With the additional fast reverse, TerraTran delivers improved productivity and optimized efficiency.Īccording to Allison, field tests conducted over approximately two years have demonstrated that TerraTran delivers enhanced drivability, gradeability and manoeuvrability under demanding operating conditions. TerraTran, which has maximum power capability of up to 800hp, and torque capability up to 3,025 lbs/ft, dependent upon the application, features seven forward and two reverse speeds.
Alison transmission series#
Thanks for the warm welcome.TerraTran was developed based on customer feedback, which indicated a need for the proven reliability and durability of Allison’s 4000 Series transmission, but with increased horsepower, torque and GVW capability, while also adding fast reverse capability. I didn't even realize that I live 10 minutes from the FMCA headquarters in Cincinnati. I have put fuel injector cleaner into the tank and have let it idle to try to help with the bad gas after running out the bad stuff. When getting a run at a hill it will start to climb and then nothing, play with the throttle and all of a sudden it will go again. Starts right up, idles fine, just at mid range it intermittently will just do nothing. I have put 2,600 miles on it since early December. I have read the turn signal wiring carries other circuits also so that may come into play also. I haven't had the opportunity to check fuses ect yet because of surgery and extreme cold weather since out New Years trip to Florida. All the maintenance was done before I bought it so the previous owner said. My turn signals quick working and I bought gas at a off the highway gas station that big trucks couldn't pull into because of the size station and that gas really made it run worse. On the way back it was raining cat's and dogs. Meyers it hickuped a few times on the way down. It drove fine the first couple shorter trips we went on. No codes through D-1 up through D-5, no D6.
![alison transmission alison transmission](https://d2uhsaoc6ysewq.cloudfront.net/246/Transmissions-Allison-OTHER-13175445.jpg)
When I put the transmission into D for drive,(push button with D N R arrows and mode) it shows 6 and it does go through all six gears. It is a basic mechanical transmission and very well built. Your 1989 Allison will not be an electronic 6 speed transmission, but one of their mechanical 4 speed transmissions.
Alison transmission code#
Transmission seemed to operated normally for the rest of the evening and in further travels several days later.Īny idea as to what the '++' code means and should I be concerned for further transmission damage? Considering that it was rather late at night, raining and we really needed to get on down the road, I waited until the warnings disappeared and the selector returned to normal, I then hit the 'D' button and we were on the way. This cycled several times over the next few minutes. A minute or so later the warning light returned as well as the '++' display. Light stayed on for approx 15 seconds, went off and selector returned to 'NN'. Been there a couple of minutes when I noticed the 'Check Trans' light illuminated on dash with '++' showing in transmission selector display area.
![alison transmission alison transmission](https://images.truckpartsinventory.com/parts/25120/2005-Allison-HD-4000-Transmission-Assys-nhUPioHw1KEc_f.jpg)
Coach was left running, in neutral with brake set. On a recent trip, about 300 miles into the day's travel, wife and I stopped to make a sandwich at rest area along highway.
![alison transmission alison transmission](https://d2uhsaoc6ysewq.cloudfront.net/246/Transmissions-Allison-OTHER-9441330.jpg)
I've got an '07 HR Ambassador with the Allison 3000 series transmission with 60K miles.