3 Speed Crash Gearbox
Page created by T Jul 17th 2007:
- 1 3 Speed Crash Gearbox:
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.
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.
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.
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.
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.