Is there a way to get the speedo re-calibrated after putting in new gears for a 96 Ram? Thanks!

 

What ratio ? You can change the plastic gear on the speed sensor ! I put a 35 on mine !

 

Absolutely. You will need to change the speedo pinion gear to one with the right tooth count for the size gear and overall wheel/tire diameter you are running. For an example calculator, see this page:

http://www.mymopar.com/speedometer.htm

 

I went to 4.56 front and back. I'm running 35's so it looks like I'm off around 10 mph. How hard is this to change? Is this something I can do or should I have a shop do it? Thanks for the help.

 

I don't see my tire height on that chart. Is there another one for bigger tires?

 

It's real easy to swap if you have a 46RH transmission with a speedo cable. My truck is an early model and has a 46RH trans. See this video for an example of the process:

 

Try this chart here:

https://transmissioncenter.net/shop/...dometer-gears/

 

Trucks up to 97 have the gear driven VSS in the final output shaft, be it trans, or t-case. That particular part went away for 98.

Changing the gear is cake. Take you about 15 minutes tops.

 

Just inspect the o-ring seal too. Put some o-ring lube on it, before you put it back in, so you don't tear it.


And...

In the above pic, you will notice a notch. That lines up for different gear sizes. IIRC, they are shown on the gear holder thingey. If you put it in wrong, for the rise gear you have, you will either have no output or your gear will bind. It really is a no-brainier but just thought I'd mention it.

 

Thanks for the input guys. I will probably end up letting the shop that rebuilds the tranny do it for me. I'm guessing they will know how to get the proper size with the gears and tires. Anyone know what it is with 4.56 gears and 35" tires?