I've got a '50 Dodge with the Gyromatic Trans. It's the M6. Someone was kind enough to share this with me, perhaps this might help you as well. <link rel="File-List" href="file:///C:/DOCUME%7E1/FRANKB%7E1/LOCALS%7E1/Temp/msoclip1/01/clip_filelist.xml"><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:DoNotOptimizeForBrowser/> </w:WordDocument> </xml><![endif]--><style> <!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0in; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:8.5in 11.0in; margin:1.0in 1.25in 1.0in 1.25in; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;} div.Section1 {page:Section1;} --> </style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext="edit" spidmax="1026"/> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext="edit"> <o:idmap v:ext="edit" data="1"/> </o:shapelayout></xml><![endif]-->(1) Disconnect the transmission wiring completely from the spark coil where it gets its power. The transmission will upshift with the wiring disconnected, but you'll have to put the clutch in to let it down shift after you come back down to a stop. If it shifts like it should with the wiring disconnected, then you know you have a wiring problem. (2) double-, triple, and quadruple-check your idle speed. If you're using a little tachometer, it might be lying to you. Set the tach aside, and turn the idle down as far as it'll go and still run -- just fast enough that it'll idle in gear without stalling. I'm mean really low. See if that makes a difference. There should not be a lot of oil in the governor switch. I don't know what kind of seal they have in them, and you'd have to take one completely apart to find out. It's also possible the transmission is over-full. It should only be filled to the level of the filler plug, but there's something that can fool you. There filler plug is on the passenger's side f the gearbox about four inches above the drain plug. There's a second plug a couple of inches higher, and you don't want to make the mistake of thinking that's the filler plug because that would be too full. <!--[if !supportLineBreakNewLine]--> <!--[endif]--> Gyro Tranmission.pdf