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Mod | | | Forums66 Topics128,125 Posts1,056,337 Members48,440 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2006 Posts: 677 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 677 | I got a question about my work truck its a 1992 GMC Sierra 1500 with a 4.3 and Im pretty sure its got a T5 Manual trans and Im wanting to change out the gear oil, I've been asking around on what weight oil I should use, I've been told a few from 75W90 gear lube to 30 weight motor oil ??
Any idea on what would be the correct gear oil to use ? I live in Vegas so it gets hot here 110+ but also drops down to the low 40's in the winter.
Todd
Some people are like Slinkies, Their not really good for nothing... But they still bring a smile to your face when you push them down the stairs. 1951 3100 350 TBI Gallery Toddzilla... "$old" | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | certainly not motor oil .... might call yer local GM dealer and ask for their recommendation for the local conditions if you don't have a manual  Bill | | | | | Joined: Sep 2011 Posts: 1,456 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,456 | It's not a T5, should be a HM290 (5LM60, later called NV3500), 2 piece alluminum case, bell housing part of front case half. Takes 2 qrts of 12345349 synchromesh transmission fluid.
Could also have optional NV4500 (cast iron case, seperate alluminum bell housing), uses 4 qrts 12346190 or castrol syntorq fluid.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Nov 2006 Posts: 677 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 677 | Thanks ! I wasn't sure on the trans, that helps me a lot.
Todd
Some people are like Slinkies, Their not really good for nothing... But they still bring a smile to your face when you push them down the stairs. 1951 3100 350 TBI Gallery Toddzilla... "$old" | | |
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