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You need to do a "project" rebuild posted here for all to see ! This series of Allison's was my favorite. The "AT" "MT" and "HT" transmissions are a blast to rebuild. The newer series of Allison's called "World Transmissions" are a pain to rebuild. All the new electronics to test and worry...

There's lots of little "secrets" transmission rebuilders find out through the years. Since I worked on the larger trucks I had more opportunity's to find out these little gems about the early Allison's and the connections between "GMC" and "Detroit Diesel Allison". Glad this knowledge is finally...

OK Toby. Here are several places I have bought parts from. All sell good quality parts www.transmissioncenter.com Good quality race parts www.transpartsonline.com General good quality kits and parts www.transmissionpartsusa.com General good quality kits and parts www.coanracing.com...

Thanks Toby. I'm still feeling pretty sick from the anti-biotic treatment, but I'm getting better. I hope ! Since I retired I no longer have access to my wholesale suppliers. There are several "performance" venders I still use. I'll send you the information. This is fun ! When I rebuilt the...

One other thing to think about is, can a TH4L80E torque converter be used on the Allison 1540 ? The torque converters are identical between the TH400 and Allison 540 except that Allison uses 6 mounting bolts instead of 3. In fact a lot of rebuilders (myself included) used to use Allison 540...

One nice thing you can use is TH400 plates in the Allison Forward and Direct clutches. This way you can benefit from all the racing clutch plates out there including the heavy duty "Kolene" steels. The early trick for racing TH400's was to use the Allison AT540 clutches since they where very...