Vladislav

I have a manual which is entitled as T2070A. Common reverse style but long rear compound. In fact it's half empty compartment if you look through the top cover opening. There's space for the reverse setup but it doesn't take place. Probably the reason is possibility to install PTO. Short compound housing doesn't have the mounting as I mentioned above.

Looks like a well cared truck from the distance. How could you track the suspension??

You are probably right. I have only a few Mack tranny manuals but one about T2070 represents long compound only. Also there's a brochure (below) posted on here in the past which also describes T2070 in the long housing only (note the length in the list). And two actual 7-speed trannies I could adopt locally both have long 2nd housing. On the other hand I see no reason a 7-speed can not be done in the short version.

Upps... I'm interested since kept my eye for something like this for a while. But I'm not sure I'm able to import at the moment due to the known situation. I will ask forwarding folks tomorrow on current possibilities. If anyone else leans toward making a deal on this starter I'd step aside.

Hope it's not difficult to fugure which one is long and short. The particular pics represent short version T2090 (I have almost similar T2060 in a truck) and the 2nd unit is the spoken T2070 long compound I installed on my R in place of the "short" nine speed. Had to cut the prop shaft and tinker with shifter air lines a bit.

Pretty easy way. Long compound T200's had cylindrical shift cylinder housing attached to the rear end of the transmission housing above the prop shaft flange. Short compartment versions have that cylunder hidden below the top cover of the compound housing so you don't see anything sticking out above the prop shaft. Also there's a PTO flange (usually plugged with steel cover) on the long compound housing and short version didn't have any side covers. Actually long compound housing is nearly 15 cm longer than the short. So easy to figure out if you have another style ever seen. BTW I'm not sure T2070 was offered in the short compound version. T2080 was.

Yup, that's the one. Also was close to be called a glider kit.

They had interesting offer on a heavy specified Superliner with decent double frame as it was seen in pics. The point was the truck didn't have an engine but everything else was there including cab, hood, radiators, Mack rears and tranny. Seemed as a perfect base for a resto project but there was no price tag either. I spinned some thoughts in my mind but figured to not stir the pot making a call. Now it seems gone.

I rifled through those glider pictures and didn't notice a Superliner. So figured you ment the one in the background of the yellow DM-800 shot. Speaking the truck you noted Joseph Equipment have plenty of listings on Truckpaper including a few RW's of different kinds during the recent years I checked the site from time to time. The prices are never put in their ads with "call for a quote" for everything. So difficult to judge the affordableness if you don't actually have particular reason.

Do you mean this one? I'm pretty sure the owner is known well enough.

I belive those with the slotted nut at the bottom are only adjustable to compensate axial play. And if the bushings or the pin walls are worn no use of tightening the nut.

Really sad events. I saw the aircraft when it flew carrying Buran shuttle near Moscow ring road in 1988 or 1989. Plenty of time passed since. Don't lean toward commenting what happens in Ukraine now, the most info I have is from media and generally the same as you can learn in your country. Personally I can say the least I'm shocked. And couldn't belive even in the morning of the 1st day when heard the news. Sure sanctions will affect my incoms and abilities to provide the resto projects. But the matter that bothers me the most is what Paul mentioned in his post above. Vlad

Excellent stuff! Drool.

Yes, sometimes we may be dealing with not pleasurant circumstances. Or may be involved into.

Yes, that's me. Sorry, can't understand the meaning of "not easy hit'n send". The thread was posted by Randy 1958FWD who was in contact with Hat. I just pulled it from where it was in "Odds and Ends"

Unfortunately guys you are late to the party.

Definitely better!

Time will tell

You already helped alot. And it's quite a common case when even very clever person may be achived in stupid situation just not knowing some key point. From the post you shared about engine repairs etc it clearly seemed to me that your knoweledges were deep and skills very impressive. But the fact you are eager to share the info and help others is very appreciated. Nice to discuss with you. It's already late time at me. I'm off to a sack

That's what I would suggest using logic, the same as you did. But looking the pages of the manual you posted the T2080 short compound box also shows the synchro installed.

Actually there were 3 sets of gears for the main boxes utilized in T200 series. One for long steps of nearly 70% for work with Maxidyne engines. Those had 5.24 1st gear and 0.60 overdrive. This was achieved by "fast" constant mesh gear set. The use was T2050, T2060, T2070(B) and T2080(B). Another combo was for 40% steps and took place in T2090. 1st gear of 2.79 with 0.71 overdrive. Intersting point the overdrive gear set was the same parts as in the 1st lot used (T2050 etc) But slower constant mesh made the overall overdrive ratio slower (0.71 vs 0.60). Adding a second compound to T2090 Mack turned it into T2130 and T2180. One more main box gear combo was used to get nearly 30% steps in T2110 10 speed unit. The constant mesh was again lowered a bit and the overdrive ratio became 0.77 (still having the same gears on the main shaft/counter shaft). Basing on this design an interesting modification T2110B was made. It had its special feature of one more "low" set of gears installed in place of the reverse gear in the main box. So you have 6 front speeds on the stick and this tranny was offered in a "B' mod only since reverse needed to take place somewhere and was moved to the compound box. Speaking the compound box there were 3 variations of its low range ratio. The fastest was used in T2060 so the only gear of the main box (1st) became lower when the Lo range shifted (and the tranny obtains 6th speed). The medium took place in T2070 setting 2 gears off into the lower range (5+2=7 speed). And the lowest of 3.84 was used in T2080 making 3 gears lower than the Hi range so 3+5=8. All the highway trannies starting from T2090 used that same compound gear set of 3.84. 10-speed and 11 speed units achived a bit slower constant mesh ratio again so 5 speeds formed the Lo range. I put all that info together to show that Mack made a whole family of different transmissions using only 3 sets of gears in the main box (even with only one gear set for overdrive) and 3 sets of gears for the compound box. Don't know who may be interested in these facts but was going to share them systematically for general use.

What also put me off the tracks is diagrams someone shared on here a long while back. If you look at the first pages of these two the T2090 sheet mentions a synchro in the list of options. And T2080 sheet doesn't. I have similar files for the whole T200 series and everything higher than 8 speeds mentioned synchro with lesser speed units don't.

Wow! Many thanks for the quick answer and immediately scanned images! From the diagrams you posted both T2080 and T2080B have synchros. The unit of my desire is a long compound housing with outside shift cylinder. So it's definitely a "B". There was a tag in the cab of that truck which also said that. And there was a stick off the transmission with spinning trigger. Funny thing I already purchased that cab and the stick was laying inside of it. So the only thing I need to add is the tranny The truck was a 1998 DM concrete mixer which worked mostly in the city. So my hope is the drivers seldom shifted the ranges and the milage was not exremely high either. I may take the top cover off for the inspection but you can't see condition of the synchro teeth without taking it off and apart. On the other hand the cost of the tranny turns out as a half of a new PAI synchro set if count together with the mating gears. Or nearly twice more than its scrap value. So seems worth making a try. Good collection of the manuals you have! I also stocked up a little. Have T2090/T2100 book, T2110 and T2070. But missed a chance grabbing one for 2080. Kept in mind it should be similar to T2070 and T2060 with only different compound box gears (which are of the same ratio as T2090 BTW). But now seems a worthy bit of info slicked off from my attention.

I always suggested that T200 series trannies utilized synchronizers for the range shift starting from T2090 9-speed and further to multy-speed units such as T2100, T2110. T2130 and T2180. T2060 and T2070 (and T2080) have much deeper 1st speed in the high range so my guess was they didn't use synchro because you don't shift Lo-Hi on a highway and only ocassionally when on a job site. So less times of the parts to couple, less wear and not much need in the expensive synchronizer. But recently I met a listing (on evil bay) representing synchro repair kit which was described to be used in T2080(B). I made more googling and other sources (mostly related to PAI parts sellls) mentioned Mack synchronizer and mating gears suitable for T2090 and so on but T2080 and T2080(B) either. Were those 8-speed trannies equipped with similar synchro as 9 or 10 speeds had? Or starting from a certain time maybe? Unfortunately I don't have a book particulary for T2080. The reason I ask is there's an 8-speed unit for sale locally. I could grab it for parts but saw no reason since I already catched 2 T2070 and have 2 T2090 to rebuild. But if there's synchro in that T2080B I would be much more exited to add it to the inventory. Thanks in advance for any input. Vlad

Thanks for the tip. I count me as a puppy welder so far. Only play 3 or 4 years with a wire welder. And from time to time, way far from a everyday job. Trucks have thicker skins than cars so easier to put body seams with no overlap. And you can also be 'braver' with a hammer. Green Mercedes in the photos is 1mm steel. Macks go smoother. And sorry to load up the thread with off-topic stuff. Subject related though.