The research I did doesn't answer what I have found.
I see that the TorqueFlight Automatic 999 was use behind the inline 6 in the Wranglers and the late CJs before it. I see that an AW4 is used in the cherokee behind the In line 6 for 87 on. Both used the 231 t case. I also see were people say the dana 300 t case will bolt up to the TF99.9 (of course in the CJ as they used the 300). Don't read that it bolts up to the AW4. Ok my confusion and question. I had the AW4 with a 231 from a 89 XJ and my dana 300 would not bolt up to it (I think it was the splines or shaft size). I now have a TF999 and 231 from an 87 YJ (yes, its a 231, not a 206) and before I take it off and get all messy, what gives? meaning where is the difference in the component matching? The 4.2 and 4.0 have a standard bolt pattern and differnt transmissions have this style front to bolt to them....I see the 904 is the same as a 999 but with the bell housing pattern to match the 4cyl engines, but does the 231 come in different versions to match the different transmissions OR are the output shafts of these Jeep transmissions the same to match to a standard 231 case? If so, why didn't my XJ unit work? Anybody got a bunch of 231 knowledge to share??
I see that the TorqueFlight Automatic 999 was use behind the inline 6 in the Wranglers and the late CJs before it. I see that an AW4 is used in the cherokee behind the In line 6 for 87 on. Both used the 231 t case. I also see were people say the dana 300 t case will bolt up to the TF99.9 (of course in the CJ as they used the 300). Don't read that it bolts up to the AW4. Ok my confusion and question. I had the AW4 with a 231 from a 89 XJ and my dana 300 would not bolt up to it (I think it was the splines or shaft size). I now have a TF999 and 231 from an 87 YJ (yes, its a 231, not a 206) and before I take it off and get all messy, what gives? meaning where is the difference in the component matching? The 4.2 and 4.0 have a standard bolt pattern and differnt transmissions have this style front to bolt to them....I see the 904 is the same as a 999 but with the bell housing pattern to match the 4cyl engines, but does the 231 come in different versions to match the different transmissions OR are the output shafts of these Jeep transmissions the same to match to a standard 231 case? If so, why didn't my XJ unit work? Anybody got a bunch of 231 knowledge to share??
