Cummins swap

[ecfuerst]

Hey guys,
I have search many a conversation on here and have just confused myself even more. I need some advice from some elders. Because of my work I can't always check tags and find out exactly the equipment I have.
Right now my truck is a 1967 W300 318 Poly 4speed with divorced transfer case. Front Dana 60 and a Dana 70 out back.

First question- Which transmission is most likely in the truck
Second- Which transfer case?

I am going to do a cummins swap and have been searching far and wide for a donor truck. I am fairly certain that I will be going with a 1st Gen manual
what are the thoughts on an intercooled vs. non-intercooled? Am I correct in saying that a 4bt is underpowered? I know they can be turned up but I am trying to stay close to stock.The main week point in my automotive game is body work. I don't want to dog house the cab if I don't have to, but it's not a deal breaker.

Can I use a 2wd transmission since the T-case is divorced?
What have guys done for the drive shafts? Custom

I will be swapping the axles for a 1st Gen for the higher hwy gears, better brakes and better wheel selection (I have the 6x7.25 bolt pattern) . Stockton wheels are not an option unless you're donating them to me. This will be my almost everyday driver and the fuel economy will be considered

Thanks for the help. sorry if I sould all over the place but I am just getting started and its all on the table right now.

[PowerMan]

You should have Dana 70's (6 lug) front and rear unless the front was swapped out for a 60 which would be an 8 lug axle.
You probably have the NP435 4 speed manual with granny gear first.
The transfer case would be a NP201 which is strong but if you plan on running a lot power then I would recommend upgrading to a NP205 transmission which is even stronger.
As for the cummins the 1st gen (thru '93) is the cheaper way to go. Some are intercooled which allow for more power while some of the earlier cummins are not intercooled. You can find the first gen engines easier and cheaper than those in the '94-'98.5 Dodge Cummins trucks due to the value of the injection pump.
Most people have automatics behind the cummins which to me doesn't make any sense but I am partial to manual transmissions. Another transmisson option that you may find is the Getrag 5 speed manual which are decent transmissions. Many people also convert to the NV4500 5 speed manual which is a stronger transmission. These transmissions were used in '94 - '02 Dodge trucks with cummins. You may also find these transmissions in early '90's 3/4 and 1 ton GM trucks (I can't quite remember exactly what years). If you run the original divorced transfer case but want a 5 speed manual, it has been recommended to use the 2 wheel drive GM tailhousing which is shorter than the 2 wheel drive Dodge NV4500 tailhousing. (The Dodge 4 wheel drive trucks with NV4500's were mated to the transfer case). I believe you have to change the input shaft in the GM NV4500 to the input shaft from the Dodge NV4500 due to the length.
I am currently building a '65 W200 crew cab with a '96 12 valve Cummins and NV4500 and mated transfer case. This engine is intercooled and has the P7100 injection pump (1994-1998.5) which is a little more desired than the v series pump on the first gen trucks. I'm not knocking the first gens at all but you can get a lot more power out of the p-pumps than the v-pumps.

[ecfuerst]

PowerMan, Are you dog housing your firewall? It's my undersatnding that it should be done if you are planning on the intercooler. It may be a Dana 70. Large knukle with 6x7.25 bolt pattern. 4.88

[Kaegi]

PowerMan, Are you dog housing your firewall? It's my undersatnding that it should be done if you are planning on the intercooler. It may be a Dana 70. Large knukle with 6x7.25 bolt pattern. 4.88

Dodge never ran a Spicer 60 up front back then. only the 70. I have never converted but seen it done both ways, with and without dog house. I would not do dog house if I were to do it. I would just have a custom intercooler built that fits infront of the radiator

[PowerMan]

I am dog housing the fire wall. It is almost necessary to to this to fit the intercooler. The trucks that I have seen that haven't cut the firewall are all non-intercooled. Just not enough space in the engine compartment.

[petespowerwagons]

sorry to change the subject. but i am also just gettin started on a project. I have a truck, a 67 dodge 1/2 ton 2wd camper special (46000 original miles) (has 318 and 4 speed manual) that i'd like to put the cab on my 91 dodge 3/4 ton with a cummins 5 speed manual jetrag. Seems to me its alot simpler to put the cab on the newer frame with the motor and drive train already in it. Also way easier to get parts! can anybody tell me if i'm completely thinkin wrong or if this is the best way to go? And if so has anyone done this and know what my biggest battle is gonna be? i also have 68 and 71 power wagons, but the cabs would take alot more to restore then my 67. thanks

[ecfuerst]

I think I saw a thread on here in which someone did just that. I though about it but I am concerned about the wheelbase. I plan on using many late model parts for availability and stopping power.