Ford ZF6-S6-650 model - Will it bolt behind any of the newer gas engines?
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Tuned
Joined: Nov 2008
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From: Oregon
Ford ZF6-S6-650 model - Will it bolt behind any of the newer gas engines?
Good Morning;
I have the: Ford ZF6-S6-650 model in my truck bolted to the 2v 6.8l V-10 Mudular engine
Will this manual transmission bolt behind any of the newer gas engines, engines made after the 4.6,5.4, 6.8l Ford Modular gas engines?
Thank you
I have the: Ford ZF6-S6-650 model in my truck bolted to the 2v 6.8l V-10 Mudular engine
Will this manual transmission bolt behind any of the newer gas engines, engines made after the 4.6,5.4, 6.8l Ford Modular gas engines?
Thank you
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Joined: Jan 2025
Posts: 499
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From: White Bear Lake
So the bellhousing pattern never changed from the original 3 mod motors. It is still the same on the coyote, the 6.2 and the 7.3. Ford did make a 5 speed 6.2 for the south American market but it is going to be almost impossible to locate the correct parts for them. Plus they used a weird Tremec that I have never seen or heard of. Unless someone knows someone there's no way for a US/Can dealer to access Global Ford parts catalogs. There is a post on here somewhere I saw that the 7.3 will accept a modular flywheel and clutch but the pilot bushing is a custom install. Not sure what the trans was however I think it was in an ancient F150 or bronco. The issue I forsee though is the balancing. I don't know if the 6.2 or 7.3 are internal or external balance. You'd have to consult an engine builder with that. So in theory possible but IDK if it's be all that worth it. And I love stick trucks, I have had an IDI, a OBS pstroke and a OBS 5.0 F150.
-Dan F
-Dan F
Thread Starter
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Tuned
Joined: Nov 2008
Posts: 499
Likes: 87
From: Oregon
So the bellhousing pattern never changed from the original 3 mod motors. It is still the same on the coyote, the 6.2 and the 7.3. Ford did make a 5 speed 6.2 for the south American market but it is going to be almost impossible to locate the correct parts for them. Plus they used a weird Tremec that I have never seen or heard of. Unless someone knows someone there's no way for a US/Can dealer to access Global Ford parts catalogs. There is a post on here somewhere I saw that the 7.3 will accept a modular flywheel and clutch but the pilot bushing is a custom install. Not sure what the trans was however I think it was in an ancient F150 or bronco. The issue I forsee though is the balancing. I don't know if the 6.2 or 7.3 are internal or external balance. You'd have to consult an engine builder with that. So in theory possible but IDK if it's be all that worth it. And I love stick trucks, I have had an IDI, a OBS pstroke and a OBS 5.0 F150.
-Dan F
-Dan F
I am thinking that a 351 or smaller, carbed, or even an older 70's or 80's carbed Ford engine, would have more power amd still better fuel mileage operating two less cylinders than this 2 valve V-10
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Joined: Jan 2025
Posts: 499
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From: White Bear Lake
Ohhh I got you. Unfortunately not, Ford started using the modular bellhousing pattern in late 92 or 93 so only very early 4.6's had the small block pattern. The two are not interchangeable. You could use the ZF5 however (I know you said you have a 6), which was behind the 351/5.8 in F250 and F350's from 88-97.
All depends on the application If it is a truck then you may get better economy but it's still lugging around a 6-7k lb vehicle. Small blocks, while they can make decent torque it's not in the same part of the rev band as a V10 or big block would. Just using stock figures the 2 valve V10 makes 425ft-lbs and the highest output 5.8 made 340 in the Lightning. If you build up a 351 sure it would probably make more but power requires fuel and more power means more fuel so IDK if make a 350-400 horse small block in a truck would gain all that much if any. And youd have to do quite a bit to make a garbage 70's and 80's smog low compression engine to make respectable power.
-Dan F
All depends on the application If it is a truck then you may get better economy but it's still lugging around a 6-7k lb vehicle. Small blocks, while they can make decent torque it's not in the same part of the rev band as a V10 or big block would. Just using stock figures the 2 valve V10 makes 425ft-lbs and the highest output 5.8 made 340 in the Lightning. If you build up a 351 sure it would probably make more but power requires fuel and more power means more fuel so IDK if make a 350-400 horse small block in a truck would gain all that much if any. And youd have to do quite a bit to make a garbage 70's and 80's smog low compression engine to make respectable power.
-Dan F
Last edited by AppleFordParts; Oct 28, 2025 at 09:39 AM.
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