terry

Maybe was changed by a previous owner, trying to give it a little more power?    terry

Round ones were early housings, don't know the exact year they went with the square housings.    terry

I’m thinking no the bronze bushing spindle I believe is threaded on the end and I don’t know if the 44K rubber bushing has any threads.  Terry

Is it a camel back suspension?  Terry

Can you post some pics. Of the 44 cutoff?    Terry 

30 minutes ago, RS Disposal said:

Thanks for all the insite.  Got word back from the machine shop. Heads was magnafluxed and no cracks.  just need to pick up the necessary parts to do a valve job

Got lucky!  Terry

11 hours ago, SpreadingLime said:

That one will be the envy of all the wrecker guys in your area. Even if they won't admit.

And probably work circles around all these emission choked junkers!   terry

I know its aways away but manders in lakeville minnesota parts out alot of older and newer mack trucks.   terry

Any six speed I have driven always had the main box in 3rd, 4th, or 5th gear, depends on your needed PTO speed.   Terry 

Don't know about thread locker on the rod bolts, but on head bolts be sure to run a bottom tap in head bolt holes, and blow out with air, and a die on headbolt threads and , oil threads and washers as you said.    terry 

41 minutes ago, mechohaulic said:

interesting to read last two post = "ole reliable" = sweet running. possibly due to simple technology was used to built  work trucks in the day. short version == got a phone call yesterday while CT was having heavy rain. driver says his '17 KW triaxle dump had a slight problem. he went to raise passenger window = the door locks started cycling but the window wouldn't work; same for drivers door. I said used the hand crank !- duh there isn't one. there is a module in the door. door apart , raise window by hand .unplug module..  point is "new" junk NOT reliable anymore. 

It's terrible how all this newer stuff is a POS!

1 hour ago, Full Floater said:

Good tip!   Just tried mine.   She's seized.....on to the penetrating oil...

Might need a little heat or as I call the blue wrench!  Terry

I think a G733 was originaly a cummins engine with a turbo.   terry

Learn something new every day! Guess i just never heard it called that.    terry

What are you referring to when you say pinion gear in a transmission? Maybe I’m missing something?    Terry

On 10/19/2023 at 7:43 AM, Licensed to kill said:

Yes there are shims under the bearing covers. I removed some to get to .002 endplay, will remove another to get to the prescribed preload. This will be a different adventure for me as I have never played with a trans much before in fact only once when I tore the 3spd from my model A down. Just a LITTLE bit different than these. This measuring torque to determine preload is also something new for me. The only time I recall setting preload is on wheel bearing and, IIRC, I torque them to 200ft lbs, turn the wheel to set the bearings, then loosen them off and torque to 50ft lbs for proper preload. Something like that anyways. I will check the end play on the main shaft and the lash on the gears today, if they are out of spec I will require guidance to make the necessary adjustments. 

I know it’s your transmission but with .002 endplay I would call it good, the only place I have set gear backlash is on PTO’s, different gasket thickness’s, there is no way to set backlash between main and countershaft gears. Terry

1 hour ago, Licensed to kill said:

Yes the rear cover is flush so, if both shafts work in tandem then the adjustment should be able to be made from either end. That being confirmed, I will do my adjusting from the back. Don't want to sound like a dimwit by repeating stuff, just want to make sure I understand correctly. I will go out and see what I can accomplish and report back.

It is definitly set on the rear of back countershaft.    terry

237 hp engine.  Terry

But when you preload does that take all your end play away?  Yeah them figures for new and used bearings are right on, I never used the string and scale, I used the dial indicator, don’t remember how many thousands though.  Terry

Joey I looked in one of my old Mack manuals it says on reassembly leave top main shaft out of back box bolt cases together and wrap string around counter shaft and set at so many pounds pull, I never done that to much crap! I used the dial indicator after assembled and set at so many thousands but I don’t remember the exact number.  Terry

Yeah rear box will work to, some don’t have PTO openings, the rear bearing on rear countershaft is held in by a tapered bearing towards the front, the rear cover  and shims press on the bearing outer race to set endplay. Hope I’m explaining this so you understand?   Terry no snap rings

For some reason I thought the PTO gear was fixed, if nothing else it can be done on the tail end of countershaft with the rear cover off. But I think the PTO gear is pressed on so tight you don’t have to worry about it moving to check this.  Terry

Been along time since i have done this, but take a dial indicator with a magnetic base and mount it somewhere around PTO , find a fixed gear on countershaft , configure indicator to touch it, take a small pry bar to slide fixed gear forward and back to check end play, then there are shims under countershaft rear cover piece to add or take out shims for desired endplay. Joey might have a different way to measure this.  Hope this helps     terry Think i used the PTO gear to do this

As far as telling a duplex, triplex or quad. Back box length will tell you.   Terry