Noco77gmc4x4
Junior Member
- Joined
- May 7, 2017
- Posts
- 3
- Reaction score
- 0
- Location
- CO
- First Name
- Andrew
- Truck Year
- 1977
- Truck Model
- K1500 sierra classic
- Engine Size
- Small block 400
Thank you very much. That's what I needed to know.
TH350 to 700r4 swap
- Thread starter R8rPhan
- Start date
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Noco77gmc4x4
Junior Member
- Joined
- May 7, 2017
- Posts
- 3
- Reaction score
- 0
- Location
- CO
- First Name
- Andrew
- Truck Year
- 1977
- Truck Model
- K1500 sierra classic
- Engine Size
- Small block 400
How do I identify what transfer case i have? Is there a way to look it up with the vin# or will it directly say "NP203"?
- Joined
- Aug 29, 2010
- Posts
- 47,132
- Reaction score
- 9,331
- Location
- OKC, OK
- First Name
- HotRod
- Truck Year
- 85 K20 LWB
- Truck Model
- Silverado
- Engine Size
- 454 - Turbo 400 - 3.73
If your shifter is Hi Hi Lok Low and Low Lok it's an NP203. I'm fairly certain that is what would have been in 77. If it's not that, then it's a NP205. Since you don't have a manual transmission and it's not a K30, then it should be the NP203. A real heavy bitch, chain driven and a full time 4x4 unit.
