Old truck windows getting too stiff......

[sixdogs]

Be careful with silicone since it's migration and fumes can screw up a future paint job.
Highland416 is probably right.

 

[Boeing]

Window regulators have a life span and these may have exceeded it! Pivot points wear, the teeth on the sector get worn, rollers get loose, etc. At some point no amount of cleaning and greasing will make them work like new. At the very least, remove the regulators and clean the old, fossilized, dried up grease/dust crud out of everything and re-grease with white grease. Make sure everything is adjusted right, also.

Pop the door panel off and see what you have and go from there.

Guys, I thank you. I don't think those regulators are real expensive so I think I'll order new ones. The tracks have felt but it is half gone and petrified, ought to replace those too. And the adjustment.....don't know?? The rear post/frame of the door is cut off to make this model a "convertible" so there is no rear window track. It wasn't this bad 20 years ago......duh. Thanks, again


I just ordered two new regulators....$41 each from this company:


(I went to LMC first but they only had units for Suburban's....?)https://www.americanclassic.com/ American Classic Truck Parts for Chevrolet & GMC Trucks[/urlhttps://www.americanclassic.com/ American Classic Truck Parts for Chevrolet & GMC Trucks[/url

 

[chim]

.........................The rear post/frame of the door is cut off to make this model a "convertible"...................................

Unless someone put the wrong doors on it, you don't have a '75. Until (and including) 1975 models, the entire top came off from the windshield back and the doors had frameless windows.

 

[Mace Canute]

Unless someone put the wrong doors on it, you don't have a '75. Until (and including) 1975 models, the entire top came off from the windshield back and the doors had frameless windows.

Years ago I saw a guy driving one of those. It was a nice sunny day earlier so i suspect he took the top off for a nice drive but when I saw him it was absolutely pouring rain! He didn't look happy...

My old 1994 truck gets Rust Checked every year so my window regulators and door latches/locks always work like new.

 

[ultrarunner]

My standby is graphite in the felt channels...

 

[Boeing]

Unless someone put the wrong doors on it, you don't have a '75. Until (and including) 1975 models, the entire top came off from the windshield back and the doors had frameless windows.

You're right, the orig doors were so badly rusted out midway and bottom that I ordered "replacement" doors from LMC. The aftermarket doors that I received were full frame pickup type doors. When I called them they said that the orig doors were "not available" After 42 years guess it's hard to stock parts. The truck IS a '75 as it had the full fiberglass top and roll bar on it, the VIN/equipment label state '75 also. :thumbsup:.

 

[deanocraft]

Good job on a nice truck. I think you need some giant tires to make it complete! Just my opinion...

 

[chim]

................After 42 years guess it's hard to stock parts......................

Holy cow! You're making me feel old. I ordered a new 1975 K5 Blazer new and it seems it wasn't all that long ago. I think I paid $5,900 for it back then. About 3 years after I bought it I bought a top that was crunched in the back and cut it off behind the roll bar. Put a rear window in it and had a tarp made for the remaining bed. It looked like the shortest Chevy pickup you could imagine.

 

[The Fred]

Honda recommends a product called Shin Etsu for this specific purpose. I have used it for 15 years on most European car window tracks it works very well.

Amazon.com: Genuine Honda 8798-913 Silicone Grease: Automotive

 

[chim]

............Shin Etsu..................

Gesundheit