| Author |
Message |
Robert Chamuler (Nemos88)
Registered Member
Username: Nemos88
Post Number: 1
Registered: 8-2006
Posted From: 24.19.183.71
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, August 21, 2006 - 7:09 pm: | |
I have a MTB 648 in my bus. I this a good transmission? Also if anyone knows, what speeds should it stift at. It is a 4 speed, 3 speeds plus lockup i believe.
Thanks in advance
RLC |
Greg Peterson (Gpmci102)
Registered Member
Username: Gpmci102
Post Number: 16
Registered: 8-2006
Posted From: 71.228.18.37
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 22, 2006 - 12:12 am: | |
This transmission is from the MTB640 and MTB650 lines of Allison trans. This is an early attempt of an electronic version of that family. It is like the HT748 that is electronic control as compared to the HT 740. This trans is a medium duty and is for less than 300HP and not too much torque. It works well with engines that are also electronic controlled. The shift points can vary depending on the parameters of the computer program. With some engines torque control feedback is provided to the engine computer in order to make shifts smoother and cause less strain on the drive train. You see many of these used with old DT466 and Cummins 8.3L engines. These were usually set at about 250hp. If you have a two stroke a 6v-71t it would be ok but you don’t want to set an 8v-71 or 6v-92ta up to powerful for this transmission. The DDEC 6V-92ta could probably control the torque so that no damage would occur. This again depends on the program and because both engine and trans. are out of production good luck at getting any info. If you want the best info on your trans you may have to spend some $$$ and buy the manuals from Allison. If you are going to keep the bus then the manuals are a good investment. |
David Evans (Dmd)
Registered Member
Username: Dmd
Post Number: 69
Registered: 10-2004
Posted From: 71.125.9.62
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, August 22, 2006 - 5:26 pm: | |
Robert, you can download a copy from www.Allisontransmissions.com. only the operating manuals and possibly service not repair. |