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#1 |
Registered User
Join Date: Nov 2009
Location: Casper, WY.
Posts: 15
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TH350 shifts hard
My th350 shifts really hard from park to a gear and going down the road it shifts gears hard. I replaced the vacuum modulator and it still hard shifts.
My truck is a '76 gmc 1/2 ton k15 and used mainly for fishing. I'm afraid I'm tearing stuff up with it shifting hard. I am also starting to wonder if someone put a shift kit in it. Is there anyway to tell without opening the trans.? |
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#3 |
Robert Olson Transport
![]() Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,287
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Re: TH350 shifts hard
im gonna second the shift kit idea.... as long as the vacuum is good
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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#4 |
Registered User
Join Date: Mar 2009
Location: Midland, Tx
Posts: 418
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Re: TH350 shifts hard
Check your fluid level as well
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1972 GMC C10 Last edited by Manbearpig; 11-27-2009 at 12:06 AM. |
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#5 |
Registered User
Join Date: Nov 2009
Location: Casper, WY.
Posts: 15
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Re: TH350 shifts hard
I don't have to be gettin on it for it to shift hard. It pretty much does it all the time. Anyway to check it? who puts a shift kit in a gmc beater anyway, thats crazy to me.
Last edited by Desertryder; 11-27-2009 at 12:13 AM. |
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#6 |
Badass
Join Date: Jan 2009
Location: lox. fl
Posts: 4,586
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Re: TH350 shifts hard
smell it too.if it smells like burnt toast,dont change your fluid you only going to make it worse
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Think outside the box? -84c10 (1stcar)→My Build← ![]() -00 Saturn 5spd drop a gear and disappear! 1/4:13:90 ![]() |
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#7 |
Registered User
Join Date: Mar 2009
Location: Midland, Tx
Posts: 418
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Re: TH350 shifts hard
Lol I have a shift kit in mine
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1972 GMC C10 |
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#8 |
Registered User
Join Date: Nov 2009
Location: Casper, WY.
Posts: 15
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Re: TH350 shifts hard
lol, i didnt mean to insult. Doesnt it bother you when it throws itself into gear like your waiting to drag race someone?
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#9 |
Registered User
Join Date: Oct 2009
Location: Tulare, California
Posts: 38
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Re: TH350 shifts hard
make sure you are getting good vacuum from the intake/carb. i know mine was shifting real hard and it wasnt getting good vacuum. we gave it a good tune up(rebuilt/tuned carb, timed, etc) and it fixed the vacuum for the trans as well as the advance on the dist. runs great now.
Last edited by Twitchin R&C; 11-27-2009 at 08:04 PM. |
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#10 | |
Rottenwood Garage Member
Join Date: May 2005
Location: Marietta, Georgia
Posts: 4,321
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Re: TH350 shifts hard
Quote:
Thats my vote!
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2004 Chevrolet Suburban C1500 2001 Chevrolet 2500HD Crew 6.0 1999 Harley Davidson Electra Glide 1972 Chevrolet C-20 Custom Camper "Dump Truck" 1972 Chevrolet C-20 Suburban "Big Green" 1969 Chevrolet C-50 Wedge Hauler "Leonidis" 1966 C-10 2x4 short fleet 327 4 speed "Race Truck" 1952 Plymouth Cranbrook "Rican" (my grandfathers) 1931 Ford Model A Coupe "Black Beauty" 1930 Ford Model A truck "Club Cab" 4x4 Rottenwood Garage and Speed Shop.....where everything must be racy! It's not just a hobby..It's a LIFESTYLE!!! Thanks for nothing Barrett-Jackson You cant fix stupid or teach accountability! Time wasters, looky Lous and tire kickers are everywhere! |
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#11 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: TH350 shifts hard
Check for a cracked vacuum line. A low vacuum to the modulator will make your tranny shift hard.
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Frank |
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