Description
Comparison points and tradeoffs
When comparing Torque Converter/FlexPlate Bolt (Screw), fits GM TH350 TH400#3987930 (3/8′-16 x 0.570) TH-350/400 with other Torque Converters options, use this source-backed detail as the primary discriminator: Category: Replacement Parts / Transmission & Drive Train / Torque Converters.
Use this second fact to evaluate the tradeoff: Fits the following Turbo Hydramatic (THM) Transmission Torque Converter Applications: General Motors TH350 Buick, Oldsmobile, Pontiac (Includes TH300) General Motors TH400 3L80, Allison AT540, 310mm Allison AT540, 310mm, TH-400 (TH400, THM-400, THM400) 3L80/3L80HD 1973-82 Corvette, Camaro & Nova Chevelle. 3L80, 3L80HD, 3L8O, 3L8OHD. Flexplate / Flywheel. A third point to compare across alternatives is: Made in the USA from heavy-duty, heat-treated alloy steel.
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
Perfect for High-Performance, racing, Heavy-Duty and Regular-Duty applications
Source product highlights
About this item
- Industry Part ID: 3987930, B-64, B64, 35996
- Made in the USA from heavy-duty, heat-treated alloy steel
- Includes 3 bolts. These bolt kits are the strongest bolts you can get to attach your torque converter and are used in competitions. The bolts are fully heat treated prior to thread rolling and machining.
- Dimensions: 3/8″-16, Length: 0.570″
- Fits the following Turbo Hydramatic (THM) Transmission Torque Converter Applications: General Motors TH350 Buick, Oldsmobile, Pontiac (Includes TH300) General Motors TH400 3L80, Allison AT540, 310mm Allison AT540, 310mm, TH-400 (TH400, THM-400, THM400) 3L80/3L80HD 1973-82 Corvette, Camaro & Nova Chevelle. 3L80, 3L80HD, 3L8O, 3L8OHD. Flexplate / Flywheel
sneaky –
good
james –
Great fit
Ralph Longfellow –
There bolts . Not much to say
Connie-C –
If you own a GM 350cc /AT – you need to know exactly the year of your engine (and flywheel flex plate). Late 80’s early 90’s they switched over to metric – Torque converter bolts come in both American and Metric. Worse yet, sizes are so close, the metric ones will screw-into the American sized flex plate leading you to believe it is the metric bold is the correct bold – WRONG ASSUMPTION. What will happen, you will tighten the bolt down and it will work loose.Moral of the story – make sure you do your homework and assess the exact year of your engine and flex plate – ALSO, DON’T FORGET TO APPLY LOCK TIGHT SEALANT TO THE THREADS.
Ryan –
Worked well for summit tc for th350.