they are both gear reduction what makes one better ? different gear ratio??
they look like the same physical size
just the protrusion on the 6.0 gear looks different ?

 

this may show why a 6.0will fit a 6.4 but perhaps not vice versa ??? (snout)
plus they are twice as much from autozone ??

 

by this angle
the gear protrusion at park looks close maybe a little more on the 6.4?

 

I really have no idea whats different, but every 6.4 ive been in spins over way better than a 6.0.
And yea, cheapest 6.4 starter I found was $300, and cheapest 6.0 is $85, I dont plan on buying a new one, I was gunna hit the wrecking yard.

 

More than likely it the motor not the starter that is making the difference.

 

Very interesting... I know I would should like to know the answer... so, if and when any body finds out... please post it.

Thanks

 

came across this while searching if it would work or not
6.0 starter in a 6.4 - Ford Diesel Power Forums

 

Yea thats the same thing I saw.

 

is the guy in that post saying he did put a 6.4 starter on a 6.0 and it worked with no issues?

 

If I remember correctly a 6.4 starter is tighter to get out meaning there is less room to remove it. Other than that I haven't paid attention to the physical differences.

I've seen some 6.0s crank in the 180-190 RPM range, that's really singing for a 6.0

It's possible because of the different engines the starters are made different to handle the longer crank times a 6.0 might experience compared to a 6.4.

 

I just checked mine, its turning about 150 (top right), it just seems slow to me.
Crank rpm: Crank rpm - YouTube

 

I think the only thing they could change is the gear ratio to get it to spin faster
but that would give it less torque

 

I might try to get one next week and give it a try if I have time, I have to go to school on the new aluminum f150's.
I know the 6.0 sounds kinda normal, but the 6.4's sound more like the gear reduction starters ive had on race cars.

 

I'm subscribed to see the outcome, as I have always wondered why the newer diesels (from both GM and ford) turn over so fast compared to their predecessors. I was checking out a 2015 6.7 truck the other day and you barely have time to release the key before the engine is already running.


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Just to add to it......looks like a 6.7 starter will bolt up too lol.

 

Ive thought about that.....the 6.4 is 17.5:1cr and the 6.0 is 18.0:1 that shouldnt make too much difference. Maybe the flex plate is a different size. Idk ill probably try the starter if they dont want too much for it.

 

why not rebuild your starter? if its not toast, Bushings, brushes and some grease. Not sure what else is in the diesel starters, but I have never bought a new or used starter, I always rebuild.

 

6.0's have always cranked slower than 6.4's.


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My dad's Dodge turns over like the hulk is spinning a Honda 1.8 liter motor.

He had a 05.5. I'd match starting my truck to our 90s Ford tractor and like 02 dozer. His is also common rail to I think

 

Hhhm, I didnt think about the hpop slowing down the starter on the 6.0, could possibly have something to do with it.

 

I always thought it was because the 6.4 is a common rail and fuel is hitting the injectors quicker, on the hpop engines oil pressure has to build in order to get the injectors going, hence the longer start time. Somebody correct me if I'm wrong, but that has been my understanding.


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Yea but im not experimenting with crank time as much as crank speed.

 

6.4 starter is in hand.

 

It's been 20 min since you posted the pic, details man! LOL

 

Its still in the back of the truck lol. Ill put it on the lift tomorrow or friday to swap it out. I gotta make sure it works and clean it first too.

 

Yeah 150-160 is in the normal range for a 6.0. I put a new starter in a 6.7 last week and it was hitting 195 right before it fired.

I know mine cranks a little slow but the batteries are strong and the cables are good. It's the starter for sure but I don't have the heart to just toss out a starter that's still actually working. I think all it would take is about 10-15 seconds of cranking to kill it though.

The 6.0 I put heads on last week was doing a steady 180 while I was trying to build oil pressure, oddly enough it was a NAPA starter too. You work on enough you start noticing how some of these things crank different than others

 

Alright girls, the install was a success!
Videos uploading now.

 

It went right in and went from 150 ish to 220 ish....Videos.
6.0 starter Crank: 6.0 starter Crank - YouTube
6.4 starter in 6.0 crank: 6.4 starter in 6.0 crank - YouTube
6.4 starter in 6.0 start: 6.4 starter in 6.0 start - YouTube

 

Hi. In the first 2 vids, how did you get it to crank but not start? Did you pull the fuel pump fuse or something?

Thanks!

 

HAHA! Holy crap! Big difference.

 

Ive been using 6.4 starters for a couple years now. My truck fires off fast


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What a great idea you had. That motor really cranks fast now. It starts like instantly, spinning that fast.

Are the starter dimensions any different other than what is in the housing?

I always put the top bolt in the starter before I put it in place for an easy bolt up, so if the dimensions are the same a person could do the same with this starter.

Thanks for the idea.