Popular Post terry Posted September 23, 2015 Popular Post Share Posted September 23, 2015 If you look close that trans. has three boxes bolted together, that is a real early six speed, and as far as that engine it is a 237. I also ran a 237 for years in front of a quad with a single disc pusher clutch in a dump truck, Never had any trouble, but I was the only driver. terry Also those early six speeds were direct and underdrive or direct and a real wide overdrive. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-304827 Share on other sites More sharing options...
other dog Posted September 24, 2015 Share Posted September 24, 2015 I'd hate to get rid of the sticks too, but a 300 or even a 237 with a 5 speed would be the cat's ass, as Larry Wales used to say, for what you're pulling with it, i'd bet you'd love it.You'd be blowing the large cars doors off on the hills too, instead of vice-versa.I drove an F model with a 300/5spd. for several years, had 3.87 rears and would run 80 mph. and pulled good too. They loaded 14 pallets of kyanite then, weighed 49,900 lbs, plus the bag weight, plus the pallets, totaled 50,155 lbs. and I hauled it all over the place with that Mack. 1 Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305007 Share on other sites More sharing options...
Underdog Posted September 24, 2015 Share Posted September 24, 2015 Nice. I saw an ad locally for 237/5spd for the same kind of money. Didn't jump on it.That has a drum brake on the back> when did they stop putting those on??My 237/ 5-speed combo ( which is for sale btw ) vintage 1970 has an empty brake drum on the output shaft. The truck had maxi brakes from new... Must be hand brake was still optional in 1970?!?Sent from my XT1254 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305060 Share on other sites More sharing options...
Coenut Posted September 24, 2015 Share Posted September 24, 2015 I have a 74 with 237/ 5 speed and it has the drum. Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305063 Share on other sites More sharing options...
Joe Ditchkus Posted September 24, 2015 Share Posted September 24, 2015 Larry I do not see an Intercooler on the Ebay engine. I had some 300's they had Intercoolers.Mine also had the spin on filters. You can pick up a Fuller trans reasonable 1100,1200,1400 series. Joe D. Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305065 Share on other sites More sharing options...
Gmerrill0516 Posted September 24, 2015 Share Posted September 24, 2015 Is there any risk in running an E6-250 two valve in front of a quadbox. My 815 is set up that way now...had the 255 V8 from Mack but I have no idea what the torque specs are from one to another. Could I get in trouble if it were loaded and I didn't know better?Don't mean to hijack the thread so apologies there. Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305067 Share on other sites More sharing options...
theakerstwo Posted September 25, 2015 Share Posted September 25, 2015 The ENDT250 engine did use the single counter shaft trans.Maybe all thru the late 60s and I think into 70s 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305070 Share on other sites More sharing options...
Freightrain Posted September 25, 2015 Author Share Posted September 25, 2015 That is why I was originally looking for a 250 motor. This 300 just fell in my lap(when I call the guy next week). I can always detune it a touch. I'd like to have it all though. Will just have to see how it pans out. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305142 Share on other sites More sharing options...
david wild Posted September 25, 2015 Share Posted September 25, 2015 One of the worst things I ever did was sell a fella with one arm my B61 with a factory sleeper, after he could not shift the triplex he had a 300 and 5 speed put in it, after he went swimming one day and didn't do so well, his widow sold the truck and I lost track of it. Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305149 Share on other sites More sharing options...
41chevy Posted September 25, 2015 Share Posted September 25, 2015 One of the worst things I ever did was sell a fella with one arm my B61 with a factory sleeper, after he could not shift the triplex he had a 300 and 5 speed put in it, after he went swimming one day and didn't do so well, his widow sold the truck and I lost track of it. Wallpaper hanger by trade?? Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305153 Share on other sites More sharing options...
Maddog13407 Posted September 28, 2015 Share Posted September 28, 2015 I think the e6 250 is a perfect engine for repowering a B model and leaving the factory twin stick single shaft trans. only problem is they are scarce. only think I ever saw them in around here was CF firetrucks. the 237/5 speed was common as PB and J around Ny and New England. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305415 Share on other sites More sharing options...
Freightrain Posted September 28, 2015 Author Share Posted September 28, 2015 Was thinking about this on my way back from Pittsburgh last night. They put 275 and 320 supercharged Cummins in LTLs so why is the mack 300 any worse? As long as it is not a Maxidyne version? 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305418 Share on other sites More sharing options...
Bigdogtrucker Posted September 28, 2015 Share Posted September 28, 2015 Was thinking about this on my way back from Pittsburgh last night. They put 275 and 320 supercharged Cummins in LTLs so why is the mack 300 any worse? As long as it is not a Maxidyne version?And 335's I believe. Cousin of mine ran a B81 triaxle for YEARS with a 300 Maxi/qbox. (and loaded HEAVY) Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305419 Share on other sites More sharing options...
41chevy Posted September 28, 2015 Share Posted September 28, 2015 Was thinking about this on my way back from Pittsburgh last night. They put 275 and 320 supercharged Cummins in LTLs so why is the mack 300 any worse? As long as it is not a Maxidyne version?How do the power bands compare? Paul 1 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305434 Share on other sites More sharing options...
Freightrain Posted September 29, 2015 Author Share Posted September 29, 2015 Just talked with owner. Have my doubts it is a 300. Likely a 237. No intercooler. But I will take it as it will be a big improvement no matter. Pick it up this weekend. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305559 Share on other sites More sharing options...
Gmerrill0516 Posted September 29, 2015 Share Posted September 29, 2015 Good luck with it. Hope it works out well.Greg Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305562 Share on other sites More sharing options...
Lmackattack Posted September 30, 2015 Share Posted September 30, 2015 Larry why not put a 300 with a 5 or 6 speed direct? You can still find those 6 speeds laying around for cheep. What is your current rear end ratio? If its in the 3.xx you will have a 70 mph truck with a strong engine and trans... Regardless I think the triplex will be fine with a light load for all your hiway driving you do. It's the heavy off road lugging that people were more worried about with the maxi / 72 series transmissions.I think you will need a different clutch linkage as the B and R models differed. One is a push style the other is a pull style. Also the pullys up front on the engine stick out farther on the maxidyne vs a thurmodyne.Regarding the eBay link "300"..... It looks like a early 237 or older 673. Just looking that it's not inter cooled. The pipe off the turbo goes directly into the intake. The 285 HP were side mount charge cooled and 300 were front mount inter cooled.. Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305585 Share on other sites More sharing options...
Freightrain Posted September 30, 2015 Author Share Posted September 30, 2015 I have 4.10 gears.Time will tell what the motor actually is that I'm going to get. If only a 237, that's fine. I'll up the pump to 250 specs and just run my transmissions. Like I said anything will be an improvement over my current motor. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305589 Share on other sites More sharing options...
theakerstwo Posted September 30, 2015 Share Posted September 30, 2015 Just use your old flywheel and housing on to the 300.I also changed front pullys and water pump plus the crank hub. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305598 Share on other sites More sharing options...
68-f-model Posted September 30, 2015 Share Posted September 30, 2015 How about this 300 and 6 speed 266k miles $1,500 , shouldn't be to far from you and might be worth taking a look. Still in a 1986 mack DM so you could run it before buying. https://columbus.craigslist.org/hvo/5188302440.html Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305616 Share on other sites More sharing options...
Freightrain Posted September 30, 2015 Author Share Posted September 30, 2015 That doesn't look bad actually. I might look into that if what I have going on doesn't work out. It is about an hour south of me. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305617 Share on other sites More sharing options...
theakerstwo Posted September 30, 2015 Share Posted September 30, 2015 Also you may need a different air cleaner. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305688 Share on other sites More sharing options...
Maddog13407 Posted October 1, 2015 Share Posted October 1, 2015 I have heard rumor a 237 or 300 will suck the oil out of the oil bath turbo air cleaner on a B. might be worth changing to a paper filter rather than having the engine take off on you. Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305710 Share on other sites More sharing options...
Freightrain Posted October 1, 2015 Author Share Posted October 1, 2015 Yup. Definite upgrade. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305721 Share on other sites More sharing options...
Bigdogtrucker Posted October 1, 2015 Share Posted October 1, 2015 I have heard rumor a 237 or 300 will suck the oil out of the oil bath turbo air cleaner on a B. might be worth changing to a paper filter rather than having the engine take off on you.I've heard people say that too, but I've driven a few B's with the original air cleaners and Maxidynes. Wonder if that's ever happened or just a myth? Quote Link to comment https://www.bigmacktrucks.com/topic/41877-300-in-a-b-model/page/2/#findComment-305739 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.