3 Speed Crash Gearbox

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Page created by T Jul 17th 2007:

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3 Speed Crash Gearbox in its original Form in this case an EK Holden. Click to Enlargen. Photo by Koutara.

3 Speed Crash Gearbox:

This gearbox was fitted to Holdens in one of 3 forms from FX - HK. It had a crash type 1st Gear but Synchromesh on 2nd and 3rd Gears. It also had a Reverse Gear.

Gearbox Forms:

1. The original 3 Speed Crash Gearbox had integrated Gearbox and Bellhousing and was fitted to FX - EK.

2. The 2nd form was installed in EJ's. This used a separate Bellhousing and was fastened to the Bellhousing by 4 Bolts. The EJ Bellhousing had 3 Holes on each side to provide for the Grey Motor Rear Engine Mounts and was EJ was the only Holden sold with this combination. Early 149 powered EH's used this Gearbox but bolted it to a Red Motor Bellhousing.

3. The last form also used a separate Bellhousing but was secured to the Bellhousing by 5 Bolts. These Belhousings had no Holes for attaching to Grey Motor Rear Engine Mounts.

 
Holden EJ Gearbox with 2 speed synchro and crash 1st gear. EJ's used the 4 Bolt Bellhousing. Click to Enlargen. Photo by Ishjana Elsher.
 
3 Speed Crash Gearbox with Aftermarket Shifter. Click to Enlargen. Photo by Grazza.

 
3 Speed Crash Gearbox fitted to EJ Bellhousing. This was the first type to use a separate Bellhousing, has the 4 Bolt Mating Face and support for Grey Motor Engine Mounts. There is no provision for a Rear Gearbox Mount. Click to Enlargen. Photo by Stock-EJ.
 
The Bellhousing used with 3 Speed Crash Gearboxes in EJ's. Note the 4 Bolts (2 top, 1 right side, 1 bottom). The Unit also has provision for Grey Motor Rear Engine Mounts (3 Holes left and 3 Holes right side).  Click to Enlargen. Photo by Stock-EJ.
 
3 Speed Crash Gearbox as it appeared in late EH - HK. Note there are no Extensions for the Grey Motor Mounts.  Click to Enlargen. Photo by Dougies EH.

   

 
3 Speed Crash Gearbox as it appeared in EH - HK. There is provision for a Rear Gearbox Mount. Click to Enlargen. Photo by Dougies EH.
 

 

    The "Three on the Tree" column shift used with this gearbox operated differently from the later 3 Speed All Synchro Gearbox fitted from HK on. The 3 Speed Crashbox has 2 pullrods. 1 pullrod actually moves the gears, the other determines which gears will be moved.

EJ Manual Gearbox:

This was the first Gearbox to use a separate Bellhousing and also have Synchromesh on 2nd and 3rd Gears.  It had a Crash 1st Gear. It used 4 Bolts to fasten it to the Bellhousing. The Bolt Pattern between the Bellhousing and Engine remained the same and continued through to VK Six Cylinder Engines. Being coupled to a Grey Engine, the Rear Engine Mounts supported the Gearbox and there was no Rear Gearbox Mount. 

Early EH Manual Gearboxes:

These used 4 Bolts to connect them to the Bellhousing. These were interchangeable with EJ Manuals and were fitted to 149 powered EH's.

Submission by Johnperth  01/01/14@15:33

T I was just looking at the 'paedia and would make a comment on the gearboxes for the early eh.
The first eh 179s were not available in manual because the boxes could not handle the power. it was not until some time later a manual box was available.
the 149 manuals gave a lot of trouble early in the piece because they were basically just a EJ grey motor box.
the fix was what Holden called the 'taxi pack' and my 62 eh had to have one fitted, it was basically as I understand it a stronger layshaft and bearings.
mine was one of the first ehs sold in WA and was sold to Elders for the country reps to use.
I bought it off about the third owner.
I assume elders bought a bunch of them.

johnperth

EH and Later Manual Gearboxes:

The 4 Bolt Manual Gearbox was replaced by 5 Bolt version. The addition of a single Rear Gearbox Mount is a factor in these EH - HK Gearboxes. The Bolt Pattern between the Bellhousing and Engine remained the same and continued through to VK Six Cylinder Engines. This Gearbox was used in EH, HD, HR and HK Holdens. These Gearboxes cannot be Bolted to EJ's because the 5 Bolt Holes form a mismatched Pattern.

The early EJ box used the same cluster , slide reverse idlerand syncro drum but the rear shaft and front shaft were different
later ej they changed the lay shaft to a larger size
in the EJ workshop manual it gives the engine number that they made the changes at

End of Submission.

3 Speed All Synchromesh Gearbox:

The later 3 Speed All Synchromesh Gearbox also has 2 pullrods, but 1 pullrod selects 1st and Reverse while the other selects 2nd and 3rd. Any conversion needs the Steering Column to be changed to match the Gearbox. 3 Speed All Synchromesh Gearbox

Draining the Gearbox:

To drain the oil remove the lowest extension housing bolt on the offside of the gearbox and catch the oil in a tin. On FX - EK the drain bolt is in the centre of the cover on the bottom of the gearbox. 

Filling the Gearbox:

When filling the gearbox make sure the drain bolt has been fitted and tightened down. Remove the large filler bolt in the nearside of the gearbox and place a tin under the hole. Pour in oil using an external funnel and a length of hose until the oil begins to run back out the filler hole and into the tin. When the oil stops draining out, install the filler plug and tighten it down. On FX - EK the filler plug is on the offside of the gearbox between the clutch throwout lever and the gear selector levers. The 3 speed Gearbox has synchromesh on 2nd and 3rd (top) gears only.  Note that this gearbox uses one activation rod to shift the gears and the other to select whether (1st or Reverse) or (2nd or 3rd) gears are shifted. 9 bolts hold the side cover on.

Towing:

Improper Towing can burn up the Mainshaft because the Layshaft gears are stopped.  When the Layshaft Gears are stopped, no Oil is circulated through the Gearset and damage will result. Towing the Vehicle with the Rear of the Car raised avoids this problem.

Coasting in Neutral:

When Coasting in Neutral there is a big difference in Speed between the Mainshaft and Layshaft Gears. This does not occur when the Gearbox is in Gear. Coasting in Neutral results in a lack of Lubrication to the Mainshaft and damage will result.  

 
An early Holden Gearbox with 2 speed synchro and crash 1st gear. Click to Enlargen. Photo by Grazza.
 
A Grey 138 cu in Holden Six Cylinder Engine coupled to original gearbox with 2 speed synchro and crash 1st gear. Click to Enlargen. Photo by Stock EJ.
 
Holden Red 161 six (as the sign says) with 3 Speed Crash Gearbox fitted. Click to Enlargen. Photo by Qute.
 
Early 3 Speed Crash Gearbox from EK. The Oil Filler Plug is between the Gear Selector and the Clutch Release lever in the centre left of the image. Click to Enlargen. Photo by Koutara.
 
Early 3 Speed Crash Gearbox from EK. This type of gearbox was fitted from FX - EK. Click to Enlargen. Photo by Koutara.
 
This 3 Speed Crash Gearbox is unique to EJ because of the Mount Points at the front of the Bellhousing and the Bolts that connect the Bellhousing to the Gearbox. Click to Enlargen. Photo by Stock-EJ.
 
Later style 3 Speed Crash Gearbox. This type uses a separate Bellhousing. This type of gearbox was fitted from EJ - HK but came in 2 forms. 4 Bolt attachment (EJ and early EH), 5 Bolt attachment (late EH, HD, HR - HK). Click to Enlargen. Photo by Qute.
 
Later style 3 Speed Crash Gearbox. This type uses a separate Bellhousing. Click to Enlargen. Photo by Qute.
First Gear is Selected. Click to Enlargen. Photo by Qute.

 
Late EH  Bellhousing. Click to Enlargen. Photo by 66HRUte.
 
Late EH  Bellhousing. Click to Enlargen. Photo by 66HRUte.
 
Late EH  Bellhousing. Click to Enlargen. Photo by 66HRUte.
 
Late EH  Clutch and Bellhousing. Click to Enlargen. Photo by HRAmbo.
 
Late EH  Bellhousing. Click to Enlargen. Photo by 66HRUte.
 
5 Bolt 3 Speed Crash Bellhousing. Click to Enlargen. Photo by 66HRUte.
 
3 Speed Crash  Box. The blue discolourisation may have been caused by Towing with the Rear Wheels on the Ground. Under this condition the Mainshaft rotates but the Layshaft doesn't. Photo by Stock EJ. Click to Enlargen.

 
5 Bolt 3 Speed Crash Bellhousing. Click to Enlargen. Photo by 66HRUte.
 
3 Speed Crash  Box. The blue discolourisation may have been caused by Towing with the Rear Wheels on the Ground. Under this condition the Mainshaft rotates but the Layshaft doesn't. Photo by Stock EJ. Click to Enlargen.
 
EJ Manual Gearbox Mounts. Photo by 1963EJ. Click to Enlargen.

 
The circled Bolt identifies this as being a late EH  Clutch and Bellhousing. Click to Enlargen. Photo by HRAmbo.
 
The circle shows the bolt hole that was moved externally on the late EH  Gearbox. Click to Enlargen. Photo by HRAmbo.
The circled Bolt identifies a 5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. On 4 Bolt models the Bolt Head is visible only from inside the Bellhousing. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.
 
5 Bolt 3 Speed Crash Gearbox from late EH and later Holdens. Photo by HRAmbo. Click to Enlargen.

 


3 Speed Crash Gearbox from late EH and later Holdens. Photo by Dirdsme. Click to Enlargen.</td>

Links:

Noisey in 1st Under Load

Stock-EJ's Shed has 3 Speed Crash Box images.

Ishjana's Shed

Doug McGregor's Shed

EJ and EH Crashbox Differences

Interchangeable Parts

Gearbox Noise Thread

Terms:

Terms

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