3 Speed All Synchromesh Gearbox

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Page created by T July 8th 2007:

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3 Speed Allsynchromesh Gearbox. Click to enlargen. Photo by Eldon

3 Speed All Synchromesh Gearbox:

These were fitted to Holdens from HK - HZ. Shift Pattern is as per the usual - Reverse is towards and Up, 1st towards and down, 2nd away and up, 3rd away and down. The 3 Speed All Synchomesh Gearbox uses one activation rod for (1st or Reverse) and the other for (2nd or 3rd). As a result, the matching Steering Column must be used.

Holden 3 Speed All Synchro Gearbox and Bell housing as used in HQ - WB. Click to Enlargen. Photo by Tim_202.

7 bolts hold the side cover on. 5 bolts hold the extension housing on. Eldon's Shed

Aussie Four Speed Manual Gearbox Bellhousing, Engine Side. Click to enlargen. Photo by fjwb.
Aussie Four Speed Manual Gearbox Bellhousing, Gearbox Side. Click to enlargen. Photo by fjwb.

Oil Capacity:

The 3 Speed All Synchromesh Gearbox holds 2.55 Lires of Oil.

Draining the Gearbox:

To drain the oil remove the rearmost and lowest cover bolt from the offside of the gearbox and catch the oil in a tin.

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.

Towing:

Improper Towing can burn up the Mainshaft because the Input shaft is stopped.  When the Input Shaft is stopped, no Oil is circulated through the Mainshaft 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 Input Shaft. 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.  

3 Speed Allsynchromesh Gearbox. Click to enlargen. Photo by Eldon
   
 
3 Speed Allsynchromesh Gearbox. Click to enlargen. Photo by Eldon
 
 
3 Speed Allsynchromesh Gearbox. Click to enlargen. Photo by Eldon
 
 
HK 3 speed Allsynchromesh Gearbox. Click to Enlargen. Photo by Dusty Dirt Roads.
 
3 Speed Allsynchromesh Gearbox viewed from above. The oil filler hole is on the underside of the image (the nearside of the gearbox). Click to enlargen. Photo by Eldon
 
 
3 Speed Allsynchromesh Gearbox with Aftermarket Floor Shift Mechanism. Click to enlargen. Photo by Jason
 
3 Speed Allsynchromesh Gearbox with Aftermarket Floor Shift Mechanism. Click to enlargen. Photo by Jason
 

 

3 Speed Allsynchromesh Gearbox with Aftermarket Floor Shift Mechanism. Click to enlargen. Photo by Jason
   
 
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.
 

 

 
3 Speed Allsynchromesh Gearbox. Click to enlargen. Photo by Peyser64.
 

 

 
3 Speed Allsynchromesh Gearbox. Front Selector Shaft seems to be leaking. Click to enlargen. Photo by Willid_14.
 

 

The Oil Filler Plug is circled. Click to enlargen. Photo by Jason.

 

Column Shift Selector Levers with Washer problems. Click to enlargen. Photo by Willid_14.

 

Column Shift Selector Rods. Click to enlargen. Photo by Willid_14.

 

HG with correctly installed Selector Levers . Click to enlargen, then click again to further Enlargen the Image . Photo by Paul Versteden.

 

3 Speed Allsynchromesh Gearbox Internals. Click to enlargen. Photo by Red Seat.

Output Shaft:

ALL TRIMATICS , AUSSIE 4 SPEED AND 3 SPEED all syncro have the same number and type of splines on the out put shaft only the early part syncro boxes had a course spline output shaft... v8 have a different size uni to sixes.. wombat.

The Nuts That Hold The Linkages To The Gearbox

By ben simpson 23/05/16@20:51 *new

11/32 unf same as a blue 6 or 253/308 standard (not A9L) rod nut

End of submussuon by Ben Simpson.

Links:

Ratios Thread 

HQSS' Shed

Eldon's Shed

Terms:

Terms

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