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Hr31 Passage Auto To Manual Conversotion

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HR31-PASSAGE Veteran

HR31-PASSAGE

Posted
Posted

hey guys i'm looking a doing a auto to manual Conversion on my hr31 passage 1988 model.

i already have the complete engine & gear box in mind.

but what else do i need?

& what other parts can i use from the auto on the manual box etc?

as in can i use the auto tail shaft or will i need a custom built one?

also can i use the auto cross member?

& anything else i have missed

cheers guys :)

Birds Grand Master

Birds

Posted
Posted

Here's a "short" list.

Gearbox

Tailshaft (can shorten or lengthen existing)

Clutch kit

Clutch cable

Clutch fork

Flywheel

Pedal box

Shifter

Speedo sender

Crossmember

Spigot

ECU/wiring

Bellhousing

Various nuts and bolts

HR31-PASSAGE Veteran

HR31-PASSAGE

Posted
  • Author
Posted
Here's a "short" list.

Gearbox

Tailshaft (can shorten or lengthen existing)

Clutch kit

Clutch cable

Clutch fork

Flywheel

Pedal box

Shifter

Speedo sender

Crossmember

Spigot

ECU/wiring

Bellhousing

Various nuts and bolts

can i reuse any of these items from the auto?>>>

Tailshaft (can shorten or lengthen existing) <> would it have to be shorten or lengthen at all?

ECU/wiring <> i got a manual ecu but will it require different wiring or could i use the same off the auto?

Speedo sender <> could i use the same from the auto?

Crossmember <> can i use the auto one?

already got these items>>>

Spigot

Clutch fork

Gearbox

Clutch kit

Flywheel

Pedal box

Shifter

Bellhousing

Various nuts and bolts

Clutch cable <> getting one soon

Birds Grand Master

Birds

Posted
Posted

Not sure about interchangeable parts from auto to manual, as I'm not that familiar with the HR31, but I deal with people everyday wanting to convert their Commodores from auto to manual and the list I've given you is basically what needs to be done. I wouldn't expect the manual and auto gearboxes to be the same length (therefore different tailshaft) or the crossmember to bolt up. Speedo sender will be different again as per different gear ratios and probably different fitment of the sender. In most cases you have to splice the manual loom into the auto or do a complete swap.

Yep, gearbox conversions are a hassle! Commodores are the easiest (you can buy ECU chips that convert the auto ECU to manual) and even they hurt your back.

HR31-PASSAGE Veteran

HR31-PASSAGE

Posted
  • Author
Posted
Not sure about interchangeable parts from auto to manual, as I'm not that familiar with the HR31, but I deal with people everyday wanting to convert their Commodores from auto to manual and the list I've given you is basically what needs to be done. I wouldn't expect the manual and auto gearboxes to be the same length (therefore different tailshaft) or the crossmember to bolt up. Speedo sender will be different again as per different gear ratios and probably different fitment of the sender. In most cases you have to splice the manual loom into the auto or do a complete swap.

Yep, gearbox conversions are a hassle! Commodores are the easiest (you can buy ECU chips that convert the auto ECU to manual) and even they hurt your back.

sweet cheers for that makes more sence now

Goddo Contributor

Goddo

Posted
Posted

Hi,

I lurk on SAU mostly, but I own a HR31 coupe and have done manual conversions on aussie R31s before.

Tailshaft - If possible, the easiest thing would be to get a complete manual tailshaft from a HR31.

Other than that, I believe the tailshaft yoke is different between auto and manual. You could possibly get a new tailshaft made out of your old auto one, but I believe you will need the manual yoke to suit your manual box.

ECU/wiring - If you were keeping the standard engine, this would be easy, as you can keep the auto ECU and modify the wiring to negate the auto's neutral switch (basically connect two wires together). WHat engine are you going to?

Speedo sender - Yes you can use the same one from the auto in the R31. However it may get a bit inaccurate, if it wasn't already.

Cross member - Usually the easiest thing is to get the manual one if possible. Again this probably depends on what engine and box you are going to. Not sure if you can use the auto crossmember. When I have done auto to manual before I have always had a manual one.

HR31s don't have a clutch cable, it's a hydraulic clutch :O

So you will need:

- Clutch master cylinder (one from a local skyline will also work)

- Clutch lines (could probably also get these from a local skyline if neccessary)

- Clutch slave cylinder (can be bought new for ~$27 if u need, once again ask for local skyline part)

- clutch pushrod (if you get a secondhand clutch slave it should come with this. basically its just a metal bar)

Good luck man, it may seem like a big job, but it's worth it.

Birds Grand Master

Birds

Posted
Posted

I always tell customers to sell their autos and buy a manual, unless they have some irrational sentiment for their particular vehicle because the conversion is costly and time consuming. The only exception to this is where manuals are particularly rare or did not come as option for that model.

Goddo Contributor

Goddo

Posted
Posted
I always tell customers to sell their autos and buy a manual, unless they have some irrational sentiment for their particular vehicle because the conversion is costly and time consuming. The only exception to this is where manuals are particularly rare or did not come as option for that model.

Hey Birds, yeah I agree. If a similar car can be found already in manual its a much easier option.

Saying that, I have fallen into your exception category :O

I also think that a conversion on an R31 might be cheaper and easier than some other cars...

HR31-PASSAGE Veteran

HR31-PASSAGE

Posted
  • Author
Posted
Hi,

I lurk on SAU mostly, but I own a HR31 coupe and have done manual conversions on aussie R31s before.

Tailshaft - If possible, the easiest thing would be to get a complete manual tailshaft from a HR31.

Other than that, I believe the tailshaft yoke is different between auto and manual. You could possibly get a new tailshaft made out of your old auto one, but I believe you will need the manual yoke to suit your manual box.

ECU/wiring - If you were keeping the standard engine, this would be easy, as you can keep the auto ECU and modify the wiring to negate the auto's neutral switch (basically connect two wires together). WHat engine are you going to?

Speedo sender - Yes you can use the same one from the auto in the R31. However it may get a bit inaccurate, if it wasn't already.

Cross member - Usually the easiest thing is to get the manual one if possible. Again this probably depends on what engine and box you are going to. Not sure if you can use the auto crossmember. When I have done auto to manual before I have always had a manual one.

HR31s don't have a clutch cable, it's a hydraulic clutch :blush:

So you will need:

- Clutch master cylinder (one from a local skyline will also work)

- Clutch lines (could probably also get these from a local skyline if neccessary)

- Clutch slave cylinder (can be bought new for ~$27 if u need, once again ask for local skyline part)

- clutch pushrod (if you get a secondhand clutch slave it should come with this. basically its just a metal bar)

Good luck man, it may seem like a big job, but it's worth it.

sweet cheers for that

if anyone has any of the parts i need let me know i'll buy them

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