New Differential..Please Help

LABARINTH · 03-19-2002, 10:25 PM

Hi guys, I am swapping to a 4.6L V8 Cobra engine and a T-45 tranny. I was wondering what I should do with the rear end. Should I change the gears to 3.73, 4.10, or to 4.30? I was thinking about going with the 3.73's because everyone I talked to said they were the best. But recently I read that the 4.10's or even the 4.30's offer the best acceleration and are fine for a daily driver. The article I read said that you could drive at 80mph down the road with the 4.10's and be only at 2800rpms, which doesn't seem that bad. I'm really new to this and I want a car that accelerates hard, but I also want a daily driver. What gears should I go with?
Also, should I just change the gears or should I change the entire differential? I was thinking of Auburn Locking Differentials from steeda, but I don't know anything about it.
Please help, I have no clue what to get. I want a car that can be a daily driver, but that will also accelerate hard (I don't mind a little whiplash

).

SLOW 97 · 03-20-2002, 09:48 AM

Go with the 4.30's and an Eaton Posi. This will offer good traction and it is a lot more durable than the factory Ford Traction-Lok differential. The Saleen Max-Grip differential is pretty trick I hear too but is quite expensive. I think it is a little over $1000. Not sure how much but go here for info about it http://www.saleen.com/store2000/set1.asp.

LABARINTH · 03-20-2002, 03:09 PM

Thanks, I'll probably go with the an Eaton Posi, however, I can't find one that is 28 spline. That is what I need right? Where can I find one? I checked steeda, and all they have is the 31 spline one.

Mustang92 · 03-21-2002, 11:10 AM

If your only swapping out the differential then I would say wait till you have the cash to change axles as well. There isn't much of a market for 28 spline differentials. When someone goes to a better diff it's usually to upgrade axles as well.

Bill

SLOW 97 · 03-21-2002, 11:29 AM

Yeah get the 31-spline Eaton with 31-spline Moser axles. 31-splines are much better and stronger than the 28-spline axles. The 28's are what come stock.

LABARINTH · 03-21-2002, 10:32 PM

I have the cash so maybe I'll do the axles also... Is there anything else I need to know if I am going to change the axles?...Anything tha might not work and also have to be changed at the same time?...everything on the tranny with work ok?

SLOW 97 · 03-25-2002, 03:55 PM

Everything will work.

03-19-2002, 10:25 PM	#1
LABARINTH Registered Member Join Date: Jan 2002 Location: Manlius, NY Posts: 17	New Differential..Please Help Hi guys, I am swapping to a 4.6L V8 Cobra engine and a T-45 tranny. I was wondering what I should do with the rear end. Should I change the gears to 3.73, 4.10, or to 4.30? I was thinking about going with the 3.73's because everyone I talked to said they were the best. But recently I read that the 4.10's or even the 4.30's offer the best acceleration and are fine for a daily driver. The article I read said that you could drive at 80mph down the road with the 4.10's and be only at 2800rpms, which doesn't seem that bad. I'm really new to this and I want a car that accelerates hard, but I also want a daily driver. What gears should I go with? Also, should I just change the gears or should I change the entire differential? I was thinking of Auburn Locking Differentials from steeda, but I don't know anything about it. Please help, I have no clue what to get. I want a car that can be a daily driver, but that will also accelerate hard (I don't mind a little whiplash ). __________________ 2000 Ford Mustang 3.8L V6 Engine -205hp -Sports Package -Duel Exhaust -LowGlow Blue Fog Lights -PIAA Crystal Hyperwhite Headlight Bulbs -2 JLAudio 12in. Subwoofers in Custom Enclosure -1 Alpine V12 600W Amp -1 Alpine V12 240W Amp -Alpine CDA-7965 AM/FM/CD Player - Front and Rear JLAudio 5x7 woofers and tweeters -Razzi ground effects kit -Custom MachIII Wing -Custom Chrome Exhaust tips http://www.cardomain.com/id/_labarinth_

03-20-2002, 09:48 AM	#2
SLOW 97 Registered Member Join Date: Feb 2002 Location: Arlington Heights,IL Posts: 231	Go with the 4.30's and an Eaton Posi. This will offer good traction and it is a lot more durable than the factory Ford Traction-Lok differential. The Saleen Max-Grip differential is pretty trick I hear too but is quite expensive. I think it is a little over $1000. Not sure how much but go here for info about it http://www.saleen.com/store2000/set1.asp. __________________ '97 Laser Red GT Coupe Stock 2V (Pulled Silencer) 4R70W Automatic Ripped off a BLISTERING 15.37@90MPH With a 2.21 60ft Just Installed- K&N Air Filter Coming Soon...... -4.10's -Flowmaster A/T or Magnapack Cat-Back

03-20-2002, 03:09 PM	#3
LABARINTH Registered Member Join Date: Jan 2002 Location: Manlius, NY Posts: 17	Thanks Thanks, I'll probably go with the an Eaton Posi, however, I can't find one that is 28 spline. That is what I need right? Where can I find one? I checked steeda, and all they have is the 31 spline one. __________________ 2000 Ford Mustang 3.8L V6 Engine -205hp -Sports Package -Duel Exhaust -LowGlow Blue Fog Lights -PIAA Crystal Hyperwhite Headlight Bulbs -2 JLAudio 12in. Subwoofers in Custom Enclosure -1 Alpine V12 600W Amp -1 Alpine V12 240W Amp -Alpine CDA-7965 AM/FM/CD Player - Front and Rear JLAudio 5x7 woofers and tweeters -Razzi ground effects kit -Custom MachIII Wing -Custom Chrome Exhaust tips http://www.cardomain.com/id/_labarinth_

03-21-2002, 11:10 AM	#4
Mustang92 Drag Racer! Join Date: Nov 1999 Location: Lake Worth, FL USA Posts: 757	If your only swapping out the differential then I would say wait till you have the cash to change axles as well. There isn't much of a market for 28 spline differentials. When someone goes to a better diff it's usually to upgrade axles as well. Bill __________________ 2000 GT VRS O/R X, Dynomax Bullets, Steeda Pulleys, Pro-M 80MM, 4.30s, UPR Pro Series Suspension, UPR Tubular K-member, MAC Longtubes, Bullitt Intake, TKO, VT Engine Stage 1 NA Cams, SCT Tune. 285 RWHP/296 RWTQ 11.97 @ 113.20 M/M 100, 7085 www.uprproducts.com www.ponyexpressperformance.com www.modulardepot.com

03-21-2002, 11:29 AM	#5
SLOW 97 Registered Member Join Date: Feb 2002 Location: Arlington Heights,IL Posts: 231	Yeah get the 31-spline Eaton with 31-spline Moser axles. 31-splines are much better and stronger than the 28-spline axles. The 28's are what come stock. __________________ '97 Laser Red GT Coupe Stock 2V (Pulled Silencer) 4R70W Automatic Ripped off a BLISTERING 15.37@90MPH With a 2.21 60ft Just Installed- K&N Air Filter Coming Soon...... -4.10's -Flowmaster A/T or Magnapack Cat-Back

03-21-2002, 10:32 PM	#6
LABARINTH Registered Member Join Date: Jan 2002 Location: Manlius, NY Posts: 17	I have the cash so maybe I'll do the axles also... Is there anything else I need to know if I am going to change the axles?...Anything tha might not work and also have to be changed at the same time?...everything on the tranny with work ok? __________________ 2000 Ford Mustang 3.8L V6 Engine -205hp -Sports Package -Duel Exhaust -LowGlow Blue Fog Lights -PIAA Crystal Hyperwhite Headlight Bulbs -2 JLAudio 12in. Subwoofers in Custom Enclosure -1 Alpine V12 600W Amp -1 Alpine V12 240W Amp -Alpine CDA-7965 AM/FM/CD Player - Front and Rear JLAudio 5x7 woofers and tweeters -Razzi ground effects kit -Custom MachIII Wing -Custom Chrome Exhaust tips http://www.cardomain.com/id/_labarinth_

03-25-2002, 03:55 PM	#7
SLOW 97 Registered Member Join Date: Feb 2002 Location: Arlington Heights,IL Posts: 231	Everything will work. __________________ '97 Laser Red GT Coupe Stock 2V (Pulled Silencer) 4R70W Automatic Ripped off a BLISTERING 15.37@90MPH With a 2.21 60ft Just Installed- K&N Air Filter Coming Soon...... -4.10's -Flowmaster A/T or Magnapack Cat-Back

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