6.9l and 7.3l swap? - Ford Powerstroke Diesel Forum
7.3L IDI (Non-Powerstroke) Diesels Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 07-08-2010, 01:30 PM
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6.9l and 7.3l swap?

I have a '86 ford with a 7.3L swaped in to it by the previous owner and the clutch is toast which aroused some problems/questions.

Can you directly swap a manual 7.3L motor in the place of a manual 6.9L motor without changing anything and still use the original clutch setup for a 6.9L using the 7.3L flywheel?

If not, can the flywheels swap over without drilling?
If the fly wheel is swapped will the 6.9L pressure plate/diaphram work on it?

I posted the thread ''I need help, clutch'' but the more i read it the stupider it sounds! I talked to summit racing and they told that they wont help me unless they know flywheel bolt pattern, the number of splines on the input shaft and the diameter of the disc! so Im SOL there!

Im a cummins guy but I love this ford and drive it the most but unforuneatly i dont know crap about fords so any help or advise is extremely apreciated!
Thanks jake

Last edited by 1986fordjw; 07-08-2010 at 03:21 PM.
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Old 07-09-2010, 08:33 AM
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7.3's used dual mass flywheels with the ZF-5 speeds. 6.9's did as well. 6.9's with T-19 4 speed had a solid flywheel.

That said, ZF input shaft is larger than T-19. You can interchange them, but you have to make sure that the clutch has the correct size for the input shaft.

So you have a 7.3 right now, correct? What are you wanting to swap?
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Old 07-11-2010, 11:55 AM
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Im trying to understand how to swap in a 7.3 into a 6.9 pickup. I dont know how to swap it so im wanting to find out the procedure to do it so i can understand 1) how its done and 2) how to choose the right clutch. I talked to the previous owners dad who gave him the motor just yesterday and he said they used a 6.9l fly wheel and 7.3l clutch. The clutches are different because of the input shaft am i right?

I know I sound retarded or some shi! but I just dont know enought about these pickups.
thanks for the info, jake
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Old 09-11-2010, 07:01 PM
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did you get your swap done?
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