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**hatzie** · 09-22-2018, 03:25 PM

I usually replace the driveshaft bushing and seal in the end of the tailshaft housing while I have em off. It goes without saying theere's probably a bunch of crud sitting on top that you don't want falling inside the transfer case. The drive gear is not difficult to replace if it's knackered. Surprising the driven gear looks like that if it was installed...

BTW the NP 203 takes 30W non detergent motor oil. Lots of folks fill em with ATF or gear oil but the original fill was 30W non detergent. The older New Process cases are odd ducks. My NP201 in the 67 Dodge takes 50W non detergent motor oil. I run 75W90 Synthetic in the NP205 in the 72 F250... same as the axles in everything I own that has axles.

09-22-2018, 03:25 PM	#9
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: speedometer reducer/gear question I usually replace the driveshaft bushing and seal in the end of the tailshaft housing while I have em off. It goes without saying theere's probably a bunch of crud sitting on top that you don't want falling inside the transfer case. The drive gear is not difficult to replace if it's knackered. Surprising the driven gear looks like that if it was installed... BTW the NP 203 takes 30W non detergent motor oil. Lots of folks fill em with ATF or gear oil but the original fill was 30W non detergent. The older New Process cases are odd ducks. My NP201 in the 67 Dodge takes 50W non detergent motor oil. I run 75W90 Synthetic in the NP205 in the 72 F250... same as the axles in everything I own that has axles. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 09-22-2018 at 03:39 PM.