Gearbox required

David Muench · Post by **David Muench** » Thu Jun 11, 2015 8:55 am

Anybody got a Getrag 280/5 gearbox for sale.

David.

Ed Lyerly · Post by **Ed Lyerly** » Fri Jun 12, 2015 12:52 am

David Muench wrote:Anybody got a Getrag 280/5 gearbox for sale.

David.

Unless you are a stickler for originality, the Getrag 265/5 is a more readily available alternate.

David Muench · Post by **David Muench** » Fri Jun 12, 2015 6:26 pm

Hi Ed

Thanks for the reply, yes I am trying to keep it original but at least there are alternative options if all else fails. I have not given up hope just yet of finding an E28 or E34 M5 box to take the input shaft out of.

David.

Da_Hose · Post by **Da_Hose** » Fri Jun 12, 2015 9:45 pm

Oy .....

Finding parts for a 280/5 is impossible. I hope you can find a good tranny.

Jose

GripGreg · Post by **GripGreg** » Fri Jun 12, 2015 11:30 pm

I agree with Ed & Jose`.

Also, I've read here that the 265 is the stronger tranny!
Maybe you should zero in on the 265 & not sweat originality?

Good luck,,,,Greg

Ed Lyerly · Post by **Ed Lyerly** » Fri Jun 12, 2015 11:53 pm

GripGreg wrote:I agree with Ed & Jose`.
Also, I've read here that the 265 is the stronger tranny!

That is not the case .... but they are very close. The 280 is built to handle 280 in Nm torque. The 265 is built to handle 265 in Nm.
I have several friends who have converted to a 265 because they cannot
obtain parts for (or a used replacement 280) for their M635 E24's. I know of no problems due to the slight difference in torque handling capability.

Da_Hose · Post by **Da_Hose** » Sat Jun 13, 2015 6:39 am

That's a good 411 on the numbers Ed. Technically the 285 might be rated higher, but the 265 has more durable syncro's and stronger shifter pawls.
That's why it breaks less often than the 280. So that would make the tranny stronger in my book.

Jose

David Muench · Post by **David Muench** » Sat Jun 13, 2015 10:35 am

Thanks for the input and support guys, will keep you posted as to which way it goes.

David.

wattsmonkey · Post by **wattsmonkey** » Sat Jun 13, 2015 2:24 pm

Please correct me if the following is wrong, as it's all based on what people have told me over the years.

The 260/6 is the poor relation and the weakest of the available options.

My understanding is that the 265/6 (i.e. the overdrive box) is the strongest. That's what I've got in my 635.

The 265/5 (the dogleg close-ratio box) suffers from synchromesh wear (as well as being a bit annoying, despite the cool ratios, on account of missing an overdrive gear to cruise around in and being a bit hit-and-miss going 1st to 4th instead of 1st to 2nd). I had one of these in my M535i and do not miss it.

The 280 appears to be great, and mine works fine in the M, but I thought they were a bit fragile?

Please educate me if the above is wrong, I'm currently trying to source a spare 265 for the M in case the 280 goes bang!

Either way, if you do find a 265 you'll have stiff competition from E-type owners, Opel Monza fans and E9 owners wanting five speeds! Oh yes, you'll need a different prop, too.

Cheers,

Rob

Da_Hose · Post by **Da_Hose** » Sat Jun 13, 2015 7:13 pm

Here is a great thread on swapping to a 265.

http://www.mye28.com/viewtopic.php?f=5&t=59684

As I said, the big issues in a 280 are weak, aluminum selector forks and inferior synchro design. When the synchro goes bad (typically 2nd), people will force the gear change and break the shifter fork. I plan to use MTL when I replace the tranny seals. I always rev. match and go easy on shifts into 2nd. ESPECIALLY when cold.

Jose[/url]

GripGreg · Post by **GripGreg** » Sat Jun 13, 2015 8:18 pm

Rob;
I had a '67 911S Porsche with the dogleg 5 spd.
I never had an issue shifting from 1st & going into 4th once I drove it for about a week!
It was my daily driver for about 6 years.
But then, those were my racing days and although I never put it on the track, I kept it in mind.
I loved driving it!

My info is that it's a racing tranny, which means once rolling you'll never need first gear till you stop.
Which I guess is why it's geared lower too.

m6dave · Post by **m6dave** » Sat Jun 13, 2015 10:36 pm

I've got one but it is in Australia. I will PM you.

David Muench · Post by **David Muench** » Sun Jun 14, 2015 3:50 pm

There is a bit of history to my 280/5 box. After seven trouble free years it developed notching going into third gear, I changed the oil for Redline MT90, after a while the notching progressed to changing down from third to second.
I removed the box and it was the syncros that were worn, but also the constant changing gear without effective synchromesh caused damage to the second and third gears. Also damaged, as Jose rightly said, were the selector forks.

I had new selector forks, gears and synchromesh fitted all round. This was fine for two years when it developed an oil leak from what I thought was the output shaft seal, the seal was changed by an independent BMW specialist, still leaked at the rear of the box, changed the selector shaft seal, still leaking at the back, changed the drive shaft flange, still leaking from some where.
I decided to remove the box to get to the bottom of this. I took the box to 'All Gears' who specialise in Getrag gearboxes and also did the gearbox repair, he noticed immediately that a core plug was missing from the casing adjacent to the drive shaft and causing the leak.
This core plug fills the hole from the selector rod drilling in the casing and was probably disturbed while fitting the new selector forks.

I had the box stripped while it was out to check for damage as when the oil was drained there was evidence of steel particles in the oil. This turned out to be from the input shaft gears.
Hence I would like to keep my refurbished 280/5 gearbox and just replace the damaged items.

Da_Hose · Post by **Da_Hose** » Sun Jun 14, 2015 8:15 pm

If you can find a rebuilder, pass on the info. I don't know of anyone in the US that rebuilds a 280. My understanding is that parts don't exist anymore.

Jose

David Muench · Post by **David Muench** » Mon Jun 15, 2015 10:23 am

m6dave wrote:I've got one but it is in Australia. I will PM you.

Hi m6Dave

Have sent you a PM, have you received it.

David.

m6dave · Post by **m6dave** » Mon Jun 15, 2015 11:03 pm

David Muench wrote:
m6dave wrote:I've got one but it is in Australia. I will PM you.
Hi m6Dave

Have sent you a PM, have you received it.

David.

yep just got it replying now
Dave

sskoda · Post by **sskoda** » Mon Jun 22, 2015 12:03 pm

280/5 is same box as in E34 M5? If so I have one in the workshop. If you're not sorted out.

Da_Hose · Post by **Da_Hose** » Mon Jun 22, 2015 4:35 pm

Hey folks.

I found out that Korman will still to a 280 rebuild, for about $3500. If you want a rebuild, you need to go to their site and contact their support folks with your transmission part number. They will confirm parts availability and let you know it's a go.

Jose

Pod · Post by **Pod** » Tue Jun 23, 2015 8:29 am

Da_Hose wrote:Hey folks.

I found out that Korman will still to a 280 rebuild, for about $3500. If you want a rebuild, you need to go to their site and contact their support folks with your transmission part number. They will confirm parts availability and let you know it's a go.

Jose

Wow! That's expensive

Da_Hose · Post by **Da_Hose** » Tue Jun 23, 2015 2:32 pm

Hell yeah that's expensive!

Metric Mechanic (and most other places) won't even work on them at all. They recommend swapping out to a 265, but the kit from MM is the same price as the rebuild from Korman.

Nothing is cheap when you are talking about the unique and "rare" bits for an M6.

Jose

Pod · Post by **Pod** » Tue Jun 23, 2015 2:36 pm

Da_Hose wrote:Nothing is cheap when you are talking about the unique and "rare" bits for an M6.

Yes, I know......I own three of them

Da_Hose · Post by **Da_Hose** » Tue Jun 23, 2015 11:21 pm

Yikes .... how can you afford food, mate?

Jose

GazM3 · Post by **GazM3** » Wed Jun 24, 2015 7:11 am

I really like the dogleg in my m635. With the 3.73 it was hilarious. I put a 3.45 in now and it cruises much better. The 3.25 ratio will be an option also.

I have a 420g 6 spd box which I'm thinking of converting to the m30 platform but I really like the dogleg. Then tight ratios keep the m88 on the boil and if u drive it like an old 4spd with an under drive first it works fine.

Goodlucj with your search.

Pod · Post by **Pod** » Wed Jun 24, 2015 9:34 am

Da_Hose wrote:Yikes .... how can you afford food, mate?

Jose

Send the wife out to work

David Muench · Post by **David Muench** » Thu Jun 25, 2015 8:34 pm

Fortunately I've managed to locate the parts I need from Australia, so I can keep the original box.

bigcoupe.com

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