4.10s installed! (Yeah there have been a lot of these threads!)

[StevenJ]

I know I know everyone and there mother got 4.10s in there car but I just got mine installed so let me have my fifteen minutes!

1. It makes the car much much much better on the highway. Passing people in over drive is a sinch. You rarely need to down shift to third.

2. Doesn't seem to affet gas millage much if at all.

3. It does an awsome job of keeping the car in the optimum RPM range.

4. There is however driveline shock. If you get up to 85 and push the gas, there is a fairly strong kick when the torque convertor unlocks. I'm still thinking if I should go to a driveline shop to have my driveshaft perfectly balanced. That can wait though.

I only drove 60 miles with them installed so far. Oh yeah, I had the T/A performance cover and stud and girdle kit put on too. I had the guy who installed them throw out the old cover. Well that's all for now.

PS> Thank you RoyLPita for getting me that appointment with your friend to do the labor. He did an awsome job on the installation and I had no problems with gear whine. :D

Also, thank you Wes for providing the parts and the free shipping!

[RF Overlord]

I know I know everyone and there mother got 4.10s in there car but I just got mine installed so let me have my fifteen minutes!You got it! Congrats on your new-found power... :D


I'm still thinking if I should go to a driveline shop to have my driveshaft perfectly balanced.Don't bother. If you can't feel any vibration then your DS is not out of balance.

The problem with the Marauder DS and 4.10 gears isn't a matter of balance, it's a matter of stiffness (insert lame sexual innuendo here :rolleyes: ). Read this (http://www.mercurymarauder.net/forums/showthread.php?t=5163) article before you spend money having your stock DS "balanced".

[SergntMac]

Ditto RF...Congrats. If you are intent on balancing the driveshaft, please let us know what you discover?

[StevenJ]

I don't know if I want to get the Reinhart d/s. The MMX is okay, I'm sure but for the money, I'd rather just spend a bit more and get the winston cup driveshaft the Car and Driver Project Lounge Lizard uses. Or the one your Kenny Brown has Sergent.

[SergntMac]

I don't know if I want to get the Reinhart d/s. The MMX is okay, I'm sure but for the money, I'd rather just spend a bit more and get the winston cup driveshaft the Car and Driver Project Lounge Lizard uses. Or the one your Kenny Brown has Sergent. My Kenny Brown #1x has the Metal Matrix Composite (MMC) driveshaft, red over white "DynoTech" decal and all, which is exactly the same driveshaft offered and sold to us by Dennis Reinhart.

The "Metal Matrix Experimental" (MMX) driveshaft is Ford's label for the same driveshaft. Ford named the problem and DynoTech solved it, and picked up a retail market from there. All Dennis did (later down the retail road) was become a DynoTech dealer, and make this special custom driveshaft available to us common and usually out of reach owners.

Kenny Brown got his "WC" driveshaft from Ford because his CV based 2V SOHC Roots based "Lounge Lizard" discovered/documented this driveshaft "whip", and it went public from there.

I don't know if you need this upgrade, I've never been sure anyone has "needed" it. From day one (and through 3 Marauders now), my position has been that you need to discover a "whip" problem first, then consider this MMC driveshaft as a quick and accurate repair.

Therefore, if you have a driveshaft vibration issue, this will cure it. But, I'll tell you now, that it's not a "balance" issue, it's really more like metal coming apart under high revolutions, what Ford calls "whip."

This is why I asked you to wait, watch, feel it first and keep us posted.

But, I know for sure, that just "balancing" the OEM driveshaft in a contemporary way does not cure anything. Once you see tranny fluid leaking from your tranny tailshaft, or, rear end lube leaking from your pinion seal, you got "whip", dude.

[Cobra25]

Congrats on your install. Glad every thing went well.

[StevenJ]

Oh gee, thanks for making me feel better Sarge! j/k No whip so far. I test drove the car up to 99 mph for good measure. Some minor vibration, no leaks yet. One complaint though and this probably has to do with the breakin more than anything. If I drive the car hard, giving it 80% - 100%, after I come to a stop, I get this moaning sound. It's temporary. It goes away after about two minutes. I think it's because the gears still need more time to fully break in. I didn't do anything crazzy with it, just maybe a few seconds of full throttle and that was it. Oh yeah, the 4.10s make slick roads a lot more fun :D I whipped the tail out a few more times than I would have liked too but yeah. Oh yeah, gas millage seems better with 4.10s than 3.55s! Call me crazzy but if I can keep the urge away from driving past 3000 rpm, it can get 18-19 city from what I have seen so far. Highway is a tad worse but to be excepted. I do 78% city driving anyway.

*Edit, I read the article posted earlier in this thread before buying the gears. I didn't quiet fully comprehend it but I got most of what it was saying. And I think you mean Dynotech, not Dyna! They sell headers, not driveshafts! http://www.dynotechengineering.com/

[SergntMac]

Spell check complete! Thanks!

[RoyLPita]

Congrats on your install. Glad every thing went well.

Glad to be of help. Thanx for your patience in getting the job done.

[jstevens]

For what its worth, I experienced vibration at 110mph before my Nos install. Lidio offered a balanced driveshaft exchange which I did.

Now I've taken the car up to 120 with not a hint of vibration.

[SergntMac]

I know I know everyone and there mother got 4.10s Yep...But not everybody gets vibration, it's different from car to car.