6.9 IDI block bellhousing pattern?
- Thread starter jeditim
- Start date
icanfixall
Official GMM hand model
Welcome to the forum. I think it is the SAE2 pattern but not really confident in my guess. Someone who knows for sure will chime in with facts.
All of the IDI engines use an adapter plate for the ford transmissions. Looks like this.
You must be registered for see images attach
And installed.
You must be registered for see images attach
The underlying pattern is SAE for medium duty applications.
I think Gary is right. I think it's SAE2.
Man you guys don't mess around! Thanks for the fast replies 
Yes we are on the same page = I am looking to verify the pattern on that adapter that is up against the Block (not the pattern that touches the transmission bellhousing). I have 'heard' that it is SAE and I 'think' it's SAE but so far I have not found anyone who 'Knows' it is SAE or which one.
Yes we are on the same page = I am looking to verify the pattern on that adapter that is up against the Block (not the pattern that touches the transmission bellhousing). I have 'heard' that it is SAE and I 'think' it's SAE but so far I have not found anyone who 'Knows' it is SAE or which one.
Negative I do not believe it is sae as those are usually round...just from what I have seen.
FarmerFrank
Full Access Member
The medium duty trucks use a different adaptor to make them SAE 3? Maybe 2.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
The BLOCK pattern is not SAE. It is IH. Most medium duty IH idi use an SAE#2. I have seen some #3 but not many.
I have heard also that it's a oddball international pattern. I sure would like a Ford engineer to explain why when they made their adapter for this engine, they didn't use the 460 pattern on the other side of it?
If you need a sae pattern I think you can get one from a school bus, uhaul, or a dump truck that used this engine.
If you need a sae pattern I think you can get one from a school bus, uhaul, or a dump truck that used this engine.
icanfixall
Official GMM hand model
I bet the single reason for NOT using the 460 block pattern is the gas trans usually has a higher gear ration than the diesel trans.
Garbage_Mechan
Garbage Mechanic
Back at the beginning of the whole mess IH built the 6.9 to be a medium duty truck engine, some say they modified a medium duty gas engine they had (MV404?). So the BLOCK bellhousing mount pattern was set before Ford got into the picture.
So Ford needed an adapter. So they made one. Why did they make it into another oddball pattern on the tranny side? I certainly would think changing a letter in the model number of the trans along with changing a gear or two would be much cheaper and easier than re-casting the whole housing of a c6 to fit some oddball bellhousing someone came up with. ZF had to have a whole separate casting just for these engines. They could have used the same 460 casting, and just changed the gears around if they had made the adapter go from IH to big block Ford.
Similar threads
