Zeephyrin

What 5 speed transmission did I buy?

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Hi, 

 

I plan to do 5 speed conversion and the only 5 speed gearbox which the seller had I brought home. Looking at it, I am not exactly sure, what type it is and what are the gears. Can you please advise?

 

thank you, 

Martin

 

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Edited by Zeephyrin
Taking out the price of the item

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I'm no expert, and I'm sure someone will chime in if i'm wrong, but the 245 is distinguished by a 3-piece casing (which yours appears to have) so i'd assume you've lucked out with a 245. What did ya pay? 

 

240's are 2 piece cases, and 260's are behemoths. 

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Looks like a similar issue that someone had just recently. Bought m20 gearbox to install to m10. It doesn't fit.

I can't find the thread now. In that case you don't have to worry about gears because you're not able to install it. 

 

You're probably located in Europe or elsewhere but in US. That makes the mistake more probable because m20 5-speeds are easier to come by than m10 ones. 

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I just noticed the 242 numbers, isnt the 242 the 4speed?

 

Edit... After some google action it appears that the 242 could very well indeed be the e21 6 cyl. 4 speed trans.

 

http://www.bmwe21.net/?page_id=124

Edited by 2002Scoob

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Casting number. I think the extension section means it is definitely a 5 speed, just not for an M10

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6 hours ago, Simeon said:

Casting number. I think the extension section means it is definitely a 5 speed, just not for an M10

 

+1

 

I suspect that casting number is on the rear cover, which may well be shared by multiple transmissions.  But the trans is far too long for a 4-speed.

 

Regards,

 

Steve

 

Edited by Conserv

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Measure the spacing between the two top holes that correspond to the flat spot on the block that appears at 1 to 2 o'clock as viewed from the rear of the block and correspondingly the front of the transmission. The spacing for the M10 is 4.75 inches while the M20 is 5.5 inches. The transmissions are not interchangeable because the bell housing/block patterns are different.  

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The fact that the reverse switch is on the rear tells me it is definitely not the 245 that we know and love.  There's a thread with a post by Ace Andrew that lists the various gearboxes and I know I've seen this one on that list.  I just can't seem to find that thread (but I saw it a few days ago).

 

Ya know, it does resemble the close ratio 5-speed.  If it is, you just struck gold.

 

Although, M20 application seems like the more likely answer.

Edited by Healey3000
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A lot of good info, thanks a lot.

Now I think I know what I've got: the spacing between the two top holes is 5.5", plus the position of backup switch indicates it likely is for EU version of E21 M20 car, dog leg close ratio box. Not exactly what I need, besides it might be sought after by E21 crowd. I did not pay much for it, so will need to look for the right box once more time.

 

 

Martin

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X2 

 

Close/Ratio Getrag 245/11 Transmission for the E21 323i or 320/6 (M20 6-cylinder).  

 

If you find the front section from an M10 Getrag 245, it can be swapped on by an experienced transmission shop with the right tools.  The left-over M20-compatible front section has value for someone doing an M20'02 build.

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No E21.

If E21 there should be a speedo cable junction, but there isn't:

 

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My guess is E28 and it's definitely from an M20. Not only because of the distance of the two mentioned holes but also because of their bigger diameter.

Interesting to know about the code stamped above between these two holes. GH for example stands for E21 with M10 (not late 315), GG stands for E21 with M20.

 

hen

 

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