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Parts for 235 Getrag 5 SPD, Dogleg Close ration transmission


Go to solution Solved by Dudeland,

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11 minutes ago, Furry Camel said:

From 4 speed to 5 speed, yes. From 5 speed to 5 speed (245 to 235), no.


Because the 235/5 was a factory option on ‘02’s, there is a factory driveshaft that fits it, perfectly. Yes, rare. But they’re out there. I was under the impression — perhaps wrongly — that a 245 5-speed installation required a custom-shortened driveshaft because the factory’s 235/5 driveshaft was not the correct length needed for a 245 installation. Yes? No?

 

Regards,

 

Steve

 

 

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1976 2002 Polaris, 2742541 (original owner)

1973 2002tii Inka, 2762757 (not-the-original owner)

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45 minutes ago, Conserv said:


Because the 235/5 was a factory option on ‘02’s, there is a factory driveshaft that fits it, perfectly. Yes, rare. But they’re out there. I was under the impression — perhaps wrongly — that a 245 5-speed installation required a custom-shortened driveshaft because the factory’s 235/5 driveshaft was not the correct length needed for a 245 installation. Yes? No?

 

Regards,

 

Steve

 

 

It depends on which flange/giubo you use. I use four bolt flanges on both my 245s and 235s, so my driveshaft doesn't change when I change between them. So yes, if you keep the original three bolt 245 flange, you'd have to have the driveshaft shortened a tiny bit. Bottom line, the transmission itself is the same length, it's what flex disk you go with that will determine what drive shaft length you need. *For those of you that think it's a mistake to use the original four bolt setup with a five speed, both Jeff Ireland and I use four bolt flanges in our race cars. I keep an eye on them for any stress related wear, they've been holding up just fine. 

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There is actually a slight difference in the actual length of a 235 vs a 245  but it must be small enough that the same drive shaft can work   Having just done a swap from a 8 bolt 235 to a 6 bolt 245 there is a slight difference in the driveshaft length,

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The gearbox is probably fine. Mine has done 143k and still going strong with no issues. Just had a few bits under the gear knob replaced. The guibo has just been replaced after 47 years. A little better than the one on my 4 year old E Class MB which is apparently starting to crack!

 

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Retro Engineering in the UK has most of the bits you need (unless the gears themselves are toast).

 

SHOP.RETRO-ENGINEERING.CO.UK

Retro Engineering Ltd, shop which specialises in classic motorsport parts and services. Speciality fields include classic BMW , Dolomite sprint and Jaguar XJS engine and gearbox rebuilding service.

 

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  • 2 weeks later...
On 10/13/2022 at 9:29 PM, rstclark said:

There is actually a slight difference in the actual length of a 235 vs a 245  but it must be small enough that the same drive shaft can work   Having just done a swap from a 8 bolt 235 to a 6 bolt 245 there is a slight difference in the driveshaft length,

 

You're correct - they are not the same length (well, so-says the 235 and 245 which sit side-by-side at my shop right now). -KB

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17 hours ago, kbmb02 said:

 

You're correct - they are not the same length (well, so-says the 235 and 245 which sit side-by-side at my shop right now). -KB

Well, where does one start, when you have a pile of misinformation? I guess at the beginning, so-says the 235 and 245 which sit side-by-side at MY shop right now. 
A6BD0874-887A-47FD-BB02-8C068F203907.thumb.jpeg.12de162feeb25bd484286a9ada6d1cc7.jpeg
 

Front section, both boxes 325mm. 
Middle section, both boxes 77mm. 

Rear section, both boxes 95mm. 
*Total length from bell face to face of rear flange both boxes 502mm. 
D22CAC0C-16BE-4BC4-8A5B-672CD668600D.thumb.jpeg.1d04962c2c5f027c32a13ded1d505dc1.jpegC3818B92-DD47-4406-8FD1-B58D7EC184A2.thumb.jpeg.5cc1d0f8ce1e71ad9886d3b925cfcbec.jpegF90021AC-0D2B-4E28-B94C-6ACC9691A310.thumb.jpeg.8d1a52780bea6ca19b0210842e39c404.jpegD6BCF8B3-AE55-4E5C-A184-A2276AFEEBD5.thumb.jpeg.01cb452d5f4b66d1327b447cdf9e7df1.jpeg

 

*Total length assumes both boxes are using the same rear flange. Regardless, both transmissions not including the rear flange choice, are exactly the same length.

Edited by Furry Camel
Further clarification
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4 hours ago, Furry Camel said:

Well, where does one start, when you have a pile of misinformation? I guess at the beginning, so-says the 235 and 245 which sit side-by-side at MY shop right now. 

 

245-10 Close Ratio vs 245 OD Box.  The Getrag 245-10 CR box may be the exact same size as the 235 box, but the 245 Getrag OD box has a very different output rear section which may account for the measurement differences between @Furry Camel and @kbmb02

 

Mark92131

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1970 BMW 1600 (Nevada)

 

 

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1 hour ago, Mark92131 said:

 

245-10 Close Ratio vs 245 OD Box.  The Getrag 245-10 CR box may be the exact same size as the 235 box, but the 245 Getrag OD box has a very different output rear section which may account for the measurement differences between @Furry Camel and @kbmb02

 

Mark92131

Thanks, Mark, but all this thread is about or supposed to be about is C/R boxes. If the references to the 245 is comparing an OD with a C/R, then apologies to all concerned.

Edited by Furry Camel
Potatoes.
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