Gde, any of them, stay away of chips, those don't change the things that gde does (like injection, egr, etc), and gde adds reliability to your crd also. For either one, plan a torque converter if you didn't replace the stock yet, as the stock will just shudder with the power from either tune or chip. Gde has a lower torque Eco tune also, if you plan in keeping a stock torque converter.

Btw, if you want power, you'll need to kind of suck it up and get a better torque converter...

1. How much will a torque converter upgrade cost?
2. Where do I get one? I haven't been able to find any, so what do you recommend
3. Can I replace the torque converter by myself or do I need to bring it in?

1. depends on what you get - Euro TC is $509 + shipping and such from idparts; some have used a Dodge truck TC that's compatible with a 545RFE transmission for something on the order of $250 +; Suncoast if they still sell a CRD TC likely runs ca. $800; a good local transmission shop might could build one for $???
2. see above
3. if you have to tools, skills, some sort of lift access, transmission jack then yes you can do it yourself. IMHO easier to pay good local tranny shop to do it.


Points:
1. there is nothing special about the 545RFE transmission. It's a standard DCJ tranny that any competent shop can work on
2. if you go with a GDE EcoTune there is likely no need for a new TC, certainly not soon.
3. if you do get a new TC also get a Transgo kit or the new upgraded tranny front pump.

1. depends on what you get - Euro TC is $509 + shipping and such from idparts; some have used a Dodge truck TC that's compatible with a 545RFE transmission for something on the order of $250 +; Suncoast if they still sell a CRD TC likely runs ca. $800; a good local transmission shop might could build one for $???
2. see above
3. if you have to tools, skills, some sort of lift access, transmission jack then yes you can do it yourself. IMHO easier to pay good local tranny shop to do it.


Points:
1. there is nothing special about the 545RFE transmission. It's a standard DCJ tranny that any competent shop can work on
2. if you go with a GDE EcoTune there is likely no need for a new TC, certainly not soon.
3. if you do get a new TC also get a Transgo kit or the new upgraded tranny front pump.

Ok kinda off topic but do you guys have any tips on an air intake? Dos donts?

what will need to be done to the converter for it to be able to handle the hot tune?

I'll try one last time as we seem to be "talking" past each other. The stock OEM torque converter is not the strongest thing in the world but it's not going to grenade just because you got a tune; the exception to that is if your "tune" is the GDE Stage II turbo and associated tune. In the latter case the shudder is massive but only happens if you stomp the go pedal; I drove for ca. 2 months before upgrading TC with no problems. With the GDE EcoTune the stock OEM torque converter is just fine; drive it, service it properly with ATF+4 should last lots of miles (my son has this combination with no issues in ca. 50k miles). With the GDE HotTune depending on how you drive the OEM torque converter may be just fine for lots of miles but does NOT need to be replaced unless you have shudder issue. Of course in the latter case if you have the cash laying around and want to replace the TC just because you got the HotTune feel free.

Running the Yeti Stage IV Hot tune along with an adjustable Diablo Power Puck and a Suncoast Converter and cannot make it shudder under any situation including towing. The Suncoast will handle anything you can subject it to with the 2.8 CRD, its tough and the way to go if you can swing the price....