[ERIC AULL]

Originally Posted by jrh3405

I'm also in the same dilema, I just seen an ad for the 6X SIX-SPEED automatic by TCI,there talking up to 850 horsepower. But i dont see a price tag or BOP bellhousing. Have any of you looked at this OD? What about a gear venders OD? How long is a 200r4 going to hold up to say 500-600 HP?

The price is about $6000 ! with electronics......

[jakeshoe]

Originally Posted by goatwgn

You seem to be the one in the know when it comes to these 2004r units. I wish I had known about you before I had bought mine. Although it seems to be working fine, I read something elsewhere on these threads that bothers me. (I like to see what experiences people have with things I use) I have one of CPTs exterme duty 2004rs I had purchased 2 years ago from OPGI. At first it shifted too hard (I had to copy a GM TV cable setup to get the geometry right). (it shifts fine now-a little hard in 2nd and 3rd, but livable). The only thing odd is my th400 would do a burnout forever and keep pulling, this one does one and then seems to be in third gear when it gets traction(pulls harder than the 400 on actual acceleration if I roll out to 25mph.(Why does it shift during a burnout when the 400 didnt? It is in a 66 Tempest wagon with a mild 455, 3.42 gears and 28" tall tires. The thing that concerns me is the mention of a couple of people of the excess pressure these CPT units run ruining the thrust bearing on the engine. I havent had a problem so far (engine built in 87', but I dont want to have any either) Should I be worryed about this, and If so, how can I prevent it? Also, do I need the billet parts you have with only about 390 hp, 500 lb ft? This is basically just a cruiser. I would appreciate your feedback.

At 500 lb/ft I wouldn't even suggest a 200-4R without a billet forward drum and servo.

The TH400, were you putting it in low gear during the burnout?
A 200-4R will hold low usually, but if you are leaving either unit in drive, it will shift through the gear during a burnout.

200-4Rs don't seem to have excessive converter charge that kills thrust bearings like a TH400 can.

I test the 200-4Rs in my test vehicle all the time and converter charge pressure is usually 15-40 psi, not 70+ like some TH400s will have.

[goatwgn]

I greatly appreciate your response. I did have the th400 in low when I did this. I cannot put the th2004r in 1st yet because I still need to modify the original column linkage to drop down that far. It will go to 2nd but not 1st. Years ago had to grind a little off the stop on the column to get the 3 speed to work with the 2 speed column, guess I will have to do this again. If I decide to go with the billet drum (already have the servo) can you sell me the part and I have a local shop install it, or would I have to ship you the unit? Seems to run very well, hate to remove it at this time. I may take it easy on it and ship it over the winter. Dont want to ruin anything if you think 500lb ft is too much.Again, thanks very much.

[jakeshoe]

The CPT unit may have heat treated parts. Run it until it breaks.
I can sell you a billet drum but you may be OK if that heat treated drum is as good as Art says it is.

[Cliff R]

Considering the cost to upgrade to an OD trans or Gear Vendors, you might consider upgrading the TH-400 with a low gear set and dropping the rear gear ratio back to 2.73-3.08. About the same on the starting line with lower rpm's for "normal" driving, etc.

A LOT less money and still excellent street performance with lower cruising RPM's....Cliff