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#259201 - 04/26/10 09:40 PM Badly leaking 700R4 tranny- HELP !!
Stroker-383 Offline
Junior Member

Registered: 10/21/09
Posts: 42
Loc: Overijssel, The Netherlands
Hi all,

Have got some bad news, was driving my 1972 monte carlo yesterday ( sunday ), and suddenly my tranny starts leaking badly !!

I stopped immediatly and checked the underside of the car. It leaked pretty heavy ... but i'm not sure where the transmission fluid is leaking from .... I think it leaks between the torque converter and tranny.... so i was thinking :
- Leaking tranny seal...
- Leaking torque converter ;(

I will disassemble the tranny this week to check everything... Hoping to find something that is wrong. (thats leaking )

Hoping to find some information about checking the gears properly and checking the fluid... Also i noticed my dip-stick to check the transmission fluid is a bit loose... so that needs to be fixed as well... ( thinking of the fact that the dip stick is leaking ... that can be the problem... But then it wouldnt leak so badly, would it? )

I will update here as soon as I've got news.

Wish me the best;)
_________________________
There's just no substitute for cubic inches.
*Project 383 stroker*
"She's faster then a cheetah on cocaine!"

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#259213 - 04/26/10 10:17 PM Re: Badly leaking 700R4 tranny- HELP !! [Re: Stroker-383]
72MC Offline
Gold Member

Registered: 11/21/02
Posts: 2415
Loc: MARSHALL, VA

I guess the biggest question I have is where is most of the evidence of new fluid showing up? Is it at the dipstick tube, the front pump, the pan edge, etc, etc? If I hear you correctly and it is dumping out, either the pan come lose or something broke structurally(ie., case, pump, convertor, input or output line, etc). I guess what I am saying is your definition of "leaking badly" is relative. Any pics?? - Dave
_________________________


1972 Monte Carlo 383 w/4L80 full manl & posi 4.10 gears-SOLD
1972 El Camino Custom 402 w/th350 & posi 3.31 gears
1996 Impala SS-SOLD
2013 Camaro 2SS/RS L99--Heritage--Chevy still the BEST

If Guns Kill People then Cars Drive Drunk

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#259230 - 04/26/10 11:05 PM Re: Badly leaking 700R4 tranny- HELP !! [Re: 72MC]
7tonemonte Online   happy
Its Sooooo GREEN!! FGMCC Treasurer
Double Diamond Member

Registered: 04/15/05
Posts: 14095
Loc: Chester County Pa.
It depends on how badly I guess, If its pouring out while its running from about the location your saying, Converter, a little less badly,maybe the front seal?
Either way, sounds like you will be pulling a tranny, best of luck with it
_________________________
Green Tony!


Ill paint your toenails if you can stand still long enough

Click here to see my Monte build so far

---RIP Robyn Lance---

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#259236 - 04/26/10 11:15 PM Re: Badly leaking 700R4 tranny- HELP !! [Re: 7tonemonte]
502ci Offline
MODERATOR in the 11's
Double Diamond Member

Registered: 12/26/05
Posts: 14164
Loc: Richfield, Ohio
Quote:
Also i noticed my dip-stick to check the transmission fluid is a bit loose... so that needs to be fixed as well... ( thinking of the fact that the dip stick is leaking ... that can be the problem... But then it wouldnt leak so badly, would it? )

Sure it would if it's not seated properly...I'm hoping that's your problem so it will be an easy fix.
_________________________
Bill

Molôn Labe

11.80's at 114 mph, 0-60 in 3.34 sec.____
Click here to see my never ending project
__________Click here to hear it__________
____________RIP Robyn Lance___________

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#259441 - 04/27/10 10:37 PM Re: Badly leaking 700R4 tranny- HELP !! [Re: 502ci]
Stroker-383 Offline
Junior Member

Registered: 10/21/09
Posts: 42
Loc: Overijssel, The Netherlands
Well, I've checked some things today .. While my brother was starting the car, i was checking the tranny etc.

When a gear is selected , ( Drive ), it leaks after about 2 seconds, between the torque converter en tranny.... So i pulled away the tranny and torque converter today ... but how can you see or suspect a broken torque converter or tranny...

The tranny was shifting as lightly as ever , so i dont think thats the problem. Also when i pulled away the tranny from the torque converter ( when the torque convert. was still attached to the startergear) It leaked oil immediatly, and heavy.
After pulling away the tranny and torque converter, i inspected the tranny.. I put it on the ground , facing the oil pan to the floor, and pushed the attachment side ( from tranny to engine ) , downwords , to check if the tranny is leaking ... this wasn't the issue so i'm thinking the torque converter is the problem.. How can i check the Torque converter?

pics coming soon
_________________________
There's just no substitute for cubic inches.
*Project 383 stroker*
"She's faster then a cheetah on cocaine!"

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#259474 - 04/28/10 12:30 AM Re: Badly leaking 700R4 tranny- HELP !! [Re: Stroker-383]
7tonemonte Online   happy
Its Sooooo GREEN!! FGMCC Treasurer
Double Diamond Member

Registered: 04/15/05
Posts: 14095
Loc: Chester County Pa.
I had one that was split in my old truck,I think the shop said it was a factory weld, under warranty so it didnt matter to me.
I dont know how to check them, I guess they pressurize it and look for leaks
_________________________
Green Tony!


Ill paint your toenails if you can stand still long enough

Click here to see my Monte build so far

---RIP Robyn Lance---

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#259506 - 04/28/10 02:30 AM Re: Badly leaking 700R4 tranny- HELP !! [Re: 7tonemonte]
Grease Offline

Gold Member

Registered: 10/18/00
Posts: 2333
Loc: SanAntonio Fl
The 700 has a bad tendancy to pop the front seal out . So bad in fact the factory makes a seal retainer . The retainer was there fix for the problem . When a 700 family trans is out and apart its common to drill the oil drain hole to a larger size . Sorry I dont have my nots handy just now or I could tell you the drain hole size recommended and the retainer part # . i can try to look them up tomooorow .

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#259702 - 04/28/10 11:00 PM Re: Badly leaking 700R4 tranny- HELP !! [Re: Grease]
Stroker-383 Offline
Junior Member

Registered: 10/21/09
Posts: 42
Loc: Overijssel, The Netherlands
I'm trying to replace the front seal of the tranny first... see if this will solve the problem...

@ grease : Thanks , that would be great!
_________________________
There's just no substitute for cubic inches.
*Project 383 stroker*
"She's faster then a cheetah on cocaine!"

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#259714 - 04/28/10 11:55 PM Re: Badly leaking 700R4 tranny- HELP !! [Re: Stroker-383]
stangeba Offline
Original Owner
Platinum Member

Registered: 02/26/02
Posts: 3318
Loc: Shelby Township, Michigan
Check for a hole or crack in the converter. That's where my leak was albeit a TH350.
Good Luck,
Bruce
_________________________

Original Owner since May 14 1971

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#259721 - 04/29/10 12:18 AM Re: Badly leaking 700R4 tranny- HELP !! [Re: stangeba]
Grease Offline

Gold Member

Registered: 10/18/00
Posts: 2333
Loc: SanAntonio Fl
Stroker ,if I read my old reciepts correctly the GM part # for the front seal retainer is # 8654491 group # looks like 4.226 . I also use TRANSTAR parts and there part# is 61991 ,which you might be able to purchase at a local tranny shop if you dont have a GM dealer handy .

As to drilling the front seal oil drainback it can ONLY be done with tranny OUT and the PUMP TAKEN APART . In that case it would be drilled .281-.313 (9/32 - 5/16 )

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