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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: junktruck on August 23, 2007, 07:47:00 AM

Title: automatic transmission problem
Post by: junktruck on August 23, 2007, 07:47:00 AM

1981 k10, 0-35 shifts in and out like its going in passing gear then when it should shift at about 40-45 it winds out and then finaly shifts but if you slow down a little it shifts in and out again, its not slipping its just shifting.  ive checked the fluid and its full and there doesnt appear to be any vacuum hoses off, any help would be appreciated,thx

Title: Re: automatic transmission problem
Post by: VileZambonie on August 23, 2007, 10:14:06 AM

What transmission do you have? So are you saying you have very late upshifts and and very early downshifts? If so check the gear on the governer valve. It's probably apple cored

Title: Re: automatic transmission problem
Post by: Lt.Del on August 23, 2007, 10:41:24 AM

Are you checking the fluid while engine is running?  I hope so.

I'd start, other that what Vile said, w/ the modulator and vacuum line to it.  It controls shift points.

Title: Re: automatic transmission problem
Post by: junktruck on August 24, 2007, 08:45:02 AM

What exactly is apple cored? Can the govenor valve be cleaned and wheres it at and how would i clean it? any help would be appreciated,thx

Title: Re: automatic transmission problem
Post by: VileZambonie on August 24, 2007, 10:06:12 AM

I'll answer your questions if you answer mine. What trans do you have?

Apple core - think of how people eat an apple

(http://coreacademy.usu.edu/04_Materials/Clip_Art/applecore.gif)

the governer cover needs to be removed and then slide the governer out.

(http://www.dragracingonline.com/technical/images/0409/gov2.jpg)

Title: Re: automatic transmission problem
Post by: VileZambonie on August 24, 2007, 10:08:37 AM

(http://www.gmccoop.com/images/Gov-gear-bad-2.jpg)

Title: Re: automatic transmission problem
Post by: junktruck on August 24, 2007, 11:06:54 AM

Im not sure what transmission it is, i have a 1981 k10 4x4 with a 305 engine but im not sure what the transmission is.Is the white piece in the picture able to be slid out after the govner cover is removed and replaced and is there something special id use to clean the area inside after the cover is removed?  thx

Title: Re: automatic transmission problem
Post by: eventhorizon66 on August 24, 2007, 12:13:57 PM

Check out the following link to help you identify your trans by the shape of the pan, but I betcha its a TH350.

Auto Trans ID (http://www.chuckschevytruckpages.com/images/transpan.jpg)

Title: Re: automatic transmission problem
Post by: junktruck on August 24, 2007, 05:31:53 PM

going by that ,i have a th350   thx

Title: Re: automatic transmission problem
Post by: junktruck on August 25, 2007, 10:18:36 AM

I got the governor out and the gear was aplle cored. What causes thei and also im having an impossible time trying to find a new governor, seems like none of the local auto parts carry it, any suggestions?  thx ahead of time

Title: Re: automatic transmission problem
Post by: VileZambonie on August 25, 2007, 10:39:42 AM

all u need is the nylon gear. Any dealer should have it in stock or a transmission parts supply house will have it.

Title: Re: automatic transmission problem
Post by: VileZambonie on August 25, 2007, 10:43:04 AM

Here ya go. It's a wapping .99 cents
http://www.transmissionpartsusa.com/TH350_transmission_governor_p/470-000047327.htm

Title: Re: automatic transmission problem
Post by: junktruck on August 25, 2007, 10:44:08 AM

Can you tell me how the nylon gear comes out of the governor, i tried to pull it out to no avail.  thx

Title: Re: automatic transmission problem
Post by: VileZambonie on August 25, 2007, 02:36:20 PM

knock the roll pin out