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02-20-2007, 08:56 PM
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#1 |
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Registered User
Join Date: Feb 2006
Location: Oklahoma City
Posts: 588
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Tranny Problem
Aight I need some help. I have a t350 and it won't shift into 3rd. The 1-2 shift is pretty hard. I checked the vacuum line from the intake to the tranny modulator, it is good and attached. Has a metal line and a short piece of rubber on each end. Can somebody point me in the right direction?
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1970 Chevy C10 "Under Construction"  2002 Chevy S10 V6 
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02-20-2007, 09:03 PM
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#2 |
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To The Levy
Join Date: Jan 2007
Location: california
Posts: 391
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Re: Tranny Problem
Sniff the fluid, Not always conclussive, but will tell you if tranny is fried, if it smells burnt or dark in color, plan on a rebuild. or drop pan and check debri lying on pan, if there is alot of mud in pan and stuff clingin to filter you mine as well not put fluid back in it, but rather start pulling bell housing bolts to have it rebuilt. There are alot of shops (trans) that have em on the shelf, 350 trans. are pretty cheap, of course you will need to give them your old one for a core . good luck. thats my guess with what info I Have.
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02-20-2007, 09:13 PM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: Tranny Problem
Does it wind out real high before hitting 2nd?
Try driving it like a stick shift. Rev it just a little higher than it would on it's own, and slip the shifter into 2nd. Don't have the pedal down hard, just kinda cruise it, then try the same for 3rd. If it shifts, and your vac line is in fact good on both ends then a new modulator valve would be my first step. If it doesn't shift when you do that, i would suspect a stuck govonor weight. |
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02-20-2007, 09:19 PM
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#4 |
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Registered User
Join Date: Feb 2006
Location: Oklahoma City
Posts: 588
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Re: Tranny Problem
The fluid looked and smelled good.
Yes, it does rev super high in 1st. Ok thanks, I will have to try that tomorrow. Does the modulator just have one bolt holding the bracket in and then just pop out?
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1970 Chevy C10 "Under Construction" 2002 Chevy S10 V6
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02-20-2007, 10:30 PM
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#5 |
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Registered User
Join Date: Jan 2007
Location: Alexandria VA
Posts: 77
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Re: Tranny Problem
the modulator has one bolt that holds the bracket, take the bracket off and then pull the modulator off, when you install the the new one make sure you put the bracket on right.
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70 C10 SWB stepside forsale 00 Silverado Z71 Sold  95 Eagle Talon TSI turbo (Hellz ya its fast) 70 Chevelle 69 firebird 10 Silverado 4x4 |
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02-20-2007, 11:01 PM
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#6 |
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Registered User
Join Date: Feb 2007
Location: Lexington Park, MD
Posts: 47
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Re: Tranny Problem
Yeah i just replaced mine, got the adjustable one from AutoZone ($15). Has a red stripe, and came with instructions on adjusting it. Also came with a new o-ring and elbow hose. Make sure your vacuum line isnt clogged or kinked.---Andy
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02-20-2007, 11:07 PM
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#7 |
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Registered User
Join Date: Feb 2006
Location: Oklahoma City
Posts: 588
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Re: Tranny Problem
Vacuum line is not clogged or kinked, got vacuum at the modulator. Going to look a little deeper tomorrow.
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1970 Chevy C10 "Under Construction" 2002 Chevy S10 V6
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02-21-2007, 11:23 PM
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#8 |
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Registered User
Join Date: Feb 2006
Location: Oklahoma City
Posts: 588
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Re: Tranny Problem
Aight thanks Longhorn Man, I went and drove it today to shift it manually and it would shift. I then stopped by Autozone and $10 later I had a vacuum modulator. Installed and it shifts great now. Woohoo. Also replaced the rubber parts of the hose since I was there.
__________________
1970 Chevy C10 "Under Construction" 2002 Chevy S10 V6
Last edited by st1x10; 02-21-2007 at 11:24 PM. |
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02-23-2007, 04:20 PM
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#9 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: Tranny Problem
good deal.
I like that troubleshooting meathod, anyone can do it, and you don't get dirty. |
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