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Discussion Starter #1
I have a E34 M5 3.6 (5-speed manual) with gearbox problems.

I'm not able to select 1. or 2. gear, all other gears are fine. No noise when trying to shift to first or second, just not able to push the gear lever into the gears.

Anyone had the same problem?
Known bug or fix?

Tried searching both on this forum and google.

Think I'll try to split the gearbox my self before I send it to a transmission shop for rebuild.
Would be nice to know what to look after ;)
 

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Not entirely sure what would cause that, but I believe 1st and 2nd share the same shift rod/selector fork.
If splitting the box though, proceed with caution.
Success seems to very much depend on your skill (and tool) set.
 

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1 and 2 do share the same selector ring, and synchro hub.

might be worth having a look at your various shifter linkages outside the gearbox too. costs you nothing

as stated above, splitting the gearbox is very much dependant on your skills and tool-set. Getting it apart is actually very easy when armed with the appropriate manuals (search this forum). re-assembly however takes a lot of care and some special pullers to re-install the front case.

OP, where are you located?
 

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Discussion Starter #4
I'm located outside Oslo in Norway.

After lots of googleing I suspect that it could be a problem with one of the "Roll pins" or the singel ball bearings.
Both are accessible from the outside of the gearbox. Will check that before I split the gearbox. Seen others had the same problem where this has been the solution.

Will keep this thread updated :)
 

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Discussion Starter #5
Status update:

I've changed the lockpins and checked the single ball bearings. No luck.

Left it at a gearbox specialist yesterday, he suspects that a part of the fork for 1 and 2 has broken off.
 

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That's unfortunate.
I have some spare gearbox parts if you ever get to that stage and can't find any locally.
 

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Discussion Starter #7
Thank's!
I will keep that in mind when it comes to ordering new parts.

The most important thing is to get it back on the road! :)
 

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Discussion Starter #8
It ended up with a complete rebuild of the gearbox.
Lots of damage from an earlier "repair" in addition to a damaged shiftsleeve on 1. and 2.

Soon to be back on the road!
930896
 

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I don't have an inventory as such, but I have a whole dismantled box.
Some parts are E24/E28, most are E34, I think - 99% of the parts are common to both.
Some bits are no good though.
 

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i feel i will have to go down that path soon myself. i just recently got my m5 back from pretty much a full engine rebuild and now the second gear grinds when i downshift and only in second gear. i changed fluid with no luck so i will try to redline fluid. the transmission does make noise coming from input shaft bearing also.
 

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Discussion Starter #12
Picked up my gearbox after rebuild on monday, can't wait to get it back in the M5...
Hope to mount it next week! :D

Crossing my fingers to get a couple of trips in the M5 before winter comes to Norway!
 

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Discussion Starter #14
Yes, I'm very happy with that!

Did not think I would get to drive the M5 any more this season!
Will be in winter storage from November to March/April depending on the weather!
 

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Discussion Starter #15
The gearbox is back in place!
Went for a short trip yesterday after fitting it, everything seems to be in order! :D

932054
 
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