1988 R model Posted June 30, 2022 Share Posted June 30, 2022 I have a 65 b model I wanna put a 237 with the 5 speed behind it has anyone els done this and what’s the best way to go about it Quote Link to comment Share on other sites More sharing options...
Popular Post mattb73lt Posted June 30, 2022 Popular Post Share Posted June 30, 2022 It's been done many times. Search this site and I'm sure you'll find someone who's documented it. I have a 237 in front of a Triplex in a '63 B42 converted from a EN402. Original swap was a END-673. If it's a B61, it's pretty straight forward. If not, like a gas powered one, it still isn't too hard. You just need more parts, like the front cross member, transmission mounts and a bunch of small parts gassers don't come with. The frames are drilled for both gas and diesel mounts. Waterpumps, flywheels/bellhousings may need to be swapped. Depends on your skill set and shop equipment, too. The stock radiator will handle the 237. 8 Quote Link to comment Share on other sites More sharing options...
davehummell Posted June 30, 2022 Share Posted June 30, 2022 My b-42 must have had the diesel conversion at some point in it's life a couple of years ago I stuck a 1980 260 hp 673 under the hood with a double over triplex the radiator does a fine job no overheating, and the truck really cruses out on the highway. Quote Link to comment Share on other sites More sharing options...
Draggin Wagon Posted July 1, 2022 Share Posted July 1, 2022 I would suggest the large radiator if you are dealing with much weight especially in hill country. The large radiator has a snorkel neck in top tank to fill the radiator. My old Draggin Wagon had the small radiator - no problems bobtail even in mountains. Hook camper to it, grossing around 25-26,000, really had to watch temp Quote Link to comment Share on other sites More sharing options...
1988 R model Posted July 1, 2022 Author Share Posted July 1, 2022 Thank you very much and thank you for the pictures this truck is just going to be a driver not working so not worried about pulling Quote Link to comment Share on other sites More sharing options...
Freightrain Posted July 1, 2022 Share Posted July 1, 2022 (edited) I put a 237 in mine also. Simple swap from the 673. Just changed waterpump and balancer. I still run a triplex. I have the big radiator and does fine with my 30k lbs. Edited July 1, 2022 by Freightrain 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
1988 R model Posted July 1, 2022 Author Share Posted July 1, 2022 7 minutes ago, Freightrain said: I put a 237 in mine also. Simple swap from the 673. Just changed waterpump and balancer. I still run a triplex. I have the big radiator and does fine with my 30k lbs. Mine is the gas 331 I know the water pump neck is longer on the 237 but why dose the balancer have to be changed. clearance issues? Quote Link to comment Share on other sites More sharing options...
Freightrain Posted July 1, 2022 Share Posted July 1, 2022 My balancer was missing on 237, but I think it is too long and will hit crossmember. The R model has much more room behind the radiator and the pulleys stick out farther. Thus the waterpump needs changed also. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
mowerman Posted July 2, 2022 Share Posted July 2, 2022 Excellent videos Larry thanks for sharing and Matt that thing is gorgeous I used to know a guy out here that had one set up exactly the same way it was the same color and condition… bob Quote Link to comment Share on other sites More sharing options...
txjcfsr Posted July 20, 2022 Share Posted July 20, 2022 (edited) With much advice from Freightrain, I did the ENDLT 673 to 675 237hp swap on my B61, also. Still putting the finishing touches on it, but am now able to do some "shake down" runs in it. Now, I need to swap the rear end gear to get better highway speed. Don't mean to highjack this thread, but has anyone else done that? Edited July 20, 2022 by txjcfsr spelling 1 Quote Link to comment Share on other sites More sharing options...
davehummell Posted July 20, 2022 Share Posted July 20, 2022 I pulled out the rear that was under my truck and bolted in a freightliner air ride axle 3.73 axle ratio I run low air pressure with an air seat I have back problems. Quote Link to comment Share on other sites More sharing options...
mattb73lt Posted July 21, 2022 Share Posted July 21, 2022 I swapped my carrier from a CRS-84 to a CRD-117(From a R Model) with a 4.62 ratio. Very easy swap into the rear end housing, then a little driveshaft work to make that fit. The 4.62 was perfect for me, 80 mph top end and at 65 I’m turning about 17-1800 rpms. I have a double overdrive Triplex in it and that gives me good flexibility from local roads to highway. You just need to figure out your ratios, tire diameters to get your cruising rpm right for the speed your looking for. The R model carriers are plentiful and have a wide selection of ratios. Plus, they’re newer and parts are more readily available. 1 Quote Link to comment Share on other sites More sharing options...
Licensed to kill Posted July 21, 2022 Share Posted July 21, 2022 22 hours ago, txjcfsr said: With much advice from Freightrain, I did the ENDLT 673 to 675 237hp swap on my B61, also. Still putting the finishing touches on it, but am now able to do some "shake down" runs in it. Now, I need to swap the rear end gear to get better highway speed. Don't mean to highjack this thread, but has anyone else done that? My truck is still under construction but I swapped out the original rear for rear from. 2016 Freightshaker with air liner suspension. Mine has a 2.53 gear and I will be running a Mack 6spd (no OD) so at 65MPH I will be turning 1250RPM with the 11R 22.5's. The engine (2 valve E6 350) produces max torque @ 1250RPM so, to my way of thinking should get it's best fuel economy there as it will just be lumbering along making more torque than required so not working hard at all. Mine is a single axle only intended to pull my holiday trailer. 1 Quote Link to comment Share on other sites More sharing options...
Freightrain Posted July 21, 2022 Share Posted July 21, 2022 Mine had 4.62 also, now 4.11. I did the gears before the 237 install or I would have stayed with the 3.70s that were in the air ride rear when I bought it. Single od triplex, 4.10, 11r22, runs 65 at around 1800. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
davehummell Posted July 21, 2022 Share Posted July 21, 2022 My triplex is a double over. I can roll right along on the interstate with 3.73's in the rear. I bought a jake brake off the junkyard that sold me the rear axle great Addison to my truck. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post davehummell Posted July 25, 2022 Popular Post Share Posted July 25, 2022 I went for my first ride yesterday in my B two months ago a guy blew threw a stop sign and I ran into his truck with my can am spyder this is the first time I could get in the cab picked up my neighbor and took him along over to get some fuel he admitted that it was a secret wish to get a ride in the mack made his day. 3 Quote Link to comment Share on other sites More sharing options...
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