Another option to a T-5 if not needing an OD would be a NP-540 series, just like a 435 but with another gear. The closer ratios make hauling a load work well. They come with many bellhousing bolt patterns including GM, Ford, Dodge, etc. The 14” clutch models have a longer input shaft which is not very useful for our size trucks.
Ed
That's a very interesting option! I think the NP 540 had a OD variant as well.
