transmission leak
Thread Starter
Advanced
Joined: Dec 2013
Posts: 64
Likes: 0
transmission leak
Could anyone give me an idea of how much it would cost to have a complete transmission oil seall kit installed for transmission. I recently discovered drops of fluid just right of center on floor.
Burning Brakes
Joined: Oct 2001
Posts: 1,241
Likes: 4
From: Okinawa Okinawa
Are you taking the transmission out of the car yourself?
20 bucks for parts and an hour for labor if you pull it yourself. 100 or less I would think.
If you don't pull it yourself, considerably more expensive.
20 bucks for parts and an hour for labor if you pull it yourself. 100 or less I would think.
If you don't pull it yourself, considerably more expensive.
Thread Starter
Advanced
Joined: Dec 2013
Posts: 64
Likes: 0
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
There are some seals/gaskets that you can replace (or have replaced) while the transmission is still in the car: pan gasket, rear output seal, speedo plug seals/O-ring, shift shaft seal, dipstick tube O-ring, modulator O-ring (if you have a vacuum modulator), and governor cover gasket.
However, you cannot change the input oil pump O-ring or the input pump seal without separating the engine and transmission.
Your best course of action is to clean the transmission off well so that you can determine exactly 'where' the leakage(s) occurs. Once you know where a repair is required, you can address it.
If your transmission has a LOT of miles on it, you might be better off just swapping your transmission for a similar unit that has been completely rebuilt; or have your unit rebuilt. But, if you have leaks that can be repaird "on the car", just do them yourself.
However, you cannot change the input oil pump O-ring or the input pump seal without separating the engine and transmission.
Your best course of action is to clean the transmission off well so that you can determine exactly 'where' the leakage(s) occurs. Once you know where a repair is required, you can address it.
If your transmission has a LOT of miles on it, you might be better off just swapping your transmission for a similar unit that has been completely rebuilt; or have your unit rebuilt. But, if you have leaks that can be repaird "on the car", just do them yourself.
Thread Starter
Advanced
Joined: Dec 2013
Posts: 64
Likes: 0
There are some seals/gaskets that you can replace (or have replaced) while the transmission is still in the car: pan gasket, rear output seal, speedo plug seals/O-ring, shift shaft seal, dipstick tube O-ring, modulator O-ring (if you have a vacuum modulator), and governor cover gasket.
However, you cannot change the input oil pump O-ring or the input pump seal without separating the engine and transmission.
Your best course of action is to clean the transmission off well so that you can determine exactly 'where' the leakage(s) occurs. Once you know where a repair is required, you can address it.
If your transmission has a LOT of miles on it, you might be better off just swapping your transmission for a similar unit that has been completely rebuilt; or have your unit rebuilt. But, if you have leaks that can be repaird "on the car", just do them yourself.
However, you cannot change the input oil pump O-ring or the input pump seal without separating the engine and transmission.
Your best course of action is to clean the transmission off well so that you can determine exactly 'where' the leakage(s) occurs. Once you know where a repair is required, you can address it.
If your transmission has a LOT of miles on it, you might be better off just swapping your transmission for a similar unit that has been completely rebuilt; or have your unit rebuilt. But, if you have leaks that can be repaird "on the car", just do them yourself.
Burning Brakes
Joined: Oct 2001
Posts: 1,241
Likes: 4
From: Okinawa Okinawa
Just re-read. If you are leaking right of center it sounds like it coule be a loose cooler line, vacuum modulator, or dipstick.
Really just need to find the source like 7T1vette said. May be a simple tightening of a bolt or a 10 dollar part. Good luck.
Really just need to find the source like 7T1vette said. May be a simple tightening of a bolt or a 10 dollar part. Good luck.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Don't forget- some cars had a TCS switch that is in the 3rd gear pressure port. The switch can leak also. And the location is real close to the dipstick on a TH350. Close enough it looks like the dipstick tube is the source of the leak.
2026 Loser of the Year
Joined: Sep 2013
Posts: 36,597
Likes: 7,046
From: New Or-leens Loo-z-anna
Lots of good info!
As for myself....I would rather buy a good repair manual/do the work myself....then use the "savings" to get those parts for the car that keep it looking new! That's why I built my own sandblasting cabinet for $100---it will be used to clean/restore original parts that would otherwise need to be replaced for cosmetic reasons (the $400 savings will be used to replace missing chrome parts on my project).
And to think---my first DIY was.....changing the oil & filter.
As for myself....I would rather buy a good repair manual/do the work myself....then use the "savings" to get those parts for the car that keep it looking new! That's why I built my own sandblasting cabinet for $100---it will be used to clean/restore original parts that would otherwise need to be replaced for cosmetic reasons (the $400 savings will be used to replace missing chrome parts on my project).
And to think---my first DIY was.....changing the oil & filter.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski