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Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember

Specs
Material Type:
Steel
Sold in Quantity:
Each
Finish:
Natural
Hardware Included:
Yes
Material Thickness:
.19
Garage Sale:
No
Notes
Includes crossmember, spring towers, threaded adjusters, and mounting plates.
Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember
Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember
Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember
Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember
Bolt-In 1947-54 Chevy Pickup Mustang II Crossmember

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

Our bolt-in Mustang II suspension kit for 1947-1954 Chevy half-ton and 3/4 ton pickups includes all hardware and instructions. 

  • Completely bolt in - no welding required
  • Based on proven Mustang II geometry
  • Complete with bolt in boxing plates to reinforce the frame
  • Interlocking design for ultimate strength
  • Threaded adjusters to fine tune ride height
  • Full lower A-arms required with this crossmember (strutless type)
  • Requires the use of a power rack and pinion and tubular control arms
  • NOT for use with air ride

910-44754 Instructions (PDF)

Note:  Use bolt-in motor mount kit 910-54754 to mount your S/B Chevy.

Notes

This bolt in unit is ONLY made to fit a 47-54 Chevy 1/2 ton and 3/4 Pickup chassis. Inside dimension at axle centerline is 23-1/2", outside is 28". This frame is slightly tapered to the front. Standard MII spindles will set pin at 1/2" below frame rail and 2" drop will set it at 1-1/2" above. Track width is standard 56-1/2" depending on which brake kit is used.

Customer Reviews

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

manofthehour114
Mountain Home, ID 83647, USA
Product Rating

Great Quality

May 27, 2014
I was very surprised with the quality and the installation was easy despite having to trim the width of the frame rails and part of the radiator support. I would have liked for it to come in a kit with the complete hub to hub assembly and engine mounts, but it's not a big deal.
Pros:
  • Very sturdy
  • Easy To Install
Cons:
  • should be included as kit with hub to hub assembly
Yes, I recommend this product.
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49Chevy
Jackson, MI, USA
Product Rating

Great product, easy installation

September 19, 2013
Great product, went together quite easily, just follow the instructions. Very good quality. Looks great. Very pleased.
Yes, I recommend this product.
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Was this review helpful? 0 0

Page 1 of 1

Product Q&A

15 questions : 16 answers

Why won't this bolt in kit work with air bag set up? I'm hoping to use this bolt in kit with tubular upper and lower control arms and want to use air bags instead of coil overs. Is possible to still use the air bag kit, and weld on the shock tower?

1 answers
1950chevylsswap
January 28, 2015

Why won't this bolt in kit work with air bag set up? I'm hoping to use this bolt in kit with tubular upper and lower control arms and want to use air bags instead of coil overs. Is possible to still use the air bag kit, and weld on the shock tower?

Answers

January 29, 2015
EricM
The adjustable upper spring mounts require modification to be able to mount the air bag. Also you will have to weld on shock mounts. With the amount of fabrication and welding involved in making this work with air bags you would be just as well off with a weld in crossmember. Its not that this crossmember could never be used as an air bag setup, just that the amount of work/welding to do so would mean that you also have the means to use a weld in crossmember (which will be easier to use for your intended purpose.)

With this install can you get the LS motor mounts? I have a 1952 GMC I want to do this install as I have no acess to a welder I like this option, However I know on some other kits the motor mount can be adapted for an LS motor. Am I overlooking it on your website?

1 answers
JeffNos
CO
January 27, 2015

With this install can you get the LS motor mounts? I have a 1952 GMC I want to do this install as I have no acess to a welder I like this option, However I know on some other kits the motor mount can be adapted for an LS motor. Am I overlooking it on your website?

Answers

January 30, 2015
Tech
We offer a bolt on motor mount kit, part number 91054754, and if you combine that with part number 91618016 you can bolt an LS engine into your frame.

Why can't this crossmember be used with air ride?

1 answers
Chevy3100
Mansfield, OH, USA
August 22, 2014

Why can't this crossmember be used with air ride?

Answers

August 22, 2014
EricM
This crossmember is not applicable to an air ride front end configuration because the top control arm hats are not design for proper installation of the air bags.

will the complete hub to hub kits bolt in type fit a 1954 gmc 3/4 ton ? also would need a 5x5.5 bolt pattern on rotor for the wheel

1 answers
72rtchallenger
Winchester, KY 40391, USA
July 15, 2014

will the complete hub to hub kits bolt in type fit a 1954 gmc 3/4 ton ? also would need a 5x5.5 bolt pattern on rotor for the wheel

Answers

July 16, 2014
EricM
Yes this will fit your 3/4 ton GMC but I do not offer a 5 on 5 1/2" bolt pattern. 5 on 4 1/2" or 5 on 4 3/4" only.

What is the reason you can't use a mustang II manual rack and pinion

1 answers
LittleJoe
Collinsville, IL, USA
May 19, 2014

What is the reason you can't use a mustang II manual rack and pinion

Answers

May 19, 2014
Travisp
On the manual rack the input shaft sits too close to the cross member to alloy hook up of the U-joint. If you have to run manual you will need to modify the crossmember without sacrificing strength.

Is this IFS will work with the stock 6 inline engine? or only the V8 engines?

1 answers
Meshal
Daytona Beach, FL, USA
May 10, 2014

Is this IFS will work with the stock 6 inline engine? or only the V8 engines?

Answers

May 12, 2014
EricM
The stock inline six will have pan clearance issues with the bolt in cross member for the 47-54 Chevy pickups. Elevating the engine or modification of the cross member would be required.

Installation I currently have a 261 CID 6 installed with front motor mounts. Can this crossmember be installed without removing the motor?

1 answers
GeeMSee
Michigan, USA
February 28, 2014

Installation I currently have a 261 CID 6 installed with front motor mounts. Can this crossmember be installed without removing the motor?

Answers

March 03, 2014
EricM
No you are going to have to remove the engine to install this crossmember. The engine will be in the way for drilling the holes required to bolt this in place. Even if it were possible to leave the engine in place to install the crossmember it would make the work of installation take so much longer that you would not be any further ahead leaving the engine in. Installing a Mustang II suspension is a major project whether using a bolt in or weld in crossmember.

Total width? When paired with the coil over suspension package (91034206) what is the total width (wheel mounting surface to wheel mounting surface)?

1 answers
GregR
Minnesota, USA
March 24, 2013

Total width? When paired with the coil over suspension package (91034206) what is the total width (wheel mounting surface to wheel mounting surface)?

Answers

March 26, 2013
Jason
Bolt in cross member number 91044754 accepts any of the tubular control arm Mustang II hub to hub kits with either standard springs and shocks, coil overs, or air ride. With the 11” rotors the Ford bolt pattern nets a 57.5” track width which is hub face to hub face and the Chevy bolt pattern has 58.5” track width.

Will this work for 1946 chevy truck? If not are there plans to make kit for a 1946 chevy truck?

1 answers
racer9
IL
March 12, 2013

Will this work for 1946 chevy truck? If not are there plans to make kit for a 1946 chevy truck?

Answers

March 12, 2013
Jason
Pre 1947 GM pickups carried different dimensions and we apologize but do not offer a bolt in cross member kit for those years. Speedway does offer a weld in kit under number 9103443 if that would be of interest.

Do I have to use Mustang II suspension parts for this kit? Will Chevy suspension parts work?

2 answers
weroot4ku
Inman, KS 67546, USA
January 25, 2013

Do I have to use Mustang II suspension parts for this kit? Will Chevy suspension parts work?

Answers

February 27, 2013
homshillbillyhotrods
yes mustange ii arms,rack and the spindle kit with your choice of rotors
January 25, 2013
Jason
This bolt on Mustang II crossmember for the 1947-54 Chevy pickups must be used with non-strut rod type offset tubular lower control arms. The crossmember will not work with stock type or OEM type lower control arms that make use of a strut rod
Page 1 of 2

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  1. Add proper crossmember to complete kit.

Spring Rate Chart (Link)

Note: Additional items may be needed to complete installation.  You may want to include our Mustang II ride height adjusters (91034444) for installation with these IFS kits to fine tune your final ride height up to 2".

Note:  If using these kits with Speedway or Heidts crossmembers for 1948-1956 Ford Pickups, 1955-1959 Chevy Pickups, or universal crossmembers for 27-1/2" - 33-1/2" frame widths, you will be required to purchase 2" Inner Tie Rod Extensions (91034345) or (91034346).

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  1. Add proper crossmember to complete kit.

Spring Rate Chart (Link)

Note:  OEM rubber brake hoses generally cannot be adapted to Wilwood calipers. The caliper inlet fitting is a 1/8-27 NPT. The preferred method is to use steel adapter fittings at the caliper, either straight, 45 or 90 degree and enough steel braided line to allow for full suspension travel and turning radius, lock to lock.

Note:  If using these kits with Speedway or Heidts crossmembers for 1948-1956 Ford Pickups, 1955-1959 Chevy Pickups, or universal crossmembers for 27-1/2" - 33-1/2" frame widths, you will be required to purchase 2" Inner Tie Rod Extensions (91034345) or (91034346).

Steel Hex Wrench for Bolt-In Mustang II Ride Height Adjusters
(Part #91034613)
                        

This steel hex wrench is for adjusting our Mustang II Ride Height Spring Adjuster Kit 910-34444, which is also found on our Mustang II Bolt-In Front Crossmembers 910-44754 (1947-54 Chevy pickup) and 910-43540 (1935-40 Ford car/pickup).

Measurement across the hex is 2.38".

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Build a firm foundation for your vintage Chevy pickup without picking up a welder! This innovative line of chassis components from Speedway Motors allows the do-it-yourself rodder to assemble a frame using only basic hand tools and a drill.

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910-64754 Instructions (PDF)

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910-84754 Instructions (PDF)

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910-54754 Instructions (PDF)