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#1461544 Sat Aug 06 2022 01:22 AM
Joined: Feb 2015
Posts: 4
Hello Stovebolters,

Just purchased a 47 Gmc FC102. I owned a 47 3100 previously and it was a standard 3 speed. This truck has a 4 speed (muncie) but next to the soft knob is a lever (photo attached) Newb questions: 1. What 's the lever all about? Is that for shifting into reverse? 2. The previous owner said that the tranny is non synchronized in all gears, in going thru the gears on the road it doesnt drop into gear like my previous, there is some lite grinding before things mesh up. In researching this, looking over previous threads the muncie 4 speed should be synchronized in gears 2 thru 5. Could this grinding ( lack of synching up) be because the PO didn't use 90w mineral oil in the transmission? Thank you for your help!

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20220805_201844.jpg (72.62 KB, 69 downloads)

1947 3600 original drivetrain
Oldpickupman #1461555 Sat Aug 06 2022 11:32 AM
Joined: Feb 2001
Posts: 7,248
I guessing it's for a 2-speed transfer case. High And low.

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Oldpickupman #1461559 Sat Aug 06 2022 11:58 AM
Joined: Nov 2011
Posts: 2,716
Looks like you have a early 1947 model truck. That lever is for the non-synchronized transmission reverse lockout.

Oldpickupman #1461560 Sat Aug 06 2022 12:02 PM
Joined: Sep 2015
Posts: 99
What you have is affectionately known as "The Crashbox" 4 speed. No syncros in this beast, double clutching is the order of the day driving a truck with this trans.
The lever is your reverse lock out.


Oldpickupman #1461565 Sat Aug 06 2022 12:34 PM
Joined: Apr 2005
Posts: 10,952
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Your going to become a expert in double clutching.

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'47 Chevy 3100 5 Window (long term project)
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