success. The glass and seal are bigger than the earlier ones.
I have also tried to put a earlier windsield in a 964 too with no luck.
Good luck Man!

Don -
When you say "early car" do you mean pre '74 or just earlier than a 964?
Thanks,
Tom

[Porsche Doc]

Originally posted by Tom '74 911
Don -
When you say "early car" do you mean pre '74 or just earlier than a 964?
Thanks,
Tom

I am referring to the 65-89 911's windshields. Their all the same size.
When the 964 came out the windshield was made bigger as well as the opening in the body.

We have been installing Porsche windshields now for over 20 years.
We have done a pile of them!
So... I don't know HOW the guys that said that installed a 964 windshield got them in.
PLEASE educate ME.
By the eye a Carrera windshield looks just like a 964 one.

[island911]

So then are you thinking people are using 911 glass w/ 964 rubber?

[Porsche Doc]

Originally posted by island911
So then are you thinking people are using 911 glass w/ 964 rubber?

We have never had any luck with using the 964 rubber ether with an early glass. It's just to big.
I guess if you wanted to make a few extra cuts in it to make it smaller?
I am only going by our experiences.

We tried to but a early windshield in this C2 race car and it was to small.


We tried to install a 964 seal in this 89 930 with no luck as well.

[palle7688]

So... I don't know HOW the guys that said that installed a 964 windshield got them in.

I'm not sure, IIRC we used a string to pull in the seal.
It's be sitting there for years now.
Here's an pic from 2005, it's what I could find, you should be able to see both front and rear window are 964 seals without trim.

[Porsche Doc]

Originally posted by palle7688
I'm not sure, IIRC we used a string to pull in the seal.

Thanks! But I know ya use a string.
We have tried to do rear coupe windows as well and couldn't get to work.
We haven't tried to to do it to a Targa like in your pic.

I am gona get out my factory body manuals and post them for you guys when I get a chance.

[doug petty]

I personally tried to put 964 windsheild in an 85 cab & the seal only covers the metal flange by about a 1/8" & wouldn't stay in.
Broke the first one, so had a tech come over with a new on & he had the same problem, fought it for an hour. The origin 85 went in in about 15 min. by myself.

[philipguziec]

My 89 930 glass has an antenna in it. Does that mean it is 964 glass?

[CBRacerX]

Originally posted by philipguziec
My 89 930 glass has an antenna in it. Does that mean it is 964 glass?

Nope, many 911's have the attenna glass.

[philipguziec]

The glass is coming out of the car for paint anyway, it has the antenna in the glass and it has some milkiness along the base, which isn't a big deal for me. What can I do to clean up the aerodynamics at the top of the windshield? It sounds like the reason to change glass is just to get a different flush seal. Can I fit one of those seals with my existing windshield? I'd be willing to change the windshield to get the flush seal.

I'm getting mixed messages from this thread. What is the story regarding the extra seal to put the later windshield in and get it to seal? Could you give me some more detail?

Thanks.

[Formerly Steve Wilkinson]

The bottom line seems to be that putting stock 911 glass into a stock 964 seal and then trying to install it in a stock 911 simply won't work.

However in my case, I am putting Lexan into a 964 seal and then installing it into a 1983 911. I can therefore cut (trim) the Lexan to any size I wish, and can therefore fit it into a 964 seal. No need for me to go into the details of how I'm going to measure and trim the Lexan, but the finished Lexan piece will be slightly larger than the 911 glass that it is replacing.

the reason you're getting mixed messages is that some of us are talking about a hand-crafted modification such as the one I've described in the second paragraph, others are talking about attempting the procedure described in paragraph one above.

[philipguziec]

Thanks Steve. One more question, will putting a 964 seal and 964 glass in an 89 911 work?

[island911]

Originally posted by philipguziec
Thanks Steve. One more question, will putting a 964 seal and 964 glass in an 89 911 work?

Geeze you are a lazy reader.

[philipguziec]

"Here's an pic from 2005, it's what I could find, you should be able to see both front and rear window are 964 seals without trim."

vs.


" Formerly Steve Wilkinson - That's odd, Steve Weiner does it all the time.

In response to:

rdane quote:
--------------------------------------------------------------------------------
Originally posted by Porsche Doc
I have tried to put a 964 windshield and seal in early car with NO success. The glass and seal are bigger than the earlier ones.
I have also tried to put a earlier windsield in a 964 too with no luck.
--------------------------------------------------------------------------------
"

Not lazy, just trying to nail down who has and who has not done what.

[Formerly Steve Wilkinson]

Yeah, my post about Steve Weiner was lazy too. What I neglected to specify was that he does it with custom-trimmed Lexan, not stock glass.

[randywebb]

"just trying to nail down who has and who has not done what."

- Yes, and please specify what seal you used when you post. That might be a critical issue.

For those interested in the 964 glass b/c of its antenna, I started a new thread on that.
Antenna in Windshield vs. Under Dash

[philipguziec]

Thanks for helping out. Unless there is a way to enlarge the opening (that's gotta be nuts), I guess I'm stuck with the stock seal on my street car.

Just so aerodynamically... offensive, even if it's 1 mph and 1 db.

[rdane]

Couple of things to add to the glass thread. My take is Pre '74 wind shields are smaller and the seal smaller with trim than latter windows.

Porsche part numbers I am told show different part numbers for '78- '89 than pre '74. Check the Porsche numbers first.

The 964 glass and seal is slightly bigger. Not every seal is the same even in same production years and part numbers. The shop I am currently working with has added 964 glass and seals to a number of earlier cars (read pre '76). But it doesn't work with every car every time. The SC Series seems to be a problem.

My '79 won't take a later windshield and 964 seal so there is obviously some variation between cars and years. We are, as I type this, now trying an earlier windshield and a 964 seal. I'll let you know how that goes shortly. The 964 windshield and the seal with trim wasn't the right answer wither IMO. Radio antenna will have to go inside the dash if this set up works..

Plexiglass windshields are the easiest way to make it happen but you can also use a glass grinder to accomplish the same effect.

From my take on it, using my car as an example, the 964 seal conversion is not for the faint of heart or one light in the pocket book.

[Porsche Doc]

Originally posted by philipguziec
Thanks Steve. One more question, will putting a 964 seal and 964 glass in an 89 911 work?

NO!