BU602 1957-1963 Buick 401/425 Nailhead (w/ 2.90" crank flange) to Chevy Automatic Transmission

Materials Included:

(1) Adapter Plate - Buick Nailhead to Chevy
(1) Crank Adapter-Inner
(1) Crank Adapter-Outer
(1) Torque Converter Drive Plate
(1) Flexplate - Small Center-Balanced Flexplate
(1) 166W Tooth Ring Gear
(1) Balance Weight - Buick-401/425 to Chevy Auto. Balanced FP
(6) SHCS 7/16-20 x 3
(4) SHCS 7/16-14 x 1-3/4
(2) SHCS 7/16-14 x 1-1/4
(6) 7/16-20 x 3/4 Flexplate Bolts
(2) Dowel Pin .621 x 1
(5) HCS 3/8-16 x 1-1/4 YZ8
(3) 7/16 H Extra Thick Washer
(3) 7/16 Flat Washer

Are you planning on using a modern GM 4L60E, 4L65E, and 4L70E (1997 and earlier only) or GM 4L80E and 4L85E transmission with this kit? By adding a US Shift Quick 4 stand-alone transmission controller you will save $100 dollars off of the cost of your Speed Gems adapter kit. This kit will not work with “LS” based transmissions.

Customers are responsible for throttle position signal provisions. Check out US Shifts options for TPS Kits. Please give us a call if you're not seeing what you need!

*Matching our adapter kits with your engine can be tricky. If you are unsure of which kit to purchase for your engine, please call customer service at (763) 767-4480. Speed Gems is not responsible for return shipping costs of mismatched kits.

Installation Instructions