4.10 gears pre-sale question - Mustang Evolution

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Old 05-31-2013, 11:57 AM   #1
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4.10 gears pre-sale question

Hey guys so my rear diff has had a slight leak so gives me an excuse to buy some gears. I'm on AM and the highest they go is 3.31 for a 99 cobra. I called and asked about their combo kit for 86-04 v8 and they said it won't fit. So what other places do you recommend to buy gears at thanks
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Old 05-31-2013, 12:13 PM   #2
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Lethal Performance probably has a set.
If they don't, check Stage 3 Motorsports.
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Old 05-31-2013, 12:14 PM   #3
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Hey guys so my rear diff has had a slight leak so gives me an excuse to buy some gears. I'm on AM and the highest they go is 3.31 for a 99 cobra. I called and asked about their combo kit for 86-04 v8 and they said it won't fit. So what other places do you recommend to buy gears at thanks
I thought it was the same diff, just different axle.
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Old 05-31-2013, 12:17 PM   #4
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Lethal Performance probably has a set.
If they don't, check Stage 3 Motorsports.
Kool thanks
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Old 05-31-2013, 12:18 PM   #5
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I thought it was the same diff, just different axle.
Well the tech on the line said they won't fit, the combo kit just goes up to 98 cobra
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Old 05-31-2013, 12:25 PM   #6
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Ok so I have the gears added to my cart, now should I get the ford racing ring gear and pinion installation kit as well? My rear diff is leaking
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Old 05-31-2013, 12:28 PM   #7
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I would
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Old 05-31-2013, 12:54 PM   #8
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Alright added the kit to the cart
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Old 05-31-2013, 01:28 PM   #9
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Well everything is ordered now. Gotta play the wait game
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Old 05-31-2013, 01:30 PM   #10
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I saved about 80 bucks with stage3. They priced matched and have free shipping! They are great and I highly recommend them! Thanks for that info BackPressure!
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Old 05-31-2013, 01:32 PM   #11
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Do you think that you'll have them installed by next weekend?
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Old 05-31-2013, 01:45 PM   #12
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Do you think that you'll have them installed by next weekend?
I hope I do. Wonder how long it will take for them to get here. If I can get them in by Friday then yes I will be able to go on Sunday
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Old 05-31-2013, 02:02 PM   #13
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I hope I do. Wonder how long it will take for them to get here. If I can get them in by Friday then yes I will be able to go on Sunday
You might want to order a set of clutches for the limited slip while you have it apart. They're easy to slap in there. Your car doesnt have many miles on it but they're relatively inexpensive...
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Old 05-31-2013, 02:06 PM   #14
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We're do I get them and what are their purpose? I believe I need to get some liquid as well correct
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Old 05-31-2013, 02:13 PM   #15
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Yes. Oil also. The clutches are in the differential to allow the wheels to turn independently when going around corners. Ford racing has some replacement kits and a Kevlar upgrade I believe. Assuming that it still has the trac-lock in it of course.
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Old 05-31-2013, 02:19 PM   #16
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What oil did you use? Ill see if AM carries them
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Old 05-31-2013, 02:23 PM   #17
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Don't for get the friction modifier when you order fluids. I think parts stores carry it too.
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Old 05-31-2013, 02:26 PM   #18
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Im not sure what they used in mine. I dont have the trac-lock anymore. The OM recommends Motorcraft 75W-140 synthetic rear axle lubricant. 2.0 litres (4.25 pints)
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Old 05-31-2013, 02:30 PM   #19
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Alright ima go ahead and do some research on that and the liquids.
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Old 05-31-2013, 04:50 PM   #20
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Don't for get the friction modifier when you order fluids. I think parts stores carry it too.
+1,000!!
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Old 05-31-2013, 04:57 PM   #21
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What exact fluids and how much do I need. Thanks!
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Old 05-31-2013, 09:56 PM   #22
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Ok. I looked in my repair manual and I think the info I gave you out of the owners manual is wrong. It says in the repair manual to use SAE 80W-90 GL-5 gear oil. Doesnt say to use synthetic like the owners manual but I would use synthetic. As far as the friction modifier, it says to add 4 oz. I usually go with the lightest weight oil possible . We don't really need the heavy viscosity in our climate. Capacity is a little less than 2 quarts. And 4 oz. Friction modifier. You can get it at any auto parts store. Sorry for the confusion...
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Old 06-01-2013, 03:26 AM   #23
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Ford updated the fluid spec to 75w-140 in the 8.8 rear ends years ago. Its pricey but oh well. Mobil 1 synthetic stuff from the local box parts store blah blah blah.

As for the gears, I'd make a post on an AM vendor section about the idiot rep you talked to. An 8.8 is an 8.8 at least in a Mustang. Any 8.8 gearset will work in any year that came with one. You can pull a 3.08 ring and pinion out of a 95 Cobra, for example, and toss it in a 2002 GT if that is your cup of tea.
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Old 06-01-2013, 04:10 AM   #24
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Ford updated the fluid spec to 75w-140 in the 8.8 rear ends years ago. Its pricey but oh well. Mobil 1 synthetic stuff from the local box parts store blah blah blah.

As for the gears, I'd make a post on an AM vendor section about the idiot rep you talked to. An 8.8 is an 8.8 at least in a Mustang. Any 8.8 gearset will work in any year that came with one. You can pull a 3.08 ring and pinion out of a 95 Cobra, for example, and toss it in a 2002 GT if that is your cup of tea.
Cool thanks for the info! So 75w-140. How many quarts? On their website for 99-04 cobra the highest gears they have are 3.31. When I talked to him he said nope won't work.
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Old 06-01-2013, 11:27 AM   #25
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Ford updated the fluid spec to 75w-140 in the 8.8 rear ends years ago. Its pricey but oh well. Mobil 1 synthetic stuff from the local box parts store blah blah blah.

As for the gears, I'd make a post on an AM vendor section about the idiot rep you talked to. An 8.8 is an 8.8 at least in a Mustang. Any 8.8 gearset will work in any year that came with one. You can pull a 3.08 ring and pinion out of a 95 Cobra, for example, and toss it in a 2002 GT if that is your cup of tea.
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Old 06-01-2013, 11:30 AM   #26
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Well everything is ordered now. Gotta play the wait game
You must trust everyone on the Internet with your address and phone number.
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Old 06-01-2013, 11:36 AM   #27
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Actually the adress is wrong lol. I placed the order over the phone and they wrote it down wrong. So I had to call them back to fix it
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Old 06-01-2013, 12:28 PM   #28
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I wonder if you will need to shift up to third at the autox with 4.10's or if second will be perfect. I hope you get it all installed in time for the next event.
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Old 06-01-2013, 01:28 PM   #29
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Cool thanks for the info! So 75w-140. How many quarts? On their website for 99-04 cobra the highest gears they have are 3.31. When I talked to him he said nope won't work.
It should be right around 2 quarts. And 4 oz. of friction modifier. I use the lower weight oil to reduce friction loss. Im guessing that they changed the weight recommendations to quiet down the rearend. Either weight will work fine. Your call...
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Old 06-01-2013, 02:34 PM   #30
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I wonder if you will need to shift up to third at the autox with 4.10's or if second will be perfect. I hope you get it all installed in time for the next event.
I don't think so, when I'm in 2nd I usually don't go any higher than 5k rpms. Yea me too can't wait!
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Old 06-01-2013, 02:36 PM   #31
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It should be right around 2 quarts. And 4 oz. of friction modifier. I use the lower weight oil to reduce friction loss. Im guessing that they changed the weight recommendations to quiet down the rearend. Either weight will work fine. Your call...
Alright kool thanks for the info. Ima go ahead and see if my local auto parts store sells royal purple for the rear end
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Old 06-01-2013, 08:23 PM   #32
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I have never autox'd or road raced but from what I understand having seen some track events and talking to ppl, if you want to road race ever you need lower gears. Hell some guys get 2.73s that ppl are giving away and put them behind big power engines for road racing. For autox... you never really get going that fast but you do need to look at when you are shifting and if going into a higher gear when someone else with a lower gearset would not have to shift would hurt you or not. Drag racing is one thing, yes the super high gears like 4.56s are great for some ppl. But you have to get it to work with your combo.
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Old 06-01-2013, 08:54 PM   #33
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The track that we run on is on an ex army airfield. The ramp they used for helicopters. Its good sized but not huge. I havent had that much experience there but its not really large enough to set up any long straightaways. Its really just pick a gear to run the whole course in. No shifting. My car has the 3.27's and I can definitely see were a higher numerical ratio would be a benefit. I run in second and it gets a little sloppy getting back into the power band around tight hairpins. My car is a freeway cruiser right now so Im leaving the gears and just deal with it on the auto-x. I hear ya on the road racing thing though. I like the longer legs...
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Old 06-01-2013, 09:08 PM   #34
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I like the longer legs too, I've still got the original 3.08s from my 95 Cobra, the last part of that car I have left (tear) and when I do the Tork Tech and IRS to my 98 they are going in there for highway cruising and because I'm setting it up for road racing.

As for what you are talking about... for that sort of autox even a super high gear like a 4.30 or 4.56 might be really good and learn to heel/toe 2nd to 3rd.
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Old 06-01-2013, 09:13 PM   #35
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I suspect some cars running out there are into the 5's...
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