Speedometer reducer

Who was looking for one? Came across this one this weekend. $50 plus the ride.

 

In line for a minute. What exactly is the application? I've seen some 4 speed cars with them and my 350-4 speed did not have one. Have an M20 and 455 4 speed set up going in a car someday. Would I need it?

 

Hello In line as well.

 

if it is for a four speed car i will jump in line

 

I believe it was for a four speed car. Can anyone run the numbers in the picture?

 

The ones on the 4-speeds are a 90 degree like this one. They were NOT used for 3:42,but were used for 3:64 and 3:91.

 

I think these were dealer add ons to fix speedometers that were off. They were available in a bunch of different ratios to fine tune the speedo. I would not doubt they were factory installed on specific ratios. Much easier to add this in line than come up with a new set of gears in the trans.

 

Ok, thanks. I don't need it then.. I am out. Thanks

 

Hello,
Based on the new information I will pass.
Thank you.

 

I had a few 72 automatic cars that had that straight adapter. TH400 cars,if that helps.
One of the main reasons that the 4-speed adapter was a 90 was the issue with the speedo cable. The 4-speed cars already used a longer 68” speedo cable,due to the speedo port being located on the passenger side. If you extended it straight out,you are getting even further away and still need to have a slow bend in the cable.

 

I know that my 70 455 4 speed had this straight type of adapter on it.

 

That would be a first for me. My 455 4-speed 3:64 has the 90 and every other 70-72 4-speed car that didn’t have a 3:42 had a 90. Is the one on your car the same numbers and calibration as the one you have for sale? I had a 72 455/TH400 that had a straight one,but made no sense because it should not have needed one.

 

I don't have that car to check anymore. But could get ahold of the owner.