C6 Alternative replacement
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Senior User
Joined: May 2008
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From: Bentonville, AR
C6 Alternative replacement
I have a searched a number of terms and differing combinations of terms.
I have not found it answered anywhere....but...here goes...as if the title did not give it away already.
I would love a 4th or even 5th gear in my F250, 2WD, 6.9 IDI....I have the stock C6. Well I think I do...I am sure it has not been replaced to this point.
In essence, I want to get the RPMs down when on the highway.
What are my options?
Tim
I have not found it answered anywhere....but...here goes...as if the title did not give it away already.
I would love a 4th or even 5th gear in my F250, 2WD, 6.9 IDI....I have the stock C6. Well I think I do...I am sure it has not been replaced to this point.
In essence, I want to get the RPMs down when on the highway.
What are my options?
Tim
Cargo Master
Joined: Jun 2003
Posts: 2,982
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From: Somewhere Saskatchewan
You can't do diddly squat about lowering the high gear ratio in a C6 transmission.
For that you must think out of the box.
Other than installing an aftermarket overdrive system you can look at differential ratios and taller tires.
A bolt on overdrive costs lots of money.
Gear vendors make one at around $2500.00.
For that you must think out of the box.
Other than installing an aftermarket overdrive system you can look at differential ratios and taller tires.
A bolt on overdrive costs lots of money.
Gear vendors make one at around $2500.00.
Elder User
Joined: Apr 2003
Posts: 502
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Thats a tough one, nearly all automatic overdrives have an weak spot-and it takes big $$ to keep them alive. I too have a C6, behind a 429-and would love overdrive, but the cost, vrs. the amount I drive it, I might as well accept what I have.
For me, I might be able to build up an AOD trans, with an adapter to fit, but to go through the trouble, and cook the custom trans would slay me. Vrs. using a good ol cheap C6-that will last for years.
Another option would be a newer 5 speed-standard, but the effort and cost is high again.
These days, it seems if you must have a diesel truck, and auto overdrive, your best off finding a newer truck, factory made with all the good stuff.
sad but true.
However the gear vendors unit is very strong, and would most likely out last the diesel even.
For me, I might be able to build up an AOD trans, with an adapter to fit, but to go through the trouble, and cook the custom trans would slay me. Vrs. using a good ol cheap C6-that will last for years.
Another option would be a newer 5 speed-standard, but the effort and cost is high again.
These days, it seems if you must have a diesel truck, and auto overdrive, your best off finding a newer truck, factory made with all the good stuff.
sad but true.
However the gear vendors unit is very strong, and would most likely out last the diesel even.
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Joined: Apr 2004
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I suppose...you could put faster rear end gears in and use that low gear planetary for the C6 that tci makes. Still pretty expensive at over $700 just for the planetary...and you still only have 3 gears, but wider and less rpm in high.
I don't know if anybody makes a plate to put an AOD on an IDI or not (aren't they their own pattern?)...but if they do, definitely get a beefy one and put lower rear end gears to give that AOD as much advantage over the tires as you can stand!
Hah! Put a manual valve body in that C6 and find a two-speed rear end out of a truck! That would be freckin AWESOME!
I don't know if anybody makes a plate to put an AOD on an IDI or not (aren't they their own pattern?)...but if they do, definitely get a beefy one and put lower rear end gears to give that AOD as much advantage over the tires as you can stand!
Hah! Put a manual valve body in that C6 and find a two-speed rear end out of a truck! That would be freckin AWESOME!
Gear Vendors is the best option. You'll save fuel with any OD, but you're not going to save money.
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