shifting an 8 speed

Should be 400 rpm splits. Try shifting at 900-1300 on the low range and 1100-1500 on the high side. 900-1300 on your drops.

 

When I change trannies I just tend to trust my ears. They'll tell you what to do if you're tuned in to the engine like you should be.

 

Series 60's sound fine at 14-18 but the MPG's suck up there!

 

I upshift around 1400' and down i try to be below 900. As a rule of thumb, when going down, multiply gear by 5 for mph. Ex. 35 mph, 7th, 25 mph, 5th.

 

Wish someone would have told me that when I was going through school.. that is a #### good ROT.

 

Someone doesn't have a Detroit, LOL if I shifted at 1400 the truck would fall on its face and laugh at me. That is a pretty good "rough" rule of thumb that can really help newer drivers out!

 

Yeah, the single stack mack attack would cough and die if I shifted then.. But I think our trucks are geared differently, since every load puts us at at least 80,000.. I shift @ about 2000-2100.. and down at 12-1300..

 

go too u tube , type in the shearch box tons of great info there

 

I don't have to run em' quite that high but loaded its probably 1800 or so, maybe 1650 or a little higher empty. But I am either empty at 33,000 or fully loaded to 80,000 there really is no in between for me.