What exactly is a gryphon upgrade.

[Longshot270]

Originally Posted by cowboy

I will be using an X or H

and Jack I asked the question about which tunes because I really don't know, 87 89 and 93 are all readly available around here, but I get your point about 93.

I plan on using the 89 performance for my daily driving. Towing right now mind you is in 3rd gear running about 60-65 down the highway is usually between 3k -4k rpms, but thats without the dual exhaust and running those new 35's I got, I don't suppose I should regear it do ya? to a 4.10 or 4.56

So you're taking the O/D off? Do you really need to? That is really just used if the truck is hunting for the right gear configuration.
If I do that I think my RPM is just hitting 3k at that speed with the TC locked...I have 30 inch tires with 3.55 gears. I'm going by math and what I usually see cruising around 70 in 4th, funny I was pulling up a grade with over a half ton in stuff earlier and I didn't remember what rpm I saw at the 60ish speeds. Wish I had read the post sooner.
Edit: pulled some info from some data logs and made some estimates. I'd be running around 3100 rpm in 3rd with the TC locked, so my memory isn't too bad.

With 3.73 gears at 35s you should be sitting even lower than I am. Now if the truck already had 4.10 gears you would be just a bit higher than me. Are you 100% sure the truck has stock gears? What axle code do you have in your door jamb?

[cowboy]

Yes I do take the O/D off been doing that for years when towing. Old habits die hard and I learned before I was even driving when towing don't use the O/D.

I'm pretty sure they are the 3.73 gears, from what the paperwork states and when I first hooked up the evo that's what the ecu says it has in it. I'll check the door jam later to make sure.

[Longshot270]

Originally Posted by cowboy

Yes I do take the O/D off been doing that for years when towing. Old habits die hard and I learned before I was even driving when towing don't use the O/D.

I'm pretty sure they are the 3.73 gears, from what the paperwork states and when I first hooked up the evo that's what the ecu says it has in it. I'll check the door jam later to make sure.

Well the programmer doesn't actually know what is in the axle. That is the default value for custom settings. If you got the truck used it could say anything. It probably wouldn't hurt to go with lower gears though. Especially if you are towing a lot of heavy loads.