Transmission Problem. could use the experts opinion or help
#1
Rennlist Member
Thread Starter
Transmission Problem. could use the experts opinion or help
Ive always been fearful of the 928 gear box popping out of gear when in second. (my old 84 used to do this for many years). anyway, the s4 didnt really do it, until during this last race at sears. it stays in 2nd gear fine, unless you are not accelerating or decellerating. in a neutral power mode, it will pop right out of gear and go into neutral. (actually that grinding position between neutral and in gear)
Is there kind of part that really keeps the transmission in gear? if so, can it be changed or modified while the transmission is in the car, if i have the transmission access on top of the trannie?
Thanks,
Mk
Is there kind of part that really keeps the transmission in gear? if so, can it be changed or modified while the transmission is in the car, if i have the transmission access on top of the trannie?
Thanks,
Mk
#3
Administrator - "Tyson"
Lifetime Rennlist
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Lifetime Rennlist
Member
What kind of transmission fluid are you using?
#4
Former Vendor
Everything that keeps the transmission in gear is inside the transmission, unless you have something restricting the gearshift movement or something loose (like the torque tube.)
What year is the transmission?
What year is the transmission?
#6
Team Owner
could also be a bent shift fork once its bent then the fork will move the gear back just enough to jump it out of gear usually happens from shifting fast through the gears
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#8
Three Wheelin'
I've had alot of trans issues but never that.
I'll bet that it's an external force of something moving or the linkage never having made it all the way in the first place.
Any flopping or vibrations in the chassis will have an effect on the shift linkage.
Do you have a stock shift coupler with compliance?
If you disconnect the coupler, is there resistance in the shifter at #2 position?
This could also simply be your mAd sk1lls!
I'll bet that it's an external force of something moving or the linkage never having made it all the way in the first place.
Any flopping or vibrations in the chassis will have an effect on the shift linkage.
Do you have a stock shift coupler with compliance?
If you disconnect the coupler, is there resistance in the shifter at #2 position?
This could also simply be your mAd sk1lls!
#9
Former Vendor
The syncro only slow or speeds the gear up. It doesn't actually do anything to keep the slider engaged with the engaging teeth on the gear. The "teeth" have a "negative angle" on both the engaging sleeve and the engaging teeth on the gear. When the teeth are fully engaged (and in good condition) these two "negative angles" are touching each other, which effectively "locks" the two pieces together.
If the "teeth" are not able to fully engage (something limiting the travel of the shifter, bent shifting fork, etc.) the transmission will pop out of gear. Wear on the teeth can also this to happen. Excessive endplay or a bearing issue will also allow enough movement to allow them to pop out of gear.
If the "teeth" are not able to fully engage (something limiting the travel of the shifter, bent shifting fork, etc.) the transmission will pop out of gear. Wear on the teeth can also this to happen. Excessive endplay or a bearing issue will also allow enough movement to allow them to pop out of gear.
#11
Former Vendor
#13
Archive Gatekeeper
Rennlist Member
Rennlist Member
Can't imagine how one could bend a fork when they're captive on a 1/2" steel rod, but if there has ever been a 928 drivetrain that had a significant amount of bending force sent down its torque tube and pinion gear, it's the Holbert car:
#14
Rennlist Member
The syncro only slow or speeds the gear up. It doesn't actually do anything to keep the slider engaged with the engaging teeth on the gear. The "teeth" have a "negative angle" on both the engaging sleeve and the engaging teeth on the gear. When the teeth are fully engaged (and in good condition) these two "negative angles" are touching each other, which effectively "locks" the two pieces together.
If the "teeth" are not able to fully engage (something limiting the travel of the shifter, bent shifting fork, etc.) the transmission will pop out of gear. Wear on the teeth can also this to happen. Excessive endplay or a bearing issue will also allow enough movement to allow them to pop out of gear.
If the "teeth" are not able to fully engage (something limiting the travel of the shifter, bent shifting fork, etc.) the transmission will pop out of gear. Wear on the teeth can also this to happen. Excessive endplay or a bearing issue will also allow enough movement to allow them to pop out of gear.
#15
Former Vendor
Far be it from me to say what is possible and what isn't possible. I'm just saying that I've never seen one. The aluminum forks are made from such a stiff aluminum that they crack and break when stressed. The bronze material....I have no idea. Never seen one bent or cracked in a 928 transmission.