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Premium 9 Inch Ford Mini Spool, 31 Spline

Specs
Material Type:
Steel
Sold in Quantity:
Each
Spline Count:
31
Garage Sale:
No
Notes
8620 Steel
Premium 9 Inch Ford Mini Spool, 31 Spline

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

Our forged 8620 steel mini spools are designed to replace the spider gears inside the stock differential carrier. This premium mini spool features a larger diameter for maximum strength. It works great for most dirt applications and some asphalt.

  • For Ford 8 or 9" rear axles.
  • Will NOT work on posi carrier.
  • Use with 3/4" chromoly cross pin (listed) # 655-7520.

Customer Reviews

Rated 4.8 out of 5 by 4 reviewers.
RATING BREAKDOWN
4 reviews
5 Stars
3
4 Stars
1
3 Stars
0
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

JEFF
Verified Purchaser
Verified Reviewer
OMAHA

easy install

July 22, 2015
fit great
Yes, I recommend this product.
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Bigboy
Verified Purchaser
Las cruces NM

I would buy again

May 20, 2011
Works good on x mod
Yes, I recommend this product.
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The Hienna
Verified Purchaser
Somerset, Ky

New Mini Spool

March 22, 2011
This mini spool is worth it. The upgrade is stronger than welding the spider gears. I have ran with welded gears, this is a lot better set up. The cons are that you have to remove the spider gears, this is time consuming but well worth it.
Pros:
  • Better than welding
Yes, I recommend this product.
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Demo Man
Stockton, KS

Great for locking up rear ends

August 28, 2010
Works great for locking up rear ends in demo cars.
Pros:
  • Easy
  • cheap
Yes, I recommend this product.
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Page 1 of 1

Product Q&A

1 questions : 1 answers

1 answers

I have a asphalt stock car with 10" slicks and 375hp weighing about 3200lbs..would you say I could use this in my car?

rrocketryan
July 24, 2013

I have a asphalt stock car with 10" slicks and 375hp weighing about 3200lbs..would you say I could use this in my car?

Answers

July 25, 2013
EricM
For ultimate strength you would be much better off with a full spool. You may want to ask around to some of the other racers with that type of car and see if they have many failures with mini spools. For most asphalt cars with 10" slicks I would recommend against a mini spool, however with the horsepower you are at it might be ok.
Page 1 of 1

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Our 3/4" cross pin for the 8" & 9" Ford axle is machined from chromoly steel and will stand up to lots of racing abuse.

Ford 9 Inch Steel Full Spool
(Part #8025034)
                        

Lightweight and standard steel Ford 9" full spools are available with 28 or 31 splines. Standard steel spool weighs 8.7 lbs. (28 Spline) & 8.0 lbs. (31 Spline).  The lightweight steel spool weighs 6.2 lbs. (28 Spline) & 6.1 lbs. (31 Spline)

NOTE: All Ford 9" full spools use overhaul kit #919-0950-31, even if they are a 28 spline spool.  The 919-0950-31 contains the large I.D. standard O.D. carrier bearings and pinion bearings.

If you are using the H.D. nodular iron center section which use the large diameter carrier bearings, order kit # 919-0950-31s, which also includes the large pinion bearings for use with the Daytona pinion support.
Ford 9 Inch Megalite Steel Full Spool, 31-Spline
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                        These Ford 9" megalite steel full spools weigh just 5.49 lbs.

Comparison spool weights:

  • Aluminum - 5.0 lbs.
  • Lite Steel - 6.1 lbs.
  • Standard Steel - 8.0 lbs.
  • Stock carrier with mini spool - 13.7 lbs.

Note: All Ford 9" full spools use overhaul kit 9190950-31. The 9190950-31 contains the large I.D. standard O.D. carrier bearings and pinion bearings needed for use with our full spools.

If you are using the H.D. nodular iron center section which uses the large diameter carrier bearings, order kit 9190950-31s, which also includes the large pinion bearings for use with the Daytona pinion support.

Economy 9 Inch Ford Mini Spool, 31 Spline
(Part #6553101)
                        

Our forged, heat-treated steel mini spools are designed to replace the spider gears inside the stock differential carrier. This economy spool works best for dirt applications with claimer motors and narrow tires. For Ford 8 or 9" rear axles.

Will NOT work on posi carrier. Use with 3/4" chromoly cross pin (listed).

Motive Gear Ford 9 Inch Performance Ring and Pinion, 1957 - Up Style
(Part #919194)
                        

Motive Gear 9" Performance Style 1957 & Up ring and pinion gear sets are quality assured and tested to take a beating in your aluminum or steel housing.  Computer-controlled heat treatment, index tooth spacing, and CNC machining all go into this series of performance gear sets. 

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  • Ring gear diameter 9"
  • 10-7/16" x 20 RH threaded bolts
  • Pinion diameter 1.313" 28 splines
  • No case breaks
  • 8620 Material - Heat Treated
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Note:  Circle track racing applications require a minimum of 4 qts. of rear end lube.  Using less than this amount will lead to immediate pinion bearing failure.

Motive Gear Performance Ring and Pinion Chart (GIF)   

Lubrication Engineers SAE 140 Weight Gear Oil, 1 Gallon
(Part #91044140)
                        

Whether you're running a stock flattie and rearend or hopped-up overhead and quick change, you need to run a good gear lube. Remember that your rearend was designed fifty plus years ago and needs all the help it can get. The biggest improvement you can give it is a lubricant that will allow the gears to survive the highway speeds that cars see today. L.E. gear oil is what we use in our 350 mph streamliner, that uses a V-8 quick change, without failure. The "red stuff" provides superior lubrication for long gear life. You can't win if you don't finish. We suggest 90 weight for the street and 140 weight for extreme uses.

  • Formulated using blends of high quality paraffinic and synthetic base fluids
  • Contains a highly shear stable tackiness
  • Unique blend of base fluids and thermally stable EP additives
  • Separates readily from water
  • Contains non-silicone defoaming additives
  • Contains no solids
  • Contains DUOLEC LE's proprietary dual acting liquid wear-reducing and extreme pressure additive

LE Gear Oil Data Sheet (PDF)

Lubrication Engineers SAE 90 Weight Gear Oil, 1 Gallon
(Part #91044090)
                        Whether you're running a stock flattie and rearend or hopped-up overhead and quick change, you need to run a good gear lube. Remember that your rearend was designed fifty plus years ago and needs all the help it can get. 

The biggest improvement you can give it is a lubricant that will allow the gears to survive the highway speeds that cars see today. L.E. gear oil is what we use in our 350 mph streamliner, that uses a V-8 quick change, without failure. The "red stuff" provides superior lubrication for long gear life. You can't win if you don't finish. We suggest 90 weight for the street and 140 weight for extreme uses.

  • Formulated using blends of high quality paraffinic and synthetic base fluids
  • Contains a highly shear stable tackiness
  • Unique blend of base fluids and thermally stable EP additives
  • Separates readily from water
  • Contains non-silicone defoaming additives
  • Contains no solids
  • Contains DUOLEC LE's proprietary dual acting liquid wear-reducing and extreme pressure additive
LE Gear Oil Performance Data Sheet (PDF)

LE Gear Oil Safety Data Sheet  (PDF)