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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!
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#74375 03/07/2007 3:38 AM | Joined: Jan 2007 Posts: 172 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 172 | Reading my users manual, it says that the trans (4speed with granny gear) can be filled with 90 weight or mineral oil.
But it says not to mix them.
So what do you all use? And where is my filler hole? I can see the drain hole from under the truck, but not the filler hole.
(This is next on the list after refilling the rear axle with new stuff.)
1965 Chevy C-30 1-Ton "Work like you don't need the money. Love like you've never been hurt. Dance like nobody's watching." | | |
#74376 03/07/2007 3:52 AM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The filler is about 1/2 way up on the right side of the case. I'm personally running an approx. 70/30 mix of Lucas synthetic gear oil/Lucas oil stabilizer. My tranny shifts real slick now.
Bill Burmeister
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#74377 03/07/2007 5:05 AM | Joined: Dec 2006 Posts: 184 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 184 | You ask a good question. In the 15 years of owning mine, I've never changed it. Guess I should get around to it. I'll probably go with a synthetic 90 SAE when I do get to it. I run synthetic in my '98 and it's great since I sometimes get too involved in other things to remember to get oil changed out every 3000. | | |
#74378 03/24/2007 8:34 AM | Joined: Feb 2001 Posts: 1,096 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 1,096 | I've been running Castrol GP 50 in the original manual tran for about 8 years now , it shifts smoother in winter , no noticable change in summer. | | |
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