C-6 Shifting ?
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New User
Joined: Feb 2004
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From: Moab Utah
C-6 Shifting ?
Working on my daughters 70 swb 390-C-6, and have noticed, when starting of in 1rst, you can increase the speed up to 10-15 mph, let off the gas and the transmission doesn't release, it actually starts barking the tires and attempts to stop the truck??
It doesn't do this if I start off in drive, only in low 1,
Could something in the tranny be stuck?
I've checked the fluid, It seem a little dirty, but not burned or terribly discolored.
I'm considering a tranny flush at our local oil change shop, but if this doesn't help, where do I go next????
Tom
It doesn't do this if I start off in drive, only in low 1,
Could something in the tranny be stuck?
I've checked the fluid, It seem a little dirty, but not burned or terribly discolored.
I'm considering a tranny flush at our local oil change shop, but if this doesn't help, where do I go next????
Tom
Postmaster
Joined: Dec 2002
Posts: 3,959
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From: USA
I disagree. My C6 operates in 1st gear just like it does in Drive. Only difference is it doesn't upshift to second. It still lets the truck slow down and stop with the engine running without stalling or any hopping at the rear wheels.
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Joined: Feb 2004
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From: e-burg
yes it will run just like in drive only it will stay in first. but like i said earlier if u get the motor to lets say 2500 on a high comp. high displacement motor the motor wants to slow u down when u let your foot out of it this is normal. depending on gearing, traction, and type of suface that you are on when u do this depends on the type of reaction u get out of your truck. its fine
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New User
Joined: Feb 2004
Posts: 19
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From: Moab Utah
Let me clarify, this is a new problem, It didn't use to do this.
I understand compression, and the effects on the transmission.
This isn't the case.
Yesterday I drove the truck, and if left in first gear, any decelaration locks up the rear tire, if traveling over about 5 mph.
Tom
I understand compression, and the effects on the transmission.
This isn't the case.
Yesterday I drove the truck, and if left in first gear, any decelaration locks up the rear tire, if traveling over about 5 mph.
Tom
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Joined: Sep 2004
Posts: 68
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From: washington!
Mmm I am a bit rusty on auto trans theory but it could possibly be a sprag or one way clutch not releasing properly. Could be a sign of bigger problems on the horizon too. But thats all speculation on my part.
