TH350 - lost all fwd gears but have reverse - The 1947 - Present Chevrolet & GMC Truck Message Board Network

97guns · 02-26-2007, 05:31 PM

anyone know if i need a new tranny?

Longhorn Man · 02-26-2007, 05:43 PM

What's the fluid level... checked in park with the engine running after going through all the gears

What color is the fluid

What's the fluid smell or taste like?

Are you sure the linkage is actually working, both in and out of the tranny... should hear a definate click as it goes into each selection.

**WorkinLonghorn** · 02-26-2007, 05:52 PM

Quote:

What's the fluid smell or taste like?

Should taste like cherry cool-aid.

Do NOT attempt to put it in gear or even run the engine until you have checked the fluid,the filter,the valve-body connections and the linkage etc as LHM has mentioned.

Longhorn Man · 02-26-2007, 05:55 PM

good save.... fluid level is vital. Ensure it is good before you go trying to rev it up in drive or something.

Myself · 02-26-2007, 06:38 PM

No forward and have reverse=bad trans.

Longhorn Man · 02-26-2007, 06:58 PM

Probably, but you gotta cover the basics first.
And I have seen the shift linkage come disconected inside the pan where it controls the little piston deal, this caused this exact symptom on my last truck, it would go into neutral, but no further, yet, the shifter would move making me think I was in gear.
Odds are though, it's a bum tranny.

724x4a/cchevy · 02-26-2007, 07:02 PM

if the fluid is low, it will eventually shift into gear if you rev it a little. I wouldnt do this very long though. Tranny fluid is cheap, rebuilds aren't.

97guns · 02-26-2007, 07:12 PM

the fluid was low and i added a quart to bring it up to full. when i put it in a fwd gear there is no surge or anything.

As2rd · 02-26-2007, 07:15 PM

Should the linkage be exposed when you open the pan? I never opened mine but the shifter has too much slack internally. Sorry for going a little off topic.---Andy

Sonny · 02-26-2007, 07:22 PM

Ouch, a quart is a lot to loose. What did the color of the fluid look like? Dark fluid means bad things. You may get lucky by changing the filter. I am sure a tranny expert is lurking on here somewhere...

**WorkinLonghorn** · 02-26-2007, 08:40 PM

The prognosis isn't too good. Usually a trans that is just low on fluid gets fryed then the driver stands on the peddle trying to get his vehicle to move.
How many miles on the tranny? Condition of fluid is...?
Also a quart low,IIRC is not enough to run dry since the pan holds 2.5 quarts.

02-26-2007, 05:31 PM	#1
97guns Registered User Join Date: Jul 2006 Location: san jose Posts: 54	TH350 - lost all fwd gears but have reverse anyone know if i need a new tranny? __________________ '71 LWB 350/350 banana yellow '02 VW GTI turbo 14 sec. 1/4 mile

02-26-2007, 05:43 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH350 - lost all fwd gears but have reverse What's the fluid level... checked in park with the engine running after going through all the gears What color is the fluid What's the fluid smell or taste like? Are you sure the linkage is actually working, both in and out of the tranny... should hear a definate click as it goes into each selection.

02-26-2007, 05:55 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH350 - lost all fwd gears but have reverse good save.... fluid level is vital. Ensure it is good before you go trying to rev it up in drive or something.

02-26-2007, 06:38 PM	#5
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,131	Re: TH350 - lost all fwd gears but have reverse No forward and have reverse=bad trans.

02-26-2007, 06:58 PM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH350 - lost all fwd gears but have reverse Probably, but you gotta cover the basics first. And I have seen the shift linkage come disconected inside the pan where it controls the little piston deal, this caused this exact symptom on my last truck, it would go into neutral, but no further, yet, the shifter would move making me think I was in gear. Odds are though, it's a bum tranny.

02-26-2007, 07:02 PM	#7
724x4a/cchevy Self-proclaimed LED man Join Date: Nov 2003 Location: Harrisburg, Missouri Posts: 1,021	Re: TH350 - lost all fwd gears but have reverse if the fluid is low, it will eventually shift into gear if you rev it a little. I wouldnt do this very long though. Tranny fluid is cheap, rebuilds aren't. __________________ My LED Website My Photobucket Album of LED's Ask me about hand-made custom L.E.D brake and reverse lights. <- LINK I also do LED: -Third Brake/Cargo -Brake (truck and burb) -Reverse (truck and burb) -67-68 Front Turn Signals -69-70 Front Turn Signals -71-72 Front Turn Signals -GMC Front Turn Signals I can also do custom lights for other vehicles....i did a set for a AMC Gremlin once Norwood Survivor

02-26-2007, 07:12 PM	#8
97guns Registered User Join Date: Jul 2006 Location: san jose Posts: 54	Re: TH350 - lost all fwd gears but have reverse the fluid was low and i added a quart to bring it up to full. when i put it in a fwd gear there is no surge or anything. __________________ '71 LWB 350/350 banana yellow '02 VW GTI turbo 14 sec. 1/4 mile

02-26-2007, 07:15 PM	#9
As2rd Registered User Join Date: Feb 2007 Location: Lexington Park, MD Posts: 47	Re: TH350 - lost all fwd gears but have reverse Should the linkage be exposed when you open the pan? I never opened mine but the shifter has too much slack internally. Sorry for going a little off topic.---Andy __________________ 1972 Chevy Truck 350ci/th350 Auto. Daily Driver

02-26-2007, 07:22 PM	#10
Sonny Active Member Join Date: Jan 2004 Location: Centerville, GA Posts: 240	Re: TH350 - lost all fwd gears but have reverse Ouch, a quart is a lot to loose. What did the color of the fluid look like? Dark fluid means bad things. You may get lucky by changing the filter. I am sure a tranny expert is lurking on here somewhere...

02-26-2007, 08:40 PM	#11
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: TH350 - lost all fwd gears but have reverse The prognosis isn't too good. Usually a trans that is just low on fluid gets fryed then the driver stands on the peddle trying to get his vehicle to move. How many miles on the tranny? Condition of fluid is...? Also a quart low,IIRC is not enough to run dry since the pan holds 2.5 quarts. __________________ '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, 2nd owner, Work-Truck supreme. Best $300 I ever spent. Last edited by WorkinLonghorn; 02-26-2007 at 08:45 PM.



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