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Detroit Section Caretaker
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Spicer 3000 series were also common.
And Allison automatics.

Most anything available with an SAE #2 or #3 clutch housing will fit or can be made to fit.
 

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I have a fresh rebuilt Spicer CM-5052-C 5 speed direct transmission (SAE#2), clutch and pressure plate from behind a 4-53T if you are interested. I will also be heading towards Excelsior Springs Missouri in the near future....I rebuilt it with plans on using it in my truck. Shortly after I finished the rebuild I found a 10 speed roadranger which I am currently using behind my 4-53T.

Chris
 

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Part of your decision on what trans to use should be based on the weight of truck and common loads. If in a light weight vehicle(Jeep?) a 5 speed, close ratio trans(540) would suffice, a heavy vehicle might find a RR 10 speed more useful. Best fuel efficiency is at the torque peak(1700-1800 RPM) so final drive ratio, including OD trans. ratio should be about 3:1.

Ed
 
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