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Discussion Starter #1
I'm doing a dt360 conversion an I am at a standstill on what trans to use. Do I use my 5R110 that is in the truck now which will require a pcs an is very difficult to tune from what I'm told an require a adapter plate an flex plate. Or use a 6speed Allison from a pickup that will only require a different bell housing to bolt to the engine an I can get a stand alone controller from destroyed will still require a billit flex plate but no engine adapter. Or go 4r100 from what I have read the tuning is pretty simple on this trans.
If this helps the plans for the truck are it be a dd be able to tow 20000 lbs plus coast to coast an not grenade the trans or cook the motor. Shooting for 500+ HP which is not going to be a problem out of this engine i hear.
 

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i fully intend to do this same conversion in my 03' f450.. I had wanted to use the 5r auto thats in it, but getting the conversion parts had turned into a real pain in the ass... Bottom line i'am gonna keep it simple, and likely a lot more reliable.. I bought a remanufactured spicer 7spd od , now all i gotta do is find the time to do the conversion... If it were me i would go that route, or the allison if you want to stay auto..
 

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Discussion Starter #3
I'm going stay auto for sure. I would love to do the Allison but not sure how hard it is to tune.
 

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last i looked, a controller for an allison was more costly then one for a 5r.. The comments i have read about 5r's being harder to program as well as my getting adapters for the engine, is what spooked me off.. This being said, i would say as many different engies as the allison can be had behind, surely it's a simpler process...
 

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Billy Big Rigger
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Why not find a medium duty Allison thats all mechanical to go with you mechanical engine? No tuning required and easy to find adapter plates that arent custom???
 

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Discussion Starter #6
Allison 1000 only requires a different bell housing to bolt to engine. The tuning I'm unsure of with the allison
 

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Why not find a medium duty Allison thats all mechanical to go with you mechanical engine? No tuning required and easy to find adapter plates that arent custom???
I agree with smoking go to a truck junkyard and pick up a Allison 2000 or bigger and bolt it up no fancy adapters or electrical just make sure the governer in the trans will work with your setup otherwise it won't shift. But just a side note those trans are double the size of an Allison 1000 so be prepared your either going to spend coin or have lots of fabricating to do
 

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I'm looking at the identical dilemma right now. Are the 5 speeds they come with gigantic dimensionally? Could that be used with a divorced t case? My number 1 choice now is a built 4r100, but I tow 15-18000lbs and want it to live. ;)
 

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Discussion Starter #9
There are Allison 1000's or 2000's I was told in the medium duty applications the diffrence is you don't get tap shift an it's always in tow haul an those trans are behind mechanical pumped trucks out there. The model 545 Allison's are mechanical but I'm unsure of how much HP they can stand an I really don't want to butcher my firewall an trans tunnel.
I'm most likely going to go Allison route to avoid adapters for the engine an trans this way I just have to get a controller for it an not a controller an engine adapter.
 

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been there done that, with the bigger allison.. I obtained a 3060 out of a school bus for a good price, but after looking over the tranny's sheer size,weight, and the fact of having a push button shifter, i turned around and sold it.. The 3060 could be had in both 5 and 6spd , with od.. Not many of the allisons have an od option, particulary older more affordable units.. Another option would be to take a 545 allison and add a gearvendor to it for an od.. Finding the stuff to do that could be an issue..
 

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Discussion Starter #11
The more searching I do the more it makes sense to go Allison 1000 route tuning won't be an issue they have adapters an output shafts to mate a ford tcase to them an they have been putting them behind dodge cummins trucks for several years. Only thing I'm unsure of is the pressure plate.
 

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I'm leaning towards spicer 5 speed and a divorced tcase for cost and durability. One of my friends knows of a 4x4 school bus he services and is going to get VINs from it to get the parts list of what's in it.
 

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I'm going stay auto for sure. I would love to do the Allison but not sure how hard it is to tune.
BTS 4R100 and a PCS. Carson Stauffer makes the adaptor stuff you need to mate the 4R100 to the DT360. Look up Pipewhiner's thread on here as he built a SD with a DT360.
 

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I dont recall any of the spicer 5sds having a od ratio.. There were some od 5 spds in the military dueces, but dont recall any others.. Havent done the math, but with 40'' rubber that may not be an issue for you anyway..
 

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I dont recall any of the spicer 5sds having a od ratio.. There were some od 5 spds in the military dueces, but dont recall any others.. Havent done the math, but with 40'' rubber that may not be an issue for you anyway..
I'm also looking for a spicer 6 + 1, I've had a couple of those in commercial trucks and they are nice transmissions to drive.
 

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Yep, the little 6+1's are nice trannie's.. Not the toughest, but a good unit, with great ratio's.. I have a rebuilt unit in my shop, just waiting to go behind my dt360 conversion..
 

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Yep, the little 6+1's are nice trannie's.. Not the toughest, but a good unit, with great ratio's.. I have a rebuilt unit in my shop, just waiting to go behind my dt360 conversion..
The more think about the work involved making a tcase work, changing drive shaft lengths, it might be just worth it to go zf6 and buy the adapters.
 
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