What is the differences of 01-02 and 03-05 transmissions ? Can you put an 03-05 trans in a 01-02 truck ? And if so is there any changes to make in efi live? Sorry if this as been asked before. Thanks
couple things...kinda confusing. Mike, correct me if I mixed any of this up:
01-02 trucks have a unique bellhousing and cooler fittings.
03-05 have the same bellhousing.
03-04 have unique cooler fittings that will not work with 01-02 Allisons, or 04.5+ allisons
You CAN use an 03-04 bellhousing in an LLY truck IF you swap the cooler fittings on the bellhousing.
01-02 have a different thread size on the belhousing for the cooler fittings. You can not use 03-04 or 04.5-05 fittings in an 01-02 bellhousing
LLY cooler fitings WILL NOT FIT into an 01-02 bellhousing. 03-04 LB7 allisons have the same bellhousing as the LLY Allisons, but different cooler fittings.
01-03 allisons dont have the G-solenoid in the valve body
04+ allisons have the G-solenoid. There is an exception...All LLY's have the G-solenoid, SOME 2004 LB7's had the G-solenoid (but it didnt do anything). Probably just an overlap in production; Allison started making the LLY valvebodies with the G-solenoid a bit early and decided to throw some extras into the last of the LB7's.
You can use an LLY valvebody (with the G-solenoid) in any 01-04 LB7 allison without problems. You can use an 01-04 LB7 valvebody in an LLY, but you might get a check engine light/set a code unless you reflash the TCM with an 01-03 Operating system (that does not ahve the G-solenoid enabled)
WOW...that was a mouthful. I probably mixed at least some of that up...wait for mike to give the definitive answer.