Hey folks. Looks like I've just about secured purchase of a ~130k mile A750F out of an '07 4Runner to replace my A750F in my LX.
Background:
This truck has had the torque converter replaced twice already. First was when it experienced a lockup solenoid failure and when it was flat-towed to the shop, the torque converter was ruined. The second was later, at ~168k, for an unknown reason. Now, it needs a 3rd. I'm more than willing to bet that the servicing dealer did not clean or replace the valve body properly, resulting in this truck eating these last two torque converters. That is why I am replacing, as I do not think feeding it a 3rd will finally satiate the beast.
Swap Thought Process:
The A750F should bolt up to the 2UZ and the transfer case in my LX, provided I exchange bell housings (if needed) and the rear adaptor (pretty sure this is needed). The A750F came in the Sequoia, Tundra, Tacoma, FJ Cruiser, LX 470, GX 470, 4Runner, Land Cruiser, and a few other vehicles overseas. At its core, it should (should being the operative word) be the same. The part numbers vary per application for the assembly, since the assembly appears to be sold with the rear adaptor, bell housing, and the actual transmission unit itself. Any year-to-year incompatibilities marked in the part system for the LC/LX platform, I believe, can be explained as follows:
I believe that these part numbers being incompatible, going backwards, is simple. Why would Toyota put a A750F in an '03 without a dipstick? That would make the Owner's Manual 'wrong', simply because there would be no dipstick and WS ATF would be 'required' from that point forward. ToyoDIY.com also reports that the transmission in the '03 is marked as compatible '05, but not vice versa.
Questions/Concerns:
1. I have been offered an OEM Flex Plate and OEM Torque Converter (both at ~130k as well) at a great price. An OEM torque converter alone is $750, and I can't seem to find any other brand of torque converter that I'd be comfortable purchasing. Is this a bad idea? 130k is relatively low mileage, and torque converter failures seem to be few and far between. Open to suggestions!
2. The EWD for the A750F seems to be pretty basic, but I am still concerned about wiring differences between the 4 years of manufacturing. I think I will be fine, but if anyone has any information I am unaware of, please, let me know.
3. I have made a list of other items to purchase for this job, including:
4. I'm pretty sure I will be swapping the '03 pan to the '07 transmission. Any reason not to? I will make sure the pan is clean, of course, before reinstalling.
Final Words/Credits:
@2001LC has been a great help at answering some of the questions I have had. In fact, I do not think this would've been possible without him. There are many, many threads discussing the A750F and the potential differences between the part numbers and the platforms they were installed in. His 'Unicorn' thread has many posts regarding the transmission that are a great read as well. Thank you @2001LC!
I will try my best to document this swap as best as I can, hopefully I won't run into any compatibility issues (though, why the hell would Toyota change the A750F across platforms without changing the model code, but anything is possible).
If anyone has anything else to add, please chime in below!
Background:
This truck has had the torque converter replaced twice already. First was when it experienced a lockup solenoid failure and when it was flat-towed to the shop, the torque converter was ruined. The second was later, at ~168k, for an unknown reason. Now, it needs a 3rd. I'm more than willing to bet that the servicing dealer did not clean or replace the valve body properly, resulting in this truck eating these last two torque converters. That is why I am replacing, as I do not think feeding it a 3rd will finally satiate the beast.
Swap Thought Process:
The A750F should bolt up to the 2UZ and the transfer case in my LX, provided I exchange bell housings (if needed) and the rear adaptor (pretty sure this is needed). The A750F came in the Sequoia, Tundra, Tacoma, FJ Cruiser, LX 470, GX 470, 4Runner, Land Cruiser, and a few other vehicles overseas. At its core, it should (should being the operative word) be the same. The part numbers vary per application for the assembly, since the assembly appears to be sold with the rear adaptor, bell housing, and the actual transmission unit itself. Any year-to-year incompatibilities marked in the part system for the LC/LX platform, I believe, can be explained as follows:
- MY03 LC/LX was released with the A750F with a dipstick (part of the pan)
- MY04-05 LC/LX was released/produced with an A750F without a dipstick, and Toyota WS-ATF being required.
- MY06-07 LC/LX was released/produced with an A750F with a different clutch pack setup:
I believe that these part numbers being incompatible, going backwards, is simple. Why would Toyota put a A750F in an '03 without a dipstick? That would make the Owner's Manual 'wrong', simply because there would be no dipstick and WS ATF would be 'required' from that point forward. ToyoDIY.com also reports that the transmission in the '03 is marked as compatible '05, but not vice versa.
Questions/Concerns:
1. I have been offered an OEM Flex Plate and OEM Torque Converter (both at ~130k as well) at a great price. An OEM torque converter alone is $750, and I can't seem to find any other brand of torque converter that I'd be comfortable purchasing. Is this a bad idea? 130k is relatively low mileage, and torque converter failures seem to be few and far between. Open to suggestions!
2. The EWD for the A750F seems to be pretty basic, but I am still concerned about wiring differences between the 4 years of manufacturing. I think I will be fine, but if anyone has any information I am unaware of, please, let me know.
3. I have made a list of other items to purchase for this job, including:
- Transmission Pan Gasket
- Transmission Pan Filter
- Synthetic WS-ATF (not sure if I want to go Toyota or not, because holy moly that stuff is very expensive compared to a high quality, actual synthetic ATF)
- Toyota Red Coolant (remove rad to pull ATF cooler)
- BG Transmission Flush
- BG Transmission Conditioner
- Gear Oil (transfer case)
4. I'm pretty sure I will be swapping the '03 pan to the '07 transmission. Any reason not to? I will make sure the pan is clean, of course, before reinstalling.
Final Words/Credits:
@2001LC has been a great help at answering some of the questions I have had. In fact, I do not think this would've been possible without him. There are many, many threads discussing the A750F and the potential differences between the part numbers and the platforms they were installed in. His 'Unicorn' thread has many posts regarding the transmission that are a great read as well. Thank you @2001LC!
I will try my best to document this swap as best as I can, hopefully I won't run into any compatibility issues (though, why the hell would Toyota change the A750F across platforms without changing the model code, but anything is possible).
If anyone has anything else to add, please chime in below!
