Wanting to swap my 10 speed for a 13

The 4:11s are the killer, a 10 speed with OD and a 13 speed with OD will be geared about the same in the OD, not enough of a difference to help.

 

Most highway trucks are in the 3.42-3.55 range.

 

Use this to help figure it out, http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_062746.swf

 

The real trick to make it work is use the link Old Man posted and run a tall rear gear( lower number) with a direct top gear.

 

Let's say I want to swap my trany from 10 to 13 gear. Is the 13 speed trany longer than 10 speed. If yes, should I change the driveshaft, for a shorter one?

 

Yes the 13 is longer than the 10. You will need to change the shifter on top. The install is the same the existing clutch will work but with the age of the truck it should at least be dropped and inspected. A new pilot bearing in the flywheel is a must. And with that down check your rear main seal. Route the air lines according to Eaton for your shifter/splitter. Measure for your driveshaft and head down with your old one to the drive line shop and have them cut it down. Install new u joints check your carrier bearing out too. If the new trans has a cooler mount up the cooler lines. Get a 13 with forced lube or what we call halo oil system. You will also need a bell housing as the fro won't work on a rtlo trans. When it is off you will see the halo on the front of the case and the bell housing has a channel to match. The only sticky area I am unsure of is the speed sensor if the one from the fro will fit in an rtlo. But the dealer should be able to figure that out which one will work

 

Thank you. Appreciate it.