Need Help... What The Best Differential Carrier?

Crazytrucker74

New Member

Nov 23, 2015

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Nov 23, 2015

#1

• Nov 23, 2015

• #1

I have an 87 lx with a 5.0 that I'm planning on drag racing in street class. Getting ready to replace the stock ring and pinion with a 4.10 and 31 spline axles. Lmr.com has the full kit that comes with a Ford Racing differential, I'm just not sure that'll cut it.
1) I want to get as close to posi as I can but still want to drive it around town.
2) how long do the clutch packs last?

 

madspeed

Colonel Mustard

Founding Member

Nov 29, 1999

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Nov 24, 2015

#2

• Nov 24, 2015

• #2

Thread moved to fox section...

 

A5literMan

At least it is lumpy...

5 Year Member

Jul 30, 2011

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Nov 24, 2015

#3

• Nov 24, 2015

• #3

I'm using the ford girdle,31 spline diff and 3.73 ring and pinion. I've had no issues. This is 2nd one I've had on 2 separate cars. 1st one ran 12.00's on 5000rpm launches without a problem(except when I snapped an axle once).

 

Reactions: mikestang63

addermk2

5 Year Member

Aug 25, 2009

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Nov 25, 2015

#4

• Nov 25, 2015

• #4

I run a Ford Racing Cobra diff, with carbon clutches. I rebuild it every few years... and not because it's worn out.

 

RangerJoe

I leave the horn on while driving

15 Year Member

Apr 26, 2010

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Nov 25, 2015

#5

• Nov 25, 2015

• #5

I think LMR uses the carbon diff in that kit. Honestly, unless you are at the track every weekend, or making gobs of power, the clutch packed diff will work just fine. I pulled an used 31 spline diff out of an explorer, for free, and bought the $110 carbon fiber rebuild kit. I have been rocking that thing for almost 4 years and probably have 60+ passes at the strip on it.

Joe

 

Crazytrucker74

New Member

Nov 23, 2015

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Nov 26, 2015

#6

• Nov 26, 2015

• #6

Or all who replied, thanks. It has all been good news. Just started building up my LX, and looking forward to racing it this coming season. Again thanks everyone.

 

Chuckman

GTFO you fat, heavy bastard

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Oct 21, 2005

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st. louis, mo

Nov 27, 2015

#7

• Nov 27, 2015

• #7

31-spline frpp trak-loc with carbon discs here as well. the diffs can handle quite a bit of power, and the discs will last a good long while. just be aware after a certain point you'll have to use a non-c-clip axle to stay nhra legal (either eliminators or 9-inch ends)