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BUSY BOLTERS Are you one?  The Shop Area
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Jul 21st, 2025 | | | | Joined: Sep 2019 Posts: 204 'Bolter | | 'Bolter Joined: Sep 2019 Posts: 204 | 1955 Chevy 6400 first. I replaced the vacuum hoses from the axle shifter mounted on the frame in front which is controlled by a knob on the dash. The only problem is that I can't remember which is the high and low connection on the axle unit. Is the top inlet high gear? | | | | | Joined: Mar 2010 Posts: 1,659 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,659 | I don't know if this is any help. http://chevy.oldcarmanualproject.com/parts/1929_54/362.htmBeing I'm not up on how 2-speed works, I would just connect them and try? If wrong swap hoses?
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
| | | | | Joined: Mar 2004 Posts: 6,189 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,189 | I would just connect them and try? If wrong swap hoses? That's what I would do...  Mike B  | | | | | Joined: Sep 2018 Posts: 86 'Bolter | | 'Bolter Joined: Sep 2018 Posts: 86 | The top half of the diaphragm pulls up on the diff shift mechanism for high speed.
The bottom half of the diaphragm pulls the diff shift mechanism back down for low speed.
This explains why people say to put the diff back in low speed when parked. Because if the shift rod drops out of high speed due to gravity and bumping around when loading the truck it could end up in neutral and you might find your truck at the bottom of a hill. | | |
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