Rear end setup recommendations. - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 24 Old 11-18-2017, 03:46 PM Thread Starter
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Rear end setup recommendations.

I've been running a Ford Traction lock until last night. Something broke in my rear end, but it wasn't the axles. Looking for something better that will hold up. May as well upgrade since I have to go in.

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post #2 of 24 Old 11-19-2017, 12:13 AM
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spool it

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post #3 of 24 Old 11-19-2017, 01:02 AM
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And there you go! Spool it, stud it, and cover it.
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post #4 of 24 Old 11-19-2017, 09:51 AM
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Hey.
Is this a street car or track car?
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post #5 of 24 Old 11-19-2017, 11:06 AM Thread Starter
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Hey.
Is this a street car or track car?
Both, but mainly track. Been thinking of running it in true street next year

Was looking at this.

https://www.summitracing.com/parts/dtl-913a561

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post #6 of 24 Old 11-19-2017, 11:25 AM Thread Starter
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spool it
What's up Steve? What's in your car?

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post #7 of 24 Old 11-19-2017, 05:24 PM
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If it is almost always track, spool. If it is a mix consider a real good differential like a Wave Trak style or the best you can buy. I've had three wave trak (or however they are spelled) and they are awesome. Totally quiet, smooth, no surge turning, and they always lock both wheels. They handle a ton of power in the 33 spline model.


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post #8 of 24 Old 11-19-2017, 05:57 PM Thread Starter
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If it is almost always track, spool. If it is a mix consider a real good differential like a Wave Trak style or the best you can buy. I've had three wave trak (or however they are spelled) and they are awesome. Totally quiet, smooth, no surge turning, and they always lock both wheels. They handle a ton of power in the 33 spline model.
So you dislike the Eaton Detroit Trutrac that I posted the link about?

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post #9 of 24 Old 11-19-2017, 07:16 PM
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So you dislike the Eaton Detroit Trutrac that I posted the link about?

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I don't dislike any posi unit for racing except 28 spline stock units. I've used everything from weak 28 spline Fords to 40 spline spools. You really have to pick something that fits your budget and abuse.

A 31 spline truck posi with restacked clutches will work about as well as a 31 spline TruTrac. The best posi's I have ever used however are the gear type posi at this link.

They are a little pricey but they are awesome if you want a differential that always works seamlessly and handles power. I think that is the best posi made by far. I even put one in my Super Duty truck.
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post #10 of 24 Old 11-19-2017, 07:20 PM Thread Starter
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I don't dislike any posi unit for racing except 28 spline stock units. I've used everything from weak 28 spline Fords to 40 spline spools. You really have to pick something that fits your budget and abuse.

A 31 spline truck posi with restacked clutches will work about as well as a 31 spline TruTrac. The best posi's I have ever used however are the gear type posi at this link.

They are a little pricey but they are awesome if you want a differential that always works seamlessly and handles power. I think that is the best posi made by far. I even put one in my Super Duty truck.
Yes, very pricey, but good looking unit. Read some really good reviews about the Eaton unit as well

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post #11 of 24 Old 11-19-2017, 09:04 PM
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I recently went spool with 33 spline axles in my car. It's mostly track but I like to cruise it around some. It takes a little getting used to but I like the fact it's one less thing to worry about.
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post #12 of 24 Old 11-21-2017, 04:09 PM Thread Starter
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Tore it down today and found its not even the rear end. Broke output shaft. TKO 3550



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post #13 of 24 Old 11-22-2017, 09:46 AM
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Wow, that will do it.

90 LX Notch 5.0 5spd, bolt on drag car with some giggle gas.
11.71 @ 116mph
86 Gt T-top 5.0 5spd, That one day project.
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post #14 of 24 Old 11-22-2017, 10:07 AM Thread Starter
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Going to try and get it upgraded to a tko 600 input shaft and main shaft. Plus new syncronizers. Cheaper than buying a new tranny

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post #15 of 24 Old 11-22-2017, 02:04 PM
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I would look at that installation very closely. At least in the back end, just looking at the engagement of the slip yoke. Thats a pretty long rust line.
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post #16 of 24 Old 11-22-2017, 11:19 PM
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I would really look at your rear suspension too. I've seen two 3550 transmissions break in the same way yours did. One broke a lower control arm bracket, the other had a defective/broken axle tube. Either way, they both ended up wiping out the transmission. I would have never looked for this, Walt at Promotion helped me find the culprit.

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post #17 of 24 Old 11-23-2017, 01:18 AM Thread Starter
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I would really look at your rear suspension too. I've seen two 3550 transmissions break in the same way yours did. One broke a lower control arm bracket, the other had a defective/broken axle tube. Either way, they both ended up wiping out the transmission. I would have never looked for this, Walt at Promotion helped me find the culprit.
Interesting, but need more detail. I actually talked with Walt today about the upgrade transmission parts.

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post #18 of 24 Old 11-23-2017, 11:00 AM
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Interesting, but need more detail. I actually talked with Walt today about the upgrade transmission parts.

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If I remember correctly, when the axle tube breaks, or spins in the carrier housing, it allows uneven torque distribution and the pinion will get in a bad angle, (imagine the pinion pointing more towards the driver's side front tire instead of the output shaft of the transmission) that's when it will snap a 3550's tail. It's been 4years since I spoke with Walt about this, so hopefully my memory isn't fogged.

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post #19 of 24 Old 11-23-2017, 11:16 AM Thread Starter
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If I remember correctly, when the axle tube breaks, or spins in the carrier housing, it allows uneven torque distribution and the pinion will get in a bad angle, (imagine the pinion pointing more towards the driver's side front tire instead of the output shaft of the transmission) that's when it will snap a 3550's tail. It's been 4years since I spoke with Walt about this, so hopefully my memory isn't fogged.
My axle tubes are welded, but I see where you're going with this


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post #20 of 24 Old 12-03-2017, 10:41 AM
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What's up Steve? What's in your car?

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what's up JB...i run a 31 spline Trac loc..

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post #21 of 24 Old 12-03-2017, 10:45 AM
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My axle tubes are welded, but I see where you're going with this


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need to check your pinion angle.
in all my years I have never broken an output shaft...you may have a driveline alignment issue

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post #22 of 24 Old 12-03-2017, 10:51 AM
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My axle tubes are welded, but I see where you're going with this


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need to check your pinion angle.
in all my years I have never broken an output shaft...you may have a driveline alignment issue

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post #23 of 24 Old 01-06-2018, 01:04 AM Thread Starter
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need to check your pinion angle.

in all my years I have never broken an output shaft...you may have a driveline alignment issue


Will check it again when we go back with everything. It was set correctly when installed though. Canít remember now what it was set on.


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post #24 of 24 Old 01-06-2018, 01:06 AM Thread Starter
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Will check it again when we go back with everything. It was set correctly when installed though. Canít remember now what it was set on. Been on the same tranny now for 6 years. Figured it was time for something to go being itís just a 3550.


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