Mating a Cat to the Allison HT755

[waterlodge]

I'm looking for the flex plate and starter ring gear to mate a Cat 34xx engine to the Allison HT755 in my Bluebird.
I'm reading online that this combo was offered in some Kenworth and Peterbilt trucks.
I called a few local KW dealers. All this stuff was made when the guy at the parts counter was still "a twinkle in daddy's eye"
I have a call out to Progressive in Jacksonville FL. No luck yet.
Does anyone have suggestions who can help me find these parts?

In fact I saw a 1970's MCI with a retrofitted 3406 and HT75x a while back. Didn't get to meet the owner. So I know it's been done before but not how.

Thoughts ??

[luvrbus]

Global in Tucson Az may have used parts 520-295-1372 ,is the engine eletronic ? the 755 is electrinoic controled,you don't want to the parts from Cat for the conversion last time it cost me almost 7G's with the adapter,depending on the applaction the Allison came from you may end up with a new torqe converter   

[Boomer]

Global/Arizona Transmission Exchange is out of business.  I was there last week and spoke with the widow of Kim the owner.  He died last Oct. and the place is largely empty but I did see a bunch of cores sitting in the back.  Sounded like she is trying to sell the place.  Don't know if she is trying to get rid of left over parts or not.  Call and maybe she will answer.

[luvrbus]

Global/Arizona Transmission Exchange is out of business.  I was there last week and spoke with the widow of Kim the owner.  He died last Oct. and the place is largely empty but I did see a bunch of cores sitting in the back.  Sounded like she is trying to sell the place.  Don't know if she is trying to get rid of left over parts or not.  Call and maybe she will answer.

Kim passed away over 2 years ago.I had a feeling it wasn't going to make it when she fired Bobby the son of Kim and turned it over to her boy friend

[chessie4905]

Can't really blame her. Not interested in the business herself, so sell and move on with her life. Too bad though.

[luvrbus]

Can't really blame her. Not interested in the business herself, so sell and move on with her life. Too bad though.

Transmissions were not their largest revenue intake ,they were into engine power plants for the oil field and I understand Bobby took that part of the bussines away when she fired him.There was some hard feelings since she wasn't married to Kim very long before he passed away,too bad but it happens when families get into pissing matches

[Boomer]

You probably right, I only heard her say Oct. when she was telling her tale of woe.  She was really knocking Richard and saying how she fired him too.

[waterlodge]

I've been digging a bit and it seems that the 755 behind a big cat was a rare combination. Detroit is the most common, cummins second most.
Lots of little 3126, 3116 cats with auto's but not the big ones

Another thing I found was that the 4000 series are all around better than the 755. More gears, more overdrive, higher ratings, and shorter. One of my limitations was the length if transmission + engine.
Although I've owned a bunch of 5,6,700 series Allisons and they never ever let me down.
Still, if something has to be custom made it seems better to upgrade.

Is there a difference between the 755 and 4000 in terms of how they mount to the engine? From what I've been able to see so far it seems the same.

[luvrbus]

Vogue,Newell,Foretravel and Country Coach all used the 4000 MH Allision behind the 3406 E,later they were using the CAT CX31 6 speed behind the E and C-15 the CX is plug play behind the CAT 3406 .I helped Sonnie install a 700 series behind his 3406 it cost and with the 1:1 final ratio we went to a 2:94 ratio rear gear to give the Cat a little breathing room it didn't like the 3:36 ratio not 1 bit

[waterlodge]

That Cat CX31 seems very expensive.

https://www.allisontransmission.com/docs/default-source/marketing-materials/sa7943en_-2017-vocational-model-guide_-vmg-lr9af07359281567eeb272ff0000a566aa.pdf?sfvrsn=13

The 44/45/4600 series have the wide ratio which is nice. You need that extra kick when you're trying to get out of a campground up a 10% grade at 12,000 feet.

And with the retarder they're only 30" long which is shorter than my HT755

[sledhead]

I have the 3406e with a 4060 and I am very happy with all of it tons of power and good mileage and no emissions . There must be lots of this combo out there as mine is a 1999 year . The weight of my coach loaded for a trip is 42k lbs

dave

[luvrbus]

I saw a BlueBird that burn sell cheap with a C-13 and a Allison,if you have the right gearing the World Allision B500 or 4000 series is the way to go,the 4060 has a PTO used for fan drives on most RV's

[waterlodge]

I have the 3406e with a 4060 and I am very happy with all of it tons of power and good mileage and no emissions . There must be lots of this combo out there as mine is a 1999 year . The weight of my coach loaded for a trip is 42k lbs

dave

Can you get your engine serial number and arrangement number from your engine? It should be on a data plate somewhere.
Actually the ideal would be the bellhousing number, it should look something like this
https://www.ebay.com/itm/3406B-Caterpillar-Bellhousing-7N8367/164802180788?hash=item265ef9b6b4:g:j3kAAOSwiHVf4Pyx

[waterlodge]

I saw a BlueBird that burn sell cheap with a C-13 and a Allison,if you have the right gearing the World Allision B500 or 4000 series is the way to go,the 4060 has a PTO used for fan drives on most RV's

Interesting you mention the PTO. My wanderlodge has the hydraulic fan drive directly on the engine (camshaft) but the Cat engine doesn't have such a provision so I need an alternative. Electric fans get nowhere near the power of the hydraulic ones. A PTO would be a possible solution. Although that makes the transmission about 10" longer.

[luvrbus]

The pto on the 4060 is on the side mine is ,it is amazing the hp and torque the 4060 handles mine is behind a ISX 15 Cummins 600 hp and 2050 ft lbs of torque