C6 shifting problem
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Junior User
Joined: Jul 2006
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From: Los Gatos, Ca.
C6 shifting problem
Hi all,
I've got a 77 F-350 with a 460,C6 and 4.10 rearend. I have a shifting issue with the C6. To me it feels like it is'nt shifting to 3rd gear. A transmission shop looked at it today and they say it is shifting from 1st to 3rd and skipping 2nd. I think it's not going into 3rd because at 55 mph the engine is turning some high rpm's. I can manually shift from 1 to 2 but from 2 to D there is no shift. Also, all other functions seem fine. The tranny shop says it probably has a bad band.
I have no experience with automatics and could use some opinions on this.
Thanks, Randy
I've got a 77 F-350 with a 460,C6 and 4.10 rearend. I have a shifting issue with the C6. To me it feels like it is'nt shifting to 3rd gear. A transmission shop looked at it today and they say it is shifting from 1st to 3rd and skipping 2nd. I think it's not going into 3rd because at 55 mph the engine is turning some high rpm's. I can manually shift from 1 to 2 but from 2 to D there is no shift. Also, all other functions seem fine. The tranny shop says it probably has a bad band.
I have no experience with automatics and could use some opinions on this.
Thanks, Randy
Mountain Pass
Joined: Jun 2004
Posts: 241
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From: Canada
Check the vac. modulator hose at the transmission, you should have manifold vacumm there. Also when you pull the hose off the port, if you have fluid present, the modulator is no good. You probably have a control issue rather than a clutch/band problem. Don
Junior User
Joined: Nov 2006
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From: Soldotna
also how well does reverse work, because the high range/ reverse clutch's always go out because there's normally only 3 clutch plates instead of 4 or 5, I cant remember if the band plays a role in 3 gear or not, but as Don said it most likely a control issue, check the simple things first
Thread Starter
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Junior User
Joined: Jul 2006
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From: Los Gatos, Ca.
Thank you all for the replies. I have the truck back home so here is the real deal. The tranny shop is correct on this. The truck does skip over 2nd gear. It just shifts smoothly from 1st to 3rd. It will not downshift from 3rd to 2nd either. If going slow enough, then accelerate, it will downshift from 3rd to 1st otherwise it just lugs along in 3rd. The tranny does'nt make any strange noises or slip. All other functions are normal.
Junior User
Joined: Nov 2006
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From: Soldotna
to adjust the band tighten the stud to 10ft/lbs then back it off 1 1/2 turns and tighten the locking nut to 40 ft/lbs while holding the stud from moving, they say to replace the nut with a new one when doing this, but its up to you
Cargo Master
Joined: Jun 2003
Posts: 2,982
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From: Somewhere Saskatchewan
Originally Posted by IHC120
Thank you all for the replies. I have the truck back home so here is the real deal. The tranny shop is correct on this. The truck does skip over 2nd gear. It just shifts smoothly from 1st to 3rd. It will not downshift from 3rd to 2nd either. If going slow enough, then accelerate, it will downshift from 3rd to 1st otherwise it just lugs along in 3rd. The tranny does'nt make any strange noises or slip. All other functions are normal.
If there is a bunch of junk in the pan the lining has come off the band.
There are bands available that can be installed without removing the transmission.
It will depend on the band surface of the drum though.
