Arjan B.

Hi,

Driving some days in Germany, reach some times top speed, the shifting starts to go difficult because of the heat in the gearbox.

This begins when driving about 10 min. at top speed, and in front of me, a car is passing a other car and I have to slow down, shift down from 5>>4>>3 and back up for acceleration.

When I drive 220 km/h or less then that for a few minutes, the gearbox cools off and shifting is <img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" /> normal.

The oil is fine, clear and no burned smell on it.

Somebody has the same expierience with this on street or track use???

Greetings,

Arjan
964 C2C 1992 Black

Adrian

Dear Arjan,
Please forgive me but what are you doing even thinking of changing gears at these speeds. Yes this is normal by the way. Maybe it is just the way you have explained yourself in the post. I know when I drive at these speeds and somebody makes me slow down it is both feet on the pedals normally. I worry about the gears much later. You must be slowing down to really low speeds to need to change gears to accelerate.
Ciao,
Adrian
911C4

Arjan B.

Adrian,

I don't talk about emergency stops, not at all.

I am slowing down very soon, and at the speed wich is good for shifting, I shift.
I am not stupid, I save my car.

Sorry for the incomplete story.

Arjan
964 C2C 1992 Black

jeff91C2T

What type of fluid are you running in your gear box? What kind of difficulty are having with shifting?? Can you feel the teeth when going from one gear to another??? I've run my 911 on the track but can't say I've had any problems. When I first bought the car it had swepco in the transmission so I went to a synthetic and it smoothed out the shifting (not as notchy).

BTW...where in the Netherlands are you. I'm actually visiting (Eindhoven) this week and next.

JW Hubbers

I think I have the exact same problem. When the gearbox is hot it's difficult to switch planes: 3-&gt;4 or 4-&gt;3 is OK, but 4-&gt;5, 5-&gt;4, 3-&gt;2 or 2-&gt;3 is difficult: moving the gear lever takes a bit of strength, as opposed to just slotting in with a flick of the wrist.

There's no grinding, it's just that moving the lever sideways is difficult.

For me it's the only really annoying thing about the car.

I had the shifting mechanism re-adjusted: it improved things a little (say 20% easier), but nothing to write home about.
After the adjustment the box shifts like a dream when cool though.

BTW, Gijs van Lennep didn't notice any particular difference between my car and another 964 at a trackday last year.

Oh, and in my case the reason for shifting is simple: I can do most of the Nurburgring in 3rd and 4th, but I do need 5th gear in 3 locations.

Cheers,

JW

Arjan B.

The difficult shifting means in my case the same as in J.W. Hubbers case.

Not the gears have problems to get in, only to move te moving of the gear stick front en back.

My oil is the original gearbox oil, factory filled. May be I should try a ather oil, this is may be better for a fresh fill after all these years.

Mister Seattle..........., welcome to the Netherlands. I am located in the East of the Netherlands, 5 km off the German border near Enschede.

Have a nice day all of you!!

Greetings,

Arjan B.
964 C2C 1992 Black

<img border="0" title="" alt="[Wink]" src="wink.gif" />

Jeff Curtis

When my car is getting good and warm on track days, I tend to "knick" third gear during upshift and when downshifting from 5th to 3rd in a braking zone. <img border="0" title="" alt="[Eek!]" src="eek.gif" />

YES, I don't go to 4th...it's a bit difficult during threshold braking!!!!!!

What's starting to worry me is the downshifts from 5th to 3rd more than the upshift w/"knick" to 3rd from 2nd.

Sometimes I get a pretty good "grind" during the downshift and blame it on that damned clutch pedal issue we all seem to have!! <img border="0" alt="[grrrrrrr]" title="" src="graemlins/cussing.gif" />

I may try going from 5th to 4th, then 3rd during hard braking...but sometimes I barely make it to 3rd!! ...how the hell am I going to downshift TWICE??

OH well, maybe I need to slow down a bit, no PUN intended. <img border="0" title="" alt="[Wink]" src="wink.gif" />

Aside from blaming changes in viscosity when the lube is good and hot, I'm more towards blaming rotational mass, with a LWF, the layshafts get to slow down a considerable amount more when compared to having that extra 19lbs on the drivetrain, consequently, I don't think they're "up to speed" when asking to upshift or downshift rapidly, and worn synchros, whos job is to get the mate gear you're in the process of selecting up to speed before complete engagement of said gear, could be a bit worn, that is, the rough texture used for traction during gear enagement is getting smooth.

This is NORMAL wear, mine just might be a little more accelerated than others!! <img border="0" alt="[hiha]" title="" src="graemlins/roflmao.gif" />

I guess I just need to quit attempting to break the 200MPH threshold eh? <img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" />

John Boggiano

</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by JW Hubbers:
<strong> I can do most of the Nurburgring in 3rd and 4th, but I do need 5th gear in 3 locations.

Cheers,

JW</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">Dottinger, and which others? (he asked, turning green).

JW Hubbers

You better hope that Kevin Ross doesn't see your "turning green" post, John... <img border="0" title="" alt="[Eek!]" src="eek.gif" />

Apart from Dottinger Hohe I need 5th gear between Flugplatz and Schwedenkreuz, and when going down Fuchsrohre <img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" />

Cheers,

JW

JW Hubbers

To react to a point Jeff made: I don't blame rotational mass: the stiffness is felt when moving the lever between two sets of gears, not so much when engaging a gear. Not to mention that I do double-clutch downshifts to give the syncros a hand

Cheers,

JW