Thread: Why is this tranny leaking

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700R4 and brand new never run.
I read on a website it would need 6 qts. to fill. I filled her and later noticed a big puddle underneath. It is dripping fluid out the tailshaft. I hope I just put too much fluid in it.
How many qts. does it take?????
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If it's leaking out the tailshaft, you either have a leaky seal . . . or, you don't have a driveshaft yoke installed.

A completely dry 700r4 normally takes about 11 quarts, depending on whether or not you have a cooler.

I pulled this from the 4th Gear Inc. website.

The total fluid capacity is approximately 11.5 quarts depending on cooler sizes. The filler tube and dipstick provided will give you an accurate fluid level reading. Put no less than 4 quarts of fluid in the transmission BEFORE starting the engine. Upon start-up immediately add the rest of the fluid (with one already in the converter add 6 more quarts). A FINAL fluid check should take place only after the transmission has been cycled through all four speeds several times and is at operating temperature.

Henry, it is a brand new tranny never even cranked up the crate engine. I bought it 15 months ago and I wouldn't think the rear seal would be dried up.

Mine did the same thing. After I installed it, in the chassis, it sat for a couple of years before I completed and drove my 34. The seal lasted for about 20 miles. Sometimes seals are just bad.

I had an old Plymouth loose a seal years ago. I had to tow it to an autotranny shop to have it replaced. Is it that big a job to replace or can I do it here in my garage?

No big deal- Pop it out and tap in a new 1- Top off tranny.
Done deal

My 700r4 leaked, It was leaking out of the yoke. there is a steel plug that
looks like a frost plug I replaced the yoke and my leak went away!
Mine only leaked after sitting for acouple days,No leak if I drove it everyday.

Randy,

You reminded me of something.

If you use a yoke that wasn't originally for a 700R4, the weep hole in the yoke needs to be welded shut or plugged.

My driveline shop forgot to do that, and I had have them weld it up before I left the shop.

Ah yes---Forgot about that 1 myself.
Been there done that 1 B4

I was not aware that there were weep holes in the yokes, I'll have to look at some of my old driveshafts tomorrow.

Seals are funny, sometimes if a car sits for a while they will begin to seep oil, but after you put a few miles on the car they will seal up. My Jeep was that way, a puddle would form under it if it sat for a couple of months, but as soon as I used it for a day it would stop leaking.

Someone suggested one time that their car wasn't leaking oil............it was "marking it's territory."

Don

700R4 yokes don't have weep holes. However, some TH350 yokes are interchangeable with 700R4 output shafts, and they do have a weep hole. Most driveshaft shops keep one universal yoke for both transmissions.