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Testarossa / 512TR


As our gallery at the bottom of the page highlights, shafts, gears and differentials were all weak points on these platforms.  Even at relatively low mileage, the lower-grade 16NiCr11 alloy used to make the original gears exhibits severe pitting.  Rather than replace an old, failure-prone component with a new, failure-prone component we offer the option of properly engineered replacements that won't fail - shafts designed to twist that won't snap, gears made of modern alloys and treated that won't break or pit and differential housings that won't crack and don't require reusing 30+ year old internals.


After commissioning a complete replacement of his 512TR's internals with our components, one 40-year Ferrari owner commented:  "I have never driven another Ferrari that manually shifts as well, is as quiet or as smooth... absolutely no excuse that a quarter million-dollar super car, that was also Ferrari's flag ship back in its day, should shift so poorly or have the history of gearbox problems the Testarossa and 512TR do.  Now mine doesn't and it's a joy to drive again."

Gearbox Solutions

Ring & Pinion

Propeller Shafts

Propeller Shafts

HCF's Ring & Pinion replacements are the finest quality available.  They are superior in every way to the original fitments parts - made of modern, high quality aerospace steel, cut by the superior Klingelnberg Palloid method of gear hobbing and isotropically finished.  Available in both 512TR and Testarossa ratios.  

(Ferrari P/N's 168969, 110016, 159069)

Propeller Shafts

Propeller Shafts

Propeller Shafts

The propeller shaft transmits engine power to the transaxle.  In response to many early failures, Ferrari made a stronger shaft which commonly broke the, now weaker, transmission main shaft.  The unique steel alloy of this improved shaft is designed to provide a high degree of torsional flex to insulate components like the main shaft from destructive shock loads.

(Ferrari P/N's 151651, 162909)

Main shafts / Gears

Limited Slip Differentials

Limited Slip Differentials

Main shaft and gears manufactured from a aerospace-derived steel alloy.  The combination of higher quality materials and processing techniques eliminates common issues with the OEM components - broken gears and snapped input shafts.   See gallery below for detail on failed OEM gears and shafts. 

(Ferrari P/N's 109716, 156925, 183964)

Limited Slip Differentials

Limited Slip Differentials

Limited Slip Differentials

Limited Slip Differentials feature a one-piece machined housing rather than the welded unit many came equipped with.  They have all new and improved-quality side gears, spider gears and positraction components.  See gallery below for detail on failed OEM limited slip differentials.

(Ferrari P/N's  106769, 101626, 147258, 190005, 199782, 183932, 238598, 103262, 146769, 148253, 155099)

Ring & Pinion in Process

Blanks rough milled, ready for teeth

Teeth cut, grinding tooth faces

Completed ring gear, ready for pattern test with pinion gear

Splines cut on pinion shaft

Completed pinion, awaiting isotropic finishing

Completed pinions, awaiting isotropic finishing

Pattern testing

Kevlar Composite Clutch Solution

Kevlar disc clutch assemblies and flywheels - in stock

Upgrading to HCF's Kelvar composite clutch assembly has two primary benefits over the OEM assembly.  First, there is a noticeable improvement in pedal effort that customers report makes the car more enjoyable to drive.  Secondly, the wear characteristics of this particular kevlar composite are 1/2 to 1/5 that of traditional OEM facings.  Lightweight flywheel available on request. 

Fits:  512TR, F512M, 456, 550, 575, 612 

Complete assembly with pressure plate

Pressure plates rebuilt and customized to work with kevlar material.  For proper results, the kevlar disc must be paired with one of our customized pressure plates.

Kevlar composite disc

Made in the USA of a patented textile kevlar composite material, these kevlar discs outperforms other kevlar facings in terms of disc wear, engagement, chatter and flywheel abrasiveness.

Kevlar Disc Real World Example

512TR / 550 Maranello Kevlar Composite Clutch Disc

Rebuilt OEM disc with segmented facings.  As installed during engine-out service in 2011. 

1 year later - disc condition

A little over a year later the gearbox was damaged and developed an oil leak, necessitating a tear down.  Clutch disc showed virtually no wear and, as this particular Kevlar fiber composite material is designed to work wet or dry, it did not need to be replaced due to oil contamination. 

6 years later - disc condition

In 2017 the gearbox main shaft broke, giving the opportunity to inspect the clutch components.  No more than 0.5mm of measured wear. 

Other Model-Specific Products

Berlinetta Boxer / Testarossa / 550 / Other

Ring & Pinion

Ferrari Part numbers:  110013, 110016, 159069, 168969

Fits:  512BB, 512BBi, Testarossa, 512TR and F512M  

Limited Slip Differential

Ferrari Part Numbers:  103262, 146769, 148253, 155099 

Fits:  365BB, 512BB, 512BBi, Testarossa, 512TR, and F512M 

Propeller Shaft

Ferrari Part Number:  151651

Fits:  512BB, 512BBi, Testarossa, 512TR and F512M 

Main Shaft

Ferrari Part Number:  109716 

Fits:  512BB, 512BBi, Testarossa, 512TR and F512M 

Replacement Gears

Ferrari Part Number:  136340, 140193, 140195, 148249, 136330, 136344, 140209, 106749, 107508, 107504, 106742, 107526, 107507, 105753, 119797, 105749, 107504, 105742, 119794, 107526, 110172, 119809

Fits:  365BB, 512BB, 512BBi, Testarossa, 512TR, and F512M 

OEM Synchros

Ferrari Part Numbers:  106040, 106048, 150628, 156842, 152209

Fits:   308 variants, 328, 348, 365, 400i, 412, 512BB, 512BBi, 512TR, F40, Mondial 8/QV/t, Testarossa 

Kevlar composite clutch disc and pressure plate

Ferrari Part Numbers:   194775, 194776,  135076, 135077, 135078, 136006, 124100, 124099, 135077, 124098, 124680, 109460 Fits: 512BB, 512BBi, Testarossa, 512TR, F512M, 456GT, 456M, 550 Maranello, 575M, 575M Superamerica, 612 Scaglietti  

Exchange service on OEM core for single disc and dual disc applications.  Improvements to pedal effort, disc wear and disc clamping force deliver a noticeable improvement over OEM. Kevlar composite disc is non-abrasive to opposing surfaces.

Complete Gearboxes

Ferrari Part Numbers:  184139, 186140, 210925, 210929, 204816, 204817, 210490, 210491, 185251


Complete gearbox assembly - as available

Damaged OEM Components / Replacements


    Disclaimer - all components are intended for off-road use and sold as-is, without any expressed or implied warranties of any kind.  

    Terms & Conditions can be found at the following link - Terms & Conditions.                
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