How do you measure flexplate?
On your flexplate, measure from the center of one bolt hole to the center of the center hole and multiply by 2. That’s your bolt circle diameter. You can measure the BCD the same way on your converter (center of one hole to the center of the converter nose X2).
How do I know if my flexplate is loose?
Symptoms of a bad flex plate
- Clunking, grinding, chirping, or rattling noises from rear of engine when engine is idling.
- Knocking noise when engine is shifted into drive or reverse.
- Heavy vibrations felt through the driver’s seat when driving at normal speeds.
- Rough-running engine.
- Loss of power at higher speeds.
Do I need to shim my flexplate?
If there is a 1/4″ or more clearance between the converter and flexplate you need to shim it. Use washers that are the same thickness to get down to about 1/8″ clearance. You need some clearance for converter ballooning.
Should there be a gap between flexplate and torque converter?
general rule of thumb is 1/4″ max….. you can use washers to shim (same amount and size on each bolt); however then comes the problem that the bolts may become too short to be safely used.
How much space do you need between flexplate and converter?
You should observe 1/8” (. 125”) to 3/16” (. 187”) of air gap between the torque converter mounting pads and flexplate before sliding the converter forward to attach it to the flexplate. If you have 1/8” – 3/16” air gap then you may proceed with sliding the torque converter forward and attaching it to the flexplate.
What’s the correct bolt count for a flexplate?
The key to choosing the correct bolt pattern and tooth count is measuring the torque converter you are using. A 153 tooth flexplate will be paired with a torque converter that has a 10 3/4-inch bolt circle. A 168 tooth flexplate uses a 11 1/2-inch bolt circle.
How big is a torque converter on a flexplate?
A 153 tooth flexplate will be paired with a torque converter that has a 10 3/4-inch bolt circle. A 168 tooth flexplate uses a 11 1/2-inch bolt circle. Some aftermarket flexplates are drilled with both patterns to accept large and small diameter torque converters.
What to look for when buying a flexplate?
There are four main factors to consider when purchasing a flexplate. The crank style: One or two piece rear main seal. Older style blocks (’55-’85) used a two-piece seal, ’86 and up blocks used a one-piece seal. The torque converter bolt pattern: large 11 1/2-inch or small 10 3/4-inch. Ring gear tooth count: 153 or 168.
What kind of bolt pattern does a 168 tooth flexplate use?
A 168 tooth flexplate uses a 11 1/2-inch bolt circle. Some aftermarket flexplates are drilled with both patterns to accept large and small diameter torque converters. You can also note that a 153 tooth flexplate always uses the straight bolt pattern starter, and the 168 tooth flexplate uses a angle bolt pattern starter.