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Opel Gearbox extension housing


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#1 Indy Orange

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Posted 19 March 2020 - 08:31 PM

Hi all , the Opel extension housing on my gearbox is part number is 2893970? I'm not sure what this is off as the correct one should be
724186 according to the catalogue .
On a side note I have a spare extension housing here , part number 2877396.I believe this could be HR Holden , although it doesn't have the bracket for the shifter mechanism witch I would have thought would have been the same as LCGTR shifter set up.

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#2 Indy Orange

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Posted 19 March 2020 - 10:23 PM

Righto! Do I have the right housing?

#3 S pack

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Posted 19 March 2020 - 11:12 PM

Hello Paul, the housing without the shifter mounting is HK (assuming T & G also) with console shift. Part number 724187.

The housing with the shifter mount suits HK (assuming T & G also) with floor shift, LC Torana and should also suit HR. Part number 724186.

The part numbers on the housings are casting numbers. Finished parts often have a part number that is different to the casting number.

I trust someone will correct me if I'm wrong.

 

Cheers,

Dave.



#4 Indy Orange

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Posted 19 March 2020 - 11:25 PM

Cheers Dave , thanks for the help.

#5 yel327

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Posted 20 March 2020 - 08:34 AM

Just to add to Dave’s words:

All 4spd manual M20 were floor shift up to GTS volume production. There were a few different shifters but from memory they were all gearbox mount. After GTS production pretty much all M20 4spd Holden were console shift with the floor mounted shifter, the exception being Belmont sedan and possibly wagon (possibly no M20 in Belmont wagon) which remained floor shift.
So after about the first week of July 1968 an M20 with a floor shift 4spd was a very rare thing in a Holden, most were console shift. Almost all of them would be in Torana if they are a gearbox mounted shifter.
I’ve never kept one to check casting numbers for you either. Every single one I’ve ever had either stayed on the ute and went to scrap with other such useless stuff (like banjo centres) or stayed in a car I was wrecking and went with the car to the scrap yard once wrecked. I’ve pulled all the good stuff off around them in HK-HG Kingswood and Premier in wrecking yards, like consoles, shifter knobs etc but never the box itself.

#6 Dr Terry

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Posted 20 March 2020 - 11:04 AM

Yeah I'd have to agree. Every HT/HG M20 floor shift that I have seen were Belmont sedans.

 

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#7 Indy Orange

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Posted 20 March 2020 - 06:41 PM

Thanks Yel ,Dr Terry ,very helpful.

#8 u1 71

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Posted 20 March 2020 - 07:31 PM

The late John Brown owned a white HT panelvan with a 186 saginaw 4 speed and 10 bolt diff with gts wheels on it

#9 yel327

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Posted 20 March 2020 - 08:05 PM

The Saginaw M22 was the standard 4spd in any HK-HT commercial, always floor shift though. 10 bolt was not available even behind 253 though. Rally rims were optional on just about any HK-HG except Brougham.

#10 u1 71

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Posted 20 March 2020 - 09:42 PM

Yel327 It had the 10 bolt from factory.you should talk to his brother James he lives in Taree

#11 yel327

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Posted 21 March 2020 - 03:08 PM

I still doubt it very much. A dealer may have fitted it though, that sort of stuff did regularly happen. I have the GMH Engineering manuals and the actual special order pricing based upon what was actually possible for most of HK-HG. A 10-bolt in a 6cyl appears nowhere. There isn't even a tailshaft listed for it, and there is some obscure stuff in there. Like a V8 3.08 banjo fitted behind a 6cyl with Saginaw 4spd, there are parts and a special tailshaft for it but as far as I know none have ever turned up. GMH would have regarded a V8 banjo as a heavy duty option for a 6cyl - it was fitted behind all 253 and most auto 307 and 308 in HK-HG. They never considered the Salisbury for 6cyl. You can never say never though as some strange one-offs for internal use can turn up, but that could be all it could be, you'd never order one as it wouldn't get past the zone office.

 

My early July 1968 HK V8 auto GTS had a Salisbury in it since the late 60's and people thought it had always been there too. But it hadn't. The car has a banjo rear floor with banjo brake pipe mount, and the diff had a 1969 cast date on it. Someone must have gotten sick of breaking 2.78 or 3.08 banjos and fitted a 3.08 Salisbury in 1969.

 

The Saginaw was pretty common across HK-HT though. Every 6cyl HK-HG commercial with 4spd manual ticked got a Saginaw. It wasn't a cheap option though. A HK Belmont ute was $2083.11 in August 1968. It was $145.22 which is a 7% increase in price. A 186S over a 161 was only $124.60 in comparison. Or you could have a 5 litre V8, Saginaw and LSD 10-bolt for $548.05



#12 u1 71

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Posted 21 March 2020 - 05:07 PM

John told me it came from holden with all the gear on it 10 bolt included he sold it to someone in Hellensburgh Talk to his brother he knows all about it.One of the top BHP engineers in the 60's bought a brand new HT premier wagon with factory fitted 350 chev 2 speed glide how many were made ? I looked at an early 70 lina mint Lc Xu1 at a car yard in Campsie in the 90's which was advertised in the trading post it had a factory fitted 2bbl ww stromberg carby and linkages of an lc gtr

#13 yel327

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Posted 21 March 2020 - 05:18 PM

Possibly came from the dealer? You hear all the time about factory fitted stuff but it was dealer fitted.
There was only one HT other than a GTS350’with a 350 that I know of, the Brougmaro. I have heard of dealers swapping drive lines between cars, could be they swapped a GTS350 auto and HT 307 auto Premier wagon driveline over. Would be easy other than the rear brake hose would be a special.

Along similar lines I’ve lost count of how many 327 auto HK I have been told people had. No such thing. Invariably they turn out to be 307 auto.

#14 u1 71

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Posted 21 March 2020 - 06:59 PM

How many HK 327 gts' came from the factory with a vinyl floor as opposed to carpet i know of one.Holden was managed differently then by shop floor workers who rose through the ranks




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