1979-04 Ford Mustang J&M Upper Control Arms by J&M Products

Mustang J&M Upper Control Arms (79-04)

Details   |  Description   |  Customer Photos   |  Reviews
  • J&M Mustang Upper Control Arms (79-04) 23970B
J&M Mustang Upper Control Arms (79-04) 23970B

Looking to make your Mustang faster off the line and more stable in the corners? Grab a set of these J&M Rear Upper Control Arms to get your Mustang launching harder and faster than ever!

Item #JM-23970B
MPN# 23970B

Your Price: $123.24

Market Price:$141.36
You Save 12.82 % ($18.12)

In Stock


Add to cart

Our call center is closing at 3pm today. Please direct all communications to customerservice@lmr.com or submit a contact request online here.


  • Increased Traction
  • Quicker 60 Ft Times
  • Firms Rear Suspension


  • Black Powder Coated Finish
  • Bind-Free 3-Piece Poly-Ball Bushings
  • Tubular Design

What's in the Box

  • (2) Upper Control Arms

Made in the USA

Product Description

Replace your Mustang upper control arms with a set of J&M Mustang Rear Upper Control Arms for better, faster launches and to eliminate that uncomfortable feeling of "wheel hop" under heavy acceleration or braking.

Better Than the Competition. Unlike other products, the J&M Rear Upper Control Arms use a patented design to keep your Mustang's rear end planted when you mash the gas on the starting line while also improving your handling. Their unique 3-piece "Poly Ball" bushing allows your control arm to move freely when you're carving the corners but keeps it stiff when you're romping on it on the strip or slamming on the brakes.

Bushing Lubrication
The suspension bushings included with this part can only be lubricated with PTFE grease, also referred to as "Marine Grease". PTFE grease is a very sticky, opaque grease that is water proof and will not degrade the bushing material. If lubed properly at installation, these bushings will not need to be lubricated again. Use of any other grease on these bushings will cause the bushing to fail and any bushing warranty to be voided.

See what our customers have to say about this product!
Check out customer reviews.

Customer Photos (1)

Product Reviews (5)

out of 5 stars
4 stars
5 reviews
5 stars    4
4 stars    0
3 stars    0
2 stars    0
1 star    1

4 of 5 REVIEWS
4 of 5 REVIEWS

5 Stars   Quality Part, Stock Ride
By on 7/4/2016
This is the first time I have ever felt compelled to login and review a product on LMR. I put these on my 2000 GT. The car previously had UPR LCAs and SVE UPCAs. It was that way when I bought it.

The car always road harshly, and the UPR bushings were shot. When I called UPR for replacements, the cost was almost as much as new arms. I wanted For Racing UCAs to put the car back to a better ride while still strong (getting older).

This is the best bushing option next to OEM rubber. Installing the bushings on the J&M unit is a little tricky. But, it is well worth it. The ride quality is awesome, and the car still launches well. I would add that I replaced the axle side bushings with new OEM rubber as well. I am also running the J&M adjustable height LCAs. I highly recommend this product!

Yes, I would recommend this item to a friend!

Was this review helpful to you?

5 Stars   Great quality!
By on 4/21/2015
Image uploaded by Brett B. I bought these arms to replace a previous set that the bushings prematurely failed. These installed easily, and I felt an immediate improvement of rear axle stability. Great product. Looking forward to these standing up to the power and abuse I will throw at them.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

5 Stars   Good quality
By on 8/26/2015
I bought these to replace my previous aftermarket uppers because the bushings were shot. They are thicker and in my opinion a more rigid design. Tightens up the rear and no more popping with the 3 piece bushing.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

5 Stars   Great product
By on 2/24/2014
Tightened up rear end and allowed more exhaust clearance.

Yes, I would recommend this item to a friend!

Was this review helpful to you?

1 Stars   Problems
By on 9/22/2016
I didn't notice until after I installed the driver side that One of the balls was a hard plastic unlike the previous one I installed. It's hard as a rock and will not go in. Not sure what to do since I have one control arm installed. Hoping to get a hold of LMR in the morning and see if they will send me one of the right rubber balls. I'm glad it's not my daily driver or I would be screwed . Also if you're installing these with a set of prothane axle bushings be prepared for a really tight fit. I ended up using a C clamp to finally get it on .
From LMR.com: Thank you Derek for contact us and getting the issue resolved. Please feel free to contact us at 254-296-6500 or via email. Thank you
Was this review helpful to you?

Vehicle Applications

Ford Mustang - 1979 (79) - 1980 (80) - 1981 (81) - 1982 (82) - 1983 (83) - 1984 (84) - 1985 (85) - 1986 (86) - 1987 (87) - 1988 (88) - 1989 (89) - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93) - 1994 (94) - 1995 (95) - 1996 (96) - 1997 (97) - 1998 (98) - 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04)

About This Brand

J&M Products
J&M Products has been a world leader in the design and manufacturing of automotive suspension since 1996. Their products are built in our modern production facilities, years of research and a constant commitment to innovative technologies and manufacturing methods.

J&M Products' new product development is a result of our commitment to performance products that deliver results. Each new component must pass both quality and performance evaluations prior to a manufacturing commitment.

The flexible manufacturing process provides large volume production of specialty components for your Mustang or Lightning as well as accommodating the complexities of the small run direct-fit components. Their modern factory incorporates highly precision automated methods with the capabilities of holding a tolerance of + or - .0001 inches to insure product consistency at the highest quality levels and competitive pricing.

Shop LatemodelRestoration.com for your J&M caster camber plates, stainless steel brake lines, lower control arms, and other high quality Mustang components.

Look for Similar Items by Category

Ford Mustang Parts » Mustang Suspension & Chassis » Mustang Rear Control Arms » Mustang J&M Products Rear Control Arms
Ford Mustang Parts » Mustang Suspension & Chassis » Mustang Rear Control Arms » 1979-1993 Fox Body Mustang Rear Control Arms
Ford Mustang Parts » Mustang Suspension & Chassis » Mustang Rear Control Arms » 1994-2004 Mustang Rear Control Arms
Top Mustang Suspension Parts » Top 94-04 Mustang Suspension Mods

Products by Vehicle