MOOG CC635 Rear Variable Rate Coil Springs - Pair

  • moog-cc635 Rear Variable Rate Coil Springs - Pair

Rear Variable Rate Coil Springs - Pair

Manufacturer: MOOG
Part Number: moog-cc635
Price: $71.71

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  • Moog fulfills their warranty through their individual dealers. That means that in order to receive warranty support, you will have to refer back to the original dealer you purchased the part from. Be sure to check the dealer's warranty support before you buy the part to make sure that they will properly support the warranty. If a dealer will only refer you back to the manufacturer in order to receive warranty support, then you may not actually have any warranty at all.


    Moog Premium Steering Components carry a Limited Lifetime Warranty. Moog R-Series Control Arms, Hub Assemblies, and Strut Assemblies carry a 3 Year Warranty.

    Moog warranties their parts to be free of defects in materials and/or workmanship during these timeframes as measured from the date of purchase.

    If a Moog part should fail due to materials or manufacturing defect while under warranty, we will provide a replacement of the part upon return of the defective part.

FitmentRear Variable Rate Coil Springs - Pair moog-cc635 fits these vehicles:
Fits 1991 Camaro RS Submodel 5.0L V8
Fits 1982-1986 Firebird 2.5L L4
Fits 1982-1989 Firebird 2.8L V6
Fits 1982-1991 Firebird 5.0L V8
Fits 1987-1991 Firebird 5.7 L V8
Fits 1990-1991 Firebird 3.1L V6
Fits 1982-1989 Trans Am 5.0L V8
Fits 1987-1988 and 1991 Trans Am 5.7L V8

Moog's Coil Springs

Designed to be more than OE replacements, Moog's coil springs come with a variety of shapes and ends. This selection, combined with Moog's lifetime warranty handled right here at DST, lends security to whichever choice you might make. While they are certainly higher quality than the OE springs, each of Moog's coil springs were designed to still have the same spring rate. Having the same spring rate allows for an easier install and a more accurate restoration for your vehicle's ride.

End Type

Coil Springs have three types of ends: Square, Tangential and Pigtail. It is important that you select a coil spring that matches BOTH your end types, otherwise the coil spring won't fit. Your OE coil spring could have the same type ends, or a combination of both.

Moog Universal Coil Springs Squared

Type 1: Squared

With a Squared end, the final coil is bent back to touch the coil before it. The easiest way to know if you have a squared end is to stand the coil spring straight up. A squared end will let the spring sit flat on the ground and stay standing.

Type 2: Tangential

A Tangential end looks like it would just keep on going forever if the spring continued. The last coil is not bent back and it is not the pigtail (see below). Instead, the tangential coil spring looks as though a normal coil was just cut, otherwise, it would have kept winding on forever. If you tried to stand it up straight, it would fall.

Moog Universal Coil Springs Squared
Moog Universal Coil Springs Squared

Type 3: Pigtail

The Pigtail is probably the easiest to identify. Its defining characteristic is the pig tail shape at the end. The final coil is squared off, but is a much smaller diameter than the rest of the spring.

Spring Type

Moog offers two types of springs for a universal fitment: Constant Rate and Variable Rate.

Constant Rate

Moog Constant Rate coil springs return your vehicle to the original specifications. The rate at which the spring compresses and rebounds remains constant regardless of the amount of load on the spring. These coil springs are heat treated, have a weather resistant finish and use a urethane protective tube.

Moog Universal Coil Springs Bar Diameter
Moog Universal Coil Springs Bar Diameter

Variable Rate

Moog Variable Rate coil springs can be used as an original replacement or an upgrade to carry heavier loads. The resistance changes as the spring compresses, becoming progressively stiffer as the load on the springs increase. The springs include a "comfort range" with tightly spaced coils to give a smooth ride, and include a "load range" with widely spaced coils to minimize deflection and maintain chassis height when the vehicle load increases.

MOOG moog-cc635

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MOOG moog-cc635

5 out of 5 based on 1 user reviews. Write a Review


starstarstarstarstar" thoroughly impressed "

The car is a 2001 camaro ss with 80,xxx miles. The suspension on these cars are known for being harsh at times. I installed all new bilstein shocks over the winter and reused my stock springs hoping to get a smoother ride over bumpy roads. That did not seem to help very much. a year after I installed some sound deaden-er in the hatch area which caused the rear end of the car to sag. Most aftermarket springs would lower the car and that Is not what I wanted, finally i found these. Ive contemplated going as far as air ride suspension and koni adjustable s to get a better ride.($$$$) After installing these springs the difference was night and day, more than I had anticipated. It brought the rear end of the car up an inch, right back to were I wanted it and going over bumps is 10 times better. This made a huge difference for me, it really brought some relief/joy back into to driving my car again!

verified_user Verified Buyer - - . MOOG moog-cc635 - 5 out of 5
Fitment for moog-cc635
MakeModelYear RangePositionDrive WheelQuantity RequiredEngine BaseEngine VINEngine Designation
ChevroletCamaro2002-1982Rear Quantity 1
ChevroletCamaro1991Rear Quantity 1 5.0L V8 305cid
PontiacFirebird2002-1992Rear Quantity 1
PontiacFirebird1991-1990Rear Quantity 1 3.1L V6 189cid
PontiacFirebird1991-1987Rear Quantity 1 5.7L V8 350cid
PontiacFirebird1991-1982Rear Quantity 1 5.0L V8 305cid
PontiacFirebird1989-1982Rear Quantity 1 2.8L V6 173cid
PontiacFirebird1986-1982Rear Quantity 1 2.5L L4 2474cc/151cid

question_answer Customer Questions and Answers

What is the spring rate of part number cc635?
Part number cc635 has a spring rate of 104 lbs per inch.