Manual to Auto swapÂ…

[epfatboy]

I’m starting to plan an update to a 1986 ish K10 and was hoping to get some feedback and options.

The current config is a well worn JY Gen3 5.3 with a SM465/NP208 combo(sachs 1050 with oe 11”.. seemed to hold up okay). The gear ratio is 3.08 on 33” tires. It sees occasional fire roads, nothing hard on the driveline.

I have a rebuilt 2005 Gen3 4.8 and a 2WD 4L80e. I also have a few P59 ecu’s laying around and will source the appropriate harness.

Questions:
Is there a difference between the NP208 I have or using a NP241c?
VSS if I use the 2wd tranny as is, can I use the vss from the tranny or is this the reason to use a NP241c w/vss?
OK, should I source a 4wd 4L80e, gonna go thru the 2wd tranny anyway and I’m sure I can core out to a 4wd unit.
Can I reuse my case xmember, not afraid of a few mods and moving.. or am I just better off buying?
Anything else major in this general area? I’ll be using a Dakota Digital dash and will get speed from the ecu.

I assume the t-case is gonna need to move back and I will need new shafts.

And I might change the 3.08Â’s to 3.73Â’s but that is gonna be last.

Any help is appreciated.