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My initial thought is NO. Everyone says to but I don't want to worry about something going wrong. These transmissions arent on every block anymore. My next thought is get rid of the 4.10s for a set of 3.55s if I can find a set for a Rockwell. Then I can run a 13 spd. If changing rear gears becomes a hassle, I want a true double over 13. Not a homemade version. I want more road speed at lower rpm(noise level). I will be removing the little 6041 box I have hanging in there. Much to fragile.(I'm a gearhead, I want something I don't have to drive like I have an egg under my foot). I had thought of using the 5 spd that came with engine and find a 1241 and use it for splits, plus if I get a 1241C it has deep under like my 6041. Lots of "maybes" and "ifs".

So my truck has a AI motor with a t310 behind it and it is honestly a miserable experience I live in the mountains of wnc and maybe 10% of my driving is on the interstate and that is not very flat but at interstate speeds for the most part is okay but any sort of slow moving as in 20 mph or under up grades and around switch backs is awful like embarrassing for one if you miss a gear you pretty much have to stop and restart but I guess my issue is most of the time I have to stop it is because I missed a gear which is pretty normal with this pos Trans and then on the restart whatever gear you start in you are stuck in until the hill planes out because maybe someone can but I am not able to ever up shift fast enough to keep the motor in its power range to continue on because you have to pause for a split second for the rpms to fall and by the time it will happily go into gear its way past being able to pull its self and as embarrassing as this is the other problem is I drive this thing every day and everyday is like my first day I can go for a hour our 2 and not ever grind or miss a gear and then if I grind it once it seems like that is the trend for the rest of the day up shifting is not honestly as big of a issue I have found if you shift around 1800 rpms it normally falls right in but down shifting on the other hand I normally only make about a hand full of down shifts with out grinding every day it honestly surprises me the times it falls in I have honestly found bring the rpm up slowly and trying to slide it in is normally the easiest, and the other issue is that if you leave the engine brake on up shifting is not happening but down shifting is okay as long as you dont miss but thats any truck, all this stuff sounds like beginner issues and I guess it is this is the only mack I have ever drove and if I would have known alittle more about it honestly I probably wouldn't have bought it just as far as the motor and trans go it makes me mad because I have drove trucks for about 10 year and I have driven all different makes and models and have never had any of these issues I have driven pretty much every eaton they make and it has always been smooth, any advice is much appreciated

That is only true for engine that use a rocker to work the injector. Engines with an injection pump (mech Cat and Mack) there isn't the rocker to trip the the exh valve at injection. So on those they have to use a valve on an adjacent cyl to trip and the timing isn't exactly right. It is why a mechanical Cat's Jake isn't as good as one on a Cummins. Once mfg went to electronic common rail with the cam pushing the injector and the electronics adjusting timing an duration, Jakes matched those of Cummins. 2 stroke Detroits had there own problems, keeping a Jake on those limited.

Yup yup a fart in the wind has better holding power!😂

one day if time allows. do the cheat sheet method of adjustment ; then go back to one cyl at a time see if any difference. the better jacobs is an add on with jake unit holding down exhaust valves AT PRECISE cyl firing. the dynatard being built in has those over sized rocker adjusters which are simply small hyd slave cyl. that combined to a screwy cam make the Daynard "work". the dyna has to be on cyl TDC for proper adjust. pushing down on rocker to completely expel all oil in slave cyl. short version the dyna ain't worth sh- - t ;makes some noise. fred flintstones car had better braking.

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Larry , i might have missed it, gonna run the triplex behind it? Terry

Rockers and valve covers and push tubes to make it work! The Jake’s should work from the other engine! As it works off cam lift! Dynatard is rather feeble! Jake is moderately better!

The 237 is a huge upgrade from the 673. Can't wait to see it with new motor! I found out last winter that my throttle was not quite wide open at WOT. I adjusted the arm just a touch and WOW what a difference. It really pulls the hills now. It was good but that last little touch of fuel made a big difference in keeping speed with my trailer on steeper hills. Always had to drop a gear, now I can almost not have to. Can't imagine another 100hp?

I used to have to work on 675's with the dynatard but I haven't touched one in almost 40 years so my memory of setting them up is a blank. That 300 will make the B into a hot rod compared to your 673 when I installed the 260 hp it was a noticeable improvement. I am very glad I spent the money for the jake that is on my present engine.

Who is holding up the middle lane that you have to pass them on the right?!! LOL! 🤣😂🤣 .....Hippy

my thoughts exactly. i dont go to work. i go for a ride in new trucks and burn expensive fuel while pissing off the people behind me by doing 10mph under the speed limit in the right lane.

Well Larry I’m glad you decided to go through it that’s what I would’ve done I’m sure most of us … bob

Ok, it makes sense. It uses an adjustable rocker cup to apply extra lift to open the valve instead of a Jake housing. Normal setting it has lash, once pressure applies it pushes rocker further opening the valve. Kinda ingenious actually.

Have a read through this thread, ut may help or maybe just confuse the Dynatard understanding Paul

Austin, Texas's LGBTQ proponent fire chief Joel Baker refused to deploy for the Texas flood. Worthless excuse of a human being. .

I've run valves, so I understand the procedure. On my hot rods, I always do one cyl at a time. They have cheat sheets on how to do multiple cylinders at a time but I never do it that way. Ever. Even after getting grief for it. "Oh, you're taking too long". Whatever. This having so much lash surprised me. Why does it require so much for a "dynatard" cam? What is special about it? I'm just glad it isn't a cam lobe problem. I did the valves on my 237 and the Jakes without issues. I know Jakes are different but I followed the sequence and they work fine. I want to transfer the Jakes over to this engine, if possible.

Yeah, my "education" was decades ago, but I still remember that today.

Joey has mentioned this Many times on here ! Can't stress it enough! Many get caught on it!