Leak at AT/Diff
Thread Starter
Drifting
Joined: Sep 2022
Posts: 1,784
Likes: 2,028
From: In the woods
2024 C5of the Year Finalist - Unmodified
Leak at AT/Diff
Moving my 2K yesterday it sprung a pretty significant leak emanating from the weep hole between the back of the transmission and the diff. %$#&^%$#!!!
Just how much of a PITA is this really? I know I have to drop the cradle to pull the diff and the source of the leak is the transmission, the puddle is ATF. Certainly seems a good time to change gearing....
Just how much of a PITA is this really? I know I have to drop the cradle to pull the diff and the source of the leak is the transmission, the puddle is ATF. Certainly seems a good time to change gearing....
Drifting
Joined: Feb 2025
Posts: 1,765
Likes: 1,778
From: THE BEACH..
Sounds like the Output Shaft Seal on the Transmission. Have to get the Rear Diff off of it to get to it so yea little bit of a pain. If you keep the 4L60E bolted up to the Torque Tube don't let it drop lower than the position its sitting in. Basically keep it supported up.
Race Director
Joined: Oct 2004
Posts: 12,795
Likes: 4,614
Merv is right. If you allow the trans to bring the rear of the torque tube down, the top rear of the engine will pivot into the firewall and break the Hell out of everything. Make sure you support the trans/torque tube well, with something secure......
Drifting
Joined: Jul 2004
Posts: 1,622
Likes: 651
From: Pingree Grove IL
If you change gears. I’d recommend 3.42 or 3.73. I went with 3.73, also a YankSS converter, 3200. On the expressway, I’m cranking about 2600RPM at 76mph. I love the steep gearing. 3.90 or 4.10 might be a little to much.
Race Director
Joined: Oct 2004
Posts: 12,795
Likes: 4,614
I went with a 3,200 Yank as well. That converter has been in there for 20 years and nearly 100,000 miles. IMHO, you can't go wrong with a Yank. I went with a stock C5 Z06 3.42 diff, and installed the beefed up/hardened (300M?) long side drive shaft. 2,600@76mph sounds right. My 3.42 turns around 2,300@75mph......
Drifting
Joined: Feb 2025
Posts: 1,765
Likes: 1,778
From: THE BEACH..
Yank makes excellent stuff. Them or Circle D.
Years ago I knew a couple guys who were doing a Rear Diff in a C5Z. Told them to support the T56 up and they didn't listen. Gravity happened and that car ended up totalled. They were under the impression that the Firewall was Steel and would support all that weight. Some learn the hard way.
Years ago I knew a couple guys who were doing a Rear Diff in a C5Z. Told them to support the T56 up and they didn't listen. Gravity happened and that car ended up totalled. They were under the impression that the Firewall was Steel and would support all that weight. Some learn the hard way.
Race Director
Joined: Oct 2004
Posts: 12,795
Likes: 4,614
Yank makes excellent stuff. Them or Circle D.
Years ago I knew a couple guys who were doing a Rear Diff in a C5Z. Told them to support the T56 up and they didn't listen. Gravity happened and that car ended up totalled. They were under the impression that the Firewall was Steel and would support all that weight. Some learn the hard way.
Years ago I knew a couple guys who were doing a Rear Diff in a C5Z. Told them to support the T56 up and they didn't listen. Gravity happened and that car ended up totalled. They were under the impression that the Firewall was Steel and would support all that weight. Some learn the hard way.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Drifting
Joined: Feb 2025
Posts: 1,765
Likes: 1,778
From: THE BEACH..