P Pump 12V Cummins w/ HD Allison

[tanman_2006]

From Blue Bird bus

http://wichita.craigslist.org/pts/5416573755.html

 

[THEFERMANATOR]

Most likely an AT545 ALLISON.

 

[tanman_2006]

Is that the one that doesn't have park?

 

[THEFERMANATOR]

I think so.

 

[tanman_2006]

Not the end of the world but not the most convenient.

 

[THEFERMANATOR]

If it is the 545, they weren't geared the best.

 

[tanman_2006]

Have to run 3.08's maybe. Its supposed to like higher Rpm's under load so 3.42's might work.

 

[THEFERMANATOR]

That is a LOW RPM engine, I believe redline is 2350 or 2500 on it. You would need 3.08's just to be able to run over 70 with a 235/85/16 tire. And depending on which trans it has, you could be SERIOUSLY limited on your swap options. Looks as though some of these got the AT643 which is a BIG transmission, and weighs in around 460 pounds. The AT545 is still pretty large, but weighs in at a more reasoneable 275 pounds.

 

[tanman_2006]

I'm not personally looking to do a Cummins swap but I've seen the 545 behind a 6.2 banks truck in a crew cab dually

 

[THEFERMANATOR]

I'm not personally looking to do a Cummins swap but I've seen the 545 behind a 6.2 banks truck in a crew cab dually

The 545 I believe isn't all that much bigger than a TH-400 since they share some parts. If it has the AT643, that is a BIG trans for a 5.9L.

 

[tanman_2006]

4th is only 1:1 but at least it has extra lower gears. Maybe add an od or 2 speed rear and have plenty of gear options