Transmission grinds at low rpm
#1
Transmission grinds at low rpm
Hi guys,
Would anyone know why my transmission grinds when I shift from 1st to second or second to third when the RPMs are low? Whenever I try and shift at around 2500 rpm or lower the transmission grinds from 1st to second or second to third. When I shift at anything about 2500 RPM it shifts just fine.
Things you should know, transmission probably has not had a fluid change ever or for at least 50K+ miles. Shifter feels very loose and sloppy, seems like the bushings are done for. I'm guessing where the gears are sometimes... Also Im sure that brake fluid has not been bleed for a very long time. The clutch disk was absolutely shot, it literally had no friction material on it.
I'm hoping my transmission is fine and the only issue is the fluid and bushings, if not I guess its time to get a new (used) tranny.
Moe Greene
Would anyone know why my transmission grinds when I shift from 1st to second or second to third when the RPMs are low? Whenever I try and shift at around 2500 rpm or lower the transmission grinds from 1st to second or second to third. When I shift at anything about 2500 RPM it shifts just fine.
Things you should know, transmission probably has not had a fluid change ever or for at least 50K+ miles. Shifter feels very loose and sloppy, seems like the bushings are done for. I'm guessing where the gears are sometimes... Also Im sure that brake fluid has not been bleed for a very long time. The clutch disk was absolutely shot, it literally had no friction material on it.
I'm hoping my transmission is fine and the only issue is the fluid and bushings, if not I guess its time to get a new (used) tranny.
Moe Greene
Last edited by Moe Greene; 04-07-17 at 01:02 PM.
#2
RX-7 Bad Ass
iTrader: (55)
Start with the gear oil. Believe it or not Mazda recommends 15,000 mile changes on the gear oil!
I'm fixing to try the Idemitsu gear oil, I've heard good things. It's like $8-9 a quart and you need 3 quarts.
And DEFINITELY get new shift lever bushings. That makes a HUGE difference. Super easy to do as well.
If the gear oil doesn't do the trick, you're not out much money. But I've seen good gear oil do wonders for a transmission.
Dale
I'm fixing to try the Idemitsu gear oil, I've heard good things. It's like $8-9 a quart and you need 3 quarts.
And DEFINITELY get new shift lever bushings. That makes a HUGE difference. Super easy to do as well.
If the gear oil doesn't do the trick, you're not out much money. But I've seen good gear oil do wonders for a transmission.
Dale
#3
Start with the gear oil. Believe it or not Mazda recommends 15,000 mile changes on the gear oil!
I'm fixing to try the Idemitsu gear oil, I've heard good things. It's like $8-9 a quart and you need 3 quarts.
And DEFINITELY get new shift lever bushings. That makes a HUGE difference. Super easy to do as well.
If the gear oil doesn't do the trick, you're not out much money. But I've seen good gear oil do wonders for a transmission.
Dale
I'm fixing to try the Idemitsu gear oil, I've heard good things. It's like $8-9 a quart and you need 3 quarts.
And DEFINITELY get new shift lever bushings. That makes a HUGE difference. Super easy to do as well.
If the gear oil doesn't do the trick, you're not out much money. But I've seen good gear oil do wonders for a transmission.
Dale
Should I just play it safe and get another tranny or do you think fluid change + short shifter will fix this issue?
Also if the transmission grinds at low rpm shouldn't it grind at higher rpm if the synchro are bad? What would cause low rpm grind?
#5
Now obviously when I shift from 1st to second I don't hang out in neutral, the transition is much smoother aside from the grinding. The strange thing is if i shift from 3K+ RPM it wont grind.
Last edited by Moe Greene; 04-13-17 at 06:03 PM.
#7
Racecar - Formula 2000
So, yes, the fluid type makes a big difference.