0 Allison MT643, , Transmission Assys, Fits to: , (Used) Allison (AT), TRANSMISSION ASSEMBLY- Model: MT643, Serial Number: 2410344299, Part Number: 23040023, Reference images for condition, For more information about this item, give us a call. We ship worldwide! ( RG HEAVY TRUCK PARTS) 929 W PULASKI HWY, ELKTON, MD 21921, Serial# 2410344299, Part# 23040023,