I have a 2013 Shelby GT500 with the Performance Package. The problem is that it's "stuck" in Sport mode.
- Thread starter MustangSteve1965
- Start date
It happens even if you launch on 3.31s
If the gear swap is done with a solid spacer it’ll take that even better than stock.
-J
If the gear swap is done with a solid spacer it’ll take that even better than stock.
-J
It does not always happen on 3.31s. I've launched mine ~35 times and I have zero gear whine. (That's why I'm reluctant to screw with it.)
Good to know about the spacer - thanks.
Launched on a prepped drag strip? Mile runs (while awesome and Indiana 1/2 on my bucket list) don’t really count here. Why would the ratio matter to that effect? It doesn’t. I’ve had 3.31/4.10/3.73/4.10s all in the car and the 4.10 solid spacer lasted the longest. This is with drag strip use. Street and top speed events won’t be difficult for a well set up gear of any ratio.
SAI puts 3.73s in the SS cars?
-J
I'm surprised you're missing the point. A launch is a launch. Doesn't matter how far you're racing after launching. The ratio doesn't matter either. The issue is an aftermarket setup that may or may not have been done "right" (whatever that means) replaced the OEM gears. Those OEM gears continue to function quietly, for me, after ~35 race passes. I know other local Shelby owners who've launched at 1/4-mile, 1/2-mile, and 1-mile events on OEM gears with similar results. I also know local Shelby owners who've launched at 1/4-mile, 1/2-mile, and 1-mile events on aftermarket gears that went from quiet to whining after less than a handful of launches. I'm aware that SAI offered 3.73 gears in their SS conversions, though I'm not sure what that has to do with the discussion.
My point, for the record, is that I've heard and read multiple reports that screwing with the OEM rear gear setup resulted in a rearend that whined following hard launch. To date, my OEM setup has not done that. I am, therefore, reluctant to replace my OEM 3.31s with 3.73s (I'd rather have) for fear the new setup may whine (which I do NOT want). I'm intrigued, however, by your report that use of a solid spacer can prevent the problem.
I can personally attest.......never.......even after a launch have I had any gear whining from the rearend W/ 3.73 gears. Mine were installed at SAI.
Steve I don’t understand your misunderstanding. A launch on Michelins at the Colorado Mile would not expect to stress the 8.8 and gear preload like a car with drag radials on a prepped drag strip.
So we can agree to disagree but I think you’re blinded by guys who have had poor installs.
-J
Maybe we're in violent agreement? (I agree with what you said here.) Your previous post seemed to say the gear ratio and length of race played a part in whether whine developed, which left me scratching my head.
You may be right about poor installs, but there seem to be a lot of them. Right or wrong, that leaves me apprehensive about making the switch.
Were the owners with gear whine running " Ford " gear sets ?
Was the installer's main business building & maintaining race cars ?
.
Was the installer's main business building & maintaining race cars ?
.
Yes.
I don't think so, but their main business was/is differential service and repair.
Those 3.73's are calling for you Steven.....you will thank us all later....it will take the unicorn to another level my friend.....
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I was gonna post last night; but it has been covered
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@Norton , you are not alone.
My ‘12 GT500 had the 3.55 gear. Bone stock & the gear felt ok, not too low, not too high.
When I got the ‘13 the 3.31 gear felt obviously higher but so did the extra power.
I thought briefly about dropping the gear but like you I started hearing the gear whine stories so I just left it alone.
My car only has 6k miles, and no whine. I’ve not done 6 grand clutch dumps but it’s been “launched” many times after full clutch release.
I’ve grown accustomed to how much ground I can cover @WOT in 1st and 2nd gear.
I have no plans to drop the gear at this point. I like the way it performs as is.
My ‘12 GT500 had the 3.55 gear. Bone stock & the gear felt ok, not too low, not too high.
When I got the ‘13 the 3.31 gear felt obviously higher but so did the extra power.
I thought briefly about dropping the gear but like you I started hearing the gear whine stories so I just left it alone.
My car only has 6k miles, and no whine. I’ve not done 6 grand clutch dumps but it’s been “launched” many times after full clutch release.
I’ve grown accustomed to how much ground I can cover @WOT in 1st and 2nd gear.
I have no plans to drop the gear at this point. I like the way it performs as is.
So, unfortunately Lidio is not going to be able to do my rear end because he's going to be laid up for about a month.
He strongly recommended DTS (Drive Train Specialists) on Groesbeck over in Warren. Is anyone familiar with their work?
He strongly recommended DTS (Drive Train Specialists) on Groesbeck over in Warren. Is anyone familiar with their work?
Yes. Great shop.
-J
Great, thank you.
Picking up the Shelby today from Lidio and taking it there right after.
Let us know what they say.
You should have a quality Torsen differential and probably just need gears (ring and pinion ) and new bearings. That’s why I’d highly recommend going 4.10/ 3.73
Again don’t fear the gear, 4.10s and drag radials make for a killer combo at that power level.
-J
I took it to DTS and after one guy telling me to drop it off and though they're busy they should get to it in 5-8 business days, the guy behind the counter said October 4th. Was also a total dick about it and he doesn't know why the other guy said that and acted all incredulous. I just said, I'm telling you what I was told and if you don't want to do it, fine. He said no, bring it in October 4th but by then hopefully Lidio is back in action and I'm just taking it to him. Screw DTS. I guess they have enough money.
Shelby owners always get treated like that.
Unless you have tattoos running up your arms like me. Than they don't frog up as much.
Unless you have tattoos running up your arms like me. Than they don't frog up as much.
Sorry to hear man.
Maybe it’s a day job that is booked out 4wks?
Either way Lidio will take care of you.
-J
Maybe it’s a day job that is booked out 4wks?
Either way Lidio will take care of you.
-J
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