Yeah this ^ I know a little bit about axles and stuff. Near all OEM axles step down after the spline for a short distance. The only way to respline in this area is to have it built up with weld first. Check out trader_84 on TM. His TM ad for resplined Hilux axles explains somethings about the axle resplining process. I know T_84 because I'm him and those pics of axles were taken out the back in my shed. I've never done a T series diff but are they the same as a Lite Ace or something? I got one here as well as some F series ones I am trying to unload. I was going to tool up to offer them in shortened form but it seemed too much work for the perceived return, so have just stuck to Hilux, BW78 and 9 Inch diffs. They are all 90 degree included angle stuff. I am not equipped for 60 degree spline cutting and don't intend to be. The other thing you need to watch out for is going to big arsed axles and then having to take too much off the diameter. Near all OEM axles are case hardened meaning its hard on the outside and like butter on the inside. I know how deep the various OEM axles are hardened to, and have examples of each type of axle i cut. I cut cold and stay well within the hard area so there is no need to pay for re-hardening. Putting a smaller diameter spline on a large OEM axle will see you removing all of the hard casing and working within the soft core area necessitating re-hardening. This is expensive and IMHO is hit and miss at best. Cheers.