I can tell you that I took Trannymans advise and I am SOOOO glad I did. I got three of them now. I have the ATSG 4T65E Revised Edition Techtran Manual, the ATSG 4T65E Updated Handbook Techtran Manual and the Hydramatic 4T65E Technicians Guide, Second Edition.

They are worth EVERY penny and then some.