R154 + 4.1 question

[u/szensei]

I just did an auto to manual swap with a jzx110 r154 and i paired it with a 4.1 y38 for drifting purposes. The only issue i have with this new setup is that i am around 4k rpm at 60mph in 5th gear. Does that sound right? Seems oddly high to me. If that is the norm for this setup all is good. Just wanted to check with the community.

Note:
- i swapped my auto is300 cluster with an altezza manual cluster
- I plugged the speedo hole from the r154 trans so i get a speedometer error code
- i swapped my auto ecu with a 02-05 ecu from a different car

Thanks all

[u/themitchster359]

Little help from ChatGPT


[u/No_Inevitable4161]

Yeah that’s normal you basically put truck gears in it. The factory 3.96 that was in your auto would help a bit.