Gmc Rod Bearings

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Gmc Rod Bearings
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Tremec is an OE transmission supplier that manufactures manual transmissions for Ford, General Motors, Chrysler, Aston Martin, TVR, and many different medium and heavy duty truck applications. Their TKO is a high strength 5-speed overdrive manual transmission that was originally designed to be retrofitted into Mustang Fox body cars to replace the weaker T5, but will also bolt up to the standard Ford four speed passenger car bellhousing. When Tremec realized that enthusiasts were adapting it for GM applications, they decided to make it a little easier for folks (and capitalize on a huge opportunity, too) by producing a GM version of the TKO.

The GM version will bolt directly up to almost any standard Chevrolet/Buick/Olds/Pontiac passenger car four-speed bellhousing. Though only Ford and GM versions of the TKO are available, Mopar enthusiasts can get all the custom parts they need to adapt a Ford version TKO to virtually any Mopar V8 engine. The TKO has never been OE equipment in any production car, although its great-grandpa, the Tremec TR-3550 was in a limited-production Ford Mustang Cobra in the mid 1990s. The TKO is purely an aftermarket transmission designed for high-performance cars.

There are three basic models available, the TKO-500 and two variations of the TKO-600. The wide-ratio TKO-500 is rated for a continuous 500 lb.-ft. of torque, and offers a deep 3.27:1 first gear ratio and a 0.68:1 overdrive ratio in fifth gear. The close-ratio TKO-600 is rated for a continuous 600 lb.-ft. of torque, and has a 2.87:1 first gear and either a 0.82:1 overdrive or a 0.64:1 overdrive ratio in fifth gear. The rated torque capacities are said to be quite conservative, as there are a significant number of cars in the field with engines that exceed the torque rating by a large margin, and failures are rare.

The TKO uses a three-rail internal shift mechanism, eliminating any external linkage and the problems that go with it. The short throw billet aluminum shifter can be removed, flipped 180 degrees, and then reinstalled to provide an additional shift position. Optional custom shifters are available in several different configurations to mimic the shift positions in various musclecars. The TKO utilizes cast iron shift forks, a one-piece counter shaft, and tapered roller bearings on the input, output, and counter shafts for added strength.

Every TKO transmission provides both mechanical and electronic speedometer outputs. The mechanical output is a Ford design, but you can get hybrid speedometer cables for GM or Mopar applications. They also feature a reverse light switch and a neutral safety switch that can be wired into your vehicle's existing harness. The transmission has an internal reverse lockout feature that prevents you from accidentally going from fifth gear into reverse. You have to go into the center of the "Neutral" gate before it will allow you to shift into reverse.

The Tremec TKO is an excellent choice for the musclecar or street rod owner that enjoys rowing his own gears and wants to drive his car to distant car shows or other events. I have one in my 1967 Pontiac Firebird and have driven a number of other cars with TKO transmissions installed. The overdrive makes a huge difference on the highway, and there aren't many other transmission choices out there with overdrive that will stand up to the kind of power that the TKO can take. None of the other overdrive transmissions available at this time offer as much versatility as the Tremec TKO.

Keith Farren is an ASE Certified Master Technician with a BS in Business Administration, an Associate degree in Automotive Technology, and over twenty years experience in the automotive industry. He owns and operates two websites dedicated to classic cars, Classic Car Financing and Loans and Classic Car Prices Today. He also works for Keisler Engineering, a Tremec distributor that designs and sells all the custom parts you need to install a TKO into your musclecar or street rod. Give Keisler Engineering a call at (865) 609-8187.

Gm to Introduce New Duramax Engine

General Motors Corp. has announced that it will introduce a new, state-of-the-art 4.5L V-8 Duramax turbo-diesel that improves engine fuel efficiency by 25 percent, reduces CO2 emissions by 13 percent and cuts particulates and NOx emissions by at least 90 percent for North American light duty trucks and the HUMMER H2 built after 2009.

News reports are saying that the premium V-8 diesel is set to deliver class-leading torque, power and refinement while at the same time maintaining a significant fuel efficiency advantage over comparable-output gasoline engines.

“This new GM light duty diesel is expected to become a favorite among customers who require excellent towing ability and fuel efficiency,” said Tom Stephens, group vice president, GM Global Powertrain and Quality. “It will meet the stringent 2010 emissions standards, and it will be compliant in all 50 states, making it one of the cleanest diesel vehicles ever produced.”

The new dual-overhead cam, four-valve V-8 diesel engine will fit within the same space of a small-block V-8 gasoline engine. This compact size is made possible by using integral cylinder head exhaust manifolds, integral cam cover intake manifolds and a narrow block.

At this age and time, fuel efficiency is a big consideration for consumers. GM addresses this by offering environmental benefits from the new engine that include a 13-percent reduction in CO2 versus gasoline engines, and at least a 90-percent reduction in particulates and NOx compared to diesel vehicles today. This will be the automaker’s first engine to use a selective catalytic reduction NOx aftertreatment system with a diesel particulate filter to help achieve the Tier 2 Bin 5 and LEV 2 emissions standards.

“This new V-8 is not only a clean diesel meeting the toughest emissions requirements in North America, it also delivers an effortless performance feel because of its high torque across the speed range,” said Charlie Freese, executive director of GM Powertrain Diesel Engineering. “It is also significantly quieter than other diesels on the road today, with noise and vibration performance approaching gasoline V-8 levels.”

Technical highlights of the engine include aluminum cylinder heads with integrated manifolding; a variable-vane turbocharger with intercooling; a Compacted Graphite Iron (CGI) block for a stronger and lighter engine base (compared to lower-strength aluminum or heavier grey cast iron); and fracture-split main bearing caps and connecting rods for a precise fit. An electronically controlled, ultra-high-pressure, common-rail fuel system is used, which has the ability to inject fuel five times per combustion event to control noise and emissions.

Already anticipating future market demand, the new V-8’s compact size enables it to fit in the envelope of a gasoline small-block engine, providing GM the flexibility to introduce this engine in a wide variety of vehicle applications.

The premium V-8 diesel engine is expected to deliver class-leading refinement, horsepower and torque and fulfill multiple vehicle applications with ratings in excess of 310 horsepower and 520 lb-ft of torque.

There are 17 diesel engine variants in 45 vehicle lines around the world that GM (Opel, Saab, Vauxhall and GMDAT) currently offers. GM – which also makes top of the line GMC wheels - sells more than one million diesel engines annually, with products that offer a range of choices from the 1.3L four-cylinder diesel engine sold in the Opel Agila and Corsa, up to the 6.6L V-8 Duramax diesel sold in full-size vans, heavy duty pickups and medium duty trucks in the U.S.

The Duramax diesel 6.6L V-8 was first introduced by GM in the U.S. in the 2001 model year. Since then, customer satisfaction for this heavy duty diesel has been more than enthusiastic, helping GM’s heavy duty pickup truck market share to jump nearly tenfold after it was first introduced.

About the Author

Iver Penn is a Mass Communications graduate who hails from Wyoming. She is at present an associate editor of a publishing company in Colorado.

noisy flexplate or spun connecting rod bearings sound the same to me.?

I cant tell if I spun some bearings or my 1989 GMC S-15 has a broken flex plate. I actually witnessed my son fly over a washout down my road and saw the frame acually bottom out. could this have broken the flex plate ? It shakes like crazy when I start it and I have 50 psi on the oil pressure gauage, it increases the noise as the engine is sped up.. I cant find information on this anywhere. I cant really isolate the sound but it sounds the loudest directly behind the front WHEELS. I cant feel anything banging around in the bell housing. HELP ME MECHANICAL BRETHREN.
If I actually spun a bearing I would have lower or lost oil pressure wouldn't I ?

A spun bearing has a squeak and knock combination, once the bearing spins it can no longer get oil to lubricate itself and it wont be long until it seizes or throws a rod. So I would say if this happened right after you seen the frame hit hard, I would suspect flexplate.

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