MACKTRUCKS4 Posted March 29, 2013 Share Posted March 29, 2013 I got my antique plate for my B-model yesterday so I could at least drive my truck once in a while when I get a spare minute or two (LOL). Only cost $133.00.Anyway, now the problem I have is the one I'm driving is a 422 that was converted over to a diesel with a two stick 9 spd. The rears were never changed, so the ratio is 7.00. Needless too say, the truck tops out at 45 mph. I have a quad box to put in or should I look into changing the rears? What ratio would work best if I leave the 9 spd. in? Truck has 10.00 X20's. Quote Live every day like it's your last, because one of these days, it will be. Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/ Share on other sites More sharing options...
Bigdogtrucker Posted March 29, 2013 Share Posted March 29, 2013 Deff. need to swap the rear gears,i'm sure somebody here could recommend a good ratio. Quote Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/#findComment-174953 Share on other sites More sharing options...
d427 Posted March 29, 2013 Share Posted March 29, 2013 My B61 has a 5.74 rear gear. I have had it to 45mph and seems like it would do 55 easily. Quote Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/#findComment-174971 Share on other sites More sharing options...
Maddog13407 Posted March 30, 2013 Share Posted March 30, 2013 anywhere from 4.28 or 4.62 would be good. those are two original ratios that come to mind. dont think Mack offered anything much faster back then. i have a 4.00 in my b model but it came out of a 75 U model. Quote Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/#findComment-175021 Share on other sites More sharing options...
Dennis Posted March 30, 2013 Share Posted March 30, 2013 I would change the rear end first. I put a 4.10 in my B which has a quadriplex trans. I can cruise at 55 mph in 4th over easily, and still have two gears left Quote Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/#findComment-175041 Share on other sites More sharing options...
Freightrain Posted March 31, 2013 Share Posted March 31, 2013 Better to find faster gears. To get enough OD to get it to even 55 comfortably that rear end will be sing'n. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/#findComment-175246 Share on other sites More sharing options...
Milaca Posted March 31, 2013 Share Posted March 31, 2013 Just thinking out loud for a moment here, but if one were to install a 5-speed main transmission and a seperate 4-speed auxillary transmission behind it, but mount the auxillary transmission backwards (mount the 5-speed output shaft to the 4-speed auxillary output shaft, thus making the 4-speeds original input shaft into an output shaft) you would then have 3 overdrive gears. The auxillary 4th gear would still be direct but 1st gear would be your 3rd overdrive gear. Has this ever been done? Any reason why it couldnt be done? Quote Link to comment https://www.bigmacktrucks.com/topic/30597-antique-plates-for-my-b/#findComment-175256 Share on other sites More sharing options...
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