Rear End Fluid Change - Mustang Evolution

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Old 12-01-2014, 03:32 PM   #1
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Rear End Fluid Change

So i got my 4.10s installed bout 800 miles ago, the shop told me to have the fluid changed after the break-in period which was 500 miles. I dont feel like dropping the girdle, can i just pump out the fluid used to break them in and pump some new fluid?

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Old 12-01-2014, 05:05 PM   #2
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Yes you could, try to get all of the fluid out.


Is there a drain plug?
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Old 12-01-2014, 07:09 PM   #3
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There is no break in period for Ford gears. If they are making any sort of noise whatsoever the shop messed up and they need to be fixed and probably need a new install kit. Hopefully this is not the case.
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Old 12-02-2014, 12:19 AM   #4
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Its either pump it out, or remove the girdle, but i know of one more person that never replaced the fuild either.
Scotty, there is no sound, actually are great. But the shop didnt use the royal purple gear fluid that came with the Gear kit. They said to save it until the oil change. I took it to a reputable rear end shop for the install since i didnt want to mess it up myself

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Old 12-02-2014, 04:24 AM   #5
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They should have used the Royal Purple...as scottyknows stated, the Ford gears do not require a break in, and any reputable shop would know this I'd say.

When I had mine done (by Ford) I had them install a Boss cover that had a drain and fill plug, plus the TSP mod for adding the "turkey baster" vent tube. If you are hard on the rear end, it can vent gear oil out the stock vent valve (on drivers side of axle). Keep an eye out on this part of the axle for wet marks.
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Old 12-02-2014, 07:16 AM   #6
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I'd just leave it then... I mean find out what they used but if its a good rear end fluid don't mess with it and leave the RP on the shelf for a routine fluid change in 20-30k miles.

And I agree with Bucko, if they were that reputable they'd know Ford gears are install and go, no need to break them in. The last time I had someone install a set of gears was a set of Ford 3.73s new in the box from the dealer and I thrashed the living **** out of them the very first pull coming out of the shop. Never heard a single peep from them.
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Old 12-02-2014, 10:14 PM   #7
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Right on, thanks bucko & scotty ill just save the fluid and keep beating on these gears.

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Old 12-08-2014, 09:02 PM   #8
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So how dose your car do on the highway? I'm considering 4.10s.

Thanks.


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Old 12-15-2014, 01:10 PM   #9
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It's not my daily so it doesn't bother me on the freeway. But the Revolutions are a little up in the 28000 rpms in OD with the car going 65mph. I don't avoid the freeway, but do enjoy driving it a lot more around town since the re-gearing.


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Old 12-15-2014, 03:36 PM   #10
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All depends on what year car you have and your overall tire diameter out back. Google "RPM" calculator and punch in the info you want. Stock tire diameter is 25.7" and final gear ratio is going to be .68 for 5 speeds and .70 for autos. Figure 25-2600 rpms on the highway with 4.10s and a T-5 doing 65-70mph.
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Old 12-16-2014, 04:09 AM   #11
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Scotty is right, or latemodel has a calculator for you before choosing your tooth. I believe you are right on point, It's been a good 4 months since my last drive. I think it was 25-26 rpm at 65mph


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