- Joined
- Feb 25, 2010
- Messages
- 130
- Reaction score
- 5
- Points
- 18
- Location
- GA via NC Mtns.
- Vehicle Year
- 1990
- Make / Model
- ford
- Engine Type
- 4.0 V6
- Engine Size
- 4.0
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 4"
- Tire Size
- 31X10.50
So, I am wanting to do the "swap out the 2.9 for the 4.0" in my Bronco II. I have the 5 spd tranny. My question is concerning block casting numbers for the early 4.0. It seems there is the 90TM and the 90TM-AB. One relates to manual trannies and the other to automatics. What the heck? I can understand perhaps different harmonic balancers if the two flywheels are different weighted. So, I can get a 4.0 from an automatic donor vehicle or not? Will the whole thing bolt up correctly-is there something about the crank that won't accept manual flywheel-clutch parts? I ask because every place I looked for 90-94 remanufactured engines the two engines are separated by manual or automatic transmission and then do give the different block casting numbers. Thanks, this is the first time I have ever encountered such.