| Author | Message | ||
| '75 308 GT4 (Peter)
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THANK YOU VERY MUCH FELLOW GT4'er, TIMOTHY! I honestly couldn't tell you folks how the forth gear crunch was eliminated on my car. I touched nothing in the trans. and now it shifts no problem, cold or hot (with 80W90 dino oil). John, maybe a shifter fork is out of alignment and what you think the stick-shift is dead-on in the slot, it could really be making it ride on the edge of the synchro ring. | ||
| Timothy J. Dressel (Tjd)
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Peter, et. al., Last night, I measured the flywheel of my '75 gt4. It's about .610 inch thick at about 1/2 inch from the edge. I don't know if it's been cut before. The car is very high mileage; but I see the full timing marks, and I don't see the usual swirl marks I've seen on other flywheels that have been resurfaced. --tim d | ||
| BretM (Bretm)
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Yeah it is the synchros definitely to a certain extent (Ferrari's trans is a little notchy, synchronization is prone to crunch a bit especially when not fully warmed). I was just wondering if there was any way to minimize the design flaw either with making the other parts like new again, adjustment, etc. It's not a big deal really, it's not like it grinds or anything, just wondering. | ||
| TomD (Tifosi)
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I am not an expert but the crunch is usually the syncros $$$$$. But you might want to consider since you have yours apart. Peter will know better | ||
| John Delvac (Johndelvac)
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Peter, I don't think it crunches going into 4th. Something seems to be vibrating to a rattle within 12" of the shift gate. It stops if I hold my hand on it. | ||
| BretM (Bretm)
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Mine does Peter unless I either shift fast (basically math engine and trans speed) or wait a sec for the engine to come down to idle. What'd you do or what can be done to eliminate this Peter? | ||
| '75 308 GT4 (Peter)
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John, when engaging fourth, does it slightly crunch (occasionaly, at different road/engine speeds)? | ||
| John Delvac (Johndelvac)
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The Mobil 1 Syn made a huge difference in my 328. You can shift into 2nd cold, but it feels like trying to stir cold honey with a spoon. Be firm but not forceful. In any case, it warms up enough to actually shift way sooner. Now, I've developed a vibration rattle when I'm in 4th. Hope it's nothing serious 'cause I'm ignoring it. | ||
| Ernie Bonilla (Ernie)
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Ah I'm getting used to this thing fine now. Check this out, if I don't accelerate hard I can shift without using the clutch, accept of course when you first take off. No gear grinding at all, comes out easy and a nice chuchunk as the next gear engages. Just make sure your rpm's are even. Also you can take it nicely out of gear when slowing down without using the clutch. The flywheel in my car is vastly different from the one in the 308. It has some internal parts to it, that got melted as a result of the clutch not being replaced when it should have, by the previous owners. So resurfacing wasn't an option. | ||
| '75 308 GT4 (Peter)
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The WSM states no more than 0.8mm of WEAR on the flywheel. But from what original measurement?!? I have been assured from some of the more technically-knowledged folks here, that as long as half the timing marks are indicated, is the limit (more so for legibility reasons, you don't want to mis-time the cylinders!!). Just the bottoms of the letters/numbers on mine have been cut away. PLEASE, IF ANYONE OUT THERE HAS A VIRGIN FLYWHEEL IN THEIR HANDS, WRITE THE MEASUREMENT/THICKNESS HERE, SO WE CAN ADD IT TO OUR MANUALS (AND FUTURE FC TECH DATABASE). PLEASE NO JOKES ABOUT MY VIRGIN COMMENT ABOVE.  | ||
| Richelson (Richelson)
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Peter, how much can you take off on the fly wheel? | ||
| '75 308 GT4 (Peter)
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I had mine resurfaced and it is fine. I had an earlier problem of forth-gear engagement before my rebuild and now its gone, without touching the internals of the gearbox (although with so much else done during then, it can be attributed to anything: shifter re-alignment, new clutch, etc...). Either way I'm happy.  | ||
| Nika (Racernika)
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I found you have to be careful if they resurface your fly wheel - this can throw the geometrics off and have the car shift notchy.......I learned the hard way to ALWAYS replace it. | ||
| Ernie Bonilla (Ernie)
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I just got my car back and MAAAAN what a difference. This thing is a complete new animal. The clutch engagement is almost instant. I even stalled the car a couple of times cause I wasn't used to it yet. I have to relearn it, get the feel of the car. The shifter also had some loose cables that I had the mechanic tighten up, that helped out. But it is still a bit notchy for the gear changes. How ever I am findng that there is a nice rpm band that you can shift very smoothly in. I'm still feeling it out. p.s. ((((((( DO NOT )))))))) burn your fly wheel fellas just the part was $3,000, and that is separate from the clutch. | ||
| magoo (Magoo)
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USE MOBIL 1 SYNTHETIC gear lube. The best lube for the ultimate performance in Ferrari transmissions. If it doesn't improve you may have a problem. | ||
| Richelson (Richelson)
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John, that is correct. | ||
| John Bicsak (Funshipone)
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I think this was said once before, but in case it was missed I was told not to shift into second in my 308 until trans is warm. | ||
| Martin (Miami348ts)
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Najib, mine is harder as well but it goes away the more you drive. Ernie; you will be amazed. Once the new flywheel and clutch is in it will feel super hard. At least that is what it did with mine. The more you drive the easier it shifts. | ||
| Peter S�derlund/328 GTB -88 (Corsa)
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The transmission oil has a part in this issue. I'll try Red Line 75w-90NS. The NS-oil will give smoother shifting and harder engage in the LSD. NS is recommended for race applications and 328. I'll come back and tell if this really happend as soon as the snow disappear. Ciao Peter | ||
| Frank Parker (Parkerfe)
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I think its the gate and not the shifter. My 400 GT was a five speed without a gate. It just had a leather boot like most other non-Ferrari shifters. It shifted like a Honda, very smooth with no notchiness like gated Ferrari shifters. | ||
| Ernie Bonilla (Ernie)
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Yeah mine did shift hard. I said did cause it is in the shop right now. Had a new clutch and fly wheel put in. Also my mechanic is going to check the shifter. I'll let you know if there is a difference after I get it back. How ever before it was in the shop it did seem to shift smoother after the transmission was warmed up a while. | ||
| Richelson (Richelson)
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Definitely the way a Ferrari shifts. I truly enjoy the way the Ferrari shifts. It feels like a very well made, solid car. I don't like transmissions that shift that easy, like a ford etc. Your comparison to a bolt action riffle is quite correct. It is a notchy shifting car. Enjoy it. | ||
| Najib Amanullah (Najib)
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I had never driven a Ferrari before buying my 348 and mainly owned German cars with automatic transmission (except my stick shift 3 series BMW) or Japanese 4x4s with manual transmission before. I find the gear change on the Ferrari is quite firm. No where near as soft as the Japanese cars or even the German cars. After warming up nicely, all gears work well without grinding but need a fast, firm action. It is very similar to the way you see these guys changing gears in their Rally cars on an in-car camera - much like operating a rifle bolt. Is this only on my car or is this common for all Ferraris? I am not complaining as it gives the driver an added sporty feel - just wanted to know if it is normal. |