TH350 Problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

semperfidoordie · 04-23-2007, 02:10 PM

I have a 72 C-10 Longbed 4x4 with a 350 and a TH350. I was wondering if the tranny is completely useless because when you drive it you have to drive in first till about 20 shift to seond till 30-35 then up to Drive for the rest. Haven't got her to highway speeds still have to get her legal. Was wondering if the tranny is junk or if I should have it rebuilt? any thoughts or help would be appreciated

Tony

71chevylowrider · 04-23-2007, 02:26 PM

You mean your having to shift it manually? It won't shift manually until you reach those speeds? Or it won't shift on it's own until you get to those speeds, if thats the case, I'd do a flush & filter first, maybe it's just needing a little love.

semperfidoordie · 04-23-2007, 02:37 PM

No it won't shift at all...still need to get a tach but I actually have to shift it manually

71chevylowrider · 04-23-2007, 02:45 PM

Oh, that sounds worse, has it been sitting for awhile? any chance the governor is stuck & not allowing the springs to push out? It's easy to remove & inspect, I'm no tranny expert, just familiar with them a little.

Longhorn Man · 04-23-2007, 02:47 PM

check the vac line going to the modulator on the passenger side of the tranny. Mine is liek that right now too... for the past 5 or 6 days... just been too lazy to crawl under and plug it back in.

71chevylowrider · 04-23-2007, 02:51 PM

Do what LongHorn man says, he knows his stuff!

71chevylowrider · 04-23-2007, 02:52 PM

here's a picture to help you find it.

http://www.dragracingonline.com/tech...vi_9-bm-1.html

71chevylowrider · 04-23-2007, 02:55 PM

Need to find the vacuume line to the transmission? Look at these pictures.

http://67-72chevytrucks.com/vboard/s...d.php?t=141166

semperfidoordie · 04-23-2007, 02:51 PM

Quote:

Originally Posted by Longhorn Man

check the vac line going to the modulator on the passenger side of the tranny. Mine is liek that right now too... for the past 5 or 6 days... just been too lazy to crawl under and plug it back in.

so just climb under and look at the passenger side and there will be a place for the vac line to go?

semperfidoordie · 04-23-2007, 02:49 PM

Yeah it's sat for over a year that I know of..just bought it off a guy for $300 so i'm not complaining haha not to sound like a dummy but it's my first project so a lot of this is new to me...how do I look and see if the governor is stuck?

BrentRS1985 · 04-23-2007, 04:52 PM

Quote:

Originally Posted by semperfidoordie

Yeah it's sat for over a year that I know of..just bought it off a guy for $300 so i'm not complaining haha not to sound like a dummy but it's my first project so a lot of this is new to me...how do I look and see if the governor is stuck?

$300!?! No offense but you got ripped off, unless its a TCI or B&M that sat for a year. I bought my th350 rebuilt with a shift kit and heavy duty sprag from a local tranny shop for $350.

semperfidoordie · 04-23-2007, 03:10 PM

nice thank you guys very much soon as I get off work I'll look and try and find it

71chevylowrider · 04-23-2007, 03:14 PM

Glad we could help, so? next time one of us is down your way......beers?

DangerBoy · 04-23-2007, 03:30 PM

Yeah that same thing happened to me, if you can get your hands on a piece of steel brake line long enough you can bend it to the shape you need and connect it at both ends with vaccuum line and use some hose clamps to hold it. No more cracks in the line and it wont slip off. If I can I'll try to get some pics of it.

akjarhead · 04-23-2007, 03:31 PM

anytime..make it down to San Diego while I'm still in the Marines and heck yeah...or when I get out either VA, AK, TN or KY and yeah haven't decided where I'm moving to after I get out haha that's why I listed all those places

semperfidoordie · 04-23-2007, 03:49 PM

sorry akjarhead is my old account haha..thought i'd locked myself out..apparently it worked or something haha

71chevylowrider · 04-23-2007, 03:56 PM

cool man, be safe out there & thanks for keeping our country safe!

Chevyholic · 04-23-2007, 03:53 PM

Had the same problem with mine and it is in the process of being rebuilt right now. Pick it up tomorrow. The forward gears were fried. Had been sitting a long time, so I flushed it and found quite a bit of sludge in the pan. Degraded pretty fast once it started slipping. Good luck!!

semperfidoordie · 04-23-2007, 04:50 PM

anytime thanks man...I am gonna look at the vac line..then try flushing it...still have a gut feeling i'm going to have to have it rebuilt tho

Longhorn Man · 04-23-2007, 05:02 PM

I think he ment 300 for the truck

BrentRS1985 · 04-23-2007, 05:20 PM

Quote:

Originally Posted by Longhorn Man

I think he ment 300 for the truck

oh, yeah, duhh

semperfidoordie · 04-23-2007, 06:45 PM

haha yeah I got the truck and all..running with a f'd up tranny for 300..so overall I think not a bad deal but as with all restos and projects they are a money pit but in the end it'll be all worth it..get my next Iraq deployment out of the way be coming back with like 15 grand...should be able to fix her up nice

04-23-2007, 02:10 PM	#1
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	TH350 Problems I have a 72 C-10 Longbed 4x4 with a 350 and a TH350. I was wondering if the tranny is completely useless because when you drive it you have to drive in first till about 20 shift to seond till 30-35 then up to Drive for the rest. Haven't got her to highway speeds still have to get her legal. Was wondering if the tranny is junk or if I should have it rebuilt? any thoughts or help would be appreciated Tony

04-23-2007, 02:26 PM	#2
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems You mean your having to shift it manually? It won't shift manually until you reach those speeds? Or it won't shift on it's own until you get to those speeds, if thats the case, I'd do a flush & filter first, maybe it's just needing a little love.

04-23-2007, 02:37 PM	#3
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: TH350 Problems No it won't shift at all...still need to get a tach but I actually have to shift it manually

04-23-2007, 02:45 PM	#4
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems Oh, that sounds worse, has it been sitting for awhile? any chance the governor is stuck & not allowing the springs to push out? It's easy to remove & inspect, I'm no tranny expert, just familiar with them a little.

04-23-2007, 02:47 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH350 Problems check the vac line going to the modulator on the passenger side of the tranny. Mine is liek that right now too... for the past 5 or 6 days... just been too lazy to crawl under and plug it back in.

04-23-2007, 02:51 PM	#6
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems Do what LongHorn man says, he knows his stuff!

04-23-2007, 02:52 PM	#7
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems here's a picture to help you find it. http://www.dragracingonline.com/tech...vi_9-bm-1.html

04-23-2007, 02:55 PM	#8
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems Need to find the vacuume line to the transmission? Look at these pictures. http://67-72chevytrucks.com/vboard/s...d.php?t=141166 Last edited by 71chevylowrider; 04-23-2007 at 03:54 PM.

04-23-2007, 02:49 PM	#10
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: TH350 Problems Yeah it's sat for over a year that I know of..just bought it off a guy for $300 so i'm not complaining haha not to sound like a dummy but it's my first project so a lot of this is new to me...how do I look and see if the governor is stuck?

04-23-2007, 03:10 PM	#12
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: TH350 Problems nice thank you guys very much soon as I get off work I'll look and try and find it

04-23-2007, 03:14 PM	#13
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems Glad we could help, so? next time one of us is down your way......beers?

04-23-2007, 03:30 PM	#14
DangerBoy Registered User Join Date: Nov 2005 Location: Springville, Ca Posts: 270	Re: TH350 Problems Yeah that same thing happened to me, if you can get your hands on a piece of steel brake line long enough you can bend it to the shape you need and connect it at both ends with vaccuum line and use some hose clamps to hold it. No more cracks in the line and it wont slip off. If I can I'll try to get some pics of it. __________________ 2002 S10 ZR2 for the dirt. 1968 C10 shorty for the street. She said the truck would be the end of us. I still have the truck!

04-23-2007, 03:31 PM	#15
akjarhead Registered User Join Date: Feb 2006 Location: San Diego, CA Posts: 38	Re: TH350 Problems anytime..make it down to San Diego while I'm still in the Marines and heck yeah...or when I get out either VA, AK, TN or KY and yeah haven't decided where I'm moving to after I get out haha that's why I listed all those places __________________ "Some People Spend An Entire Lifetime Wondering If They Made A Difference Marines Don't Have That Problem" President Ronald Reagan in 1985.

04-23-2007, 03:49 PM	#16
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: TH350 Problems sorry akjarhead is my old account haha..thought i'd locked myself out..apparently it worked or something haha

04-23-2007, 03:56 PM	#17
71chevylowrider Senior Member Join Date: Sep 2006 Location: Vancouver, WA Posts: 1,015	Re: TH350 Problems cool man, be safe out there & thanks for keeping our country safe!



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04-23-2007, 03:53 PM	#18
Chevyholic Will it run today? Join Date: Feb 2007 Location: DFW, Texas Posts: 272	Re: TH350 Problems Had the same problem with mine and it is in the process of being rebuilt right now. Pick it up tomorrow. The forward gears were fried. Had been sitting a long time, so I flushed it and found quite a bit of sludge in the pan. Degraded pretty fast once it started slipping. Good luck!! __________________ Jaws, the 1971 Chevy Cheyenne Longbed. She's big, grey, and has an insatiable appetite! Last edited by Chevyholic; 04-23-2007 at 03:53 PM. Reason: Illiteracy

04-23-2007, 04:50 PM	#19
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: TH350 Problems anytime thanks man...I am gonna look at the vac line..then try flushing it...still have a gut feeling i'm going to have to have it rebuilt tho

04-23-2007, 05:02 PM	#20
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH350 Problems I think he ment 300 for the truck

04-23-2007, 06:45 PM	#22
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: TH350 Problems haha yeah I got the truck and all..running with a f'd up tranny for 300..so overall I think not a bad deal but as with all restos and projects they are a money pit but in the end it'll be all worth it..get my next Iraq deployment out of the way be coming back with like 15 grand...should be able to fix her up nice

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