7 3 cracked flex plate 454

Right off the bat, they said it didnt sound like piston slap. A vital part of an automobile engine equipped with automatic transmission, a flexplate consists of a piece of thick sheet metal that bolts to the crankshaft and torque converter. A cracked flex plate is usually a sign of other problems. Dont know why but at some point someone has replaced the motor. There are atleast 3 bolt holes on the flex plate these attach the flex plate to the converter.

Once the plate is removed, you will see the flex plate with gear teeth around it, and the round donutlooking torque converter. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the. Prw 1845400 sfirated external 168 teeth balance chromoly steel flexplate for chevy 454 197090, early. Because the flex plate is an integral part of your cars powertrain, and replacing it involves removing the transmission, a significant amount of labor will be involved. Has a billet torque converter installed about 5 yrs ago. Today is a great day to visit our store and order the parts you need for your truck. Theres also a chance they didnt gradually torque the bolts that hold the flex plate to the torque converter and maybe its not balanced. Discussion in the hokey ass message board started by jimv, jun 7. Rockauto ships auto parts and body parts from over 300 manufacturers to customers doors worldwide, all at warehouse prices. Ati sfi flexplates for racing automatic transmissions. Ats billet flexplates are sfi approved, meaning that they stand up to the toughest race application standards. The complete cylinder block guide for chevy small block engines how to build max performance chevy small blocks on a budget.

The problem turned out to be a cracked flex plate which is much cheaper than rebuilding or replacing the engine. Nov 16, 2006 the 3 prior flex plates have all been cracked starting at the bolt holes. I went from an externally balanced 454 to a internally balanced stroker 489 which. How to replace the flywheel in vehicles it still runs. Its called a flex plate because it has to flex fore and aft. There is a center plate under the bolts holding the flywheelsave this plate for the new flywheel. Commonly used on almost all small block 305 350 and big block marine. Difference between flywheel and flexplate it still runs.

Discussion in the hokey ass message board started by hudsoncustom, jun 19, 2007. There are a crapload of different flexplates for the 454 since it came with th350th4004l80etc. A bad flex plate usually has failed due to either damage or wear and tear, so replacement with a new flex plate is the only solution. Buy allstar performance all26800 168t sfi internal balance flexplate. Ati flexplates are created from custom drawn sfispec chromoloy steel and are sfi certified. Scat crankshafts fp454sfi flexplate for big block chevrolet. The 454 can be idd by the balancer having the inner hub cast with an integral counterweight see image below. You really should check the end play on the crank using a dial indicator should measure 0.

The flex plate is a steel plate that bolts to the rear of the engine and has gear teeth around it. If you really stop and think about a highhorsepower pro modified car planting the tires and launching. My 85 2001 started making ugly knocking popping sounds last wednesday and i was told it could be a broken flex plate, or a thrown rod in my. When replacing a flex plate big block chevy does the flex plate need to be balanced to the engine. The tci superquality flexplates are thicker than stock plates to withstand the stresses of todays high rpm engines and highstall torque converters. When replacing a flex plate big block chevy does the. Is it possible to install a flywheel backwards by accident. We just put the truck on the road at the end of last year. Shortly after i bought it the starter was lose and had a broken bolt and gear tooth looked a little rough changed. If you replace the flex plate and dont fix the real problem your flex plate will most. Flywheels and flexplates are two parts that help accomplish the same task in an automobile in. As i was driving into work this morning i noticed a sound that seemed to come from the middle of the car. They do run hotter than other small blocks because they are a siamese bore,no space in the block casting between the cylinder bores. Bad knock on engine people say flex plate on 1979 gmc 350.

The biggest issues that caused cracked plates other than age are misaligned oil pans and missing pilot bushings in the crank shaft. Allows use of a 350 flywheel on a 400 cubic inch small block chevy motor. Buy all types of transmission flex plates online at low prices. There is also a cover plate on the back of the engine. Flexplate, 168tooth, external engine balance, 2piece rear main seal, sfi 29. Im thinking broken flex plate in my 73 blazer however when im in gear low rpms and rolling down the street i hear the. Similar in function to a flywheel in manual transmission engines and called a flexplate due to its expansion, or flexing, during the. Difference between flywheel and flexplate by jacob stutsman. Remove the ten bolts securing the factory flex plate to the crankshaft.

In a 1976 chevy with a big block 454 can you use a 4 speed. Noise in my chevrolet silverado sounds like flywheel. These products are shortlisted based on the overall star rating and the number of. It is almost impossible otherwise to have a misalignment. At first i thought it was comin from the top but when i get under it its alot louder sounds like its comin from the. The weight on the flywheel is critical,or you can use a 350 flywheel with a balance plate sold by summit or others. Dec 11, 2017 i show you a nice trick to help you when changing your flex plate of converter. Whether you need stock, stamped, or heavyduty, tci forged flexplates are your performance solution.

No real heavy towing in the last 4 years, just a single jeep. There may be some external clues that will point more one way than another especially since the 454 was made for 30 some years. Nov 18, 2012 396 and 454 had different bore sizes so the blocks would have had to be different. Yesterday the flex plate on my 2000 toyota 4runner w 155k miles was replaced.

Tci forged flexplates 399973 free shipping on orders. The mobil 1 synthetic 530wt is dexos approved now and to my knowledge about 3 yrs. If the pin is missing, it must be replaced with a new pin from a ford dealer. The symptom was a ticking sound under certain conditions. Install the ats billet flexplate using the 10factory bolts. The flex plate replaces the flywheel in automatic transmission cars. Ati flexplates and adapter kits for street and race use. Tci 399554 454 flexplate external balance made by tci automotive, for as low. Make sure to place the flex plate over the alignment pin on the crankshaft. A 454 will also have a different flexplateflywheel, having an added counterweight that is.

As the torque converter spins faster it grows a bit fore and aft. I have a 1994 sea ray express cruiser with merccruiser 454 and bravo 1 outdrive. What are the likely causes of failure so maybe i wont do it again. Flexplate technology and choosing the flexplate for you. Weve got tough yet affordable flexplates for stock and mildly modified street vehicles. These included a change of damper style and flex plateflywheel changes. The flexplate has cracked twice in the past 6 months. Tci 399554 454 flexplate external balance speedway motors. The starter engages with the teeth to start the engine. If the flex plate didnt flex all that force would be transfered up the crank into the engine and the bearing would have a short and violent life. I can see little tiny dings on the flywheel teeth on the starter side of the flywheel. Drive damper flex plate for velvet drive borg warner 1004650007 as7k2c round drive damper assembly with purple springs for velvet drive 71, 72,1004, 1005, 10, 1014 series marine transmissions. Allstar performance all26800 168t sfi internal balance flexplate.

The rotating assembly with flexplate converter may be thrusting forward. Check out the deal on ats 3059003104 billet flexplate upgrade 9403 7. Most likely you will have to find a casting number on the block to know for sure. Patc sells billet flexplates, performance flexplates, stock flexplates for dodge, ford and gm. Can you replace chevy flexplate without removing tranny. Atp z166 automatic transmission flywheel flexplate product image. Ford 289460 v8 & chevy 90 v6 & 265454 v8 with 2pc rear seal. How do you tell the difference between a 396 and a 454 big. I took the trans dust cover and moved it the best i could because the exhaust pipe doesnt let it come off. I am the original owner of a 1992 c 1500 silverado 5. Transmission flex plate sinister diesel flex plate. Jun 19, 2007 what does a cracked flexplate sound like. Mrc magnum holden gen 3 flex pate flexplate ls1 vt vx vy.

We help you find the heavy duty truck parts that you need. Sfi approved billet flexplates from ats will hold up under the most extreme conditions. Buy scat crankshafts fp 454 sfi flexplate for big block chevrolet. Dec 26, 2009 is it possible to install a flywheel backwards by accident. Gm power enthusiasts like us were relieved to find that the gm gen iii engine released in 1997 had essentially the same block bolt pattern at the rear. Just take a look at highquality mirror glasses available on our digital shelves. Mar 26, 2017 like bill mentioned, there is a proper torque sequence to follow to tighten the flex plate to the crankshaft. After a couple of weeks it started making a noise and figured out it was a cracked flexplate. How to replace the flywheel in vehicles by contributing writer updated june 12, 2017. If you are breaking a new flex plate in a minimal amount of time, it is probably related to improper installation when bolting up the torque converter.

Vehicleengine search vehicleengine search makemodel search. A rear main seal leak can cause some big problems in your vehicle. Order at flexplate for your vehicle and pick it up in storemake your. Mine was cracked all the way around the center mounting holes shop the new one is. I have a loud knocking noise coming from the engine.

Well u also have to properly torque it to the crankshaft or they will crack had to redo one another shop did and they just took and impact to the bolts. Patc sells billet flexplates, performance flexplates, dodge ford. Oil pump primer tool gm chevy v6 v8 small big block. Replace your cracked or broken side view mirror glass at a fraction of dealer cost. There are tough flexplatesand there are chuck norriscaliber flexplates. To make things worse, replacing a rear main seal can be one of the most expensive jobs you can do on your car next to replacing the. The other task the flexplate must perform is joining the crankshaft to the torque converter. Add to engine lube makes high mileage cars like new with a synthetic material treats one regular car, truck, tractor or small diesel 3. Cracked flexplates will cause bad vibrations, break dowel pins and cause numerous amount of issues. Sep 16, 2008 well heres my question, this truck runs like a champ, ive always maintained everything in my garage that was in my boundarys of knowledge, oil changes,chassis lubed, brakes, the small stuff. Well i had a good friends tranny shop do my 3rd trans. I feel like my flexplate is going bad in some way havnt checked fully yet, what are all of the symtoms of a bad flexplate.