Turbo 350 dumping fluid - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ron · 08-21-2003, 12:36 AM

When I drive my 67 C-10 it never leaks tranny fluid. But when I park it for a few weeks, it dumps about 2 Qts. This seems to be a fairly common problem with 350's. What gives? Thanks

cnshoot · 08-21-2003, 12:40 AM

where is it wet at the pan or inspection cover or both and might be the speedo is on drivers side or dipstick tube there is a seal on passenger side

69c10stepside · 08-21-2003, 12:49 AM

Also, do you park it on level ground or it facing up or down?

Tx Firefighter · 08-21-2003, 08:39 AM

There is a little check valve inside that is supposed to keep the fluid in the torque converter. When the valve leaks, the converter fluid will drain back into the tranny and leak out of any place it can. That's why it only happens when it sets for awhile. If you drive it occasionally, the fluid stays pumped up into the converter.

I changed every seal in my TH350 twice, before my tranny guy explained what was happening.

08-21-2003, 12:36 AM	#1
Ron Registered User Join Date: Feb 2000 Location: Zillah Wa. USA Posts: 394	Turbo 350 dumping fluid When I drive my 67 C-10 it never leaks tranny fluid. But when I park it for a few weeks, it dumps about 2 Qts. This seems to be a fairly common problem with 350's. What gives? Thanks __________________ '69 SWB '76 International "Terra" "Hooked on holiday beer"

08-21-2003, 12:40 AM	#2
cnshoot Registered User Join Date: Jan 2003 Location: minden Posts: 358	where is it wet at the pan or inspection cover or both and might be the speedo is on drivers side or dipstick tube there is a seal on passenger side __________________ 72 cst 2wd blazer sb soon to have tilt manual 72 gmc swb fleet 2wd bb air tilt auto 93 c/3500 crew-cab dually 03 chevy suburban LT quadrasteer c/2500 4x4

08-21-2003, 12:49 AM	#3
69c10stepside Large Member Join Date: Jun 2002 Location: Northwest Arkansas Posts: 747	Also, do you park it on level ground or it facing up or down? __________________ 1989 GMC C1500 ECSB 1972 Gmc Jimmy 1972 Chevy C10 SWB Sold

08-21-2003, 08:39 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	There is a little check valve inside that is supposed to keep the fluid in the torque converter. When the valve leaks, the converter fluid will drain back into the tranny and leak out of any place it can. That's why it only happens when it sets for awhile. If you drive it occasionally, the fluid stays pumped up into the converter. I changed every seal in my TH350 twice, before my tranny guy explained what was happening. __________________ I'm on the Instagram- @Gearhead_Kevin



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.