th 350 stoped workin - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pitt · 01-31-2009, 06:50 PM

i need some help with my trans it was workin fine the other day and ow will not go into gear at all... it literally does nothing. the shift linkage is fine and the trans fluid is full and red so im pretty sure i didnt fry it. only clue i have is theres no fluid pressure at my trans cooler ot even a drip with the engine running..

68gmsee · 02-01-2009, 10:53 AM

I'm not a transmission person but here's a bump for you.

All I've done is replace fluid and filters. Many years ago I did fix the only problem I've had with a 350. It was the vacuum modulator gone bad.

My brother had a problem with his where the flywheel/flex plate broke. He was able to hear the noise when it happened.

Were there any stange noises? You may have to drop the bottom pan to see if the filter is restricting the flow or maybe see some metallic parts in the pan bottom...

Good luck.

Longhorn Man · 02-01-2009, 10:58 AM

All you can check (as far as I know) is make sure the converter is bolted to the flex plate & make sure the flex plate isn't shattered. After that, you are looking at dropping the tranny and having it rebuilt/replaced.
No fluid flow is the key, your pump isn't pumping.

**clay68c10** · 02-01-2009, 12:17 PM

Yep, sounds like a bad front pump. That should be relatively cheap to fix.

stllookn · 02-01-2009, 01:12 PM

If you have not replaced the filter...I would drop the pan and check that. I have had them so clogged that it would take about 10 minutes before they developed enough pressure to even move!!!! Made for a scary moment when I accidently left it in gear in the shop and went to get a tool...turned back to see it creep forward into the bench and put a nice crease in the hood...OUCH!!! The really scary thing was I had just walked between the truck and bench...nice wake-up moment!

pitt · 02-01-2009, 04:30 PM

ok thanx guys ill be pulling it apart then to get that front pump... makes the most sense cause i had a tci shift kit put in it by a ''professional'' it drove around the yard a few times then i came back to work on it some more a few days later and it wouldnt go into gear...what really irked me i i had just gotten my engine to run right and i really wanted to drive it...oh well back to the shop

pitt · 02-01-2009, 04:37 PM

oOo that could have ended badly...

Longhorn Man · 02-01-2009, 11:21 PM

you didn't mention the recent work.
i would drop the pan and see if the filter (which doubles as a pickup) is still secured to the valve body.
The pump may still be bad, but I would start there.

01-31-2009, 06:50 PM	#1
pitt 69 GMC of DOOM Join Date: Aug 2007 Location: herington, KS Posts: 62	th 350 stoped workin i need some help with my trans it was workin fine the other day and ow will not go into gear at all... it literally does nothing. the shift linkage is fine and the trans fluid is full and red so im pretty sure i didnt fry it. only clue i have is theres no fluid pressure at my trans cooler ot even a drip with the engine running..

02-01-2009, 10:53 AM	#2
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: th 350 stoped workin I'm not a transmission person but here's a bump for you. All I've done is replace fluid and filters. Many years ago I did fix the only problem I've had with a 350. It was the vacuum modulator gone bad. My brother had a problem with his where the flywheel/flex plate broke. He was able to hear the noise when it happened. Were there any stange noises? You may have to drop the bottom pan to see if the filter is restricting the flow or maybe see some metallic parts in the pan bottom... Good luck. Last edited by 68gmsee; 02-01-2009 at 10:54 AM.

02-01-2009, 10:58 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: th 350 stoped workin All you can check (as far as I know) is make sure the converter is bolted to the flex plate & make sure the flex plate isn't shattered. After that, you are looking at dropping the tranny and having it rebuilt/replaced. No fluid flow is the key, your pump isn't pumping.

02-01-2009, 12:17 PM	#4
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,946	Re: th 350 stoped workin Yep, sounds like a bad front pump. That should be relatively cheap to fix. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

02-01-2009, 01:12 PM	#5
stllookn Saving 1 truck at a time! Join Date: Aug 2001 Location: Kent, WA Posts: 6,465	Re: th 350 stoped workin If you have not replaced the filter...I would drop the pan and check that. I have had them so clogged that it would take about 10 minutes before they developed enough pressure to even move!!!! Made for a scary moment when I accidently left it in gear in the shop and went to get a tool...turned back to see it creep forward into the bench and put a nice crease in the hood...OUCH!!! The really scary thing was I had just walked between the truck and bench...nice wake-up moment! __________________ '68 C20 Longhorn 50th Anniversary 400/TH400 '68 C20 Longhorn 50th Anniversary 468/TH400w/buckets '72 C20 Halfhorn (Longhorn w/o cab and front clip) '69 Flxible Cruiser (look up ugly in the dictionary)

02-01-2009, 04:30 PM	#6
pitt 69 GMC of DOOM Join Date: Aug 2007 Location: herington, KS Posts: 62	Re: th 350 stoped workin ok thanx guys ill be pulling it apart then to get that front pump... makes the most sense cause i had a tci shift kit put in it by a ''professional'' it drove around the yard a few times then i came back to work on it some more a few days later and it wouldnt go into gear...what really irked me i i had just gotten my engine to run right and i really wanted to drive it...oh well back to the shop

02-01-2009, 04:37 PM	#7
pitt 69 GMC of DOOM Join Date: Aug 2007 Location: herington, KS Posts: 62	Re: th 350 stoped workin oOo that could have ended badly...

02-01-2009, 11:21 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: th 350 stoped workin you didn't mention the recent work. i would drop the pan and see if the filter (which doubles as a pickup) is still secured to the valve body. The pump may still be bad, but I would start there.

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