2 speed rear speedometer


The old and reliable.

Pile of Parts
Pile of Parts

Posts: 49

Joined: Fri Jul 17, 2015 4:12 pm

Post Sat Oct 30, 2021 3:54 pm

2 speed rear speedometer

Could someone explain the purpose of what I believe is a 2 speed rear end adapter on the backside of the speedometer? Also where the small rubber hose connectected to the adapter goes? I pulled this off many years ago and cannot remember. Thanks

Golden Jubilee
Golden Jubilee

Posts: 5170

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Sat Oct 30, 2021 5:51 pm

Re: 2 speed rear speedometer

It adjust the drive to the speedo so it reads correctly in both ratios. The vacuum line goes to the vacuum valve (under the hood, on the firewall right side) where it gets vacuum in high range to pull the lever and speed up the drive to the speedo.
Without the adaptor, it would only read correct in low.

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