Product Summary

74-78 Mustang II, 74-80 Pinto, 75-80 Bobcat, Natural

  • Forged and heat-treated Mustang II spindles provide superior strength over weaker cast versions
  • Retains stock suspension geometry with spindle pin in factory location for original ride height
  • Fully machined for stock bearings, seals, ball joint tapers, and disc brake caliper mounting
  • Direct replacement for Mustang II, Pinto, and aftermarket Mustang II suspension kits
  • Compatible with a wide range of disc brake kits for easy upgrade options
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Key Specs

PositionLeft and Right
Spindle StyleFord Stock
Spindle DropStock Height
Brake System TypeDisc
Material TypeForged Steel
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Need To Know

Quick and Easy Returns

Return Policy

Speedway Motors 91034307 Details

  • Crafted from forged and heat-treated steel for ultimate strength
  • Spindle pin positioned in stock location to maintain original ride height
  • Retains stock suspension geometry and disc brake mounting points
  • Direct replacement for stock Mustang II/Pinto and Mustang II front suspension kits
  • Large number of disc brake kits available in Ford and GM wheel bolt patterns
  • Uses stock Mustang II inner and outer wheel bearings, seals, and hardware
  • Sold as a pair of spindles (one left and one right)

Upgrade Your Mustang II IFS System’s Spindles with Stronger Forged Versions

The Mustang II front suspension design, found under the 1974-1978 Mustang II and 1974-1980 Pinto/Bobcat, has a long history in the hot rod and muscle car world as the IFS conversion to use. These early adopters used factory front crossmembers and suspension components cut from wrecked Mustangs at the beginning. This meant stamped steel control arms, cast steel spindles, and rather small 9-inch disc brakes. Later, the aftermarket would introduce chassis specific crossmembers that were easier to graft into various applications, though they still used OEM suspension components for the most part. It wouldn’t be until the aftermarket caught up to the demand with full Mustang II IFS conversions using strong tubular Mustang II control arms, forged steel spindles, and larger 11- to 13-inch disc brake kits.

Today, if you’re still running an older Mustang II front end you can easily upgrade your IFS’s strength and ability with said tubular control arms, forged spindles, and larger disc brakes without having to replace your older crossmember. Forget hunting down original Mustang II spindles, or using lesser quality cast replacement spindles, and go straight to the premium strength of a forged spindle. Forged Mustang II spindles are hot forged under pressure to their final shape; heat treated and then surfaces machined. This forging process maintains the metal’s grain structure for increased strength. Cast Mustang II spindles are made from a mold that molten steel is poured into, thus having less strength in critical areas due to the non-uniform grain structure. Cast Mustang 2 spindles can fail with hard driving, whereas the forged Mustang 2 spindles are the strongest you can get.

Our Forged Spindles Accept All Factory Mustang II Suspension Components, Bearings, And More

If you’re running original cast Mustang 2 spindles, or early aftermarket cast spindles you owe it to yourself to run the strongest spindle available for your safety and peace of mind. Our forged Mustang II spindles provide the perfect foundation for installing big brakes and tackling a road course or autocross without fear of snapping a spindle pin or “candlestick” as some call it. Best of all, these forged and heat-treated spindles directly replace your stock cast pieces with zero modifications on your Mustang II IFS kit. These forged spindles feature the same ball joint taper, steering arm length, overall height, and more. They accept all stock Mustang II wheel bearings and seals for a complete and easy conversion (don’t forget new spindle nut hardware too!). The stock pin height means you maintain stock ride height (or whatever ride height your coilover shocks are adjusted to), but if you need to go lower, we do offer forged 2-inch drop spindles as well. These Mustang II drop spindles offer the same strength and bolt on design with a built-in two-inch lowered ride height.

Speedway Motors 91034307 Specifications

KEY SPECS
MFG. Part #91034307
BrandSpeedway Motors
PositionLeft and Right
Spindle StyleFord Stock
Spindle DropStock Height
Brake System TypeDisc
Material TypeForged Steel
Snout MaterialForged Steel
FinishNatural
ColorNatural
King Pin IncludedNo
Hardware IncludedNo
Suspension Height AdjustmentStock Height
GENERAL
Overall Height7.625"
Sold in QuantityPair
NotesReplacement for '74-'80 Pinto/Bobcat and '74-'78 Mustang II.

Ratings & Reviews

4.9

51 Reviews

Overall Assessment

Customers highly commend the product for its solid construction, quality, and practicality. Many users found it easy to install and it fit perfectly on their vehicles, eliminating issues such as ineffective spindles and tire rub. Some even praised the product's competitive pricing, mentioning it as a great value product that delivers excellent quality. Its durability and sturdy design were repeatedly praised, emphasizing its superior performance over competitors. Issues with machining were occasionally highlighted, but overall, the product was highly recommended for purchase again. Despite minor criticisms, the product was lauded as a reliable solution for various vehicle models.

4.9

51 reviews

5

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Most Liked Positive Review

5.0

Building to race

I created a build list of all the items that I need. It made it easy for me to compare parts and remember what I looked at. Now I am just buying as I can afford them and building an amazing car. Great product, parts, delivery, and ease of ordering!

Most Liked Negative Review

3.0

No

the left front spindle had a ridge where the taper met the spot that the inner bearing sits and I was unable to get the inner bearing on. It fit on the right spindle fine. So with some fine emery cloth and a lot of polishing and a little cussing I was able to get the bearing past that spot and in the location. You could feel the ridge very easily. I measured the rough spots and they were .003 larger than the spot where the bearing sits. I wasn't real pleased the way it was machined.

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They seems nice

5.0

25 days ago

Probrd

Athens

Verified

They seem like a good product but they didn't work for my TCI front end so I'm stuck with them since I installed them already.

Would Recommend

These spindles worked very well. Fit was perfect.

5.0

5 months ago

Tim

Westminster, co

Verified

I purchased the spindles to replace the 2" drops that I had from a different manufacturer who had closed up shop. Fit was perfect.

Would Recommend

I would buy again

5.0

5 months ago

Poorboy

Topeka,KS

Verified

I'm putting them on my race car rebuild

Would Recommend

Great quality spindles

5.0

a year ago

Russ

Red Bank, NJ

Verified

Spindle installation went fantastic. Wanted to raise the car up, therefore the return to the stock spindles.

Would Recommend

I would recommend this product.

5.0

a year ago

Dave

Covington, LA

Verified

I installed this product on my 62 Ford F100 truck

Would Recommend

I would purchase and recommend this item again

5.0

a year ago

Dave

Covington, LA

Verified

Rebuilding my 62 Ford F100 front end. It was a good fit.

Would Recommend

Just want I needed

5.0

a year ago

mleonber

Owensville Indiana

Verified

I installed on the Mustang II front end on my 35 Willys panel

Would Recommend

Good quality

5.0

2 years ago

Moe

South FLORIDA

Verified

It fits just right

Would Recommend

I would buy this product again

5.0

2 years ago

K

NY

Spindles fit as they should, they look like good quality for a good price!

Would Recommend

Works great

5.0

2 years ago

Mr Z

Texas

Verified

Pretty straight forward. One thing that i, like many others, fail to take a look around and make sure that we have EVERYTHING on hand to do the task. Otherwise we pay for multi shipping and that is not good.

Would Recommend

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Showing 10 of 51 reviews

Questions & Answers

13 Questions • 13 Answers

Where can I find detailed dimension drawings for these spindles 91034307?

by Perry

• 3 years ago

1 answer

What is the pinion angle?

by kft42073

• 3 years ago

1 answer

I am currently running the 910-34307 on your bolt in mustang II kit. What is the part # for the 2 inch drop version of this spindle.

by Andy

• 7 years ago

2 answers

I have a mustang 2 suspension installed on my 52 Chevy truck. Will these replace the drop spindles back to stock and do they accept the GM rotor mounting brackets

by John

• 8 years ago

2 answers

I have the Mustang II 11" Disc brake kit (unfortunately did not include spindles) to upgrade the front brakes on a 1957 Plymouth Belvedere. Will these brake spindles work? if not what will and do you have them? Has 6.1L bored to 440 ci, 45R15 front tires,PS

by Gary

• 10 years ago

1 answer

How tall are these from bottom side of spindle where the bottom ball joint sits to the top ball joint side?

by Jon

• 10 years ago

1 answer

is the original casting number the 74-78 mustang II 52-8-AA 173 and 52-7-AA 188 or is it the pinto or are they the same

by craigo

• 10 years ago

1 answer

What size ball joints for this spindle. Both upper and lower. I am replacing the spindle on a mustang II front end and don't want to have to replace control arms to accommodate different size ball joint.

by Vance

• 10 years ago

1 answer

Hi, Will these work with your kit: Part # 91031944 ? Lance

by Lance

• 11 years ago

1 answer

are these front or rear steer?

by vernont

• 12 years ago

2 answers

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