TH350 won't upshift - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ZMAR · 01-30-2014, 09:45 PM

I've checked the fluid while everything was hot. Good there. Pulled the governor out and shook it, plunger is working freely. Vacuum is ran and hooked to manifold not carb and free of any cracks or kinks. When you take off in drive it revs way up there and won't shift. It's like you push the clutch in and it idles back down while you are still rolling. Any ideas here fellas?

Sabaka454 · 01-30-2014, 09:55 PM

How is the gear on the governor?

ZMAR · 01-30-2014, 10:04 PM

Quote:

Originally Posted by Sabaka454

How is the gear on the governor?

Looked brand new

Sabaka454 · 01-30-2014, 10:09 PM

And you checked the drive gear as well on the output shaft? Did you verify there is vacuum with the engine running at the vacuum modulator? Is the detent cable hooked up and properly adjusted?

buddy_1 · 01-30-2014, 10:12 PM

Is it slipping or just revving high? Check the downshift cable for proper adjustment. If its too tight it will try to stay in passing gear.

ZMAR · 01-30-2014, 10:23 PM

Quote:

Originally Posted by Sabaka454

And you checked the drive gear as well on the output shaft? Did you verify there is vacuum with the engine running at the vacuum modulator? Is the detent cable hooked up and properly adjusted?

I didn't look inside the hole where the governor slides in. It did rotate when I pulled it out and it came out very smooth. So I unhook the vacuum line at the modulator w/ motor running and see if there is vacuum? I did not look at the cable but will check that right now

ZMAR · 01-30-2014, 10:28 PM

Quote:

Originally Posted by buddy_1

Is it slipping or just revving high? Check the downshift cable for proper adjustment. If its too tight it will try to stay in passing gear.

Revving high. It has a stall in it but I doubt it's 5k! I'm going to check the cable

ZMAR · 01-30-2014, 10:29 PM

What about completely unhooking the cable? What would that do? It's got 38s and super low gears

ZMAR · 01-30-2014, 10:47 PM

The cable is not too tight.

**rs74** · 01-30-2014, 10:51 PM

Quote:

Originally Posted by Sabaka454

How is the gear on the governor?

That was my thought. Had one get so hot on one side it melted it down to a smooth indentation. The rest of the gear was find except that one spot.

smashingchuck · 01-31-2014, 06:00 PM

Check for vacuum... keep the kick-down cable on there you'll want it with the 38s, regardless of your steep gears.

01-30-2014, 09:45 PM	#1
ZMAR Registered User Join Date: Aug 2012 Location: Breck, tx Posts: 147	TH350 won't upshift I've checked the fluid while everything was hot. Good there. Pulled the governor out and shook it, plunger is working freely. Vacuum is ran and hooked to manifold not carb and free of any cracks or kinks. When you take off in drive it revs way up there and won't shift. It's like you push the clutch in and it idles back down while you are still rolling. Any ideas here fellas? __________________ 71 c10 swb

01-30-2014, 09:55 PM	#2
Sabaka454 Registered User Join Date: Jul 2005 Location: CT Posts: 279	Re: TH350 won't upshift How is the gear on the governor?

01-30-2014, 10:09 PM	#4
Sabaka454 Registered User Join Date: Jul 2005 Location: CT Posts: 279	Re: TH350 won't upshift And you checked the drive gear as well on the output shaft? Did you verify there is vacuum with the engine running at the vacuum modulator? Is the detent cable hooked up and properly adjusted?

01-30-2014, 10:12 PM	#5
buddy_1 Registered User Join Date: Dec 2013 Location: Humble, Texas Posts: 185	Re: TH350 won't upshift Is it slipping or just revving high? Check the downshift cable for proper adjustment. If its too tight it will try to stay in passing gear. __________________ I know the "VOICES" aren't real but they have some great ideas. 1978 GMC Sierra Classic C25 1983 Datsun 280ZX Turbo 1997 Chevy Cheyenne K2500 1999 Polaris Sport 400

01-30-2014, 10:29 PM	#8
ZMAR Registered User Join Date: Aug 2012 Location: Breck, tx Posts: 147	Re: TH350 won't upshift What about completely unhooking the cable? What would that do? It's got 38s and super low gears __________________ 71 c10 swb

01-30-2014, 10:47 PM	#9
ZMAR Registered User Join Date: Aug 2012 Location: Breck, tx Posts: 147	Re: TH350 won't upshift The cable is not too tight. __________________ 71 c10 swb

01-31-2014, 06:00 PM	#11
smashingchuck It'd be alot cooler if you did Join Date: May 2003 Location: Three Rivers, MI Posts: 2,345	Re: TH350 won't upshift Check for vacuum... keep the kick-down cable on there you'll want it with the 38s, regardless of your steep gears. __________________ 78 Build Thread 4Runner Build

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