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Old 06-05-2015, 10:57 AM   #141
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Yeah, i have a GT500 3.55 axle straight from ford in Valerie's V6 and it has a noise you can hear. Really just turning the radio on is enough to easily drown it out, but the 3.73s we had in her auto were intrusive. Thats also a very small range, hers were audible over a good 15 mph difference, so itd say you're cool man, unless its just annoying.
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Old 06-05-2015, 11:04 AM   #142
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Awesome. Once again, your sage advice is comforting. Can't wait until my break in period is done so I can see what these gears and rear LCAs can do.
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Old 06-05-2015, 11:08 AM   #143
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Stock 3.31's and I can hear gears when back seat is down. When it's up its harder to hear but it's still there. Your just making it a point to listen. Also another thing to consider is that it's not the gear set but a wheel bearing.


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Old 06-05-2015, 11:10 AM   #144
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Did you put the 75W 140 back in? I was going to say a different fluid may be able to mask some of the sound. Maybe an Amsoil or redline fluid as opposed to the Ford Factory fill, but i personally have no experience on that, i just know sometimes it works in transmissions.
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Old 06-05-2015, 11:16 AM   #145
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I put Royal Purple 75w 140 and the shop added Ford Friction Modifier on top of that. I am going to flush the fluid in another few hundred miles. The shop tech also mentioned these gears and components have a coating on them that wears off during the break in cycle.
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Old 06-05-2015, 02:09 PM   #146
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Well I think this topic has been beat to death on other threads.....I guess every shop does it different.


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Old 06-05-2015, 02:14 PM   #147
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Yup, now even though with Royal Purple it says you dont need additional Friction Modifier. Do you suggest to still add it?
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Old 06-05-2015, 02:16 PM   #148
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Did not use synthetic for break in...after 500 miles drained and added Mobil 1.


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Old 06-05-2015, 02:18 PM   #149
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Ahh. I used RP 75w 140 for break in since it came with the gear kit. Is that bad?! :O What should I use after?
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Old 06-05-2015, 02:23 PM   #150
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I've heard lots of different things. My shop used standard ford rear end gear lube for 500 miles, then drained it and put in mobil 1....which is a synthetic! I have heard of only 1 person on here that had issue and it was not related to the gear lube. Putting standard in FIRST, also keeps the cost down as it was drained and discarded! I'm not a mechanic, so just follow your shops advice!


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Old 06-05-2015, 02:25 PM   #151
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Ok. That is what I did and they were even glad I got Royal Purple. which came with the gear kit anyways.

You had me sweating there for a second....
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Old 06-05-2015, 02:25 PM   #152
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^^ I think its mostly cost. When i was breaking in my last motor i was using $10 jugs of penzoil lol
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Old 06-05-2015, 02:28 PM   #153
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^^ I think its mostly cost. When i was breaking in my last motor i was using $10 jugs of penzoil lol

LMFAO! I put that in my 3000GT and an old friend I had that was an automotive tech almost slapped me. Said never to use that for serious purposes. I can understand the cost though for quick break-in and flush scenarios.
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Old 06-05-2015, 02:32 PM   #154
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Well they included the regular ford gear lube for the gear swap(400.00 outstanding price). Then charged me 40.00 to drain it and refill it! I furnished the Mobil 1.


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Old 06-05-2015, 06:31 PM   #155
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As far as my earlier question about the Pinion load. The range to set it is 16-28. So 20 is within spec. I wonder why it would make noise if everything is within spec and it has the right fluids. I guess an aluminum driveshaft doesn't help. And maybe once a wear pattern sets in and the fluid is drained it may be better. Idk, it is just annoying. LOL
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Old 06-05-2015, 10:42 PM   #156
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When did you put in the rear LCA's? They have poly bushings which may be transmitting more noise than stock rubber ones. Just a thought.
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Old 06-05-2015, 10:59 PM   #157
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I thought of that also. That coupled with the driveshaft, I guess I was asking for trouble. Lol.

I got the LCAs put in the same time as the gears.
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Old 06-06-2015, 11:57 AM   #158
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That's way to much for install. $300 max I would understand. Congrats on your purchase, but I suggest checking around some more. This is a simple install for any axle company. Don't let someone talk you in to believing mustangs have some sort of special axle when it's not a ford product in the first place. Just my two cents


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Old 06-06-2015, 02:45 PM   #159
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I did call around. Not many places would even touch an install like this in Austin.
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Old 06-06-2015, 02:47 PM   #160
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I paid $600, that included the gears, Royal purple and taxes.

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Old 06-06-2015, 05:13 PM   #161
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Same. If the labor costs too low, i would question the work...
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Old 06-06-2015, 05:23 PM   #162
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I've never used and will never use synthetic gear oil for any break in, gears or engines.
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Old 06-06-2015, 08:15 PM   #163
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Man, that sucks. Got mine 3.55s install for $250 and I felt like I over paid at the time compared to the prices I was hearing in Houston


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Old 06-06-2015, 08:37 PM   #164
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Well, the more people that can do the work in your area, usually the cheaper prices there are due to competition for business. But if the shop knows noone else can do it, they will make up their own price.
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Old 06-07-2015, 07:14 PM   #165
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Steeda did a great job on mine.... out the door was about $650, including everything and tax.
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Old 06-07-2015, 07:25 PM   #166
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That is about what I paid. Seems the normal pricing, parts and labor, rounds out to around 600-650.
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Old 06-07-2015, 08:12 PM   #167
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Have you looked at Lethal I believe in New Braunfels? Not sure if you have it installed already.
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Old 06-07-2015, 08:48 PM   #168
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Yea they are already installed. Getting fluid flushed on the 16th as I will finish the break in period around that time.
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Old 06-08-2015, 06:39 PM   #169
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So what have you noticed your fuel mileage to be around
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Old 06-08-2015, 06:50 PM   #170
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Actually. The mpgs stayed the same. The funny part is when i filled my tank up, it would say about 295 miles till E. Now even though the avg mpgs are the same, it says like 330-340 miles till E. Funny stuff.
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Old 06-08-2015, 08:35 PM   #171
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Actually. The mpgs stayed the same. The funny part is when i filled my tank up, it would say about 295 miles till E. Now even though the avg mpgs are the same, it says like 330-340 miles till E. Funny stuff.

I'm assuming you retuned for the new gears. Every time you tune, it resets all those metrics and takes a few for it all to catch back up to normal again.


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Old 06-08-2015, 08:38 PM   #172
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Yea. This was after refueling at ~150 miles after retuning. So idk if that matters.
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Old 06-08-2015, 08:39 PM   #173
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Actually. The mpgs stayed the same. The funny part is when i filled my tank up, it would say about 295 miles till E. Now even though the avg mpgs are the same, it says like 330-340 miles till E. Funny stuff.
Wait until the break-in is over, mpgs should drop nicely.

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Old 06-08-2015, 09:14 PM   #174
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Lol i know! I wonder if the gears will wear down enough that the howl will just go away after a few thousand miles.
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Old 06-08-2015, 09:23 PM   #175
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Lol i know! I wonder if the gears will wear down enough that the howl will just go away after a few thousand miles.

Do not let them break in over a few thousand miles because they won't stop howling but instead they will get a even louder howl. If the shop said they are in spec then what I think is it could just be the gear set which you purchased. I would get a second opinion from some other shop also.


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