12 replies to this topic

[claysummers]

Question came up on the FBEK forum about the European origins of the Aussie marketed Opel 4spd, and whether it was based on the 4 or 6 cylinder version of the European box. Apparently there were two different versions in Europe.


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[yel327]

It’s a Phillipines made box if I remember right, might be Opel in origin like the 6cyl engines in South Africa were Chevrolet design but made in South Africa.

[claysummers]

They would have been in HB? In HR they had the tin cover, then upgraded in LC to the cast cover version I am told.


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[Indy Orange]

Different box in the HB Clay.Early 6 Cylinder Monaro had them in 186s and HR .Not real strong.

Edited by Indy Orange, 06 September 2025 - 10:58 AM.

[meanmachine72]

Blown a few up..
They dont like clutch
Dumps in 1st

[Indy Orange]

Rebuilt mine out of three,Input shaft seals are expensive,if you can find one.

Attached Files

•  IMG_1484.jpeg   213.72K   3 downloads

Edited by Indy Orange, 06 September 2025 - 12:29 PM.

[S pack]

Question came up on the FBEK forum about the European origins of the Aussie marketed Opel 4spd, and whether it was based on the 4 or 6 cylinder version of the European box. Apparently there were two different versions in Europe.


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Exact same OPEL 4spd as used in the 1967 OPEL Kadett - B Coupe F Rallye 1.9L 4cyl, 1967 OPEL Commodore  2.5L 6cyl and 1968 OPEL GT A-L 1.9L 4cyl
 

 

[claysummers]

Thanks Dave. I’ll feed that back to Harv.


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[S pack]

Question came up on the FBEK forum about the European origins of the Aussie marketed Opel 4spd, and whether it was based on the 4 or 6 cylinder version of the European box. Apparently there were two different versions in Europe.


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If they are referring to gear ratio sets as different versions then there were 3 differing ratio variants of the same gearbox in the OPEL GT 1900

 

 

The original ratio set the same as used in the LC GTR and GTR XU1.

 OPEL GT 1900 gear ratios.jpg   94.86K   2 downloads

 

Two alternative ratios sets homologated in November 1969.

 OPEL GT 1900 alternative ratios.jpg   106.67K   2 downloads

 

I may be incorrect however, I believe the above 2.87:1 ratio 1st gear transmission was the alternative LC 3100X XU1 Transmission listed in the LC XU1 Parts Catalogue (prior to the GMH XU1 specific M20 4 spd released in the CK XU1)
 

Edited by S pack, 06 September 2025 - 08:11 PM.

[claysummers]

Brilliant Dave!


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[Indy Orange]

Yeah but gaskets are different.Slightly.

Edited by Indy Orange, 06 September 2025 - 09:32 PM.

[Indy Orange]

Bought a GT opel gearbox gasket set from UK ,from memory bell housing to gearbox gasket different .

[S pack]

Bought a GT opel gearbox gasket set from UK ,from memory bell housing to gearbox gasket different .

That's interesting Paul, looking at many pics of the transmissions they look to be the same. However, I did notice the OPEL GT transmission has a switch (reverse?) mounted into the drivers side rear of the case.

The Aussie version has an expansion plug in that spot.