Beef up the rear...need advice.

Mikie

the ahead of you horseman

Aug 2, 2000

517

1

0

Belmont NC

Nov 10, 2008

#1

• Nov 10, 2008

• #1

Ok guys,
Please tell me what I need to safetly run slicks on the car. Reccomend me a set of axles (part number if you know it)
I have FRPP 3.73 gears , but factory differential. what else needs to be upgraded to hold 3,000-4,000 rpm launches.
The Factory clutch may **** out on the track, but right now Im concentrating on the rear.

Thanks for any info.

 

02nightmaregt

To hell with your Mustang, I want to see your HOG!

Jul 1, 2007

513

4

19

Southern Indiana

Nov 10, 2008

#2

• Nov 10, 2008

• #2

Are you wanting a straight up drag setup or DD setup?

 

Mikie

the ahead of you horseman

Aug 2, 2000

517

1

0

Belmont NC

Nov 10, 2008

#3

• Nov 10, 2008

• #3

Definitely a daily driver with ...say 10 serious track events per year.
Gotta drive it to and from the track back to the house.

Also these are full hoosier slicks, not drag radials or dot slicks.

Thanks

 

AdRock

Member

Nov 13, 2003

521

1

19

South Texas

Nov 11, 2008

#4

• Nov 11, 2008

• #4

Get a set of 31 spline axles, Moser, Superior. 3 inch studs, and since it's a DD you would most likely be fine with an OEM F150 31 spline diff. Before putting it in have a shop do the mods needed to fit the extra clutches in the diff. Might as well replace all the bearings & seals while you're in there too.

 

the98stang

Active Member

Aug 12, 2005

2,408

0

47

Clovis, CA

Nov 11, 2008

#5

• Nov 11, 2008

• #5

AdRock said:

Get a set of 31 spline axles, Moser, Superior. 3 inch studs, and since it's a DD you would most likely be fine with an OEM F150 31 spline diff. Before putting it in have a shop do the mods needed to fit the extra clutches in the diff. Might as well replace all the bearings & seals while you're in there too.

Click to expand...

+1

31 axles, FRPP 31 spline diff would be perfectly fine.

 

bhuff30

Founding Member

Dec 11, 2001

6,037

35

129

Olathe KS

Nov 11, 2008

#6

• Nov 11, 2008

• #6

Ironically, slicks are often nicer to driveline parts than drag radials. Drag radials don't have such soft or tall sidewalls as slicks. The distortion of the sidewall absorbs a lot of the shock load which drag radials would otherwise give to your driveline.

The 31 spline upgrade would be nice for reliability, but not mandatory either. Just depends on your launch style, tire choice and transmission type. Heck, my 2.3 is still running a 7.5" open rear end with a 1.797 60' time. It survived this long because the automatic is much nicer and doesn't shock load the driveline the way a clutch drop would.

 

pony_grrl

New Member

Oct 6, 2008

0

0

0

Nov 11, 2008

#7

• Nov 11, 2008

• #7

I have Moser 31 splines (# A883153) with a Detroit TruTrac diff (# 913A561) and a T/A girdle ( # TA-1806).

It's a daily, my only car, and I have 0 problems. I've run drag radials for 2 years now and no issues also.

 

T

TonyG

Founding Member

Apr 12, 2002

200

0

17

Owings Mills, MD

Nov 11, 2008

#8

• Nov 11, 2008

• #8

I had my stock 28 spline axles/trackloc for over 200 passes with 28" slicks and 5000-6000 rpm launches, and it held up.

For peace of mind, I just switched over to a 31 spline carrier from Randy S ($169) and Moser axles from Jegs ($250).

 

Mikie

the ahead of you horseman

Aug 2, 2000

517

1

0

Belmont NC

Nov 11, 2008

#9

• Nov 11, 2008

• #9

Thanks guys..and grrls
Definitely food for thought.

 

02nightmaregt

To hell with your Mustang, I want to see your HOG!

Jul 1, 2007

513

4

19

Southern Indiana

Nov 11, 2008

#10

• Nov 11, 2008

• #10

I just got done doing the 31 spline upgrade last week. I got the FRPP 31 spline T-lok, Moser axles, and FRPP3.73's. I'm sure this will be strong enough for a DD that doesn't do TOO much dragging. And like bhuff said about the slicks, they won't be jarring the hell out of you either.

 

SaleenGT2001

Well-Known Member

Jul 18, 2005

2,811

4

58

Four Oaks NC

Nov 11, 2008

#11

• Nov 11, 2008

• #11

31 spline axles, auburn pro diff, and c clip elims would do the trick.

thats my set up and it has seen numerous 5000 rpm clutch drops

 

Mikie

the ahead of you horseman

Aug 2, 2000

517

1

0

Belmont NC

Nov 11, 2008

#12

• Nov 11, 2008

• #12

 

B

blubullett

Member

Jun 22, 2006

535

6

18

Modesto, CA

Nov 11, 2008

#13

• Nov 11, 2008

• #13

buyfordracing.com should have both the axles and 31 spline trac loc for good prices.

 

frey_gt

New Member

Nov 15, 2005

17

0

0

Williamsburg,Oh

Nov 12, 2008

#14

• Nov 12, 2008

• #14

31 spline Moser axels, 31 spline diff with restacked clutches and no problems yet.

 

slayr281

The poster formerly known as slayr420

Founding Member

Jun 15, 1999

7,591

18

98

San Diego, California

Nov 12, 2008

#15

• Nov 12, 2008

• #15

buyfordracing doesn't seem to have them up in their store, only the rebuild kit. Buy Ford Racing Parts!

However, we stock Ford Racing and Moser 31 splines for some great prices.

 

Mustang92

SN's #1 1%er

Jun 6, 2001

6,467

2

79

South Florida

Nov 12, 2008

#16

• Nov 12, 2008

• #16

At your power level I'd say 31 spline axles, 3" studs, 03/04 Cobra 31 spline diff or TruTrac, weld axle housing (center section to axle tubes) and weld the torque boxes. Then you should be fine. Not 100% bullet proof (you would need to go spool for that) but that will keep the rear together and prevent you from spinning an axle tube or ripping the rear suspension out. I'd steer clear of anything made by Auburn in a drag racing situation.

Bill

 

Mikie

the ahead of you horseman

Aug 2, 2000

517

1

0

Belmont NC

Nov 12, 2008

#17

• Nov 12, 2008

• #17

Thanks Bill.

I am invited to go with the SC Cobra club to a track rental on Nov 22 and probably wont have time or cash to get the rear done. I am going to plan on a Tax check to take care of it.
Here is my worry....
I am going to put the full Hoosier slicks on a set of Weld wheels and try to get away with running the factory rear.
Now keep in mind that Im not going to be dumping the clutch at any rpm. I plan on heating up the stickies, pulling up to the line and leaving like I normally do on street tires...just easing it out.
I think I will be ok doing this. What do you think?

I will have my buddy there with his trailer so if something would break, I got a ride home...lol

 

Shiroelex

There's nothing worse than aut

Founding Member

Aug 23, 2001

728

1

27

Westland, MI

Nov 12, 2008

#18

• Nov 12, 2008

• #18

pony_grrl said:

I have Moser 31 splines (# A883153) with a Detroit TruTrac diff (# 913A561) and a T/A girdle ( # TA-1806).

It's a daily, my only car, and I have 0 problems. I've run drag radials for 2 years now and no issues also.

Click to expand...

I run essentially the same setup, except I have a Tru-Trac Detroit Locker. I've done numerous 5k clutch dumps on 315/35/17 BFG DR's, and have never heard peep from the rear.

 

stangJunkie04

New Member

Jul 11, 2005

44

1

0

Vernon, CT

Nov 13, 2008

#19

• Nov 13, 2008

• #19

I have a eaton rear dif with strange 31 spline axles and frpp girdle it has held up pretty well at the strip. I run MT et streets and launch pretty hard and it has held up so far. (KNOCK ON WOOD)