C6 suddenly lost 3rd!

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Jan 14, 2003 | 03:55 PM

KONKILR

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C6 suddenly lost 3rd!

I stopped to get gas and after leaving the station the truck will not shift into 3rd gear. The trans still shifts between all other gears fine. The fluid was a little low, so I added some and no difference. What could cause this?

Thanks in advance.
jake

Jan 14, 2003 | 07:35 PM

Njbmx

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From: purgitory

C6 suddenly lost 3rd!

maybe the shift-indicator arrow says D but is in 2. i have seen this to be a common problem w/ ford auto's.

thanks,
pete

'82 F-150 longbed 2x4
300ci.
converted 3sp. tranny
glasspack w/ gutted cat
open 9" rear w/ 3.00 gears

Jan 14, 2003 | 08:33 PM

KONKILR

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C6 suddenly lost 3rd!

Nope I verified that it was in drive. I shifted the trans manually from 1-2-D and it never shifts into 3rd.

jake

Jan 15, 2003 | 07:09 AM

Nathan

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C6 suddenly lost 3rd!

Check to see if the passing gear link is stuck or disconnected leaving it in passing mode. If not, it could be the vac. modulator is on the fritz.

Nathan

Jan 15, 2003 | 08:49 PM

KONKILR

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C6 suddenly lost 3rd!

The kickdown linkage is not stuck. I checked that, plus the trans will downshift to first if you floor it at low speeds. I may have a spare vac. modulator I will try swapping it.

jake

Jan 16, 2003 | 01:20 PM

88_150

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Joined: Apr 2002

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From: Loxahatchee

C6 suddenly lost 3rd!

Please post the outcome on what was wrong, My C6 started doing the same thing

Thanks Bill

Jan 16, 2003 | 01:41 PM

honney

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C6 suddenly lost 3rd!

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Jan 25, 2003 | 04:04 PM

ghostech

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From: fl

C6 suddenly lost 3rd!

get under vehicle and pull rubber hose of the canister on the rearpass side must feel engine run up on rpm or have 17 inches of vaccum this is the first then make sure the lever going down to trans is not stuck toward the ground
later ghostech

Jan 28, 2003 | 06:46 PM

#10

KONKILR

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C6 suddenly lost 3rd!

There is vaccum to the modulator and the kickdown linkage is not stuck. I just put some BG quick clean to see if that will help. I will flush the fluid after driving it some and hope that helps.

jake

Jan 28, 2003 | 07:25 PM

#11

ghostech

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From: fl

C6 suddenly lost 3rd!

If reverse is strong what mile per hour at light throttle does second come

ghostech

Jan 30, 2003 | 01:44 PM

#12

KONKILR

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C6 suddenly lost 3rd!

Light throttle 1-2 shift at approx 1800rpm.

Moderate throttle approx 2400rpm.

Heavy trottle approx 3500rpm.

Reverse is strong anything over light throttle induces wheelspin even with a lot of weight in the bed. Power braking in reverse the clutches hold.

jake

Jan 30, 2003 | 06:24 PM

#13

kennethl6

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Joined: Oct 2001

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From: Central Virginia

C6 suddenly lost 3rd!

I would think you have a stuck 2-3 shift value in the value body. If so that may mean there is some trash in the fluid.

Jan 30, 2003 | 06:29 PM

#14

KONKILR

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C6 suddenly lost 3rd!

Thats what I am thinking. I put some BG quick clean in the trans, and I will flush it as soon as I can get it to my shop. The additive didn't make any difference so far. The trans was flushed a year ago with less than 3000 miles since it was done. If flushing doesn't help then I will install a full manual valve body.

jake

Feb 20, 2003 | 08:52 PM

#15

KONKILR

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C6 suddenly lost 3rd!

Nevermind on installing a manual valve body. Today the trans began to slip in second gear, but not in first. A freind of a co-worker is a ford trans tech. I will have him overhaul my trans for me. That should take care of all it's problems.

jake