Mikesbucketlistmack Posted December 24, 2013 Share Posted December 24, 2013 Hello fellow Mackaholics !I would like to replace the factory single round air horn on my truck (1981 R) with a square horn. I've never done this before and would like some advice on how to do it. Do I have to take off the interior roof panels ? Or what will I find when I unscrew the original horn from the roof, etc. ? Thank you ! Quote Link to comment Share on other sites More sharing options...
Superdog Posted December 24, 2013 Share Posted December 24, 2013 Keep what you have. The new square front horns start peeling and rust out,the old round chrome plated brass ones last a lifetime 1 Quote Link to comment Share on other sites More sharing options...
39 Baby Mack Posted December 24, 2013 Share Posted December 24, 2013 Mike's right, too many square horns these days.For that matter there are too many LED lights these days, Thomas Edison must be spinning in his grave!Ron 1 Quote Link to comment Share on other sites More sharing options...
maxidyne237 Posted December 24, 2013 Share Posted December 24, 2013 Buy a Grover rebuild kit and leave it alone. You can rebuild on the roof. You are going to have to drop the headliner if you want to change it out Quote Link to comment Share on other sites More sharing options...
alex g Posted December 24, 2013 Share Posted December 24, 2013 I agree about round horns but I replaced mine and I did have to drop the headliner.You will have to plumb airlines to go dual horns it's not a big deal.I also found that the length is different on the mounting brackets from round to square so you will have to do some drilling on your roof. Quote Link to comment Share on other sites More sharing options...
Red Horse Posted December 24, 2013 Share Posted December 24, 2013 Keep what you have. The new square front horns start peeling and rust out,the old round chrome plated brass ones last a lifetimeTo say nothing of the fact that if you put a square horn on it, you will have to start wearing a flat brim baseball hat that is two sizes two big so it covers the top of your ears and start driving with air out of your seat so you can barely see over the dash! Actually could be worse-you could be asking about a quad locomotive horn! Quote Link to comment Share on other sites More sharing options...
RFCDrum Posted December 24, 2013 Share Posted December 24, 2013 I changed my round hron to a new round Grover stutter tone fire truck horn. My horn had all the chrome wearing off of her and wasn't working. Quote Link to comment Share on other sites More sharing options...
farmer52 Posted December 24, 2013 Share Posted December 24, 2013 Just purchased two (2) Grover air horns for my MH. It currently has one (1) round Grover that is checked and pitted. I will have to drill holes for the second horn. According to the parts book, the horn is attached with bolts, not screws. Going to use stainless hardware. I will need to remove the headliner. Plan to install a Tee at the valve and run dual air lines (one to each horn), Do the air lines need to be the same length?I changed my round hron to a new round Grover stutter tone fire truck horn. My horn had all the chrome wearing off of her and wasn't working. I thought about buying Stuttertone horns but opted for the original. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
RFCDrum Posted December 24, 2013 Share Posted December 24, 2013 The size was the same so it just bolted right up. I like the sound. Quote Link to comment Share on other sites More sharing options...
maxidyne237 Posted December 24, 2013 Share Posted December 24, 2013 Yes equal legth from the valve Quote Link to comment Share on other sites More sharing options...
leversole Posted December 25, 2013 Share Posted December 25, 2013 If you make one of the lines shorter, you can "play" the horns the way the old railroaders used to! Quote Link to comment Share on other sites More sharing options...
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