C4 (84-96)

C4 BOSE WOES: Repairing & Replacing 84-96 Bose Speakers & Amps

by Chris Petris

lead shot

If you own a C-4 equipped with Bose sound system, you will eventually need Bose amplifier repair or replacement. Every Bose sound system equipped C-4 uses one amplifier per speaker. This is the weak link. Amplifier capacitors are filled with electrolytic fluid which ultimately leaks out onto the circuit board causing failure. If the leak is slow, the amplifier’s circuit board can be damaged beyond repair. Electrolytic fluid is acidic and will corrode anything it touches.
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C5 (97-04)

C5 Oil Pressure Sending Unit Replacement

by Chris Petris

If you haven’t already replaced the oil pressure sending unit (CC part # 305254) on your C5 Corvette, it will become a necessity when the gauge stops functioning properly. One telltale sign is the oil pressure gauge needle leaning past the high mark at all times or not moving from the lowest point. Another sign is an oil leak near the rear of the oil pan. Many times, the presence of oil is mistaken for a leaking rear main seal; always look at the top of the bellhousing for the source of a leak. If there is a trail of fresh oil cascading over the bellhousing, chances are the sending unit is leaking. Sending units have an immediately noticeable leak, whereas rear main seals usually experience a slow leak that increases over time.

C5-Oil-Pressure-Sensor-Replacement-Lead-Shot
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Body & Paint

84-96 Door Outside Seal Strip Replacement

84-96 Door Outside Seal Strip Replacement

By Chris Petris

Automotive door sealing technology has improved dramatically from the early days when rain water came in from all angles. By 1969 GM changed the outer seal strip that wipes the glass clear on those damp mornings to do a good job of keeping water out of the door. In turn it kept water off of the door internals and off the backside of the fiber door panels. By 1984 the door outside seal strip was an integral part of door glass sealing. The downside was they were the most exposed seal strips to date subjecting them to the effects of UV deterioration much quicker than previous year Corvettes. You can help keep them around longer with an application of rubber protectant to replace the rubber solvent compounds removed after each wash job. Products like Adams V.R.T. Vinyl Rubber and Tire Dressing from Corvette Central P/N 106824 will keep your outside seal strips looking good for many years. This dressing brings back that new look without that greasy oily slick look, you can also touch it without fear of it coming off on your hands or clothes.

C4 Outside Seal Strip Replacement Lead Shot (1) (Medium)

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C1 (53-62)

The Other Way Of Stopping Wilwood C1 Front Disc Brakes

The Other Way Of Stopping Wilwood C1 Front Disc Brakes

By Jay Heath

1958-chevrolet-corvette-wilwood-caliper-closeup.1

Wilwood front disc brakes help turn our fishtailing ’58 into a decelerating dynamo

As recent auction results make clear, ’53-’62 Corvettes continue to rank among the most desirable U.S.-built vehicles in the collector-car marketplace. Credit the car’s historical significance and timeless good looks, traits blissfully undiminished by the inexorable forward marches of time and automotive technology.

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C5 (97-04)

1997-2013 Rear Anti-roll / Sway Bar Link Replacement

1997-2013 Rear Anti-roll / Sway Bar Link Replacement

By Chris Petris

When we had a chance to look under the first C5 in 1997 it was hard to believe a performance vehicle would have a plastic anti-roll (sway bar) link. To make things difficult lock nuts were used to hold the links stud into the control arms. That meant when someone removed the end link chances are they would rip the joints seal because they did not hold onto the stud during removal. The original plastic sway bar end links flexed under hard cornering making the anti-roll bar less beneficial. Of course a hard driving Corvette owner might break one or more on a track day. By 2002 GM finally dropped the plastic pieces replacing them with an aluminum anti-roll bar end link. One of the few things that did occur positive is the same end link is used from 1997-2013 so you can easily find and replace the weak original 1997-2001 links. If someone was not being careful and tore the end link seal during suspension service you may need to replace one or more on your 2002-2013 Corvette.

Corvette Central has the anti-roll bar end link you need in stock form or heavy-duty performance Heim joint style end links. The installation is simple and does not require much time or many tools to complete. We often replace the end links when replacing shocks making a simple job even easier. The most important thing to remember when replacing the end links; the wheels should be hanging free on the front or rear. If one wheel is hanging free and the other wheel is loaded the end link will also be loaded making it difficult to remove and possibly dangerous. This is not something you can do by jacking up one side of the Corvette at a time; it must be done with the front or rear jacked up. The following photos will show you how it’s done.

Anti-roll Bar Link Replacement 01 (Medium)

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C5 (97-04)

1997-2013 Shock Absorber Information and Replacement

1997-2013 Shock Absorber Replacement

By Chris Petris

Shock absorbers are considered a consumable product with a limited lifespan here’s why…

Shock-mono-tubeThe C5 Corvette shock absorbers and C6 Corvette shock absorbers are both Mono-tube design. Mono-tube shock absorbers construction begins with a single cylinder (tube) filled with hydraulic fluid. Another piston is used to separate the gas charge from the oil charge. Together the hydraulic oil and high pressure gas with proper valving dampen suspension oscillations. The rod that protrudes out of the cylinder is connected to a piston with seals to keep fluid in check. Another seal is used at the end of the cylinder where the connecting rod comes out to keep the fluid and gasses in while trying to keep debris out. One of the major benefits of mono-tube shocks is the pressurized gas is separated from the oil via a piston. The constant gas pressure on the hydraulic oil minimizes aeration of the hydraulic oil preventing foaming. Foam affects shock absorber performance because it can be compressed while fluid cannot, in turn; the shock reacts quicker with predictability. Overall suspension performance is enhanced with quicker reaction times with the tire on the pavement as much as possible.

Now we delve into the controversial subject of when shock absorbers should be replaced.

The shock absorber piston seal wears from rapid movement depending on how rough the road surfaces you traverse. Also dependent on the environment the shocks rod end seal wears from grit, dust or just plain dirt that coats the shocks rod surface. A light film of oil is present on the exterior of the shock absorbers exposed connecting rod attracting debris which is unavoidable. You can expect to see evidence of slight seepage on the shock absorbers cylinders exterior over a long period of time. It appears as a stain not wet to the touch, if there is a film of oil present on the exterior of the shock absorber, emanating from the rod end seal area, the shock absorber should be replaced. Read more on “1997-2013 Shock Absorber Information and Replacement” »

C4 (84-96)

Corvette Rear Suspension Bushing Installation and Component Installation

By Chris Petris
Petris Enterprises

This is the third installment of a C4 suspension overview series. Click to view the first article, Click to view the second article.

In this installment, we tackle the rear suspension bushing installation and component installation.

So far I have covered all the C4 suspension disassembly and have the front suspension assembled. I have also shown how to remove the rear suspension bushings for urethane bushing replacement. Early on we discussed the

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availability of rubber bushed suspension components. Corvette Central does have the spindle rods available with rubber bushings (584150 Set of 4) or with polyurethane bushings (584090 Upper, 584108 Lower). Camber strut rods are also available with rubber bushings (584151 84-89, 584097 90-96 used/Reconditioned). Corvette Central also stocks good used certified suspension pieces that have gone through an inspection process to assure the best possible condition from a previously used piece. Whether you choose rubber or urethane, I will cover the required steps to install the urethane bushings and all the suspension components. Before we get started assembling, there are a few items to cover concerning the rear suspension.

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C4 (84-96)

How do I install the new polyurethane rear differential bushings on my 84-96, as the bushing seems too large to fit?

C4 batwing bushing sleeveThe polyurethane bushings for the rear differential carrier or “batwing on a C4 measure 2 1/8” diameter on the portion that fits into the carrier hole.  When You press the original rubber bushings out, there is an outer “sleeve” from the bushing that remains.  This has to be removed as well.  One simple way to remove these sleeves is to cut them into a few sections with a hacksaw blade, then use a hammer and punch to drive them out.  Once that is done, the new polyurethane bushings should press in without a problem.