Smallblock 77 TH350 low rpm first gear knocking noise
09-22-2014, 01:06 PM
#1
Heel & Toe
Thread Starter
Member Since: Jan 2005
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
Smallblock 77 TH350 low rpm first gear knocking noise
Please help me analyze the cause of that problem. I had a full rebuild to my th350. I have driven now with that rebuilt gearbox 1 month. After cople of weeks I noticed that with hot engine there will be knocking noise with 1st gear at steady speed ca 1200 rpm. When I accelerate slowli then the noise will end after gear change. When I decelerate then also the noise disappears. With 2nd and 3rd I cant notice that sound. Also if I accelerate more aggressevly from 1st to 3rd then there will be noise.
Sound of that noise is similar to hydraulic lifter. But is it logical that this noise is only with certain heat, gear and rpm?
Sound of that noise is similar to hydraulic lifter. But is it logical that this noise is only with certain heat, gear and rpm?
08-28-2019, 01:30 PM
#5
I’ve rebuilt more TR6060’s than I care to count. Your issues are shared by many folks. Especially shared by those that live in extreme climates, where winter temps are less than 30F and summers are plus 90F. The gear oil can’t keep up. As a consequence your bearings are shot. More than likely the synchros are on their way out. The Speedo gear has started to fail as well, All symptomatic of a tranny that needs new parts.
The fix? Get the TR6060 rebuilt, it’s cheap and quick. In the future, go with different viscosity synthetic oils to accommodate the temperatures. Same for your differential.
when I was stationed in Germany for two years, courtesy of the Marine Corps, I fondly remember icicles in winter and hot balmy summers. I’m sure that hadn’t changed much in 45 years.
The fix? Get the TR6060 rebuilt, it’s cheap and quick. In the future, go with different viscosity synthetic oils to accommodate the temperatures. Same for your differential.
when I was stationed in Germany for two years, courtesy of the Marine Corps, I fondly remember icicles in winter and hot balmy summers. I’m sure that hadn’t changed much in 45 years.
08-30-2019, 08:48 PM
#6
Melting Slicks
Member Since: Jul 2010
Location: perth western australia
Posts: 3,099
Received 599 Likes
on
533 Posts
Please help me analyze the cause of that problem. I had a full rebuild to my th350. I have driven now with that rebuilt gearbox 1 month. After cople of weeks I noticed that with hot engine there will be knocking noise with 1st gear at steady speed ca 1200 rpm. When I accelerate slowli then the noise will end after gear change. When I decelerate then also the noise disappears. With 2nd and 3rd I cant notice that sound. Also if I accelerate more aggressevly from 1st to 3rd then there will be noise.
Sound of that noise is similar to hydraulic lifter. But is it logical that this noise is only with certain heat, gear and rpm?
Sound of that noise is similar to hydraulic lifter. But is it logical that this noise is only with certain heat, gear and rpm?
Last edited by bazza77; 08-30-2019 at 08:48 PM.
08-31-2019, 11:35 AM
#7
Le Mans Master
Member Since: May 2002
Location: Lebanon Township New Jersey
Posts: 5,005
Received 706 Likes
on
401 Posts
I’ve rebuilt more TR6060’s than I care to count. Your issues are shared by many folks. Especially shared by those that live in extreme climates, where winter temps are less than 30F and summers are plus 90F. The gear oil can’t keep up. As a consequence your bearings are shot. More than likely the synchros are on their way out. The Speedo gear has started to fail as well, All symptomatic of a tranny that needs new parts.
The fix? Get the TR6060 rebuilt, it’s cheap and quick. In the future, go with different viscosity synthetic oils to accommodate the temperatures. Same for your differential.
when I was stationed in Germany for two years, courtesy of the Marine Corps, I fondly remember icicles in winter and hot balmy summers. I’m sure that hadn’t changed much in 45 years.
The fix? Get the TR6060 rebuilt, it’s cheap and quick. In the future, go with different viscosity synthetic oils to accommodate the temperatures. Same for your differential.
when I was stationed in Germany for two years, courtesy of the Marine Corps, I fondly remember icicles in winter and hot balmy summers. I’m sure that hadn’t changed much in 45 years.