Mack B63SX Posted December 19, 2008 Share Posted December 19, 2008 (edited) Hey everyone, I'm new to the forum, so I'll give you some background. I have been in the process of restoring my grandfathers B63 SX self loader log truck for almost a year now. It had been in the family since the 60's and was on the verge of going to the scrap yard! So I bought the truck and have been in love with B models ever since! Pretty unusual for a 23 year old kid huh? Anyway I have gone thru the main and browny on the mack now and am almost ready to put the cab back on, two parts trucks later. Now for my first of many stupid question, many more to follow I'm sure. The B63 had a 20 speed quad, my B75 parts truck had an 18 speed quad. So I ended up using the main from the 18 speed and the browny from the 20 speed. What do I have now? 18 or 20. Where does the difference lie? More importantly will this work? Any help will be greatly appreciated! Edited December 19, 2008 by Mack B63SX Quote Link to comment Share on other sites More sharing options...
Packer Posted December 19, 2008 Share Posted December 19, 2008 I don't think you've changed a thing.The differance is that in a 20 speed, you would split 5th gear. (5-low, 5-Direct, 5-hi)In the 18 speed, you shift from 4-hi to 5-hi.5th is overdrive only.Packer Quote Keep a clutchin' Link to comment Share on other sites More sharing options...
theakerstwo Posted December 19, 2008 Share Posted December 19, 2008 Get the model # off of both and post because there is more than one 1820 speed trans. I may still remenber some of this but will have to look at some books. Some have a over drive in the front box and some dont. There is two different doubble over drive trans. glenn Quote glenn akers Link to comment Share on other sites More sharing options...
Mack B63SX Posted December 21, 2008 Author Share Posted December 21, 2008 Will get some numbers and post back. Thanks guys. Quote Link to comment Share on other sites More sharing options...
HK Trucking Posted December 21, 2008 Share Posted December 21, 2008 Also, when you put the older type main box against a newer compound, there is a slight difference in the compound countershaft drive gear, you may not notice it when assembling, but when you take the truck down the road, the mismatched gears will sound like a siren!Been there, done that, although it was a long time ago. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment Share on other sites More sharing options...
theakerstwo Posted December 21, 2008 Share Posted December 21, 2008 Also, when you put the older type main box against a newer compound, there is a slight difference in the compound countershaft drive gear, you may not notice it when assembling, but when you take the truck down the road, the mismatched gears will sound like a siren!Been there, done that, although it was a long time ago. A baby siren. My son has done that here with a Quad. I watched him and it looked the same. but remenber years ago the there was two series of gears . I think that is going to have to be looked up on the parts book using that 11QK##### Quote glenn akers Link to comment Share on other sites More sharing options...
Mack B63SX Posted December 24, 2008 Author Share Posted December 24, 2008 Well I made it back! You guys know as well as I do how hard it is to get anything done at Christmas time. Anyway, the main transmission that I intend to use is Part # 284KB-584-B, Casting # 284KBK-582-B. The brownie is part # 281KB531. This main is an 18 speed, the brownie is from the 20 Speed.The 20 Speed main is Part # 284KB-584-B. The 18 speed brownie is part # 281KB53. These two units both have some bad bearings in them. So I thought I would use the others which are in good shape. Thanks Quote Link to comment Share on other sites More sharing options...
Mack B63SX Posted March 28, 2009 Author Share Posted March 28, 2009 Thought I would drag this one back out and see if anyone had an answer! Thanks Quote Link to comment Share on other sites More sharing options...
Red Horse Posted March 31, 2009 Share Posted March 31, 2009 Thought I would drag this one back out and see if anyone had an answer! ThanksEver try sending those numbers to Don Schumaker at Mack Museum? Quote Link to comment Share on other sites More sharing options...
Mack B63SX Posted April 1, 2009 Author Share Posted April 1, 2009 I hadn't given that much thought, but that may just work! Anyone have his address handy? I think I have it somewhere but may have lost it. Thanks! Quote Link to comment Share on other sites More sharing options...
Red Horse Posted April 1, 2009 Share Posted April 1, 2009 I hadn't given that much thought, but that may just work! Anyone have his address handy? I think I have it somewhere but may have lost it. Thanks!mack.museum@macktrucks.com Quote Link to comment Share on other sites More sharing options...
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