Speedo gear help for bigger tires

[Prestin_xj]

Speedo help. The truck will have 37’s soon. Axles have 4.56 gears. What Speedo gear do I need to order for the tcase to keep the speed right? Buying the correct gear will keep the odometer accurate also, correct? Also don’t know if I need the short or long gear. 

Just did the 2wd ba10 to 4wd ax15 from a 96’ xj. The Speedo parts that go into the trans/tcase are different between the 2wd and 4wd transmissions. I won’t be able to use the cable driven Speedo off of my 2wd trans (it’s much bigger) so I’m going to take the Speedo mechanism off of my 87’ 4wd mj tcase. 

[Pete M]

does this help? 

 

 

[Prestin_xj]

@Pete M yes! Looks like a 36 tooth should be close enough. Just don’t know if I need a short or long one

[Pete M]

I was able to swap the shafts from long to short.