Original 5 speed transmission??????
 

Looked at a 64-5 farm truck yesterday--looked to be a 2 ton. It has a factory 5 speed in it. Owner is considering parting out the truck but didn't know if the transmission's 5th gear is an overdrive or a 1-1 gear. Anyone know something about older 5 speeds and would it be a direct swap in for a 4 speed truck trans in a 72 4x4??

Re: Original 5 speed transmission??????
 

There are only a few 5 speeds that have the 5th as an OD. I cant remember what they are now. I was looking for one, couldn't find one so I gave up. Didn't really have a use for it anyways, but wanted one. I don't think they are a direct swap, there is an adaptor plate that bolts between the engine and bell, the clutch is huge, the reason for the bigger bell. Here is a link to some 5 speeds.

http://members.cox.net/jeepinrandy/r.../transinfo.htm

Re: Original 5 speed transmission??????
 

most if not all are direct not overdrive. The over drive part came in when the truck had a 2 speed rear
Again most had the emergency brake mounted to the trans yoke. Back in the day, 30 years ago my boss used one in his 72 swb 4x4

Re: Original 5 speed transmission??????
 

What is the shift pattern? Do you have any pics? I can find out what it is if it's a GMC and you know what model it is. I do know though that if it's a 64-65 GMC it's not an overdrive 5th unless it's been changed. Not so sure about Chevys.

Bob

Re: Original 5 speed transmission??????
 

Most big truck 5-speeds from that era had an ultra-low 1st gear,(6:50 to 7:25 ratio). 2nd gear was in the neighborhood of 3:50 to 4:00. 3rd gear was around 2:25. 4th gear was around 1:50, and 5th was 1 to 1. The only way I see those trannys working in a pickup is if you are running 44" mudders and want to use 5th as a "poor man's overdrive".

Re: Original 5 speed transmission??????
 

Clark made a 5 speed that is overdrive and it can be found in 1 ton and medium duty trucks but i can't rember what years they can be found it.

Re: Original 5 speed transmission??????
 

here's a little info on them.
http://6066gmcguy.org/SM420.htm