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Racetorations have over 20 years of development in modifying the TR gearbox. Our
gearboxes are used worldwide. They are reliable and extremely strong. The top of
the range boxes use specially made layshafts hardened to approximately twice the
standard depth. The lay gear modifications use high speed bearings that halves the
point load on the layshaft. The laygear thrust both forward and reverse are converted
to a multi- bearing flat roller surface. Synchro rings are competition type hand
toleranced into each unit. Quickshaft top covers and co-axial release bearing kits
are regularly fitted. The boxes have been used in TR Register championship winning
TR4s and TR6s as well as in our 230 BHP Talisman TR6 and many other TRs built to
circa 200 BHP+.
Racing Dog Box. Bullet proof race box with option for overdrive mainshaft and high
or low first gear. Uses original TR casing with some small modifications. Not suitable
for road use as it is noisy and doesn't really need synchro. Comes as a complete
gear kit including bearings, shims and a gearbox gasket set. A £250 surcharge will
apply if no suitable gearbox casing is supplied. Gear set shown in additional pictures.
Hydraulic Release Bearing kit. Easier and smoother clutch. No slave cylinder and
associated linkages to adjust. Self adjusting. comes with all hoses, brackets, bleed
facility, release bearing and 0.625 master cylinder.
(GER301) To supply larger diameter case hardened layshaft.
(GER301) In addition to GER301A above, modify laygear cluster and supply and fit
three caged bearings.
GT6 Gearbox Modifications. Laygear. To improve the longevity of the GT6 gearbox used
in conjunction with modified straight six engines we have increased the diameter
of the layshaft and case hardened it to 0.030”+. In addition we have doubled the
bearing load surface at the high end of the laygear cluster. This has been done with
caged roller bearings, 3 in total. We require your own gearbox and laygear cluster
to carry out the modification and we will return it with the correct endfloat. Components
are available separately as below to carry out your own modification.
Modified All Steel Gearbox. A or J. £250.00 surcharge if a late steel TR6 gearbox
can not supplied for us to modify.
Stag Type A or J Roller Bearing Gearbox. Can be made from late TR6 gearbox. These
gearboxes have all the top range modifications of the all steel modified gearbox
specification but in addition are fitted with roller bearing thrust at each end of
the laygear (countershaft). This allows closer tolerances and reduces friction and
improves reliability in fast road or track use. £250.00 surcharge if a late steel
TR6 gearbox can not supplied for us to modify.
A Type Overdrive. Fully re-built and bench tested. Uprated road or competition. Old
unit surcharge £300.00
Stag Hydraulic Release Bearing kit. Specially developed in conjunction with Faversham
Classics to overcome all shortcomings on the original slave cylinder type systems.
J Type Overdrive. Fully re-built and bench tested. Uprated road or competition. Old
unit surcharge £150.00