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Welcome to the site! First check to see that the out put yoke bolt is tight on the trans!If so then you likly have a shift fork that is worn or a worn syncro pack this can be repaired in the truck but you will likly have to go to the dealer to have it done as it requires special tooling.

Its Called a VIP Its there to give you more information than you need to know!It also is there to cause us guys That work on em greif by means of giving you to much useless info !Having said that the truck will run fine with out it its better for me if you turn it off! However there is some decent info to be had from it some of the fault codes / fuel milage, boost, oil presure ,and ,water temps. it has a few good points. .

The truck has a vip you can check the trip and average mpg in that screen!Scroll there

bro it s a hard call with out the o/d!You could have somone look at the ecm avg mpg!

Warrety issues I think would have been handled by Mack .

Change the t stat 180 consistant! see what happens

Don't jump in yet,Whats been done ?Check history! maintance? The balance of warrenty is likly the block and stuff that won't fail!

Try turning the jake switch off while loading!If that don't work then you might try adjusting the timing a bit!The fuel pump might be worn some causing the timing to be off!Also what temp is it running at? to cold can cause this!

I would suspect valve guides or turbo seals !Does It smell like oil smoke or fuel!??Fuel smoke kinda burns the eyes! turn the jake off when your loading for a try thou.

Anything is possible! How much money do you have? You would need to build a new shift lid arragment! To involved for the average guy Id think!The lid has a lock out arangment inside that locks out the forward gears ya don't want to break somthing!

ffYup simple !Turn the jake off!As soon as the pedal is in the idle position the engine brake will engage!

Yup It Was A nightmare. ya had to be there to grasp the situation.It was embarrassing to say the least.Is the best words to describe it!

B61 Unfortunatley 3 Mechcanics didn't design and build this engine . Things would be a whole lot diffrent if they had. Don't forget this engine has been the back bone of the mack line for the last decade and all the stuff on it is bolton to get by reg's stuff the core engine is still good ole mack stuff. The coolant system however evolved, got changed to put up with the egr heat its been a dogs breakfast of problems since.They how ever have worked thru MOST of the problems! if 68 will send you all the sb for the coolant probs ensure you got ALL the upates Thermastat housing and plumbing reroutes ect the water pump is a quicky but make sure you get the right one! Hope ya get everything sorted out man. These engines can be made to hang in there, Problem is not everyone has the time, money or patients to get them there.

Trent two diffrent animals!22- 28 is spec on a v8 A good hot runing v8 500hp will be 28 -32 I beleive his is a 400!A 400 I would expect to see 22 24 maybe 25 max!If the fuel is stock!

Al the boost gauge was plumbed in the right spot the cross over is where to do it!You should be seeing 22 to 28 psi under a decent pull! You either got one hell of a leak or the turbo is not working right you should be trailing plumes of black smoke behind ya if theres a leak that big. Is the fuel pump robert bosch? if you don't have smoke .I would check the lda valve on the back top of the pump take the hose off at the engine end and suck on it if it will not hold a vacuam the diphram inside is fubar. Also if the engine has an air throtle make sure the dam thing is opening right up!

Worst part is if its the egr cooler your going to have to replace it now!If you do ! cap off that valve as Jerry did!

The pyro heating up indicates not enough air yes the leak has alot to do with it! BUT was this problem there when you changed out the turbo before?The turbo can look and feel fine but if thr wrong compressor wheel was installed at rebuild it will get warm! Check the gap around the compressor wheel if it has a big gap say 1/32 of an inch its got the wrong wheel on it Ive see this happen on rebuilds before. just somthing else to look for.

Time to plug off that egr valve!

You should put the driver on your truck !Then you can blame him for everything, It will make ya feel better. Off subject! No falt codes with the egr plug Jerry correct ?

Naw I'll be, awhile doin this, got to pick the time !As for the ecm I m going to gamble on the no change needed aproach. ive been off for a few weeks had my hand fixed couple of weeks to go.

Well Im going to find out ! I'll race ya!

Its been my observation that the puter don't care about the egr valve position! It looks for the target if it don't see the value it simply opens the valve more! If the egr cooler is pluged what code do you see?? I have had egr valves fail with no codes!!!I ve seen pluged egr coolers no codes! you can hear they arent working right. I was thinking the same about the plate we have several trucks I got in mind for this! If the flow is not there it simply opens the egr valve in turn it doesnt let the turbo spool but if there is a plate there like I said before, theres no place to go but out!!!!????

Yes!I beleive you can still get It! aint cheap!

Mack diffs can also have inter wheel power divider simular to the power divider setup these make alot of racket aswell.

And hopfully they will find somthing, we have done this before found to be low and had no resolve! Unfourtunatly the dealers hands are tied, you can't just try this and try that without having permission to do so!