ok I hava a 99 ram 1500 5.9 with a 3" lift 285 tires a cai, sct tunner, glasspack muffler, and a hughes engine plenum, with the tires at highway speed feels kinda sluggish instead of re gearing how about adding performance!! My question is What should be next????

 

Regear

 

If you're still on a stock Y-pipe/Cat, that'll be restricting things.
Are you running the higher Oct tune?

 

You can spend a couple thousand on performance stuff and gain say 50HP out of your engine. You will feel it some but if you really want to feel pep and pickup when you step on the throttle you need to regear. You don't have listed where you're from so can't comment on that but if you have hills and mountain passes to drive you'd be amazed what lower gears will feel like.


A test you can do that doesn't cost you any money is this:
If you have a stick don't drive it in 5th only 4th and if it is an auto disable overdrive. This is what it could feel like if you were to regear.

 

Keeping it down a gear is about what all the mods I have feel like, so a re-gear is going to be cheaper, and more beneficial if you're not on the flat.

 

hmmm well I guess I will re gear would 4.10 be at stock performance with the 285/75/16?

 

Check the tag on the differential cover to determine what gears are currently installed. If they are 3.55, going to 4.10 will make a nice difference with those 33" tires in mixed driving (around town and highway). If you want maximum pull from stoplight to stoplight or primarily use your truck for mud runs, perhaps you may want to consider installing 4.56 gears. Is this truck a 4x4? If so, the same ratio gear sets need to be in the front and rear differentials..

 

ya its a 4x4 . I do want good pull but I want good hwy driving aswell. and has anyone done a write up on re-gearing front and back cant find one?

 

Regearing is not an exercise to be undertaken lightly. The gears MUST be done RIGHT, or you will smoke 'em in short order. This is a rather precision install, so, if you haven't done it before, see if you can find someone that has to help you. Otherwise, you would be better off paying the labor to have someone else do it.

That said, 4.56 gears bump engine RPM by about 200 at 60mph, in O/D.

 

200 really isn't that Muh. I have 4.10s with stock size 265/75/16. Definetly has more grunt and pull.

Helps a LOT going up all these hills. Even helped my mpg.