| Author |
Message |
DGS (Dgs)
Junior Member
Username: Dgs
Post Number: 135
Registered: 5-2003
| | Posted on Friday, July 04, 2003 - 1:09 am: | |
If your gearbox oil level is low, your transfer case oil will be low, too. You'd probably notice some rear diff lock-up in tight corners -- one tire skipping a bit at full lock steering (e.g. parking lot). |
Newman (Newman)
Intermediate Member
Username: Newman
Post Number: 1207
Registered: 12-2001
| | Posted on Thursday, July 03, 2003 - 3:53 pm: | |
If it grinds in one gear only, its not the clutch hanging up. All gears, yes. A fluid change might reduce it but the fact remains, the syncro ring is toast. Ferrari says if the gearbox is out for any reason and it has 30k on it, replace ALL syncro rings. Seems like overkill to me but thats what they say. 25 years later and who knows how many miles, one is bound to get tired. |
Gerrit Visser (Gerritv)
Junior Member
Username: Gerritv
Post Number: 200
Registered: 6-2001
| | Posted on Thursday, July 03, 2003 - 12:02 pm: | |
Hi
I had increasing amount of grinding problems up till the time I switched away from synthetic gearbox oil in my 1976 308GT4. Grinding gone. 110K KM on gearbox.
Also, check the engine mounts and the bushings in the strut at top rear of engine. Either of these could result in the apparently sudden onset of grinding that you reported. |
Ric Rainbolt (Ricrain)
Member
Username: Ricrain
Post Number: 536
Registered: 2-2002
| | Posted on Thursday, July 03, 2003 - 10:20 am: | |
If the lever is resisting gear selection, that sounds to me like the clutch might be dragging. A quick test is to put the car in neutral at a dead stop on level ground. Press the clutch pedal to the floor. Slowly attempt to engage first. Watch the ground right outside the driver's window. If the car appears to creep forward, even a little, then the clutch needs work.
Additionally, many gear selection problems in 308s can be traced back to a bad link bushing, right where the shift shaft emerges from the front of the oil pan. |
Bill V (Doc)
Member
Username: Doc
Post Number: 368
Registered: 9-2001
| | Posted on Thursday, July 03, 2003 - 7:39 am: | |
Mike--to check the oil level ( at least w a QV--and I assume yours would be the same(?)), you need to remove the 12mm plug from the rear of the tranny. The oil level should be right at the level of the threads of the plug hole ( stick your finger in there to " feel" the level). If it is low, you can add fluid directly into that plug hole. I recently did that with mine by running a small hose into it and slowly adding fluid. If you go for a complete fluid change, drain both the tranny and transfer case and with the car perfectly level refill through the transfer case until the fluid runs out of the rear inspection hole of the tranny. Once that occurs you have the proper level in both the transfer gear case and tranny. While I'm not a mechanic and am still a novice with my Ferrari, I'd start with a fluid change before doing anything more complicated.
Best of luck! |
Mike Procopio (Pupz308)
Member
Username: Pupz308
Post Number: 430
Registered: 10-2002
| | Posted on Wednesday, July 02, 2003 - 11:25 pm: | |
I'm now noticing problems shifting into all my gears--downshifting is pretty tough to do without going really slow, and getting second at high rpm is now all the sudden tough.
Will check the gear oil level (how do I do this??) and go from there.
|
Mike Procopio (Pupz308)
Member
Username: Pupz308
Post Number: 424
Registered: 10-2002
| | Posted on Tuesday, July 01, 2003 - 12:12 am: | |
I find that the problem does happen on aggressive upshifting as well (!!!). Double-clutching solves the problem.
Could a low gearbox oil condition cause this problem?
|
Mike Charness (Mcharness)
Member
Username: Mcharness
Post Number: 703
Registered: 8-2002
| | Posted on Monday, June 30, 2003 - 4:19 pm: | |
Regarding your synchro not working. The current thread at http://www.ferrarichat.com/discus/messages/112/267343.html?1056610049 and others that it references talk about Mobil 1 gear oil corroding synchros in old (308) Ferrari gearboxes... though this may be the first actual report on FChat of it happening, if that is indeed the problem and the cause.
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Mike Procopio (Pupz308)
Member
Username: Pupz308
Post Number: 420
Registered: 10-2002
| | Posted on Monday, June 30, 2003 - 1:27 pm: | |
It's been a year of one thing after another with this car, and I keep thinking I've just about got it perfect.
And then, you wake up one morning, drive to work, and discover you can't shift into third without grinding the gears. This is with the car plenty warmed up (200 degrees oil, 195 degrees water).
Looks like my 3rd gear synchro just stopped working. If I do a regular "normal speed" downshift, even when I blip the throttle (as I always do), it grinds... But, if I slowly engage over 5 seconds, very carefully, it'll eventually select.
I have no problem on the upshift, only on the downshift from 4th or from 5th. I have no problems with any other gear. I can even find second when she's really cold. (One of the lucky ones, I guess.)
Is this normal? To all the sudden develop a tired synchro like this? It's been just fine in the past (e.g. not a gradual thing).
I *cannot* pull the engine and work on the gearbox now--resources, time, etc.
Could this be related to gearbox oil level? I'm using Mobil 1... Changed one year ago, haven't checked the level since. Could a low level for gear oil cause this?
Am I double clutching for the next year?
1978 308 GTS, 56,000 miles.
Please help.
--Mike |