Neutral position on speedometer on dodge t110

[serge]

"IN FINE" I think that the explainations of ROB are right and the speedometer owns differents meshs (gear) . Inside the speedometer one group of mesh would be engaged when the truck is in high speed and the other group when the truck is in low speed.

Unfortunaly the truck of my friend is in BELGIUM and the pics showed at the begin of these thread had been shoted on and other truck which original speedometer has disapeared.

I will ask other information about the speedometer to my friend.

MLU forum is a wonderfull mean to understand what the old mechanics knew

Thank to all

[Grant Bowker]

Looking at the page Serge posted in the first message. it looks like the adapter is inline (possibly threaded to the input of the speedometer) rather than inside the speedometer.

Perhaps my first attempt at explaining what I though was designed here was not clear. I agree the information for the speedometer is taken from the rear of the transmission. The speedometer drive gear is clearly shown at the rear of the transmission in the maintenance manual. With the two speed axle being between the point that the speedometer gets its information and the tires, it is possible to have two different road speeds for one indicated speed. To correct for this the speedometer adapter would have two ratios (probably direct and 1.391:1 so that there is only one set of gears involved), different from each other by the same ratio as the two ratios in the axle.