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#1 |
Registered User
Join Date: Feb 2010
Location: Louisville ky
Posts: 398
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is my granny 4spd sychronized?
I have a 72 c20 2wd 4spd it has the factory 350 still in it running great but what Im trying to figure out is if the transmission is sychronized or not I do not know which 4psd or the gearing I have aint had it that long I say it is definatly not after driving it but I have people telling me that it is mine is just messed up, I just want to know if any of the transmissions in these trucks were not synchronized.
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#2 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: is my granny 4spd sychronized?
The one in my '71 is sychronized in all forward gears, except 1st gear (low gear).
I rarely ever use 1st because it is so low. Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#3 |
Registered User
Join Date: Feb 2010
Location: Louisville ky
Posts: 398
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Re: is my granny 4spd sychronized?
the reason i feel mine isnt is when im drving it I have to double clutch to get it into gear and I also cant downshift at all I have to stop to go to a lower gear than what im in and I have never used 1st gear I just know its made to pull and I havent yet
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#4 |
Registered User
Join Date: Mar 2003
Location: San Francisco, CA USA
Posts: 2,454
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Re: is my granny 4spd sychronized?
Your clutch may not be disengaging completely. Does the transmission grind when you try to shift from neutral into 1st or reverse from a dead stop?
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#5 |
Registered User
Join Date: Feb 2010
Location: Louisville ky
Posts: 398
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Re: is my granny 4spd sychronized?
no, like I said I havent used 1st and reverse worked fine, it didnt grind which I thought was odd because my dads 82 for wrecker has the granny 4spd and it is a paint to get into reverse and my old f150 was also a pain I guess thts a ford thing, also when i BOUGHT THE TRUCK IN FEB THE GUY SAID THE CLUTCH WAS A FEW MONTHS OLD tht could have been a lie but I have not seen it it out yet and the clutch feels fine
Last edited by darush01; 05-30-2010 at 07:24 PM. Reason: typo |
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#6 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: is my granny 4spd sychronized?
I have never driven an older granny 4-speed with synchros on low gear. Not saying they don't exist, but I've never seen one.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
Registered User
Join Date: Feb 2010
Location: Louisville ky
Posts: 398
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Re: is my granny 4spd sychronized?
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#8 |
Registered User
Join Date: Mar 2010
Location: wy
Posts: 14
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Re: is my granny 4spd sychronized?
If you are not grinding gears when shifting that would tell me the synchros are doing their job. Hard to shift with no grinding might indicate the clutch is not releasing properly.
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#9 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,647
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Re: is my granny 4spd sychronized?
My mistake... I mis-read your post. Now that my head is on a bit straighter, no, all gears except reverse and granny low should have synchronizers. I gotta agree with 72diesel's post above.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#10 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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Re: is my granny 4spd sychronized?
mine shifts smooth up and down 2nd through 4th
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#11 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
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Re: is my granny 4spd sychronized?
Yup, 1st and rev are unsynced, 2nd, 3rd, and 4th have syncros. Mine shifts kind of hard when I downshift into 2nd but doesn't grind. To get into 1st or rev you have to be at a dead stop or it will grind, and sometimes if it won't pop in it helps to slowly let out the clutch while you keep pressure on the shifter. I used to drive a 73 f350 (I think the tranny was very similar if not the same) and it shifted identical to mine so I assume that is how they are supposed to work. I thought mine was a pain till I drove my wife's 41 gmc, now that one is a trick to drive without grinding
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#12 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: is my granny 4spd sychronized?
i'd throw some marvel mystery oil in the tranny run it for a few days of driving then drain it and fill with synthetic gear lube and see how it works after the fluid change
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#13 |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: is my granny 4spd sychronized?
In all of the manual shift vehicles I have ever had, (several) I always put the tranny in the highest forward gear (4th in a 4 speed, 5th in a 5 speed) before shifting into reverse. This always kept grinding to a minimum. I have had manual trannys in the following and this always worked:
71 Chevy El Camino SS 4 speed 82 Ford Escort 4 speed 70 Chevy Nova 4 speed 86 Ford Tempo 5 speed 80 GMC 1 ton 4 speed 93 GMC 3/4 ton 4x4 5 speed 72 Chevy 1/2 ton 3 OTT 71 GMC 1/2 ton 3 OTT Last edited by WIDESIDE72; 05-31-2010 at 10:20 AM. |
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#14 |
Registered User
Join Date: Feb 2010
Location: Louisville ky
Posts: 398
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Re: is my granny 4spd sychronized?
thanks for all the info, I wasnt really having a problem with the gears grinding I just cant get it to downshift at all from 4th to third or 3rd to 2nd I have to be at a complete stop before it will go into any lower gear
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#15 |
Registered User
Join Date: Feb 2010
Location: Louisville ky
Posts: 398
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Re: is my granny 4spd sychronized?
and I might just need to get used to this ruck more Ive only had it a few month and it is currently down for a few weeks ntu the other two trucks Ive had with grann 4spds 80 f150 and 82 f350 wrecker have been able to downsift with a little coaxing unlike my chevy, which is by far my favorite so I thank you for the advice and I will change the gear oil in the trans its probably pretty old
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