Hey Radz28!
Roddrz (Rod) is the fella

that
posted the complete removal, upgrade and install of the NGD VB into a 10L60 transmission.
Please refer to that
post for pictures to the recommendations below....
I sincerely am disappointed to hear that NGD provided a kit incompatible with the 10L90 transmission. :(
I'm genuinely disappointed about this situation and the inconvenience it has caused you, especially given my previous endorsement of this company. However, I believe they will make good on this issue.
Keep Calm and Carry On.
For context, my experience was with the 10L60 transmission, where I encountered no compatibility issues.
I'm completely satisfied with my upgrade results with 6000 miles on VB.
Both automatic and manual modes perform excellently, with crisp, immediate shift engagement that should maintain performance for years without gradual degradation to the entire system.
I'm now enjoying my transmission with complete confidence.
When I want spirited driving, I disable both traction control modes (10-second button press), shift to manual mode, and use the paddle shifters for an engaging driving experience.
If my experience degrades, I will post an update.
Here are some technical tips/recommendations for your transmission work:
Solenoid Clips: Use hook and pick tools to remove the OEM compressible spring retainers, which are known to be problematic from the start.
During reinstallation, ensure the clip insert is properly oriented within the spring retainer.
Transmission Thermostat: Consider removing the transmission thermostat to enable complete fluid flushing with cool transmission fluid.
This eliminates the need to raise temperatures to open the thermostat for flushing. Note that adding cool fluid typically causes the thermostat to close, preventing thorough flushing.
I've been operating my transmission between 100°F and 125°F with excellent shifting performance.
Transmission Pump Inspection: Examine the transmission pump's helical gear for wear signs, as this represents the next common failure point in these transmissions.
Ford uses straight gears, which are noisier but don't experience the press-fitting issues associated with GM's helical gear design.
Check Ball Procedure: To prevent check balls from dropping during service, remove all valve body plate bolts first, then flip the valve body over before separating the halves.
Drain Plug: Use a drain plug from Superior Solutions with pipe thread sealant or tape on the brass threads for No Leaks.
Valve Body Upgrade Rationale (A10 Clutches Slipping): The valve body upgrade represents a cost-effective preventive measure against future transmission issues.
Similar to upgrading engine components like camshafts, crankshafts, oil pumps, or lifters, this modification addresses known weaknesses in the OEM design that can fail under stress, despite previous recalls.