jinx44
Member
- Joined
- December 16, 2008
- Messages
- 21
- Reaction score
- 0
- City, State
- Southeast Missouri
- Year, Model & Trim Level
- 1999 Eddie Bauer 5.0
Okay, still planning everything for my 2000 explorer 5.0 swap into a classic mustang. Yes, I know there are easier EFI 5.0 options, but I want OBD-II and 4R70. There are probably easier Exp5.0 options with earlier years, but I bought this setup cheap for a good running engine and all needed wiring, so that is what I am working with.
My other thread on here helped solve the fuel pump questions I had. Now I am still uncertain on how the VSS/OSS works with the ECM.
From what I have read, the VSS is determined using the ABS sensor in the rear and calculated from there. What does the ECM use this value for? Is it just for speedometer readings? The reason I ask, there is also an OSS sensor in the transmission. I would guess the OSS is used for all pressure/shifting/lockup.
I will NOT be running an electronic speedo. I will retain the original mustang speedo, with mid 90s AODE output shaft and housing which should allow me to use the factory speedometer cable. However, I will still need to control the transmission shift and lockup points. I will have the SCT PRP software for tuning.
So I am trying to decide if I can do the swap without having the VSS/ABS in the rear axle (since I plan to run an 8.8 with centered housing instead of the offset explorer housing) and have the ECM still be able to control shifting.
Obviously my tire size will be different than what the current ECM value is. I have not decided what gear ratio I want to run yet, but it will likely be different too. So if I base it off of the OSS alone and change those values in the software, will the ECM be able to calculate actual speed for trans functions without having a VSS? As was stated, I am unsure what the VSS actually does. I am familiar with late model mustangs, and they only use the OSS for everything speed related.
My other thread on here helped solve the fuel pump questions I had. Now I am still uncertain on how the VSS/OSS works with the ECM.
From what I have read, the VSS is determined using the ABS sensor in the rear and calculated from there. What does the ECM use this value for? Is it just for speedometer readings? The reason I ask, there is also an OSS sensor in the transmission. I would guess the OSS is used for all pressure/shifting/lockup.
I will NOT be running an electronic speedo. I will retain the original mustang speedo, with mid 90s AODE output shaft and housing which should allow me to use the factory speedometer cable. However, I will still need to control the transmission shift and lockup points. I will have the SCT PRP software for tuning.
So I am trying to decide if I can do the swap without having the VSS/ABS in the rear axle (since I plan to run an 8.8 with centered housing instead of the offset explorer housing) and have the ECM still be able to control shifting.
Obviously my tire size will be different than what the current ECM value is. I have not decided what gear ratio I want to run yet, but it will likely be different too. So if I base it off of the OSS alone and change those values in the software, will the ECM be able to calculate actual speed for trans functions without having a VSS? As was stated, I am unsure what the VSS actually does. I am familiar with late model mustangs, and they only use the OSS for everything speed related.