rotating np241 ?

[BCronk]

I am wanting to upgrade my transmission in my 72 so I have od & can bomb my engine. I am trying to figure out what all my options are. I would like to use a 47re/rh or allison 1000. here is my problem I have a passenger side drop on my t case, newer chevys & dodges drop on the driver side. Is it possible to just clock/rotate the t case (np241) to be on the passenger side? I looked at my dodge t case and it looks like the mounting flange on the t case has a symetrical bolt circle so it might bolt up. I am curently runnning a th350 with the cummins/chevy flywheel housing & flex plate. will the allison bolt up to this & how would I control the transmission. Also is it possible to bolt a np205 to the allison? Thanks for any help.

 

[pro99]

The 241 can't be done that way because the oil pump pick up would be at the top of the t-case and starve it. The bolt pattern is different too it looks like you could just turn it but can't the holes are off just a little. But never say never I guess you could make a new oil feed pick up tube and long gate the holes in the housing plus cap off the breather tube and drill new hole?

 

[DKarvwnaris]

If you want to go with the 241, you can use the dodge front half of a 241 DHD transfer case and combine it with the rear half of a GM 241 transfer case to change the front output side. The 241 in the later 80's GM straight axle trucks was opposite of the IFS bodied trucks that started in 88 for the 1/2 tonner's. My 90 suburban still has the older model transfer case in it. Off the top of my head, you can find the neccesary transfer case in models up to the end of 91 in the suburbans and crew cab 1 ton GM trucks.

I was talking to Kenny at autoworld the other day about this as a solution for my suburban instead of the dodge 205 transfer case, he knows a shop doing it locally in his area. (phone:406 727 8915) It will cost you some money, but you'll end up with a new rebuilt transfer case once you have one built, so in my mind, if that's what you want, its worth it. I'd rather spend the money once than buy a used unit and have it fall apart shortly after installation, which in this case isn't possible in the first place due to the output side of the stocker's.

Have you thought about using a dodge 205 transfer case from a 89 to 93 diesel? An nv-4500 4WD transmission will bolt directly up to this transfer case with just a adapter coupler for the output and input shafts, it is a drop in, drop out installation, no skills needed beyond basic mechanical abilities and tools. If you can change a clutch and pull a transmission, you can do this, best part is, it will require very little specialty parts or custom mods to get it done. This makes regular maintenace and parts replacement easy, a BIG advantage in the long run.

 

[BCronk]

Thanks for the info guys. Any answers to my other questions? Will an allison 1000 bolt to my current set up. If some one could give me the bolt circle dia on the torque convertor, the dia of the pilot hub thing on the front of the convertor I could probably figure out if it would bolt up. Oh one other thing how far does the torque convertor stick out past the bell housing. And one other thing what size mounting bolts does it use? Wow this is getting complicated. Maybe this would be easier, will an allison 1000 bolt up where a th350 once was?

 

[DKarvwnaris]

For the cost of buying all the parts to install an allison auto, and going through the headache of putting it in, you could go with a built transmission from the aftermarket diesel shops that is original replacement for your truck. For a bulletproof overdrive, I would look into the gear vendors, I have seen these units survive several rolls of the odometers with no compaints. Most of the guys I know running them are far exceeding the limits of their trucks weight and towing limits on a daily basis.

I am not a fan Allison's and have not considered them repowers so far or future projects. The rebuild cost is very high and in the end, its still an automatic transmission. Sorry I can't help you on the fitment info, its just not my line of interest If I wanted the higher rebuild costs associated with medium duty truck parts, I'd buy one, not put the stuff in my economical pickup.

Besides, if I want braggin' rights, my Volvo will out pull anything I have ever seen in a pickup truck or MDT chassis vehicle. That's what a 12. 7 litre series 60 detroit engine is made for though

 

[BCronk]

I guess I will probably ditch the allison idea. I just wanted to be able to use my ctd to gm flywheel housing, that stuff wasnt cheep. I guess the whole repower thing wasnt cheep though, I have all my recipts but will never add them up. I told my wife It would pay for its self in fuel savings, she wised up to that real quick. :-{} At least she fell for it long enough to let me get started on the project, and past the point of no return. What type of built transmission are you referring to DKarvwnaris? GM or DC I am guessing DC? The engine is tilted slightly and the transmission is level with my current set up. Will it hurt to have the auto transmission tilted also if I go with the DC transmission? Thanks again

 

[DKarvwnaris]

I guess I will probably ditch the allison idea. I just wanted to be able to use my ctd to gm flywheel housing, that stuff wasnt cheep. I guess the whole repower thing wasnt cheep though, I have all my recipts but will never add them up. I told my wife It would pay for its self in fuel savings, she wised up to that real quick. :-{} At least she fell for it long enough to let me get started on the project, and past the point of no return. What type of built transmission are you referring to DKarvwnaris? GM or DC I am guessing DC? The engine is tilted slightly and the transmission is level with my current set up. Will it hurt to have the auto transmission tilted also if I go with the DC transmission? Thanks again

A Dodge transmission is the only thing that will hold up to the torque of the cummins in even stock form. GM has nothing that will take it very long

The GM adapters are not very suitable for a repower with an auto due to the tilted connections you already asked about. You'd be better off with all dodge parts for the connection in the first place, it allows for a "no brainer" connection and was designed for the 5. 9 specifically.

There are lot's of off roaders who want to use the GM adapters due to its opposite side starter position, you can resell them easy enough. Every 4bt engine I've bought so far has had them hanging off the back of it though. The GM flywheel for the 4bt is more valuable than the flexplate setup.



A dodge 46 re or similar mid 90's transmission will give you plenty of strength if built up.