Speedo question
Posted: Fri Mar 24, 2017 1:45 pm
I just swapped out my transfer case for an NOS one. The transfer case was technically meant for an M715. I had to change out the three flanges, but my understanding is that everything else is the same.
Before the swap my speedometer was showing speeds too slow by about 10%, and now its showing too fast by about 20-30%. I checked it before and after using an app on my cell phone. (I happened to check it some time ago when I suspected it of running slow.)
Why did this occur? The M37 has an axle ration of 5.83:1, the M715 is 5.87:1 and both take the same size tires.
The NOS transfer case did not come with a speedo pinion drive or retaining nut, so I bought NOS M37 ones. They came with the speedo drive gear, but since that's internal to the transfer case I didn't use it.
It's a new Speedometer and cable with only about 600 miles on them.
Thanks in advance.
Before the swap my speedometer was showing speeds too slow by about 10%, and now its showing too fast by about 20-30%. I checked it before and after using an app on my cell phone. (I happened to check it some time ago when I suspected it of running slow.)
Why did this occur? The M37 has an axle ration of 5.83:1, the M715 is 5.87:1 and both take the same size tires.
The NOS transfer case did not come with a speedo pinion drive or retaining nut, so I bought NOS M37 ones. They came with the speedo drive gear, but since that's internal to the transfer case I didn't use it.
It's a new Speedometer and cable with only about 600 miles on them.
Thanks in advance.