Shovel Clutch

 

You know the sad story. The torque on the clutch nut backs off a hair and the key on the transmission mainshaft shears off. This usually happens at the most inconvenient time and place. And the probability of this sad story playing out is greater with performance applications.

 

The splined Shovel clutch kit retrofits and upgrades the stock tapered mainshaft and clutch to a modern 18 tooth spline configuration. Kit includes a fully assembled clutch and splined 4-speed mainshaft to retrofit stock 1970-E84 Big Twins.

 

- 9 Kevlar 2-sided clutch plates with large mean radius.
- Billet 6061-T6 blasted clutch carrier
- Hard anodized pressure plate
- Raw Blasted clutch carrier
- BAKER’S exclusive1-piece clutch basket and 66 tooth ring gear design.
- Larger torque capacity.
- Diaphragm-type pressure plate spring with ergonomic break-over feel during disengagement.
- 2 Year limited warranty

Clutch Features

 

Stock Clutch Layout with Splined Mainshaft Fix

Stock Clutches
Shovelhead clutches from the 70′s were prone to have several issues.  Two of the leading issues were the sticky / jerky clutch release from a stop light, in which you would never know if it was going to happen, the other was a the starter ring gear.  The ring gear design on the stock clutches was a 3-piece riveted together then welded to the basket.  Over time the ring gear would wear and become skewed cause starting issues.  The image on the left shows the stock clutch in pieces along with our Splined Shaft at the bottom.

 

 

 

Clutch Sprockets

Shovel Clutch Design
The clutch is based off of our 9-plate clutch used on 1990-up applications and fits in the stock primary housing and TTP. We offer 35, 36, 37, and 38 tooth clutch sprockets with our clutches to dial in your overall gear ratio.

 

The fundamental design approach of the BAKER clutches is different than anything available from the factory or other aftermarket manufacturers. For strength reasons, we manufacture our clutch with a 1-piece ring gear/basket. First, a large donut shaped forging is turned on a CNC lathe to the shape of the finished basket. Next the internal splines for the friction plates are formed with a 6-foot long broach. Threads for attachment of the carrier are machined on a mill, then the ring gear teeth are hobbed on the same type of machine that makes our gears. It is not cheap to make the heart and soul of our clutches in this manner but the end result justifies the expense. The radial strength gained by integrally putting the ring gear around the basket is analogous to the steel bands placed around a whiskey barrel. Without the steel bands, the barrel would explode and that would be alcohol abuse. Additionally, the ring gear is supported by the hoop of the basket and this guarantees the T.I.R. at the pitch line of the ring gear teeth (no egg shaped ring gear).

 

Splined Shovel Clutch Baskets

Kick or Electric
You have the option of having the Shovel Clutch as a Kick Only application or as a stock replacement with starter ring gear for electric start applications. Both styles can be ran wet or in a dry application, note the differences in clutch basket design.

 

Requirements
Clutch is to be used in conjunction with a splined mainshaft; 1970-early 1984 models. BAKER offers the splined mainshaft for your stock 4-Speed for a complete retrofit conversion.

 

Recommended
BAKER highly recommends when replacing/converting your stock 4-Speed to a splined shaft that you completely rebuild the transmission replacing any worn out items or components.

 

BAKER DRIVETRAIN DOES NOT SUPPLY THE SNAP RINGS, BEARINGS OR RELATED COMPONENTS FOR THE MAINSHAFT INSTALLATION. PLEASE REFER TO THE FACTORY SERVICE MANUAL AND AFTERMARKET PARTS CATALOG FOR THESE ITEMS. DO NOT REUSE YOUR OLD MAINSHAFT SNAP RINGS OR BEARINGS AFTER DISASSEMBLY AS THIS MIGHT CAUSE FAILURE TO COMPONENTS.

 

PN Description Fitment
9P400* Splined Shovel Clutch Assembly 1970-E84 Shovelheads
9P401* Splined Shovel Clutch w/Splined Mainshaft 1970-E84 Shovelheads
MS-4-SPLINE 18 Tooth Splined Mainshaft 1970-E84 Shovelheads

 

Notes
- *= Specify clutch sprocket by adding a “-35″, “-36″, “-37″ or “-38″ to the part number.
- Specify a “-K” for kick only or “-S” for starter version after the part number; example: 9P400-37-S

 

Recommended Upgrades
- The TTP, ‘Tin Type Primary’
- The BAKER 4-Speed, can come with splined shaft installed.

 

Click on any of the images below to learn more

Tin Type Primary

BAKER 4-Speed

 

Instructions
Splined Shovel Clutch Instructions: Click Here

 

Product

Splined Shovel Clutch 9P400-37-S

Splined Mainshaft MS-4-SPLINE

Splined Shovel Clutch Kit 9P401-37-S

 

 

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