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Grinding Tranny Mod 2

By: Richard Jackett

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Grinding Tranny Mod version 2.0 "High-heel and Toe Edition"
for rFactor by Richard Jackett (hardjack79 at nogrip)

Using your H-pattern shifter, if you change gear without using the clutch and do not match the revs closely enough you will hear the gearbox grinding, and you will remain in neutral until you re-shift using the clutch (alternatively you can set the mod to accept just a re-clutching instead of a full re-shift, or even to have a fixed delay). If you use the clutch properly then your shifts will always be successful.


Detects when gearshifts should not succeed and makes the gearbox react accordingly, leaving you in neutral.

NEW: After missing a shift, a full clutched reshift is now needed (clutch-only and fixed time options also available).

NEW: Has its own sound engine to play grinding sounds (or optionally use rFactor's horn function).

NEW: Driver name and control details are now automatically detected so editing of the ini file is no longer needed.

NEW: Plugin can be turned on/off from within the upgrades menu, and can use different settings for each car.

NEW: Real-time output of gearbox state (grinding or not grinding) so that hobbyists can add FFB to their gear shifters.

IMPROVED: Telemetry can be written to a console and/or a text file to help you analyse your shifting technique.

Automatically loads the current gear ratios for your car every time you hit the track.

Highly customisable via an ini file, which is reloaded every time you hit the track.

OLD: A developer that is keen to hear suggestions and bug reports to improve the plugin.


1. In your controller.ini / plr file you should have "Gear Select Button Hold" enabled, and "Auto Clutch", "Auto Blip", and "Auto Lift" disabled.
2. Unpack the archive to your rFactor installation folder (e.g. C:\Program Files\rFactor).
3. In rFactor, go to the Controller panel, and map a key to the "Neutral" function.
4. Also in the Controller panel, make sure Upshift and Downshift are unmapped, as these affect how rFactor treats shifts.

Link to official thread to follow soon.
Letter to Mod Developers:

Community Rating

Overall rating since initial release  
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Latest Grinding Tranny Mod Comments

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awesome cars! love this
looneyhans on Feb-08-2021

interior painting awesome website. love this
looneyhans on Nov-11-2020








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bayu01 on Sep-15-2017

Awesome site.
markjames on Apr-19-2017

hello... i am wondering where the heck is the .plr file??? where is it? what is it?
Tomppelix on Feb-28-2013

Thanks for the thoughtful comments and suggestions gringosan, Kujo42, and elbo. I don't get notifications when you post here and its been ages since I've stopped by, so sorry the reply is so late.

Kujo42, the shift up shift down thing is a real pain, I agree. I'm not sure if I can find a way around it because it changes how rFactor treats neutral rather than anything I do in the plugin. However I will have a look into it if I ever update the plugin.

elbo, does rFactor2 still not include a (more politely named) missed gear feature? I don't have it yet but a port is not out of the question if/when I do, depending on if they've shut off the tricks I used to make it work.

I keep meaning to make a demo of the FFB/tactile shifter that is possible with the existing plugin, so that should probably come before GTM3.0. But all these ideas are great -- most of what changed from v1 to v2 was from forum comments and suggestions from the HistorX team, so I really do appreciate you taking the time to let me know what you think and what would make it better.
richardjackett on May-01-2012

I've stated before how highly I think of this mod. It truely puts the sim in simracing.
Okay enough sucking up...I'm writing to ask if you are going to port this over to rfactor2. It is just not the same shifting without the stress of a grinding tranny hovering over you (That's right I said it, another bad grinding tranny pun, sorry).
elbo on Feb-14-2012

Thank you for developing such a wonderful add-on!!
(I know it's been around for a while now, but I only just bought my G27 during the summer...which replaced my Logitech MOMO wheel.)

It took me a while to get the hang of heel-toe downshifts (man, can it ever feel 'foreign' at first!!), but I still wondered if I was doing it 'right'.
Having installed this add-on, I was pleasantly surprised to find that I was - 95% of the time - properly rev-matching.
In testing the add-on out, I found I had to purposefully shift incorrect just to get it to trigger.
In a race, I can now identify when/where I tend to grind the gears and have actually seen an improvement in my shifting as a result.

I did, however, have to do some tweaking in the .ini file to my liking.

I found the included sound file didn't match almost all of the mods I like racing. In fact, most of them already have a shift 'sound' by the way the add-on itself operates when you miss a shift (IE: repeatedly hitting the 'neutral' key), it was always obvious I'd messed up, because the engine + shift sound was totally different...and I'd get a loss of power.
So I just turned it off in the .ini

I also didn't quite like how by default, you have to shift out and then back into gear.
Technically in real life (I guess dependent on the vehicle as well), if you shift incorrectly (up or down) the transmission shouldn't let the shifter into the 'gate'...producing the grinding noise. Since the G27's H-shifter has no bias whether you are shifting correctly or not, and in some cars the gears will 'half-engage'; I changed the "Re-shift Method" in the .ini file to '2' that engaging the clutch (without moving the shifter) will get me into gear properly, which I feel is much more 'realistic'.

I would like to make one suggestion, should there be more updates in the future.
Could you please find a way to remove having to un-map the 'shift up' / 'shift down' keys in the game?
I do enjoy driving some mods where the cars involved shift via paddles on the steering wheel. Since I like to drive with as much realism as possible, I always had the paddles on my G27 mapped, so when I drove those mods I would use them to shift. If I could get that ability back (without having to constantly disable the mod and re-map the keys) that would be awesome!

Again...great job on the add-on!
A much welcome addition to making sim racing that much more 'real'.
Kujo42 on Dec-26-2011

Fantastic addon

Thanks for developing this gem

installation took some time to get right... I needed to search forum to solve some issues. Please update the included instructions in the download.

1. Make the point that you must map a keyboard key for neutral... I tried to use a controller button and then , (comma) but had to use keyboard "n" to get it to work. This lead me to the odd head shaking when missing a shift. Also (i think) prevented the re-clutch to engage gear feature from working, the missed shift just timed out and went into gear.

2. Took some time to figure out the "Gear Select Button Hold" is in the (Controller INI)

The log feature help trouble shooting the issues, as did the forums but the user should not suffer for some good instruction.

gringosan on Nov-02-2011

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