Is it OK to drive without the propshaft?

[blue95]

I am currently converting my corrado to acocmodate the syncro running gear.

Basically I need to run it for a while with the syncro rear subframe in place inc drivshafts, diff etc but no propshaft.

Do I need to disconnect anything? i.e. vacum connection on back of diff? for ref the diff is currently not wired up to anything, so I guess I have no freewheel lock control.

Hope this makes sense!

Cheers

[Chris S]

The freewheel is turned on and works all the time, it is locked out and turned off when you are in reverse so that you have 4wd when going backwards, as you patently do not have 4wd I cant see it making any difference, just make sure the rear diff has oil in it please as even though it is not driving it will still be rotating and will get hot, also do not remove the rear diff mounted control box
For diagrams have a look at photos chris s – technical info – then the last 4 photos in there

[blue95]

Chris thanks for your reply.

Excuse my syncro ignorance []

When I do connect up the prop and have the potential for 4WD, do I need to have the vacum line connected or the wiring to the rear diff?

I undertsand what the wiring does, what exactly does the vacum line do?[]

Is there anywhere I can get further detailed info on the 4wd works?

Thanks

[Chris S]

Q) When I do connect up the prop and have the potential for 4WD, do I need to have the vacum line connected or the wiring to the rear diff?
A) yes
For diagrams of the rear diff have a look at photos chris s – technical info – then the last 4 diagrams in there
it shows how the rear diff vacuum etcetera works

[1.8TsyncroB3]

The safest way to run without harming the rear diff is to install just the rear outer CV joints without the axles and balls. This holds your rear wheel bearings and hubs together, but doesn’t spin the rear diff internals. If you are not running ABS, then the small Mk1 or Mk2 front CVJs will fit the rear of the syncro, saving you having to dismantle your syncro rear axles.

[blue95]

Thanks

Plenty of options there!

I only plan to run the corrado for a few days without the prop, and even then will only drive 25-40 miles in total at sensible speeds!

Once the prop is in I plan to run without the vacum line and electrics attached to the diff. I understand this will enable 4wd, but reversing will be a bit of a problem!

I eventaully will plumb in the vacum and electrics though![]

Cheers

[VR6SyncroMark2]

Thats an interesting idea.
Sounds like a good short cut to get the car running with out all the sensors etc?
Whats the problem with reverse?

quote:

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Originally posted by blue95

Thanks

Plenty of options there!

I only plan to run the corrado for a few days without the prop, and even then will only drive 25-40 miles in total at sensible speeds!

Once the prop is in I plan to run without the vacum line and electrics attached to the diff. I understand this will enable 4wd, but reversing will be a bit of a problem!

I eventaully will plumb in the vacum and electrics though![]

Cheers

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[Chris S]

The only sensor (if it can even be called a sensor) on the Syncro system is in the reversing light/neutral switch mounted on the gearbox which disengages the free wheel when you select reverse, the Syncro system is very simple and works without the need for any electonics, chips or computers, its the VC unit that hydraulically controls the power output to the rear wheels and a vacuum diaphragm operated by a solenoid controlled from the reversing light switch controls the 4wd in reverse,
btw, the bonk you hear from the rear of the car when you first reverse is the free wheel disengaging.

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