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#48715 08/05/2005 11:08 PM
Joined: Mar 2005
Posts: 388
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Hey guys, never driven my truck but was trying to find out what tranny I have in my '48 1/2t ,sb,deluxe,shifter in the floor. It feels like a 3 just by going through the patterns but could it be a 4? The lol I bought it from did not know . She only knew it was a straight and she didnt know how to drive a straight. Numbers or any help would be appreciated! Thanx ,Mike

#48716 08/05/2005 11:33 PM
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I believe all four speeds had a reverse lockout lever on the shift lever, so if the shift lever is clean, it is probably a three speed.

Baldy

#48717 08/06/2005 1:16 AM
Joined: Nov 2003
Posts: 53
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A 48 with a three-speed would have a column shifter. It sounds like it has an SM420 synchromesh 4 speed which was introduced in late 1947. To put it in reverse (from neutral), move the lever to the extreme left (against spring tension), and pull straight back. You can never discount the possibility that someone replaced it with a 3 speed. The 4 speed will have a 6-bolt pto cover on the side of the transmission.

#48718 08/06/2005 3:13 AM
Joined: Mar 2004
Posts: 3,068
'Bolter
'Bolter
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Posts: 3,068
A three speed shifter will have brackets and linkages mounting it to the side of the trans. A four speed shifter goes directly into the top of the trans,
Scott


Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!
#48719 08/06/2005 11:05 AM
Joined: Jun 2005
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if its a 3 speed reverse is to the left and forward a 4spd is to the left and back unless it has later 4 speed which is to right and back.

#48720 08/06/2005 3:00 PM
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Thanx Guys ! It's almost like wait and c but Ill find out someway. Mike


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