Grey Motor Trimatic
Page created by Mar 13th 2009:
Grey Motor Trimatic:
Description:An Hydramatic Gearbox can be replaced by a Trimatic on both Grey and Red 6 Motors.
Info by HBTorry:
Howdy Early Holden fans ! For your consideration is a Trimatic fitting kit that I developed for my own EK about 10 years ago. This kit allows a Trimatic auto to bolt up to a Grey 6 and utilises the original rear side engine mounts. It is primarily designed to use when replacing the Hydramatic in an EK or EJ , but can be used to fit a trimatic in any early Holden with a Grey motor. Note that 48 - FB and EK/EJ manual bodies require floor tunnel modifications to fit the larger Trimatic transmission.As most of you will be aware , parts for the old Hydramatics are getting scarce and expensive , and at best they are only "just" a transmission. By fitting an efficient Trimatic you will gain a noticeable improvement in performance , driveability and fuel economy over the Hydramatic. As a benefit for those with a hot Grey , fitting a Trimatic will also allow the installation of a higher stall torque convertor which is not possible with the Hydramatic. This is the reason I developed this kit in the first place - I found it hard to get my Grey to idle in drive with a 45°/82° cam , twin 2 barrel Hitachis and a Hydra !All components in the picture are new with the exception of the flex plate , which is a good used unit modified to accept the Grey Motor crank flange. This is the "basic" kit and comprises only the parts depicted ( High tensile bolts/nuts , laser cut mounting plate , custom spiggot bush grey to trimatic , laser cut vinyl lettering for shift quadrant , flexplate to crankshaft bolts , trans shift lever and shift rod , etc )- which are all the unique parts required to do this conversion. All the other parts required are readily sourced as they are all either standard Holden or readily sourced aftermarket parts. This kit should be fitted by someone with sound mechanical knowledge and a reasonably well equipped workshop.As stated above , this kit bolts up to the original rear side engine mounts . When replacing a Hydramatic in an EK or EJ , there are no permenant modifications required for the body in an EK and only a small clearance proceedure in an EJ - it is a genuine "bolt-in" kit and the car can be returned to stock at any time. The mounting plate shown at the bottom of the picture is made of 5mm plate steel and is laser cut to my own design and gold zinc plated. This will mount the engine and transmission assembly in exactly the factory stock location and angle . This kit is designed to be very "factory stock" looking , and most people will find it difficult to pick as being modified !With the aid of this kit , you should be able to install a fully rebuilt Trimatic in your EK/EJ for around half the cost of getting your Hydramatic rebuilt - that is if you can find a transmission place who will do a Hydra ! You will also gain the benefits of a sharp-shifting , efficient , modern auto transmission that can be serviced or rebuilt by any transmission place at reasonable cost !!End of submission by HBTorry.
Kit Contact:Roger.mob: 0408 349 185 Email: firstname.lastname@example.org
Make sure that the original Dipstick Tube is kept with the Trimatic. While they look similar the wrong type will develop an incurable Oil Leak where the Dipstick enters the Trimatic until the correct Dipstick Tube is used. The Dipstick Tube *must* enter the Gearbox at 90 degrees. Using the wrong one will cause the Dipstick Tube to enter at the wrong angle. Keep any Bolts that came with the Trimatic. The boss lengths change resulting in longer or shorter Bolts being needed.
Make sure you get the matching Bolts for the Bellhousing you are going to use. Early Trimatics used short Bolts that are not long enough to travel far enough through the Bellhousing. Spaceage Bellhousings use long Bolts. These Bolts will bottom out without tighteneing the Bellhousing if used with early Trimatic Bellhoiusing.
Any Column Shift Trimatic WB or even some Column Shift Trimatic UC Toranas have the ideal Gearbox for the Conversion, since they use the Full Bellhousing (Spaceage) and have the Selector Lever on the offside.Alternatively, use any 6 Cylinder Commodore Trimatic Bellhousing (non-EST) and fit it to a R/H shift (Kingswood) box. All Commodore Trimatics were Electric Kickdown when sold new.EST VK Commodore Bellhousings were half height and had an Hole drilled in them to mount the Crank Angle Sensor.Trimatic Types