Have a terrible tranny fluid leak ?'sss - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*low&slow* · 12-21-2010, 10:51 PM

I have a 1994 blazer with a vortec v6 and it runs good but the transmission leaks really really bad. it leaks all out right between where the motor and tranny connects.

What's the problem?

And how do you fix it?

need answer's asap as its a daily driver. needs fixed by friday

1968SWBBigBlock · 12-21-2010, 11:03 PM

I would guess a front pump seal at worst - might get lucky and its the dipstick
I would tell you to pull it and inspect it
It needs pulled if it is the front pump seal

**FRENCHBLUE72** · 12-21-2010, 11:14 PM

Sounds like a front seal to me pretty easy job to do in an afternoon..

*low&slow* · 12-21-2010, 11:15 PM

I've had a lot of people tell me its the seal but they also say its a really hard job to fix. what does it consist of to fix the seal?

ofnaman · 12-22-2010, 02:37 AM

You have to remove the engine, or transmission (easier than the engine) to gain access to a front pump seal. If your not certain where it is coming from it may be worth taking to a repair shop and paying a little bit to have them diagnose where the leak is coming from, if it's leaking as bad as you say it is it should be pretty easy to spot the leak.

*low&slow* · 12-22-2010, 03:45 AM

I know for sure where the leak is coming from. but thanks. going to fix it tomorrow. thanks guys

Jacfourteen · 12-22-2010, 06:13 AM

I agree, front seal is bad.

Tink · 12-22-2010, 09:08 AM

Quote:

Originally Posted by FRENCHBLUE72

Sounds like a front seal to me pretty easy job to do in an afternoon..

On a gen 1 S10 Blazer??? On the gen 1s with the 4.3L, you can't get to the top transmission to block bolts unless you disconnect the motor mounts and jack up the body. .

spudz · 12-22-2010, 12:58 PM

Front seal, but what made it go bad?? The bushing is probably worn out in the front pump. I ALWAYS put a new bushing in the pump if I am going threw the trouble of pulling the trans to replace a seal. I do this for a living and it costs me money to repeat the job so I always try to do it right the first time.

gchemist · 12-26-2010, 12:54 AM

4l60e's are notorious for a brass bushing leaking. It's probably not the seal. I've seen plenty of brass bushings fail. You can replace the bushing yourself.

bighaas79 · 02-24-2011, 08:58 PM

Quote:

Originally Posted by Tink

On a gen 1 S10 Blazer??? On the gen 1s with the 4.3L, you can't get to the top transmission to block bolts unless you disconnect the motor mounts and jack up the body. .

If you have to jack the body of the frame you aren't doing something right. I've done trannies in alot of these and have never once had to jack the body off the frame, or unhook the motor mounts. If you have access to a hoist and the right equipment this can be like a 2 1/2 hour job, but if you don't and don't know what you are doing u r looking at 6-8 hours. Maybe more.

68C15 · 02-25-2011, 07:37 AM

keep in mind the pump to case Oring could be leaking. or the snout of the converter is worn. either way removal for closer inspection is in order

Tink · 02-25-2011, 03:52 PM

From my years on the S10 forums, lifting the body to remove the transmission isn't all that uncommon... it is either lift the body or remove the exhaust and transmission crossmember. The trouble with removing the exhaust is the y-pipe bolts attached to the exhaust manifold freeze/rust in place.

12-21-2010, 10:51 PM	#1
low&slow Account Suspended Join Date: Jan 2009 Location: Kuna, Idaho Posts: 1,046	Have a terrible tranny fluid leak ?'sss I have a 1994 blazer with a vortec v6 and it runs good but the transmission leaks really really bad. it leaks all out right between where the motor and tranny connects. What's the problem? And how do you fix it? need answer's asap as its a daily driver. needs fixed by friday

12-21-2010, 11:03 PM	#2
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Have a terrible tranny fluid leak ?'sss I would guess a front pump seal at worst - might get lucky and its the dipstick I would tell you to pull it and inspect it It needs pulled if it is the front pump seal __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree

12-21-2010, 11:14 PM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,590	Re: Have a terrible tranny fluid leak ?'sss Sounds like a front seal to me pretty easy job to do in an afternoon.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

12-21-2010, 11:15 PM	#4
low&slow Account Suspended Join Date: Jan 2009 Location: Kuna, Idaho Posts: 1,046	Re: Have a terrible tranny fluid leak ?'sss I've had a lot of people tell me its the seal but they also say its a really hard job to fix. what does it consist of to fix the seal?

12-22-2010, 02:37 AM	#5
ofnaman Registered User Join Date: Aug 2007 Location: reno Posts: 397	Re: Have a terrible tranny fluid leak ?'sss You have to remove the engine, or transmission (easier than the engine) to gain access to a front pump seal. If your not certain where it is coming from it may be worth taking to a repair shop and paying a little bit to have them diagnose where the leak is coming from, if it's leaking as bad as you say it is it should be pretty easy to spot the leak. __________________ A sweet 2000 Deville.....

12-22-2010, 03:45 AM	#6
low&slow Account Suspended Join Date: Jan 2009 Location: Kuna, Idaho Posts: 1,046	Re: Have a terrible tranny fluid leak ?'sss I know for sure where the leak is coming from. but thanks. going to fix it tomorrow. thanks guys

12-22-2010, 06:13 AM	#7
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Have a terrible tranny fluid leak ?'sss I agree, front seal is bad. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's

12-22-2010, 12:58 PM	#9
spudz Registered User Join Date: Oct 2005 Location: Branchville SC Posts: 1,647	Re: Have a terrible tranny fluid leak ?'sss Front seal, but what made it go bad?? The bushing is probably worn out in the front pump. I ALWAYS put a new bushing in the pump if I am going threw the trouble of pulling the trans to replace a seal. I do this for a living and it costs me money to repeat the job so I always try to do it right the first time. __________________ 2004 z71, 96 z71 on 38s, 88 Chevy k5 blazer, 4in lift. 84 swb project, 82 SWB project , 84 chevy 4x4 lwb project, 88 Jimmy beater/highschool ride. 79 c30. 99 tahoe 4x4 project. and a bunch of parts trucks..

12-26-2010, 12:54 AM	#10
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Have a terrible tranny fluid leak ?'sss 4l60e's are notorious for a brass bushing leaking. It's probably not the seal. I've seen plenty of brass bushings fail. You can replace the bushing yourself. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

02-25-2011, 07:37 AM	#12
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: Have a terrible tranny fluid leak ?'sss keep in mind the pump to case Oring could be leaking. or the snout of the converter is worn. either way removal for closer inspection is in order

02-25-2011, 03:52 PM	#13
Tink Registered User Join Date: May 2002 Location: VA Posts: 1,337	Re: Have a terrible tranny fluid leak ?'sss From my years on the S10 forums, lifting the body to remove the transmission isn't all that uncommon... it is either lift the body or remove the exhaust and transmission crossmember. The trouble with removing the exhaust is the y-pipe bolts attached to the exhaust manifold freeze/rust in place. __________________ 69 Chevy C10 88 Sierra 02 2500 Suburban And too many S10s to list!



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