ford 5.4 zf6 swap

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#16

01-22-2014, 12:56 PM

dr1

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Quote:

Originally Posted by tenth_gen

I have a 99' superduty with a 5.4L and manual trans. I would be interested in the future to see about putting a six speed in it because the gear ratios are too far apart in the five speed

Thats because you dont have a 5 speed in reality, nor will you be obtaining a 6 speed, unless your towing all the time Id say. Unless im towing or creeping up a big hill (like my driveway!) I dont touch 1st.

Its identical to 'Low' gear on the 6 speed that Ford labeled as a 5+Low anyways.

2nd gear and 1st gear is also just about the same between those transmissions. You just gain an extra gear for use in the middle. Which trust me would be great, but I've grown accustom to shifting less at this point, lol.

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#17

01-22-2014, 02:06 PM

GVS

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Quote:

Originally Posted by xmontex4

I've read that the 5.4l has a different bolt pattern than the diesel engines so you would need a gas ZF6 to bolt up to the 5.4l or an adapter plate. Another option would be to get a ZF6 and if it has the diesel bolt pattern just find the gas bell housing and it should bolt up I believe.

I believe the 6 speed for these trucks was the ZF6 regardless if it was gas or diesel, its just rare to fins one in a gas engine super duty.

Bell houseing and X/MIS all one piece.No seperating one from the other.

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#18

01-22-2014, 02:17 PM

GVS

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Quote:

Originally Posted by dr1

dr1,what is identical to "Low"gear on the 6spee?.This is the first time I've heard the ZF six speed refered to a5+Low.

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#19

01-22-2014, 02:22 PM

GVS

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Quote:

Originally Posted by aking225

Would you mind taking some pictures of your transmission and engine if you get a chance just so I can see how it is bolted up? I also believe the 6.8 5.4 and 6.0 diesel have the same bellhousing pattern but I'm not 100%.

I have no idea on how to post pictures here and my drive way is covered in snow and ice.Can't help you.

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#20

01-22-2014, 02:29 PM

dr1

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Quote:

Originally Posted by GVS

dr1,what is identical to "Low"gear on the 6spee?.This is the first time I've heard the ZF six speed refered to a5+Low.

Just as its labeled on the shifter, as a 5 speed with L. However they labeled the 5 speed as a 5 speed, it was just kind of dishonest.

ZF6 Low is equal to ZF5 1st though, least on my 5.4 tranny.

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#21

01-22-2014, 06:44 PM

GVS

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Quote:

Originally Posted by dr1

Just as its labeled on the shifter, as a 5 speed with L. However they labeled the 5 speed as a 5 speed, it was just kind of dishonest.

ZF6 Low is equal to ZF5 1st though, least on my 5.4 tranny.

Low in the ZF6 is 5.79:1.1st in theZF5 is 3.??:1 so not even close let alone identical.

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#22

01-22-2014, 06:47 PM

tenth_gen

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Thanks for the replies. Good luck with your swap OP

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#23

01-22-2014, 08:41 PM

dr1

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Quote:

Originally Posted by GVS

Low in the ZF6 is 5.79:1.1st in theZF5 is 3.??:1 so not even close let alone identical.

Thats not true, its 5.7x. But I'm done derailing this poor fellas post, lol.

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#24

01-23-2014, 08:37 AM

GVS

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Quote:

Originally Posted by GVS

Low in the ZF6 is 5.79:1.1st in theZF5 is 3.??:1 so not even close let alone identical.

I STAND CORRECTED!The ZF5 and ZF6 1st/low ratios are indeed close:ZF5 1st-5.72,ZF6 low-5.79.

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#25

01-23-2014, 02:39 PM

MitchPeters

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One of the Cummins swap sites should have info on bellhousing bolt patterns. I believe the 5.4 manual is lighter duty than the 6.8/powerstroke. Again I read that on a swap site, cumminsford.com????

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#26

01-23-2014, 03:31 PM

MitchPeters

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The 5.4/6.8 have the same bellhousing bolt pattern. The 7.3/6.0 bolt patter is different and is bigger for a larger diameter clutch.

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#27

04-03-2023, 08:56 PM

IWL

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Quote:

Originally Posted by aking225

hello all, I am planning on doing the swap as stated above for my 4r100. im a little stuck on something ive been reading up on however. so, everyone that seems to do this swap does them in 7.3 or 6.0. they all talk about how there is a spacer plate between the engine you need to change. however, when I look under my truck the engine is bolted directly to the transmission. is this supposed to be like this or do I need a spacer?

Hey, I know this is an ancient thread, but I have the same question, about to do my 5.4 ZF6 swap. Did the spacer end up being needed? Or is it just for the 7.3s?

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