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Author Topic: 4-speed trans stuck in gear  (Read 1634 times)

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Offline 65ShelbyClone

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4-speed trans stuck in gear
« on: June 03, 2014, 08:25:55 PM »
This happened about two weeks ago and I haven't gotten around to it until now. My '72 had been sitting for a year or two before I bought it and earlier is anyone's guess. It has a 4-speed trans that got stuck in 2nd gear while I was doing some shakedown runs close to home. Whatever happened, it's really stuck, but fortunately I can still move the car. Anyone had this happen before? I did once with a '65 Mustang and it was caused by a detent screw falling out inside.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.

Offline amc49

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Re: 4-speed trans stuck in gear
« Reply #1 on: June 04, 2014, 02:06:35 PM »
Don't know the exact details of trans guts on these but on others any interlock or detent that prevents going into two gears at once at the crossover gate can wear or break to do that. Outside synchro sleeve that moves to engage the brass can seize up on its' hub to do the same. Sometimes the little brake lugs (strut keys) that recenter the sleeve at neutral can break and pieces lock up the sleeve from moving. All those things could happen on the old B/W T-10s. I remember pulling the side covers to take a hammer/punch and hitting on sleeves to unlock them back out of gear when seized. Even had some less than fine quality shift sleeves crack in two at the fork groove to seize the works up, after that we scoured the land looking for the good rare solid body sleeves.

Always something simple but you find it when pulling down the trans. Maybe in the shift rail on these. MTX trans are very simple until you start adding in the preloads needed for front wheel drive types. Even those not hard but you have to pay close attention to the preloads or they get very noisy.


Offline 65ShelbyClone

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Re: 4-speed trans stuck in gear
« Reply #2 on: June 04, 2014, 05:22:49 PM »
Thanks for the reply. I'm really debating whether or not I want to bother pulling it out to have a look or to just pull everything and start the 2.3T swap.

Anyone know off hand about how much the 4-speed weighs? I know the bell and tail housing are aluminum, so it couldn't be that bad.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.

Offline ToniJ1960

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Re: 4-speed trans stuck in gear
« Reply #3 on: June 04, 2014, 09:32:30 PM »
 I dont know the exact weight but I had mine out once tying to rebuild it myself until I found broken gears. I could pick it up and carry it around the room myself and I weighed all of 121 pounds back then.

Offline 65ShelbyClone

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Re: 4-speed trans stuck in gear
« Reply #4 on: June 05, 2014, 01:57:26 AM »
Thanks. I won't worry as much when dropping it on myself. ;D

Now toploaders...t hose can be heavy.
'72 Runabout - 2.3T, T5, MegaSquirt-II, 8", 5-lugs, big brakes.
'68 Mustang - Built roller 302, Toploader, 9", etc.

Offline amc49

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Re: 4-speed trans stuck in gear
« Reply #5 on: June 05, 2014, 08:11:42 AM »
Yep. These weigh nothing like a HD V8 4 speed. Though aluminum Muncies were pretty light......... ...the Mopar one was the killer. Best boat anchor ever.

We tried a couple aluminum cased T-10s, they popped the cases pretty quick. The load just sheared mountings ears off like popcorn. It was even a problem with iron cases. After a short time Pop (a professional welder by trade) had gotten pretty good at rewelding the cast iron ears back on.