Questions on a 2000 Ram 1500 4X4

I recently purchased a 2000 Ram 1500 4X4. I have a few questions about it if the group could answer please.. It has a bit of aftermarket stuff put on it including bigger tires than
stock (315/75R16). It appears as though the previous owner didn't have the speedo recalibrated because at freeway speeds, I'm going 12-15 mph faster than what the speedo says. First question - is there any way to recalibrate it without spending the $400 for a hypertech (or similar) device which I'll basically only use that once because I don't trailer at all? Second, the speedo being off would also throw off the odometer, would it not? Secondly, I think the transfer case is leaking fluid. It's got the 231D. Is there a quick fix for this or where is a good place to get a replacement?
Thanks for any help, Socalstaff
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Your dealer can re-program the PCM for the new number of revolutions per mile (you'll either have to figure that out, or get it from the tire manufacturer - but I'm pretty sure those tires are 601revs/mile)
Alternatively, there are electronic recalibration boxes that you can wire in between your ABS computer and PCM, that will correct the speed. These will run between $150 and $200. A dealer should only charge $75 or so to recalibrate the PCM.

It would.

Thirdly, but who's counting :)

Depends on where it's leaking from. Common points are the input shaft seal (between the transmission and transfer case - requires removing the transfer case to replace), the output shaft seal (where the driveshaft connects - easy to replace, just have to remove driveshaft), or the drain/fill plugs (easiest to fix - just tighten with a 3/8" allen wrench). Of course, it could be leaking from the case itself (where the two halves join together), but that's much less common.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.