5 speed or 6 speed
 

Hey guys I just bought a 95 cummins stick with an auto trans. Looking for some input. Is it worth it to put a six speed and in? Really been thinking about it!
Thanks logan

Stock not stick

For the sheer hassle that is an nv5600 swap, I wouldn't bother. An nv4500 bolts right in, has a similar low range, and a similar OD.

The extra gear is actually placed between 3rd and 4th gear. The nv4500 has a fairly wide gap between 3rd and 4th, it something like a 35% rpm drop.

To solve this, NVG put a gear between the two in the 5600.

For what you get, and since the 4500 is such a widely known quantity, I'd just bolt in a 4500.

Do you know about the load difference? Pulling hay and equipment? Still the nv 4500?
Thanks!!!!

The nv4500 has a gvw of 19000 pounds I believe. Which is in excess of what the gvw of the truck and hauling limits are. A 1 ton from the 90s was rated to tow perhaps 12000 pounds. And the truck weighs 7 as it is.

The 6 speeds had a higher gvw yes, but you are still limited to the rest of the truck, and what it was certified to pull.

As for operation under load, there's not much difference. The 4500 is a strong unit if serviced correctly.

Thanks for the info slim!!

With the correct oil, external coolers, and 25k oil changes they last a long time. In my experience.

in a truck with 410s , a 6 speed is near worthless .. now with 355s and pulling 15k + its quite handy to have closer splits on gears ..