Patc sells billet flexplates, performance flexplates, dodge ford. Flexplate technology and choosing the flexplate for you. When it was bolted up tight to the flex plate it would put the converter slightly off center. These nonsfi rated small block chevy flexplates are suggested whenever installing a new engine or transmission.
How the engine receives torque depends on the transmission and the accompanying flywheel or flexplate within it. This covers most small block chevrolets and mild big blocks. Buy prw 1835001 sfirated internal balance 168 teeth chromoly steel flexplate for chevy 195785, 90 early, v6, gold irridate. Have you wondered the difference between a flexplate vs. I was just wondering how many of you out there with the 4. The key to choosing the correct bolt pattern and tooth count is measuring the torque converter you are using. Difference between flywheel and flexplate by jacob stutsman. Free shipping on many items browse your favorite brands.
Got a 70s sbc 700r4 that someone else put together with a vibration above 3,000 rpm. Ati sfi flexplates for racing automatic transmissions. The tci superquality flexplates are thicker than stock plates to withstand the stresses of todays high rpm engines and highstall torque converters. The teeth around the edges can also break off, causing. Starting the ignition allows electrical energy to be converted into the mechanical energy of an engine. This 153tooth flexplate fits 198697 externally balanced sb chevys such as 4. Theres also a chance they didnt gradually torque the bolts that hold the flex plate to the torque converter and maybe its not balanced. All 396, 402, and 427ci engines are internally balanced and all 454ci and larger engines are externally balanced. Slight misalignment may only cause a single flexplate to break in the life of the vehicle. The rotating assembly with flexplateconverter may be thrusting forward. May 18, 2012 have you wondered the difference between a flexplate vs. Top rated products in automotive replacement flexplates. Difference between flywheel and flexplate it still runs.
I just thought id post a short video of what a cracked flexplate on a 6. Mine was cracked all the way around the center mounting holes shop the new one is like. Performance automatic is now considered to have the most complete ford automatic flexplate line in the country. Whatever transmission is used, the flywheel must be for a 454 of the same year as the engine you are using, to eliminate vibration. Bought a hot rod a few years ago that was mostly built and used it as my daily for a while.
Usual failure mode is the crankcase bolts or the torque converter bolts work loose, allowing the parts to start moving in different directions, the clicking sound you heard. Similar in function to a flywheel in manual transmission engines and called a flexplate due to its expansion, or flexing, during the. The flex plate replaces the flywheel in automatic transmission cars. A flexplate connects an automatic transmissions torque. There are a crapload of different flexplates for the 454 since it came with th350th4004l80etc. Took it all apart, turns out some knuckle head had a pilot bushing in the crank. Buy your performance automatic 157 tooth automatic transmission flexplate with a 50 oz. A flexplate connects an automatic transmissions torque converter to an engines crankshaft. A cracked flex plate is almost always a sign of other problems. Torque converter seemed to index into the back of the crank ok. This 153tooth flexplate fits 198697 externally balanced sb chevys such as. Installation instructions th700r4 4l60 transmission. The engineer put a triangular file on it and had no trouble marking the plate, he said it is just plain old mild steel, and welding would be no troubles.
Will a 700r4 tranny blt up behind a 454 in place of a 400. The other task the flexplate must perform is joining the crankshaft to the torque converter. Ati flexplates and adapter kits for street and race use. Like loss of power, this symptom could be caused by many factors other than a cracked flexplate. It is sfi certified, has extra welds and will accept any factory or aftermarket torque converter. Upshift and it goes away until that rpm is reached again.
Like bill mentioned, there is a proper torque sequence to follow to tighten the flex plate to the crankshaft. Buy scat crankshafts fp 454 sfi flexplate for big block chevrolet. Performance automatic pax30215 flexplate 157 tooth 50 oz. The flexplate can crack or warp due to an out of balance engine or torque converter. 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. Wastegate buy ict billet prw ls flexplate wbolts ls1 th400 th350 700r4 swap flywheel sfi 10. Broken or loose bolts on the crankshaft end of the flexplate, or on the torque converter side, missalign the flexplate, causing a high side of the plate to strike or.
A 153 tooth flexplate will be paired with a torque converter that has a 10 34inch bolt circle. Then whom ever replaced the fp before me didnt catch the peened bellhousing and tightened it down causing a alignment problem. Balance for 19651973 302 mustangs with a c4 automatic transmission from cj pony parts. The same things that cause the flexplate to crack can also cause transmission problems. Will a turbo 700r4 live behind a 454 big block 093005 09. A modern enough 454 will not produce enough power to break a wellbuilt stock 700r4 they have been used with little trouble in corvettes with stronger engines so you dont need to worry about overpowering them. Ati flexplates are created from custom drawn sfispec chromoloy steel and are sfi certified. Some aftermarket flexplates are drilled with both patterns to accept large and small. Its a 58 ford f100 with camaro clip and 427 chevy motor 75 ish 454 truck block.
Scat crankshafts fp454sfi flexplate for big block chevrolet. I can answer that question, i have a 4l80e from a 1994 suburban with a 454, and the six bolt flexplate from a 1979 suburban two piece rear main seal engine lines up with the holes in the. Has anybody had any luck welding up cracks in a 6 cyl flex plate. Both were cracked broken cases with next to no mileage on them. Oct 29, 2006 700r4 torque converter spacing to flex plate i just installed a 700r4 to a 350 chevy, with the torque converter in place, pushed as far back on the shaft as it would go there was a gap between the torque converter and the flex plate, about 12 inch. The problem turned out to be a cracked flex plate which. The flexplate has cracked twice in the past 6 months. The first indication was the it was hitting the starter teeth. The 2001 toyota rav4 has 1 problems reported for cracked flex platetorque converter.
Broken center of flexplate or what some people may call a flywheel on a 99 chevy hd pickup with 4l80e automatic transmssion. How to know if a flexplate is warped it still runs. Flexplate, superplate, 168tooth, steel, internal engine balance, 2piece rear main seal, sfi 29. Patc sells billet flexplates, performance flexplates. Buy scat crankshafts fp454sfi flexplate for big block chevrolet. Putting fun and friendliness, first into owning and learning about amc small bodied cars, primarily eagles, spirits and concords as well as vehicles built in amcs mexican subsidiary, vam. Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. More severe misalignment can break a flexplate in 15,000 to 30,000 miles. Technical chevy torque converter flex plate crank vibration. Mar 26, 2017 like bill mentioned, there is a proper torque sequence to follow to tighten the flex plate to the crankshaft. Vehicleengine search vehicleengine search makemodel search.
A 168 tooth flexplate uses a 11 12inch bolt circle. If you really stop and think about a highhorsepower pro modified car planting the tires and launching to a subone second 60foot times, realizing there is a small, relatively thin plate of metal transferring 4,000 horsepower rearward at one of the key junctions in the powertrain, you begin to see the. Check the flexplate for cracks and chipped teeth on the ring gear. This flexplate is 164 teeth and is set up for the 8 bolt crank, pa26469, is the one you need. Flywheels and flexplates mark iv bigblock flywheels and flexplates are pretty easy to recognize. Early 90s pickups came with a 454 and 700r4, so i imagine a flex plate from one of those would be the ticket the early 90s truck with 454 s came with a thm3l80400 3 speed auto, then in 1991 all 454 s came with the 4l80e trans. Flywheels and flexplates are two parts that help accomplish the same task in an. If you really stop and think about a highhorsepower pro modified car planting the. 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. Hand turning it over i found that the new flex plate is not running true. When replacing a flex plate big block chevy does the flex plate need to be balanced to the engine. Flexplate, 168tooth, internal engine balance, 1piece rear main seal, sfi 29. Patc sells billet flexplates, performance flexplates, stock flexplates for dodge, ford and gm. Whether youre racing or building a street vehicle speedway motors.
I put in a new flexplate stock 400 couldnt snag an sfi quick. From what the po told me, the motor is a 350 from a 72 monte carlo. Being an auto, it will be fluid balanced by the torque convertor, so babancing it wont be an issue. A couple of weeks ago i started to get a clicking sound that would speed up slow down with engine speed, but i just assumed was the exhaust.
Nov 23, 2015 the other task the flexplate must perform is joining the crankshaft to the torque converter. Disconnected converter from flex plate, smooth as a whistle. External 168 teeth balance chromoly steel flexplate for chevy 454 197090, early. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the. The first cracked fp for me i ignorantly assumed the missing torque converter bolt was the problem so i missed the bellhousing problem. And like gearcruncher said, the flex plate does have a spacershim and maybe they didnt install it. Nov 20, 2009 i havent had the time to see if it fits my 350350 combo in my 53 chevyif it does and is for a th350 than im not going to be bummed, i can use it. When replacing a flex plate big block chevy does the. And like gearcruncher said, the flex plate does have a spacershim and.