Dumb question about t-case...

[dieselcruiserhead]

I am researching a project to install a ISB 170 to NV5600 to Dana 300 using the 29 spline adapter kit that JBconversions sells designed to bolt behind a 29 spine Dodge HD / diesel NV4500. So I am assuming this t-case would also bolt behind the NV5600 as well if the NV4500 and NV5600 share the same tailhousing pattern in Dodge applications.



I am assuming that the later Gen 3 NV5600 speeds use the same 29 spline output as the gen 2 cummins? Is the t-case a NP241 (or some sort of variant) just like in earlier Dodges? So just checking for those who may have done the swap...









Also, most of these ISB's come with a SAE #3 industrial bellhousing, I think I am going to get the starter and back plate off the ISB 5. 9 to bolt to the back of the ISB 3. 9L. I have heard of guys using the 6 cyl flywheels with the 4 cyls in B series applications but not with the ISB. That would be a neat setup then I could use an OEM Dodge clutch as well. I wonder if there is anything wrong with using a 6 cyl flywheel on a 4 cyl or do you think the balance would be off?









Also, do the NV5600 use an internal hydraulic clutch slave or external? And I imagine that clutch takes a significant quantity of juice to move? Any idea what the diameter of the clutch master cyl is?





Thanks, dieselcruiserhead in Utah...

 

[rbattelle]

I am assuming that the later Gen 3 NV5600 speeds use the same 29 spline output as the gen 2 cummins? Is the t-case a NP241 (or some sort of variant) just like in earlier Dodges? So just checking for those who may have done the swap...

The 3rd-gen transfer case is the NV271, which is a derivative of the NV241. I'm sorry I don't know if the spline count changed. I know the 271 was "beefed up" a bit to handle more torque.

I have heard of guys using the 6 cyl flywheels with the 4 cyls in B series applications but not with the ISB. That would be a neat setup then I could use an OEM Dodge clutch as well. I wonder if there is anything wrong with using a 6 cyl flywheel on a 4 cyl or do you think the balance would be off?

Other than perhaps being a little heavy for the 3. 9, there'd be nothing wrong with using a ISB 5. 9 flywheel on the 3. 9. There wouldn't be any balance issues, since the flywheel is simply balanced evenly (ie. no counter weights in it at specific locations, otherwise you'd have to index the flywheel when putting it on).

Also, do the NV5600 use an internal hydraulic clutch slave or external? And I imagine that clutch takes a significant quantity of juice to move? Any idea what the diameter of the clutch master cyl is?

The slave cylinder is external, NOT concentric (thank God). I'm sorry I don't know the clutch master cylinder diameter. Note that the 2003-up clutch hydraulic assembly is (apparently) not serviceable and the master and slave assembly must be purchased as a pre-assembled unit. Some of the guys who converted to SBC pressure plates have "upgraded" to a 12v slave/master because it has more strength.



Sounds like a really cool project. Keep us posted...



-Ryan

 

[dieselcruiserhead]

Great thank you. I found out from other sources that it is basically the same spline count and bolt pattern so that answers that I hope it all comes together. Shameless plug - if anyone is interested in my current diesel project it is for sale on ebay. If it sells it will allow me to start the new project...



http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=4638724473

 

[dieselcruiserhead]

Basically a simple way to ask my main question is:



when you upgraded to a 6 speed from a 5, did you have to do anything special to bolt the t case up to the transmission or did it bolt right up like before?