Do I need a built rear end? - 2003-04 Mach 1 Registry Owners Club

ScreeminMach · 02-18-2017, 06:36 PM

I just got some Mickey Thompson ET Street SS tires, 275 40 17's for some nine inch wheels,
because with the new torque converter, I just spin the 315 Nitto 555 tires, like crazy. When I put the new tires on am I going to be stressing my axles to the point of breaking them? All of the mods I have done are for in my sig. I'm not even making 300 horsepower so I don't think I will have to. What do you think?

32VALVR · 02-19-2017, 12:16 AM

You don't mention axles or diff in your sig. I would definitely go Ford Trak Loc with 31 spline carbon fiber clutches and 31 spline axles. best bet is Strange, I had to shim my calipers for my Mosers.

ScreeminMach · 02-19-2017, 01:31 AM

My rear end is stock with the exception of the gears. I can see how you would benefit from upgrading the axles and the diff because of your supercharger, but I am all stock. Do you guys think it's necessary to upgrade the diff and axles with no power adder? I'm not trying to be a cheapskate or anything but if this isn't necessary, I would rather put my money elsewhere.

32VALVR · 02-19-2017, 01:40 AM

It's not how much poewer I make, you make enough that if you dead hook, or wheel hop, theres a good chance that you'll break a 28 spline axle and have to have your whole 3td cleaned, not to mention the tow.. Your call.

gfong · 02-19-2017, 08:23 AM

Are you taking it to the strip or just street? What rpm do you launch at if you are on the strip? Autos launch a lot softer than manuals do and don't abuse the axles as much.
I'm not saying autos don't need them but if your just pounding it on the street you should be okay.

If it sees the strip anytime I would upgrade. Peace of mind means a lot when you are at the line and wanna see if the car can take another couple thousand rpm launch cause the track is sticking and you just wanna go faster.

Good luck with your build.

jbrad88 · 02-19-2017, 09:52 AM

Old school approach here, and i know some will disagree with me...

If you are going to try and make the car hook...build it and don't look back. Good posi, good axles, and be done..31spline of course.

I built mine years ago...I had my 4.10's sitting around from my old fox, so i did not have the added cost of a gearset, just posi, axles and install.

as always JMHO...

2k4mach · 02-19-2017, 08:49 PM

with an auto, you could prolly be ok with stock, you could go the cheap route and just toss some 28 spline mosers in it. my thought is if your gonna tear into might as well build for the future. so 31 spline along with the diff of your choice.

ScreeminMach · 02-20-2017, 09:30 AM

Yes I agree. I think that's what I'm going to do. Everyone seems to agree on the 31 spline Moser axles but what about the diff? I was thinking about going with a Ford Racing traction Lok. Is that what you guys would go with too?

rich1 · 02-21-2017, 03:09 PM

Quote:

Originally Posted by 32VALVR

It's not how much poewer I make, you make enough that if you dead hook, or wheel hop, theres a good chance that you'll break a 28 spline axle and have to have your whole 3td cleaned, not to mention the tow.. Your call.

This above statement is very true.

02-18-2017, 06:36 PM	#1
ScreeminMach Registered User Join Date: Jul 2005 Location: Naples, Fl. Posts: 400	Do I need a built rear end? I just got some Mickey Thompson ET Street SS tires, 275 40 17's for some nine inch wheels, because with the new torque converter, I just spin the 315 Nitto 555 tires, like crazy. When I put the new tires on am I going to be stressing my axles to the point of breaking them? All of the mods I have done are for in my sig. I'm not even making 300 horsepower so I don't think I will have to. What do you think? __________________ 04' Screemin Yellow Auto/IUP 284 HP 300 TQ MODS Circle D TC 3500 stall, AFS staggered wheels with black inserts, Steeda bump steer and X2 ball joints, 4.10's, Aeroforce scan guage, MM HD LCA's, MGW shifter, AOD relocated to console, PHP Spacer, Ford Racing aluminum DS, SCT Tune (Xcal 2), Street Smart Design CAI, K&N drop in, Eibach Sportline springs, Steeda c/c plates, Magnaflow catted x-pipe, Magnaflow cat back, Magnaflow 3 1/2" rolled tips

02-19-2017, 12:16 AM	#2
32VALVR Registered Mach Abuser Join Date: Apr 2006 Location: SoCal Posts: 1,695	Re: Do I need a built rear end? You don't mention axles or diff in your sig. I would definitely go Ford Trak Loc with 31 spline carbon fiber clutches and 31 spline axles. best bet is Strange, I had to shim my calipers for my Mosers. __________________ 04 O/W 5sp with Kenne Bell 2.1 intercooled kit@ 10lbs.

02-19-2017, 01:31 AM	#3
ScreeminMach Registered User Join Date: Jul 2005 Location: Naples, Fl. Posts: 400	Re: Do I need a built rear end? My rear end is stock with the exception of the gears. I can see how you would benefit from upgrading the axles and the diff because of your supercharger, but I am all stock. Do you guys think it's necessary to upgrade the diff and axles with no power adder? I'm not trying to be a cheapskate or anything but if this isn't necessary, I would rather put my money elsewhere. __________________ 04' Screemin Yellow Auto/IUP 284 HP 300 TQ MODS Circle D TC 3500 stall, AFS staggered wheels with black inserts, Steeda bump steer and X2 ball joints, 4.10's, Aeroforce scan guage, MM HD LCA's, MGW shifter, AOD relocated to console, PHP Spacer, Ford Racing aluminum DS, SCT Tune (Xcal 2), Street Smart Design CAI, K&N drop in, Eibach Sportline springs, Steeda c/c plates, Magnaflow catted x-pipe, Magnaflow cat back, Magnaflow 3 1/2" rolled tips

02-19-2017, 01:40 AM	#4
32VALVR Registered Mach Abuser Join Date: Apr 2006 Location: SoCal Posts: 1,695	Re: Do I need a built rear end? It's not how much poewer I make, you make enough that if you dead hook, or wheel hop, theres a good chance that you'll break a 28 spline axle and have to have your whole 3td cleaned, not to mention the tow.. Your call. __________________ 04 O/W 5sp with Kenne Bell 2.1 intercooled kit@ 10lbs.

02-19-2017, 08:23 AM	#5
gfong Greg Fonger Join Date: May 2004 Location: Ontario, Canada Posts: 3,416	Re: Do I need a built rear end? Are you taking it to the strip or just street? What rpm do you launch at if you are on the strip? Autos launch a lot softer than manuals do and don't abuse the axles as much. I'm not saying autos don't need them but if your just pounding it on the street you should be okay. If it sees the strip anytime I would upgrade. Peace of mind means a lot when you are at the line and wanna see if the car can take another couple thousand rpm launch cause the track is sticking and you just wanna go faster. Good luck with your build.

02-19-2017, 09:52 AM	#6
jbrad88 Original Owner Join Date: Apr 2003 Location: Houston, Texas Posts: 5,172	Re: Do I need a built rear end? Old school approach here, and i know some will disagree with me... If you are going to try and make the car hook...build it and don't look back. Good posi, good axles, and be done..31spline of course. I built mine years ago...I had my 4.10's sitting around from my old fox, so i did not have the added cost of a gearset, just posi, axles and install. as always JMHO... __________________ JB 03 Torch Red Mach 1 21 FJG Mach 1 Stainless Steel Systems Adrenaline Series BBK long tube headers catted x pipe 18x9 18x10- Solid Gloss Black FR5's Nitto 555 g2 275/35r18's 285/35r18 MGW Shifter With Mach1 Shift Knob 4.10's & 31 spline Mosers and 31 Spline Posi Steeda Sport Springs Tokiko Illuminas J@M weight Jacker LCA's J@M Rear UCA's J@M Braided steel brake lines Eibach Sway Bars

02-19-2017, 08:49 PM	#7
2k4mach LuLz Join Date: Dec 2003 Location: Cedar Park, TX Posts: 19,294	Re: Do I need a built rear end? with an auto, you could prolly be ok with stock, you could go the cheap route and just toss some 28 spline mosers in it. my thought is if your gonna tear into might as well build for the future. so 31 spline along with the diff of your choice. __________________ 11 Sterling gray GT500 coupe 08 Silver Z06 1058rwhp/1073rwt @ 15psi 14 Silver Q50S Vortech blown 04 DSG Mach 1 (stolen) 03 OW Mach 1 (sitting in a field rotting away)

02-20-2017, 09:30 AM	#8
ScreeminMach Registered User Join Date: Jul 2005 Location: Naples, Fl. Posts: 400	Re: Do I need a built rear end? Yes I agree. I think that's what I'm going to do. Everyone seems to agree on the 31 spline Moser axles but what about the diff? I was thinking about going with a Ford Racing traction Lok. Is that what you guys would go with too? __________________ 04' Screemin Yellow Auto/IUP 284 HP 300 TQ MODS Circle D TC 3500 stall, AFS staggered wheels with black inserts, Steeda bump steer and X2 ball joints, 4.10's, Aeroforce scan guage, MM HD LCA's, MGW shifter, AOD relocated to console, PHP Spacer, Ford Racing aluminum DS, SCT Tune (Xcal 2), Street Smart Design CAI, K&N drop in, Eibach Sportline springs, Steeda c/c plates, Magnaflow catted x-pipe, Magnaflow cat back, Magnaflow 3 1/2" rolled tips

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