I have an identical truck, 1991 Ram W150 with a 318 4speed bull low. They're called a bull low (bo low, granny four speed, farmers 4-spd) because theyre really only built for towing heavy loads, theyre a farm tractor transmission. You should never use first unless your towing a load, start in 2nd. I dont rev it too high when I shift mine. Best tranny for offroading by far, it really delivers the torque to crawl up tricky paths.
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Every Truck seems to have different shift points in the gear selection process...
I use the 'guage by ear' method...
You will FEEL when to shift... if you have ever owned any manuel shifting vehicle...
The only exception to this rule has been experienced in an upscale ride... which seems to handle the RPMs a little more easily , if you know what i mean. ( wasn't it Brittney Spears who tore her "02 Lamborguine to pieces because she didnt realise it was not shifting on its own from 0 to 110 MPH...).
Try starting out in 2nd... and see if that feels good...
OR... slam 2nd at the get go .... like you have a 700+ HP engine pumping for you and you are starting the slide into a sweet groove
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