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3 Speed Pops Out
#1205075 Mon Feb 20 2017 07:01 AM
Joined: Jun 2008
Posts: 716
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UnklRod Offline OP
Shop Shark
My stock 3 Speed is popping out of 1st and 2nd while going down a hill. I have a three on the tree on my 57 truck. On flat roads it does fine. Any thoughts on what the problem is? While retoring the truck I bought and had a shop rebuild the tranny. I only have 2000 miles on the truck since the resto.

Thank you.

Jon


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Re: 3 Speed Pops Out
UnklRod #1205079 Mon Feb 20 2017 01:44 PM
Joined: Jun 2011
Posts: 3,548
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Poppet springs weak, thrust washer(s) missing or installed improperly, shift linkeage not adjusted properly, mainshaft or c'shaft bearings worn.

Ed


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Re: 3 Speed Pops Out
UnklRod #1205092 Mon Feb 20 2017 04:09 PM
Joined: Feb 2004
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Boltergeist
If the shift linkage is adjusted properly, you need to find another transmission shop and get them to fix what the first guy messed up. Don't bother going back to the first guy- - - -he's already proved what he can and can't do.
Jerry


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Re: 3 Speed Pops Out
Hotrod Lincoln #1205097 Mon Feb 20 2017 04:35 PM
Joined: Jul 2013
Posts: 986
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Ed and Jerry are spot on with this tranny problem. Linkage,internal bearing wear, or a worn main shaft will cause the tranny to pop out of gear. Had an early Muncie 3 speed in my 1958 Chevrolet that would pop out of 3rd. Had a so called tranny shop rebuild it and it still did the same. Rebuilt it myself with all new bearings and main shaft, adjusted the linkage to FSM specifications and no more problems.

Tim


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Re: 3 Speed Pops Out
UnklRod #1205102 Mon Feb 20 2017 05:11 PM
Joined: Apr 2005
Posts: 1,747
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Shop Shark
All of the above are causes. A worn front u-joint will also create problems. Popping out of 3rd gear is a common problem with these transmissions. There is a fix which places a spacer between the front bearing and the gear. You must also remove the spacer on the first row of needle bearings for this to work. This moves the gear further into the syncronizer. pre68Dave has info on this on his site also.
Popping out of 2nd and 3rd indicates to me that all of the above could be in play. In any event a replacement syncro drum and the 2-3 shift fork are in order.
Fred

Re: 3 Speed Pops Out
UnklRod #1205107 Mon Feb 20 2017 05:18 PM
Joined: Jan 2001
Posts: 4,975
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Originally Posted by UnklRod
My stock 3 Speed is popping out of 1st and 2nd while going down a hill.

These transmissions almost never jump out of 1st or 2nd if the linkage is adjusted correctly.


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Re: 3 Speed Pops Out
UnklRod #1205457 Thu Feb 23 2017 02:10 AM
Joined: Jan 2000
Posts: 446
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Shop Shark
Rebuilt mine almost 40K miles ago, it's been fabulous except the column shifter has always shaked/bounced a lot in 2nd. Just keep a hand on it to steady it, and it's never acted like it wanted to pop out of gear. Probably could stand linkage adjustment?? but never stay in 2nd long enough to take my hand off the shifter, so never considered it much of a problem.


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