transssions

[punisher1130]

Does anyone have any info on how well the Allison transmissions work overland? I have one in my work truck and it takes every bit of abuse I throw at it without skipping a beat and has a feature I like on it and gave me the crazy idea of getting a 4x4 version of one for my truck instead of looking for a 727. Any one have any info or experience with these transmissions off road?

 

[quickfarms]

I like my mt643 and mt653

 

[punisher1130]

which one is that? the flat bed truck I drive for work has the 4th gen 1000 I think, all I know for sure is its definitely a 6speed auto.

 

[OverlandRockwell]

No experience with them offroading, but some fun tidbits from the diesel drag/puller world about both 727 family and the Allison 1000. It's not offroading but they put their trucks through a lot more abuse than we do...

One of the fastest Duramaxes in the world got tired of killing multiple built Allisons and went to a 48RE (727 with O/D basically) FYI. With that being said the Allison 1000 is nice but a 727 can be built for a lot less money to take a lot more abuse without any electronic wizardry.

Now if you are talking about a 5 ton MT653, that would be sweet!!!! Just plan on cutting floorboards and a Sae 2 bellhousing for your engine.

 

[punisher1130]

I didn't know the 727 would survive behind a diesel. Main reason I was thinking about using the 4th gen Allison 1000 because its a 6 speed which would help with mpg and range off road ( at least I think it would anyway) and it has 2 drive mods, d6 for normal driving and d4 with hauling ( at least that's how the flat bed for work is set up) , thought maybe working the d4 in the computer for off road use, at lease that's the idea anyway, not really sure if its possible to do that. As for the 727, I thought about that because based on the research I did on dodge transmissions said that the 727 was dodge's answer to chevy's 700r4 at being bullet proof, and knowing my luck I need something bullet proof like that lol.

 

[UrbanCummin]

The Allison in the GM pickups is nothing special (lots of issues with the 4/5 shift on the 5 speeds once you have added some hp). Generally speaking they are better then the dodge automatics and comparable to ford last few autos (5R110, 6R140). When upgraded then can handle a ton of power/abuse but then again so can the dodge and ford autos. Like overland has mentioned a few people have swapped to a 47/48 because they can be just as strong as an Allison with much less rotating mass (Allison are a huge pickup tranny).

If it were my call I would build a nice 47RH because it has no computer controls.

 

[OverlandRockwell]

The 727 can be fitted with a lot of the guts from the 48RE (which was rated for 800 ft/lbs). The 47/48 series have funky cummins/V10 bellhousing and nobody makes a separate bellhousing or case for them.

 

[punisher1130]

Yeah I have heard about the limp mode issues the 5 speeds had, was hoping the 4th gen 6 speeds would have fixed that. I don't really intend on building my 5.2 magnum to have a mass amount of power since its a daily and being building into a overland rig, if I had to guess I would be in the 300 range for hp and torque nothing real serious just enough for me to go out and get away for a weekend and come back. At least not till I have a 2nd vehicle lol. But by the sounds of things, the 727 would be my best bet unless I stick with my stock tranny and try to improve it, if possible.

 

[UrbanCummin]

Ya with that kind of power output I would not worry about having to build a tranny to handle extreme abuse. Even though I have owned built C6 and 727 3 speed trans I would never go back to them after having o/d. The highway mileage improvement is crazy, and no V8 engine wants to be doing 3000rpm cruising down the highway. Oh and from my experience the 6speed allisons are better then the 5 speeds but still cant handle big hp in the 4/5 and 5/6 shifts in stock form very well.

 

[comptiger5000]

If you're using a 5.2 magnum, just stick with one of the Chrysler 4 speeds. The 44re (basically a 904 with OD) or 46re (727 with OD) will already be strong enough (and they can be built much stronger than you need, if desired) and they bolt right up to the motor. My unrebuilt 46re is about to click over 194k miles, 75k of that behind a heads/cam 5.9 magnum (stock 5.9 magnum before that). I threw a shift kit in the valve body when I did the heads / cam, haven't touched it beyond fluid changes and such since. Still shifts perfectly, will bark the tires into 2nd at WOT, no signs of giving up any time soon.

 

[punisher1130]

Ok thanks for the info urbancummin and comptiger5000, I'm not that familiar with Allison transmissions outside of the flatbed I use for work and the abuse I put it through on the clock. As for my dodge, the only thing I know about dodges is how to make a bad *** street monster. So for my needs my best bet is to stay with what I have from factory and build from there. Now just need to figure out how to get my lil monster to make better then 15.5mpg without it dragging *** lol.