Brand new FRPP 3.73's have broken teeth! Need advice!!

mixedbreed02gt · Jul 28, 2008

SRT Handz said:
My trac-lock started to go out but i caught the issue before any BS started to occur.

Instead of buying a new T-Lok, i bought a Auburn HD LSD and i have been 100% satisfied on the how the car drives since.

gotta link for that Auburn HD LSD?

bhuff30 · Jul 28, 2008

You are being feed so much BS it's not even funny. First of all, I don't see how a track lok would lock up. It has clutchs and would tend to slip in failure. What's more, if it did lock up, you would notice a squeel from the rear around corners and most likely the first thing to break would be an axle.

Obviously, he didn't do the install correctly or these bolts would not have backed out. I would bet he didn't correctly torque these bolts, which caused them to back out, which let the gears move around and break them. Installer error, I'd suggest having him buy you a new differential.

mixedbreed02gt said:
unfortunately for me, it's not FRPP's faulty gears, and wasn't my mechanics faulty installation. should a put a new differential in from the start.

well my mechanic was pulling the gears and traction-lok out today, and the tracktion-lok was locked up, and caused 3 of the bolts that hold the ring gear to the traction-lok to vibrate loose, which is the reason the teeth on the gears were missing. so I need a new traktion-lok, but I have no idea what to get. might as well beef it up, and make it worth my while.

so I need to know what do I get? (please provide a link if you can).

thanks in advance

mixedbreed02gt · Jul 28, 2008

bhuff30 said:
You are being feed so much BS it's not even funny. First of all, I don't see how a track lok would lock up. It has clutchs and would tend to slip in failure. What's more, if it did lock up, you would notice a squeel from the rear around corners and most likely the first thing to break would be an axle.

Obviously, he didn't do the install correctly or these bolts would not have backed out. I would bet he didn't correctly torque these bolts, which caused them to back out, which let the gears move around and break them. Installer error, I'd suggest having him buy you a new differential.

instead of blaming my mechanic do something constructive like helping me find some parts, so i can get this back together, and get my car back on the road.

he torqued the freakin bolts to spec, I sat there and watched him do it.

dude has 33 years of experience, he knows how to work on a car, he knows how torque stuff down, he knows how to do rear gear installs.

SRT Handz · Jul 28, 2008

mixedbreed02gt said:
gotta link for that Auburn HD LSD?

I got the 28 spline version from jegs. No point in going 31 unless your pushing mad power....if a snap a axel, then whoopdee do because they are cheap.

the diff is $400

Auburn Gear Differentials - JEGS

SRT Handz · Jul 28, 2008

mixedbreed....believe up that a T-lock cant lock up....or you would notice it. Only the clutch packs will slip. If it truely did lock up you would be chirping tires on every corner.

mixedbreed02gt · Jul 28, 2008

SRT Handz said:
mixedbreed....believe up that a T-lock cant lock up....or you would notice it. Only the clutch packs will slip. If it truely did lock up you would be chirping tires on every corner.

so educate me then cause I sat there and watched him torque everything down good and tight he used locktite on them, his install was good, he measured the backlash, shimmed it properly.

something caused those bolts to come out.

mixedbreed02gt · Jul 28, 2008

im taking my camera and I will get some pictures, and post them...it's all i know to do.

SRT Handz · Jul 28, 2008

Honestly, it doesnt matter if you watched him, he f'd up.....so have your mechanic re do everything FO FREE!!!

mixedbreed02gt · Jul 28, 2008

SRT Handz said:
Honestly, it doesnt matter if you watched him, he f'd up.....so have your mechanic re do everything FO FREE!!!

how do you know he f'd up without seeing any of this?

mixedbreed02gt · Jul 28, 2008

would a warped ring gear cause those bolts to come out?

Black_02_GT · Jul 28, 2008

im sure a warped ring gear woulda been popping from the day he installed it or atleast had already caused a noticeable problem...

bhuff30 · Jul 28, 2008

The rear ends from the factory, oddly, don't seem to have a problem with the bolts backing out out. In fact, I have yet to hear of a single incident of this happening on factory installed gears. Funny thing.

It's great that you watched and all, but did you check the torque setting and accuracy of the torque wrench? Did you check that the bolt holes were all clean and dry? Did you check that the correct spec lock tight was used? If you did, I'm surprised you didn't get a fist to the face.

Differential Carriers - summitracing.com

You can shop all kinds of differentials. A Ford racing replacement traction lok is cost effective and reliable way to get you back on the road.

mixedbreed02gt · Jul 28, 2008

bhuff30 said:
The rear ends from the factory, oddly, don't seem to have a problem with the bolts backing out out. In fact, I have yet to hear of a single incident of this happening on factory installed gears. Funny thing.

It's great that you watched and all, but did you check the torque setting and accuracy of the torque wrench? Did you check that the bolt holes were all clean and dry? Did you check that the correct spec lock tight was used? If you did, I'm surprised you didn't get a fist to the face.

Differential Carriers - summitracing.com

You can shop all kinds of differentials. A Ford racing replacement traction lok is cost effective and reliable way to get you back on the road.

no i didn't check the torque ratchet setting. but he did the whole thing with me watching, he used the red locktite which is the strong stuff.

these aren't factory gears either. these were FRPP 3.73's, and they were installed at 82,000 miles, i should have just replaced the damn diff to begin with.

mixedbreed02gt · Jul 28, 2008

well i just ordered a 31 Spline FRPP LSD and a pair of Moser 31 spline forged axles. at least I will have a top notch built rearend now.

shame it had to happen this way.

Black_02_GT · Jul 28, 2008

did you have to order new gears or how is that going to come about getting them replaced?

mixedbreed02gt · Jul 28, 2008

Black_02_GT said:
did you have to order new gears or how is that going to come about getting them replaced?

i ordered the rear gears last week out of my pocket, they arrived Friday afternoon, which was too late to install them friday. so my mechanic got into it today, pulled the ring gear and the carrier, and the carrier casing is all torn to hell, so it has to be replaced. 2 bolts came out, and chipped 2 teeth off of the gears

the pin that goes through the middle of the carrier is all bent, and you can only get it about halfway out. so something happened inside the stock traction-lok when I was driving it to cause those bolts to back out, which in turn got caught between the gear teeth on the ring and the gear teeth on the pinion.

how that happened, we're not 100% sure. some people on multiple forums are saying it's my mechanic's fault and that he didnt torque those bolts properly. if that's the case then I have to ask why didn't all the bolts come out? why only 2 came out? They were all bolted down with a nearly brand new $300 Snap-On Torque Ratchet to spec. I sat there and watched him do it, he coated each bolt with lock-tite (the red colored kind), and bolted the ring gear to the carrier(posi/diff whatever the hell it's called).

on top of the $189 I just spent, I just spent another $500 in new Moser axles, and a new FRPP 31 spline Cobra LSD.

I want answers as much as the next person, but until I have some "definitive proof" as to who is at fault, I refuse to point fingers, and say "well it's your fault, you did it, so you pay for it".

My mechanic was moving some of the spider gears inside the Diff, and there was a lot of play in them, and I recall them being like that when we were putting the gears in the first time, and I remember him mentioning it as well, so maybe I should have just replaced the Diff or had it rebuilt before we did all of this. I don't know if that would cause enough vibration to throw the whole thing off and cause bolts to come out or not.

I went up and took some pictures with my camera...and I will have them up shortly.

mixedbreed02gt · Jul 28, 2008

pics are up of the broken gears and the carrier/diff.

blue02gt/Broken Gears - Photobucket - Video and Image Hosting

maybe one you guys see's something I am missing.

mixedbreed02gt · Jul 28, 2008

sending the FRPP's back and I am going with a Moser 3.73

Just talked with a friend who owns a 91 Mustang GT with a 91.5 mm turbo pumping out 1400 hp, and he said he'd never use anything other than a Moser Ring and Pinion whether it be his street stang, or his drag Mustang and his mechanic who is a Pro Race Mechanic dedicated only to about 3 or 4 cars he works on at any given time echoed the sentiment on the rear gears and after seeing their car run numerous times I can't argue with experience.

blackfang · Jul 29, 2008

mixedbreed02gt said:
would a warped ring gear cause those bolts to come out?

You wouldn't be able to get a good wear pattern to test backlash and all that with a warped ring gear.

mazen189 · Jul 29, 2008

I think your gears were just bad luck, I wouldn't really leave genuine ford parts behind after one incident....i mean, you are representing ford by driving their car

i really just think it was luck of draw...or mechanic messed up...either way, it was bad luck. like my ticket i got yesterday

Brand new FRPP 3.73's have broken teeth! Need advice!!

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