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#1 |
Registered User
Join Date: Nov 2013
Location: auburn, alabama
Posts: 23
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60 C10 3 Spped 1st Gear Downshif Scrubs HELP
Hi all,
My 69 C10 (3 speed manual transmission, shifter on the floor/ converted from three on the tree) scrubs when down shifting from 2nd back to 1st gear. The transmission appears to be an original for the 69 C10. The gears also hang from 1st to 2nd frequently. My greatest problem is that I can't down shift to 1st without coming to a stop (if I don't stop, it takes a while and there is a lot of scrubbing). I recently had both the clutch and flywheel replaced. Is this problem an indication that the transmission needs to be rebuilt. I'm considering a RESTORE of this truck (since the numbers appear to be matching) and I want to keep the original transmission. So my question is: (1) What would cause this problem ? (2) What action would be required to fix it. Thanks for your assistance in advance. |
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#2 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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If you will take a pic of the transmission and post it we can tell you for sure but dont sound to me like anything is wrong ,,,,,
#1 you say it is srubbing grinding ? When going from second back to first without stopping that sounds like a normal non syncronized 3spd #2 gears hang up when shifting from first to second ,,,, sounds like driver habbit just need a little practice ,,, Most everybody hates the 3 on the tree shifter they say they hang up ? I have drove these trucks with the 3 on the tree since about 1984 and never had a problem my 67 I have now shifts great for me but if anybody else drives it the gears hang up ? Ive been told the shifter is tore up ? Is it ? lol Anyway post a pic of the transmission I bet its a good ole non syncro 3spd ,,,
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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#3 |
Registered User
Join Date: Jun 2013
Location: Prescott AZ
Posts: 31
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
clutch linkage adjustment may be needed. this could solve both problems
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#4 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
If it has the original non syncro 3spd in it you have to stop to go from 2nd to 1st nothinig will change that , he says its hanging up shifting from 1st to 2nd so I'm assuming it shifts from 2nd to 3rd ok which means clutch is fine ,
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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#5 |
Registered User
Join Date: Nov 2013
Location: auburn, alabama
Posts: 23
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
Here are a couple from the video of the clutch/flywheel replacement.
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#6 |
Registered User
Join Date: Nov 2013
Location: auburn, alabama
Posts: 23
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
If this is a non synchronous transmission, is it possible to rebuild as a synchronous transmission while retaining the original housing.....?
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#7 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
You're right 67!
Double clutching will get you back to first But most people can't figure that out. Also shifting 3ott people don't understand it's a lazy 'H' pattern and not a straight line speed shifter. If it's hanging up on his 1 to 2 shift it's his shifter needs adjusting. |
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#8 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
That's a saginaw syncro 3spd it ust have bad syncos in it ? If it does I bet its got 2 or 3 mmillion mmiles on it LOL
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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#9 |
Registered User
Join Date: Nov 2013
Location: auburn, alabama
Posts: 23
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
What's a good guestimate on a rebuild.....?
Also, since I want to restore the truck, what other things should I consider doing to this transmission while getting it rebuilt (to maintain original parts, but improve driving experience) Thanks for your assistance in advance |
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#10 |
Registered User
Join Date: Nov 2013
Location: auburn, alabama
Posts: 23
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
Almost forgot..... don't know how many miles it has, the Speedometer/Odometer was broke when I got it. Have replaced the cable and added a 90 degree cable adapter (speedo connector sets right by the shifter linkage after conversion to floor) But the 250 CID 6 cylinder engine appears to run very well. It has quite a bit of Git-Up-N-Go. Working on Fuel gauge now (sender unit not working or wire to it is broke, got to figure out how to remove bench seats to get to tank)
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#11 |
Registered User
Join Date: Nov 2005
Location: Regina, Saskatchewan, Canada
Posts: 11
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
1st gear is most likely a "granny" gear. As far as I know that gear is not synchronized. Therefore, it is not meant to be used as "First" unless you are towing something.
That is why the gear grinds when you downshift into it. My 4 speed Saginaw is the same way. Start in second gear. A rebuild is nice, but you will have the same problem after |
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#12 | |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,622
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
Quote:
It grinds because of bad synchros and rebuilding it will fix it. Easiest way to spot a full synchro from a non synchro first tranny is the number of bolts holding the side cover on. 7 bolts for the full synchro, 4 bolts for the non-synchro. And for the op you can't make your non synchro tranny a full synchro type. Not enough room inside the case. |
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#13 | |
Registered User
Join Date: Nov 2013
Location: auburn, alabama
Posts: 23
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
Quote:
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#14 | |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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#15 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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Re: 60 C10 3 Spped 1st Gear Downshif Scrubs HELP
So now with pictures and we know it is a syncro transmission all you need is to take the transmission out and either have it rebuilt or I will bet you can find a good one cheap ive got like 4 of them I think the saginaw 3spd is a great transmission they last and last I bet yours just needs new syncros bearings and seals I bett all the gears are good ,,,,,, I have no idea how much it would cost ? Personally id just get another one you can swap that out in an hour ,,,,
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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