From those that have been there and done that, is it usually better to get the complete trans than to have one built by a reputable shop?
No, unless you have money to throw away. For the most part, the 48RE is a solid trnasmission that really needs very little replaced and tweaked to make it a great unit.
How much you spend is directly related to how much you want to beat on it. Period. $2500 in parts and $500 to assemble and you have a SOLID unit if you get the right parts and the builder knows what he is doing.
If you want to spend $5k thats all right also and you have a lot more head room to work with.
Decide what you want them talk to a local builder that can and will support you if there are problems. Not that Goerend or Garmons are bad in the support area but you have to get them on the phone first and explain and translate what you feel is wrong. A local cna usually be grabbed and shown the problem.
I would ALWAYS go local if possible. Keeps your money working where you live.
Hate to say what i've heard from a mech rather than being the mech, but a dodge mech at the dealership told me that the engineering control specs on dodge transmissions parts were not exacting enough for him to simply replace one part and then to put it back together and think that everything was going to be okay.
Of course not, and he doesn't get paid much for replacing 1 part, the dealership doesn't get paid much for replacing 1 part, Dodge doesn't make anything on 1 part. Begin to see the pattern here?
In one aspect he is correct, the OE QC specs are not that great, usually on the high side. However, for a stock unit they will run with no issues on the high side. Whne you worry about the specs and consistentcy is when you start pushing the power and the hard use. THEN it makes a difference.
On a stock unit, he is angling to pad his pocket at your expense. The 48RE is a solid transmission despite its challenges created by Dodges NVH initiatives. Unless you just run it way too long replacing a few pieces works quite well.
