th 400 - Pirate4x4.Com : 4x4 and Off-Road Forum

rdnek8 · 11-28-2007, 03:50 PM

Changed the fluid and screen in my th400 a few weeks ago. I haven't ran it since the service. I cant remember how much fluid I put in exactly. Fluid is at the top of the hot full mark while idling. Transmission ran fine before. Now there is fluid coming out around torque convertor at high RPMS. Anyone have any suggestions to what the problem is or any solutions.

florida4x4 · 11-28-2007, 04:06 PM

front seal?

Stout Racing · 11-28-2007, 05:58 PM

sounds like a front pump bushing to me thats what happend to my 700R4 when i blew her up puked all the atf out the front ...

Backncardr · 11-28-2007, 06:07 PM

Make sure the trans breather vent is clear and not blocked.

rdnek8 · 11-28-2007, 06:28 PM

The vent tube is not blocked and is clear of any obstructions. It is not a lot of fluid just pouring out. It is a stream about the size of a pencil lead and it only happens above ~ 3500RPM. I was just wondering if this a symptom of too much fluid.

Grumpy_old_fart · 11-28-2007, 06:30 PM

seals fucked.

start there.... if you get to the seal... well, you gotta pull the converter

if you find the front seal the bad part, change it... if you pull the converter and the bushing has seized to the hub, replace the pump, because it probably wont hold a new bushing, either.

start at the seal.

Backncardr · 11-28-2007, 06:33 PM

Could be. The fluid level in the has to be even with the pan rail when full. Drop the pan and check the stick against the pan rail on the case-remark if necessary. If ok time for a new front seal and/or new pump o-ring. Be a good time to replace the pump bushing as well and check the surface of the torque convertor hub for scoring.

florida4x4 · 11-28-2007, 06:42 PM

also watch for cracks on the front of the converter. they can cause weird leaks.

11-28-2007, 03:50 PM	#1 (permalink)
rdnek8 Registered User Join Date: Feb 2006 Member # 68123 Location: Columbia,ms Posts: 25	th 400 Changed the fluid and screen in my th400 a few weeks ago. I haven't ran it since the service. I cant remember how much fluid I put in exactly. Fluid is at the top of the hot full mark while idling. Transmission ran fine before. Now there is fluid coming out around torque convertor at high RPMS. Anyone have any suggestions to what the problem is or any solutions.

11-28-2007, 04:06 PM	#2 (permalink)
florida4x4 Beaver Pleaser Join Date: Sep 2002 Member # 13645 Location: home of the wayward dirt bike Posts: 1,419 Blog Entries: 1	front seal? __________________ 1972 GMC Submarine 383 / TH350 / 203D-NP205 / D60 / 14FF / 42's on Stazworks / heavy foote / four eyez Inclined to brute force attack a 70* incline with a Quadrajet 1997 GMC K3500 Suburban 454 / 4L80E / HP60 SAS / PROJECT TOWHOE

11-28-2007, 06:07 PM	#4 (permalink)
Backncardr Granite Guru Join Date: Nov 2003 Member # 24747 Location: Woodland, CA. & Mokelumne Hill, CA. Posts: 564	Make sure the trans breather vent is clear and not blocked. __________________ See my stuff on Ebay NRA Life http://www.nra.com/ CRPA Life http://www.crpa.org/ http://www.lojack.com/ http://www.trannybuilder.com/

11-28-2007, 06:30 PM	#6 (permalink)
Grumpy_old_fart Devout Newbie Hater Join Date: Jun 2003 Member # 20147 Location: Oakland Orygun Posts: 6,457	seals fucked. start there.... if you get to the seal... well, you gotta pull the converter if you find the front seal the bad part, change it... if you pull the converter and the bushing has seized to the hub, replace the pump, because it probably wont hold a new bushing, either. start at the seal. __________________ sympathy, empathy and apathy... i dont know which one is which.... But i know you can find sympathy between shit and syphilis in the dictionary. Win this car for a whole BUCK! Last edited by Grumpy_old_fart; 11-28-2007 at 06:31 PM.

11-28-2007, 06:33 PM	#7 (permalink)
Backncardr Granite Guru Join Date: Nov 2003 Member # 24747 Location: Woodland, CA. & Mokelumne Hill, CA. Posts: 564	Could be. The fluid level in the has to be even with the pan rail when full. Drop the pan and check the stick against the pan rail on the case-remark if necessary. If ok time for a new front seal and/or new pump o-ring. Be a good time to replace the pump bushing as well and check the surface of the torque convertor hub for scoring. __________________ See my stuff on Ebay NRA Life http://www.nra.com/ CRPA Life http://www.crpa.org/ http://www.lojack.com/ http://www.trannybuilder.com/

11-28-2007, 05:58 PM	#3 (permalink)
Stout Racing Registered User Join Date: Jun 2006 Member # 73673 Location: Kelowna BC Canada Posts: 630	sounds like a front pump bushing to me thats what happend to my 700R4 when i blew her up puked all the atf out the front ...

11-28-2007, 06:28 PM	#5 (permalink)
rdnek8 Registered User Join Date: Feb 2006 Member # 68123 Location: Columbia,ms Posts: 25	The vent tube is not blocked and is clear of any obstructions. It is not a lot of fluid just pouring out. It is a stream about the size of a pencil lead and it only happens above ~ 3500RPM. I was just wondering if this a symptom of too much fluid.

11-28-2007, 06:42 PM	#8 (permalink)
florida4x4 Beaver Pleaser Join Date: Sep 2002 Member # 13645 Location: home of the wayward dirt bike Posts: 1,419 Blog Entries: 1	also watch for cracks on the front of the converter. they can cause weird leaks. __________________ 1972 GMC Submarine 383 / TH350 / 203D-NP205 / D60 / 14FF / 42's on Stazworks / heavy foote / four eyez Inclined to brute force attack a 70* incline with a Quadrajet 1997 GMC K3500 Suburban 454 / 4L80E / HP60 SAS / PROJECT TOWHOE

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