Mark Williams Lenco 1350 Series 32 Spline Transmission Slip Yoke (PN: 39013)Mark Williams Extreme Duty transmission slip yokes are machined from high strength 4340 steel and thru hardened in house for ultimate strength. All machining is done in relationship to the spline pitch diameter to ensure each yoke is symmetrical for balance and smooth operation. Applications Lenco transmissions Features Machined from 4340 high strength steel Thru hardened for ultimate strength Machined in relationship to spline for perfect balance and

Optimized runner geometry and plenum design for improved airflow and throttle response

✅ New for 2025:

Maintain a minimum clearance around the driveshaft tunnel

**Rear pinion flange will need to be removed and included pinion yoke will need to be installed

Care must be taken not to mix u-joint caps and maintain indexing after shaft is balanced

Please send us a note on how many ft/lbs of torque your car is capable of so we can test properly

Shot peened for added strength

25” 1350 Series Carbon Fiber Slip Shaft with upgraded performance U-Joints and hardware

We will always communicate any changes and offer the option to either proceed with equivalent premium components or wait for the listed parts to become available

CNC Machined

We build each driveshaft with aluminum adapter flanges from Composite Driveline and/or SONNAX

Nascar style transmissions