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Which rear end???

5027 Views 13 Replies 5 Participants Last post by  KR2018, 
M
I’m just curious which rear end is in these trucks with the 3.0? My 5.0 and 2.7 had the 8.8”, but most of the 3.5 EBs I’ve seen had the 9.75” rear.
I haven’t even looked yet, but it’s late and I’m curious. LOL
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S
I researched* this quite a bit on f150forum looking for verification that all 9.75 rear ends are 3.73/1 and all 3.73/1 are 9.75 and I could not find a counter example for the gas engines. Each time I build a truck with a 3.0 on Ford.com I cannot chose 3.73 ratio; if the data for the gassers hold, then all diesel engines have an 8.8 inch rear end.

*by research I mean I solicited input from the forum crowd. I read the sales guides too, but couldn't find a black and white answer, thus all that I have is anecdotal.
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W
8.8 on left / 9.75 on right. They both have 12 bolts. You can tell you have a 9.75 by the shape.

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W
My truck has the 9.75
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L
My truck with the 3.55/1 electronic lock axle has the 9.75 rear end.
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S
Wow, good to know!


How the heck does someone ensure that he would get the 9.75, then? They are both fine, but if a person expected one versus the other it would be unfortunate to be surprised/disappointed on delivery day.
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snowshew said:
Wow, good to know!


How the heck does someone ensure that he would get the 9.75, then? They are both fine, but if a person expected one versus the other it would be unfortunate to be surprised/disappointed on delivery day.
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I doubt the 3.0 comes with anything but the 9.75, but be sure to ask dealer!
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According to this 8.8 not even used anymore. Everything is the 9.75

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M
Mine has the 9.75”

Mine does have the 9.75, but I’m pretty sure the 5.0 I was looking at had the 8.8.

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S
Hello,


Slightly hijacking this thread I suppose, but it is a similar topic.




I'm trying to decide on a gear ratio, and since I won't be able to test drive each under various conditions (towing, highway cruising, etc.) I am wondering if there is a consensus on which one is best. The most I will pull is 7500 lbs. and I am fine with locking out 10th or 9th if I need to, or if the transmission moves around a bit under that kind of a load, however, when not pulling I would prefer the truck hold in 10th as much as possible on the highway. I rarely go faster than 70, but don't want to have the engine at faster than needed on the highway, either.


Basically would either ratio serve me fine, or if I were to err to one side or the other, which one should it be?


I am leaning towards the 3.55 but I am coming from V8s where the revs were more beneficial.


Thanks,
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snowshew said:
Hello,


Slightly hijacking this thread I suppose, but it is a similar topic.




I'm trying to decide on a gear ratio, and since I won't be able to test drive each under various conditions (towing, highway cruising, etc.) I am wondering if there is a consensus on which one is best. The most I will pull is 7500 lbs. and I am fine with locking out 10th or 9th if I need to, or if the transmission moves around a bit under that kind of a load, however, when not pulling I would prefer the truck hold in 10th as much as possible on the highway. I rarely go faster than 70, but don't want to have the engine at faster than needed on the highway, either.


Basically would either ratio serve me fine, or if I were to err to one side or the other, which one should it be?


I am leaning towards the 3.55 but I am coming from V8s where the revs were more beneficial.


Thanks,
Click to expand...
Get 3.55 hand down, no questions asked. I wish I did. I dont tow, but I want it sometimes on the freeway.
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S
Thanks,
Are you saying that at highway speeds the transmission will shift down to 9th on inclines etc.? I am assuming (but don't know) that first is plenty low, especially for this motor, when starting from a stop, towing or not. But, again, no firsthand experience.
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snowshew said:
Thanks,
Are you saying that at highway speeds the transmission will shift down to 9th on inclines etc.? I am assuming (but don't know) that first is plenty low, especially for this motor, when starting from a stop, towing or not. But, again, no firsthand experience.
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I have 3.31s and 35s and yes it does, even did it before I put bigger tires on. Its really not a big deal it down shifts as its still locked in OD, but its more the fact you are loosing speed to other drivers and have to give it a little pedal to kick down and go.


Dude you have ZERO to worry about from a stop, SOOOO much Torque. Its keeping it going thats the problem for this 3.0.

Get the 3.55s.
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K
You know you can just use the + and- on the gearshift to select your highest gear available.

I use it to lock in hilly areas to keep it from shifting, etc.


Works in both Manual and Drive mode.
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