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Old May 5, 2023 | 03:27 PM
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NP203 question

1975 F250 4x4 with FE360 and C6 transmission.
Truck is bone stock and was purchased from the original owner about 8 years ago.
Truck came new with full time 4WD so its the NP203 transfer case.
Original owner had the part time conversion kit installed making it part time 4WD with aftermarket(non-Ford) locking hubs.

Decided I want to do some basic maintenance on the transfer case- What is the correct lube/fluid to be using?
I've read 80-90W oil, straight 30W oil and transmission fluid........
Also I see no obvious drain /fill plug.
Thanks in advance.
Tbruz
 
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Old May 5, 2023 | 04:21 PM
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from 1976 shop manual;


 
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