Changing horsepower and effective torque to the tranny.......

Sound's like they wanted to charge you for it and not even touch it. I got the same motor and what I was told was that they could do the up-grade but the warranty would be voided my problem was with the price of the up-grade they wanted $750 on top of the fee for the overhead run that I took it in for.Anyhow I did'nt do it what I did do was ordered the power pack from Platinum for $265 and it gave me more MPG's and more power for a fraction of what the stealership wanted.

 

he has his head up his ........! unless you have an automatic tranny and there is something there I don't know about. THe simple fact is cat has issues uping HP, they just don't liek to do it. there is no reason that trans won't hold the torque unless you are some rookie driver out to tear it up. But that is what they will tell you.
I have no explanation for why he is saying it would be inefective. 1650 doesn't mean it limits output to 1650, it means that's the max torque the trans is rated for.

 

Man i bet im turning 2700lbs of torque through a 1850 18 speed, no issues. They probably meant going to 500hp from 475 would be pointless, and he is right since you wont feel the power.

If you still have warranty on the trans then leave it, but once it runs out set it to 550hp and 1850lbs.

 

When the tranny is built, is when the specs are determined. To obtain a heavier torque rating, stronger parts would have to be used at the time of building; (clutch also needs to be of heavier specs). HOWEVER, as 550 stated, trannys have very conservative torque ratings. I know quite a few people who up rated to 550 from 475, with a 1650 tranny, and no problems.
Another option, if you want to be safe, is to program the engine to 550 in the last two gears. Cat will usually have no problem doing that, and if you look on the Roadranger website, they state that it won't void the warranty; (on certain models).
When Cat overhauled my '96 3406E, they offered to do this, knowing I had a 1650 tranny.

 

Droy is right on the money, im sure if i got on it in the lower gears and saw full boost with 80k lbs in 3rd id be picking up parts.

 

Cat will NOT rate above the trransmission input rating. One too many folks have taken them to court for a new trans when some "steering wheel holder" Cobbed on it in the lower gears.

 

As I previously stated, in 2004 when LA Machinery (local Cat Dealer) overhauled my 3406E, THEY informed me it qualified for a FREE upgrade to a 550, some sort of Cat promotion, the only cost would have been the re-flash. Whenever they saw that my tranny was only rated for 1600/fpt, service manager stated the next option was to uprate it to either 500, or 550 in the top two gears only. When attempting to uprate, they found that there was not a program available in their system to do so. The local Cat home office in Reserve, LA. COULD have written the software, (aprox. two weeks time) then sent it to the Lake Charles store to be downloaded into my truck, which I would have been billed for (approx. $150-$200, + $ of reflash).

As I also previously stated;
If you go to the Eaton/Fuller Roadranger site you can read a statement saying that on SOME models, an uprate of horsepower in the last two gears WILL NOT void their warranty. The Kenworth dealer in Lafayette,LA, and Fort Worth TX. and also as I mentioned, the local Cat dealer here, and Reserve, LA all stated they could and would do that kind of engine uprate. The International dealer here in L.C. LA, also stated they would do it pending an OK from the Cat people, which I have not had to ask for, (getting a full 550 uprate from another source).