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Good point Joe ! We may have been side tracked by the original post thought! how ever it should be trailing smoke under load and pyro should heat up quickly if a leak exists Just a another thought ! A stock 350 should make roughly 24 - 28 PSI boost ,a stock 427 somewhere around 30-32

I know for a fact if you go from 355/380 to 460 you will be short On boost by aprox 8 psi with the stock 460 engine file if the key is wrong ! Been there done that! and Joe never got involved in the cam check procedure ! found out by vins! and trial and error! 😡

What engine powers the the Honkey tractor Rob? Nice looking unit! I have a 1972 David brown on my little claim here tough as nails! its powered by Perkins as one would expect given the name! Its my wheel borrow wy forklift powers everything I got from my saw mill to my rototiller! would love to have a 3 point mower !

You may be able to change the data file how ever you may have to change the cam key not sure mac pro may chime in on this! Its getting harder and harder to work with older units as the Volvo Turds are busy in the back ground trying to dis mantle the Mack infrastructure! By making it hard if not impossible to do many of the older unit programing sequences! hopefully Pro will chime in!

this question Joe asking is important! older trucks used a Relay on the dynatard system! Just sayin

I know you say you have know leaks how ever I wouldn't count on it! Your symptoms are lack of air ! Cracked after cooler /Bad turbo/ air compressor feed hose /intake gaskets blown out or something I would take a second look if it were me! Limp Mode would be opposite no smoke no power! physical problem of some sot in my mind! Just sayin!

Its funny how things go! We have converted quite a few magic fans back to air for the same reason! That said the new E magic fans seem to be more reliable than they were! The first Berr fan was a complete nightmare! Sourced from some sweat shop I suppose , Duno! We replaced dozens of them some would come leaking right out of the box some had to be changed before the truck left the lot!😡

yup

Electric over air!

correct Joe ! The way I understood it at the time was for driver feel ! the min max setting Made the engine brake respond as if you were driving a cummins or mech engine , You had to have your foot all the way off the pedal for the engine brake to engage (NO Fuel position) .The all speed setting was as if you were driving a Mack with a normal dynatard instant response as you let your foot up even a little on the throttle the brake would come on ! Just my thoughts on this ! As mentioned above we were encouraged to set min-max for best the throttle response!

Yup pretty sure its in there I know they moved things around a bit in the vmac 2 card how ever the setting things should be in tact in one of the heading! Switch status comes to mind!

on rare occasion seen drums out of balance !

Our Freinds down under seem to have a better handle on the needs of the trucking industry than here in north America ! We don't pull trains here however we do have some steep terrain may be not a big enough market for their liking! Who knows ! If mack still offered the MP 10 here they would still sell just not as much as they would like !

Yup very possible!

boost leak check all the hoses to the after cooler and engine

After you have checked your simple stuff the rad cap ect ! Most common issues on this subject are EGR Cooler Failing Second in line are the injector cups can cause this however usually also give other issues hard starting slow to start indicaters! Water pumps fail once in a blu moon similar but not the same symtoms with over heat . our first check would be the EGR cooler

Most of the changes in gearing here we used to do was to change to 4.64 due to the V8 ! Anything over 400 would eat the 4:17/ 4:42 ratios for breakfast in the offroad type settings here! lots of hills! Used rebuild lots of these top gear sets would pit out and break! the above ratios were a simple top gear set change!

assuming its a Mack ! not enough info what year and model of truck! engine model mp7/ 8 or gray E7 engine!

Does anyone know why GM still makes GMC / Chevy same truck different trim ! Volvo/Mack Same truck Different Cab and hood! Marketing strategies I guess! Its been going on for years firebird ,Camaro , chevlle/ boulmont just to name a few!

Im not trying to be a smart ass here but you do have a 12 sp trans and half gears with a 12 speed! a half gear lower to low? just asking! your sweet spot will likly be 1400- 1500 the 1600 will be best fuel economy with the half gears you should fine something that fits with the 3:87s!

Good Call pro ! And pay attention to the dollar store pex clamps that everybody are using on the the charge air these days They are garbage ! if in doubt replace them with real clamps you'll be glad you did! seen these fail on lots of units specially on the hot side of the turbo !

they rarely cause issues!

My opinion ! Top of the list , you need to check for exhaust leaks turbo gasket exhaust gaskets (broken exhaust bolts and boost leaks to start with , broken clamps bla bla. check the intake manifold at the front below the egr mixer tube for broken bolts and for a crack associated with a broken bolt front lower bolts have a tendency to break! After cooler split!? The egr cooler my be plugged this will cause the egr valve to open to much and result in little to no boost as the ecu is detecting low flow also the dp sensor on that circuit is susceptible to plugging again low flow issue . bottom line lots of shit to look for. those are just a few . just a few places of many to look!

12 speed is a dandy dump truck trans 5 speeds for reverse is a wonderful thing ! some Things to watch for have been mentioned ,to add to the list pull the counter shaft caps check the rear bearings For pitting replace as necessary these can be done with out other disassembly, if you are removing the air shift to re oring check the reverse gears, the idlers also can be replaced or turned around if need be to reused with out to much disassembly the reverse gear and these idlers used to take a beating when drivers were impatient and didn't wait till the truck was static before shifting to reverse! otherwise The trans was decent!

(If you're paying $10k for a clutch job, you're getting robbed ! ) THATS THE POINT! Flywheel grind ! If someone walks in off the street to have a clutch replaced and you have no idea how many times the clutch has been done you replace the flywheel for your own safety then you can Provide the whole job with a solid warranty with out worrying about a backfire !As for using a recon actuator Our luck with most ReMack Parts is not the best! Not the most quality stuff in my mind I would just rather start over! start from scratch ! And not have to do it twice! Just an opinion