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#1 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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TH350 mysterious shifting/not going into gear/freespin issue
i have a TH350 in my 67' 4x4 and i got a problem you guys might be able to help me with.. i did a fluid and filter change due to a leaky pan gasket, fluid was a little dirty nothing to be alarmed with, i get it back together, fluid levels checked, go for a test drive, it drives 100 yards and then freespins. doesn't do anything in any gear, turn it off let it sit for a min, goes back to normal operation, then, it does it again, no power... this keeps going on and is undriveable...
me and my buddy took a look at the trans lines to the cooler and the return was cold the other was warm, we took the trans lines off and made a short loop back to itself, no results.. i have a felling its some sort of a clog, but i have no idea where to start, short of tearing the trans down and all that, in which case i'd get a 400.. so any tips would be greatly appreciated.. great board! thanks! Joe |
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#2 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
|
TH350 mysterious shifting/not going into gear/freespin issue
i have a TH350 in my 67' 4x4 and i got a problem you guys might be able to help me with.. i did a fluid and filter change due to a leaky pan gasket, fluid was a little dirty nothing to be alarmed with, i get it back together, fluid levels checked, go for a test drive, it drives 100 yards and then freespins. doesn't do anything in any gear, turn it off let it sit for a min, goes back to normal operation, then, it does it again, no power... this keeps going on and is undriveable...
i checked the fluid level after shifting through each gear, while it was on, etc... me and my buddy took a look at the trans lines to the cooler and the return was cold the other was warm, we took the trans lines off and made a short loop back to itself, no results.. i have a felling its some sort of a clog, but i have no idea where to start, short of tearing the trans down and all that, in which case i'd get a 400.. so any tips would be greatly appreciated.. great board! thanks! Joe Last edited by sommsdrumz; 04-14-2008 at 11:36 PM. |
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#3 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Are you sure the fluid level is proper after warm up and being run through the gears?
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#4 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
definetly.
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Not knowing your mechanical level are you checking the tranny fluid with the engine running after going through all the gears, or with the engine off?
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#6 |
STOLEN
![]() Join Date: Jun 2006
Location: Orange County
Posts: 1,022
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Is it possible the transfer case is slippin out?
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#7 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
longhorn: engine on, going through each gear, waiting, etc..
this hasnt been a one shot deal, its pretty consistent, it works when its cold, but as soon as it warms up, it acts like its in neutral, then, from time to time, fairly consistently, when you shut it off and wait a few mins, it will work again, but it works the longest from a cold start. the fluid in the t-case is fresh and new, it has been rebuilt less than 2k miles ago.. Last edited by sommsdrumz; 04-14-2008 at 11:28 PM. |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: TH350 mysterious shifting/not going into gear/freespin issue
ok, I didn't want to sound like I was insulting you (sounds like you weren't) but i see sooooo many people not doing it right.
this IS an odd one... no clue though. |
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#9 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
hey no problem, getting everyone on the same age is paramount. and yes, its very strange, and reaaaal annoying, when it works, it locks in and its as strong as it was before this happened, but when it doesn't, its a very good neutral..
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#10 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: TH350 mysterious shifting/not going into gear/freespin issue
The filter that was in there, was it the screen type or the "filter" type filter, kind of a paper type of filter ? And what type was the replacement ? The "filter" type could plug fairly fast if there was some trash in the oil. Do you notice any pump whine when this happens ? That would be a sign of a plugged filter, or it sucking air somewhere.
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 04-14-2008 at 11:56 PM. |
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#11 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Did this happen before the fluid change? Is it the correct dipstick? It sure sounds like a low fluid problem to me.
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#12 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
screen type filter replaced by screen type filter, no whine that i know of, although when we replaced the filter (which had been replaced about 2k miles before) we noticed there was a tear in the screen about 1/2 inch long.
Last edited by sommsdrumz; 04-15-2008 at 12:11 AM. |
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#13 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
this never happened before the fluid change, and we replaced the dipstick made for the th350 old one was broken.
Last edited by sommsdrumz; 04-15-2008 at 12:13 AM. |
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#14 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Maybe add 1 more quart just to make sure it isn't low ?
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#15 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: TH350 mysterious shifting/not going into gear/freespin issue
When did you replace the dipstick ? And I just noticed you are posting here as well as in engine and drivetrain - double posting is frowned upon !!!
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#16 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
when we replaced the fluid we replaced the dipstick, sorry about the double post, didn't know which one was best.
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#17 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: TH350 mysterious shifting/not going into gear/freespin issue
do you have the old broken dipstick?
How many pints went into it after the filter chainge? I agree it sounds like the pan is getting sucked dry |
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#18 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
i threw away the old dipstick, we put in some 4-5-6 quarts
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#19 |
Senior Member
![]() Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,873
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Drop the pan and check ALL of the tubes.They wiggle loose.They are just easy press fits I think (It's been a LONG time).
Warning; DO NOT continue running this trans in this condition or it will be totally trashed if it isn't already. Check that the pick-up and everything else is real tight.
__________________
'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme. |
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#20 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Please post your question in only one place. Everyone has to agree to the same rules when they enroll, but most apparently skip over them. They are a sticky at the top of most pages.
Copied directly from the rules.... Quote:
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#21 |
Registered User
Join Date: May 2007
Location: Tacoma, WA
Posts: 20
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Re: TH350 mysterious shifting/not going into gear/freespin issue
thanks longhair, i appologize, again, for my double post.
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#22 |
Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 865
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Drop the pan and check the seal on the filter. If there is no seal, or it is cut, it can cause a problem.
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#23 |
.....I am working on it.....
Join Date: Jul 2007
Location: Anaheim Hills, Ca
Posts: 960
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Re: TH350 mysterious shifting/not going into gear/freespin issue
I agree on the low fluid level. Add another quart to see if it improves. Did you drain the converter? If so, it will take a few quarts in addition to the rest of the tranny. If you can access the port that the dipstick uses, you can check the level there. Dont quote me, but I think the fluid should be at the top of that hole once the dipstick tube is removed from the tranny.
Last edited by sandking; 04-15-2008 at 05:25 AM. |
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#24 |
Registered User
Join Date: Apr 2006
Location: Spring, Texas
Posts: 167
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Re: TH350 mysterious shifting/not going into gear/freespin issue
Make sure your vacuum line is hooked up to the modulator. If it is not pulling vacuum it will take off and then loose power and not shift into upper gears. Other than that I would suspect fuild level
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'72 3/4 Cheyenne Super 402/TH400 Gear Vendors '72 3/4 Cheyenne Super 350/200R4 '50 1/2 Chevy 3 Window |
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#25 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: TH350 mysterious shifting/not going into gear/freespin issue
a bad modulator would prevent it from shifting, but would not keep it from moving
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