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Another 700r4 leak

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Old 12-20-2008, 12:13 AM   #1
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Another 700r4 leak

Hello, new guy here with same old problems.

I've got an 85 camaro with a 305 and 700r4 trans that has sprung a leak. Seems to leak the most when it's parked, but I don't know for sure as I only got to drive it once before it started to leak . Anyway, from position of the puddle and wetness on trans it seems the front seel is likely my culprit. Now I have to know what's involved in changing this out. I've read several other posts and heard several people give basically the same advice, but I was wondering if anyone had a complete list of all parts required or recommended to replace when changing the seal? I'm thinking a seal, retainer, o-rings, pump bolt washers and a pan gasket and filter along with the 3-4 quarts of fluid it's leaked out all over my garage/driveway. I've heard it's a good idea to replace the pump bushing as well as it can also cause a leaky seal. Is this something I can do myself or should I take it to a shop? If I need to go to a shop, what's a fair price for having a new bushing installed and would it just be easier more cost effective to have them do the whole seal?

Finally, I'm thinking about drag racing occasionally with this car and am wondering if it's worth rebuilding the trans or just switch to a TH350/400 instead. Will the 700 hold up to drag strip running say 20-30 passes a year (strip is 75 miles away, so not going more than once a month in good weather)? will run stock motor w/ headers, duals, open element filter, and maybe a 600/650 holley or rebuilt q-jet on stock ratio open rear and 255 firestone wide-oval street tires (not nearly fast enough for slicks or power adders).
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Old 12-20-2008, 10:06 AM   #2
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Re: Another 700r4 leak

Really the only reason they almost ever leak is due to a pump bushing walking out.

You will need a pump seal, pump bushing, pump o ring, and pump gasket.

Most of the time the bushing is walking out causing this. So when you dis assemble the pump you should scribe inside the housing where the bsuhing goes to make the new bushing more secure when its hammered in.

Also disassembling and re assembling the pump requires special care to be sure its realigned properly or it wont go back into the case correctly. If you have NO transmission experience its going to be easy to get frustrated.. You MAY want to take the trans to a shop and let them reseal it for you. (let them pull the pump etc)

But i am always thinking, why not tighten the 3/4 clutch clearance up ana a fresh band while its out!?!? I could go on but as you see it never ends lol

but goodluck with your repair! I hope i can contribute here on thois board some! Now to see how i become a authorised vendor.

Shane @ CPT
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Old 12-20-2008, 03:41 PM   #3
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Car: 91camaro rs,2014 silverado 5.3L
Engine: 5.7Lcarb,5.3L
Transmission: 700-r4, 6L80
Axle/Gears: strange 3.73's

Re: Another 700r4 leak

if it was the front seal wouldnt it leak when there is pressure on it? not when it is just sitting there? if it is wet on the converter inspection cover can you see a line of fluid coming from somewhere? have you checked to see if the cooler lines are tight and that it isnt leaking from there or where the dipstick goes into the tranny? there is a seal there that sometimes leaks. if it is leaking around there check the top of the tranny pan where it meets the tranny and see if there is fluid on it. just somemore options for you to check. easier and cheaper options.
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Old 03-25-2009, 02:55 PM   #4
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Location: Peoria, IL
Posts: 990
Car: 1988 Camaro Sport Coupe
Engine: 5.0 305 Carb'd
Transmission: 700R4
Axle/Gears: 3.23

Re: Another 700r4 leak

alright im losin bout a quart every night. i pulled my car into the garage and the next morning there was around 2-3 quarts on the ground. i lifted up the driver side of the car to see if any fluid would come out, and it POURED out of my dipstick. i let the car down picked the other side up pulled the dipstick out cleaned the bottom and and the top of the tranny where the tube goes in and i put silicone on it pushed the dipstick all the way in. i tapped it with a hammer to be sure it was tight and left it alone all night. went outside the next morning and it there was about 1 quart. did the same thing after i saw that but added more silicone and tapped it in a little harder. went outside this morning and theres ANOTHER quart under the car. im gettin really pissed about this lol. anybody know anything else i can do to get this to seal?? ive already spent about 50 dollar in just fluids on this tranny over the past week. suggestions??

sorry to steal this thread... didnt wanna start another thread cause id prolly get scolded ha
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Old 03-25-2009, 05:44 PM   #5
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Join Date: Nov 2006
Location: Tx
Posts: 248
Car: 86 Camaro
Engine: 305
Transmission: 700r4
Axle/Gears: 3.73

Re: Another 700r4 leak

You need to replace the dip stick seal. Napa part # 735-5004

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