1987 DM MACK X107

[mrsmackpaul]

Do you have all the remnant parts, maybe if you take some photos of the part numbers stamped on them someone on here can find whats going with the original box, as in what it actually is or modified to be if that makes any sense 

Count up the teeth on the gears and see what they are and then we can work the ratios out from that 

Paul 

[doubleclutchinweasel]

15 hours ago, TJ11404 said:

The whole problem started when I took the tranny out and took it to a guy who said he could fix it and tore the aux box all apart and then said he couldn’t find the parts to fix it so I bought a complete setup and put it in so as for checking the tranny that is out I can spin it over but the second box ain’t together so I am sure the ratio changes from the output shaft in the first box to the output shaft in the second box

Checking the front box in/out ratio would still be helpful.  This would tell for sure if the front box had an overdrive gear in it.

Some of these guys know a lot more than I do, but all the 2-stick Maxitorque auxiliary boxes I (personally) ever saw  had a "lo" and a "dir".  Never saw one with an OD in the auxiliary.  I would suspect that there is only one set of reduction gears in the auxiliary (for lo), and the "dir" is just locked shaft-to-shaft.  And, of course, the reverse set would be in there.  If the aux is "dir", the sliding dog clutches would just key the shafts together.  If there is an OD in there, then I would suspect the "lo" would be locked shaft-to-shaft, and the "od" would engage the overdrive gears.

What did it say on the shift plate?  LO and DIR?  Or DIR and OD?

[doubleclutchinweasel]

Here is some interesting info.  Apparently, there WAS a setup with OD in the rear box.  If this is the trans you have, then the OD on the compound stick can only be engaged when the main is in 5th.  But, I don't know if these had REV on the compound.  Doesn't sound like it.

I am going to dig more into the "late" production boxes, and see what they have.

Learn something new every day...

 

Edited November 2, 2021 by doubleclutchinweasel

[doubleclutchinweasel]

Here is some info about the later models, with REV on the compound stick.  But, I can't find anything on the OD versions (1070).  So, I don't know if they ever did one with OD AND REV both in the compound case.  But, it seems possible.  Again, the shift map plate would probably tell if it was a lo-hole or and OD setup.

Here is the plate (off eBay) for a lo-hole model. 

[TJ11404]

Ya that is what the shift plate looks like in mine

 

[doubleclutchinweasel]

IF that's the original transmission and IF that's the original plate, and IF the plate is correct, and IF there was an overdrive in there, the plate would lead one to believe the overdrive was in the main box and the auxiliary was direct.

Of course, I would still spin the main box to be sure.  That's really the only way to tell for sure.  See if the output shaft turns the same as the input in 4th or 5th.

Anyway, I hope you get it sorted out.  It's a real pain to give up highway speed.

By the way, I have a friend who, years ago, swapped out a 9-speed Unishift for a "split 5" Fuller in a B61.  He thought it was a 10-speed with overdrive, but it did not have a hi and lo range...just a lo and dir splitter on a 5-speed box.  Wanted more speed.  I tried to tell him his 9-speed was an overdrive box, and his Fuller was either a direct or would have roughly the same overdrive as what he had.  He was convinced the Unishift was a direct.  He was very unhappy after he went to all the trouble to put the Fuller in, only to find out it was a direct model...just like it said on the splitter (lo & dir)!  Lost at least 5 MPH.  Could have saved all that hassle just by shifting it and spinning the shafts, all while it was laying on the ground!  What he ended up with was essentially the same thing as his Unishift, without the overdrive.  Sorry.  Kinda went off on a tangent there!  That's neither here nor there.  Just kind of a humorous story.

Anyway, good luck getting it sorted out, and let us know what you figure out.

[terry]

On 11/2/2021 at 12:18 PM, doubleclutchinweasel said:

Here is some interesting info.  Apparently, there WAS a setup with OD in the rear box.  If this is the trans you have, then the OD on the compound stick can only be engaged when the main is in 5th.  But, I don't know if these had REV on the compound.  Doesn't sound like it.

I am going to dig more into the "late" production boxes, and see what they have.

Learn something new every day...

 

This is the real early six speed, the front box was a basic 5 speed with reverse, and the back box was a low and direct to use with the 4.17 rears, and the the overdrive had a direct and a wide overdrive to use with the slower rears that were used with the tri and quads transmissions.    terry

[doubleclutchinweasel]

12 minutes ago, terry said:

This is the real early six speed, the front box was a basic 5 speed with reverse, and the back box was a low and direct to use with the 4.17 rears, and the the overdrive had a direct and a wide overdrive to use with the slower rears that were used with the tri and quads transmissions.    terry

Correct.  The "later" ones are the ones I was more familiar with, where the REV was in the compound box.  I don't think I ever saw the "early" one in person.

[mrsmackpaul]

So if I'm reading this correctly, this truck is 1987 model and the box mentioned above is very early gear box

Would this early gear box even of been available in 1987 ?

 

To me 1987 is just yesterday and yes I do realise it is 34 years ago but very early Maxitorque transmission to me would be early 70's 

 

Paul

[doubleclutchinweasel]

No, the "early" box would not have been available.  Not even sure about the "late" box!

Just trying to figure out if a truck of that vintage could have had the OD set in the compound.  I never saw one that did.  But, like I said, I learn something on here every day.

[TJ11404]

I am in search of a 2090 or a 2100 transmission if anyone has one in or near PA

 

[doubleclutchinweasel]

https://www.truckpaper.com/listings/truck-trailer-attachment/for-sale/list?catid=35037&manu=mack&mdltxt=t2090

https://www.truckpaper.com/listings/truck-trailer-attachment/for-sale/list?catid=35037&manu=mack&mdltxt=t2100

None local, but somewhere to start.

[terry]

manders diesel repair,lakeville minn. real good people to deal with.   terry

[880joe]

I have a couple of 2090's that I would sell but I'm in Missouri you can probably find something closer

[doubleclutchinweasel]

On 11/17/2021 at 9:05 PM, 880joe said:

I have a couple of 2090's that I would sell but I'm in Missouri you can probably find something closer

Weaubleau!  You're just about 35-40 miles south of Warsaw.  Spent one hot-ass summer in Warsaw in '79, clearing a power line RoW from the site of the Truman Dam to a substation in Clinton.  They were still calling it the "Kaysinger" dam at the time, because of the location.

[880joe]

My dad hauled some rip rap on that project

[doubleclutchinweasel]

They say it’s a small world. 
that power line was the last clearing job I got to work with my dad before he died. Have lots of memories about that one. 

Edited November 20, 2021 by doubleclutchinweasel