first diesel
Posting Guru
Joined: Feb 2013
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that would be a c6 trans they are simple old dinosaurs to work on. but a lot of guys dump them for manuals, I put the newer e4od in mine and it made into a truck I could use. c6s then to cook themselves doing what I do.
Elder User
Joined: Nov 2013
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From: Manteca
A c6 would be about equivalent to say a TH350/TH400 in my book.. Yes they are old but they are a pretty stout transmission and can take what most can dish out to them. Parts are cheap and can be upgraded to almost bullet proof status for not that much coin, as stated above heat will eat these things alive. I have an 85 with a c6...
More Turbo
Joined: Nov 2000
Posts: 715
Likes: 11
From: Erie, PA
Keep in mind also that a C6 will loose you 10% of your crankshaft torque as it does NOT have a lockup converter. They are **** poor choices today with gas prices.
But yes, $1600 is a bargain if not rusted out.
But yes, $1600 is a bargain if not rusted out.
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New User
Joined: Aug 2014
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Really good imput guys. Which trany can help my power and mpg but not sacrifice the reliability?
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Elder User
Joined: Nov 2013
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From: Manteca
ZF5 or the 4 speed... Don't get me wrong the c6 is nice and you don't have to shift lol.. Either way an older 80's idi isn't going to be a fuel saver, just saying... They are work trucks, if your after mpg get a car like I did (Honda accord 30mpg..) And truck for pulling and camping
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Joined: May 2013
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From: Salem, OR
I have an 86 F 250 w/a C6, wouldn't trade it for an E4OD if you paid me. C6 costs about a grand to rebuild, E4OD about 2500. If you want an OD, get a gear vendor. I've had C6's in a couple of drag cars, and never had a problem. They will take more abuse than a 6.9 can deliver.
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Joined: Feb 2013
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A properly maintained e4od will last 250,000-300,000 thousand miles. A c6 will normally cook it's self in a 100,000. The c6s seem to work better behind gas motors because of the wider rpm range. I know guys that used there trucks just as hard as I do and didn't have a problem, where I could cook a c6 in two weeks. A trans temp gauge is well worth it, that's where I got mine to last longer because I knew when to back off or stop to let the trans cool off.
What you are going to do with the truck will decide if the c6 will work for you.
as for adding the gear vendor overdrive, you still lose 10-20% with the no lock up converter, and the new price tag of 2800 bucks is off putting.
The next guy will say you can find a used gear vendor way cheaper, you can also find a used other type of trans easier.
What you are going to do with the truck will decide if the c6 will work for you.
as for adding the gear vendor overdrive, you still lose 10-20% with the no lock up converter, and the new price tag of 2800 bucks is off putting.
The next guy will say you can find a used gear vendor way cheaper, you can also find a used other type of trans easier.