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06-23-2020, 10:11 AM | #1 |
Senior Member
Join Date: Dec 2012
Location: Payette, ID
Posts: 935
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Do I put in new synchro rings
Just acquired a 40 to 48 side shift three speed to get a good cluster for a rebuild into a 39 box. Took it all apart to find it in pretty good shape. Slight rust on 1st reverse slider. Cleaned up well.
The synchro rings look really good. I am resisting putting made in China pepro parts if originals are serviceable. |
06-23-2020, 10:42 AM | #2 |
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Join Date: Oct 2011
Location: Shelton, WA
Posts: 3,799
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Re: Do I put in new synchro rings
If the grooves inside the cone area are still present and the teeth have good sharp points where they engage, I would use what is there. If you have NOS OEM synchro rings then you wouldn't be gambling on the parts if you wanted to change.
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06-23-2020, 11:08 AM | #3 |
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Join Date: Apr 2015
Location: Sweden
Posts: 3,045
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Re: Do I put in new synchro rings
There is a gap between synchro and gear sideways...when that closes up it stops working.
So the size of the gap is a hint how worn it is. |
06-23-2020, 11:30 AM | #4 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,420
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Re: Do I put in new synchro rings
The gap between the brass synchro blocker ring and the gear part of the syncho is important. Since the blocker ring acts as a brake for the gear, it need to have enough meat on it to work properly. This ink is what Mac VanPelt had to say about the gap.
https://www.fordbarn.com/forum/showt...3599&showall=1 If it still has a good gap, use it. If not pitch it. Mac tries to get the best parts and he is aware of the reproduction blocker rings that don't fit right. I purchase my parts from him since he's a lot less likely to sell me a paper weight. |
06-23-2020, 11:36 AM | #5 |
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Join Date: May 2010
Location: NJ
Posts: 6,177
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Re: Do I put in new synchro rings
Fred @ Southside Obsolete (Barnfind08) has them NOS for a very reasonable price. While apart, I'd suggest replacing them.
Or, contact Mac VanPelt or Michael Driscoll. They will ensure the ones they sell you are correctly sized. |
06-24-2020, 09:39 AM | #6 |
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Join Date: May 2010
Location: Near Rising Sun, Maryland
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Re: Do I put in new synchro rings
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*Note of clarification...I mentioned where I purchased brass synchro rings above in case the OP wants to buy good quality new parts. However, this had little, or no affect in eliminating popping out of second gear as some other posts assumed this is what I was saying. The popping out of second occured with the original '35 gears no matter what I did trying to prevent this. The elimination of this problem occured when later '46 to '48 gears were installed and spacings of gears and other components were set to original specifications as outlined in MacVP's Book. Also, during this rebuild I used the original '35 shifter top and shift lever with special fork assemblies made to properly shift the later gear assembly,.....so, there were no better detents in this shifter top to help prevent jumping out of second gear. Just thought I should clarify this. I probably now have ~3,000 miles on this transmission conversation, and shifting is a remarkable improvement over what it was with original '35 gears.
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein Last edited by JM 35 Sedan; 06-25-2020 at 11:06 AM. |
06-24-2020, 10:41 AM | #7 |
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Join Date: Feb 2020
Location: BC Canada
Posts: 573
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Re: Do I put in new synchro rings
Maybe I need to look into changing mine. Pops out of 2nd when going down hill, have to hold the shifter to prevent.
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06-24-2020, 06:45 PM | #8 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,420
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Re: Do I put in new synchro rings
That may not be a blocker ring problem. It's more likely a wear problem but blockers can get problematic. Thrust slack is taken up by snug fitting parts with the counter shaft and the main shaft as a whole. If things wear too much, the thrust load can push it out of gear. Even a worn 2nd gear bushing could be at fault. They like to do that when the load reverses and thrust changes such as letting off the throttle & engine braking in 2nd.
Last edited by rotorwrench; 06-25-2020 at 09:23 AM. |
06-24-2020, 08:02 PM | #9 | |
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Location: NJ
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Re: Do I put in new synchro rings
Quote:
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