Roarin_8

iTrader: (5)

If I changed my 2.73s to 3.73s what would my RPM be cruising in OD. I have an SS3800 in the car now but it locks up so that shouldn't be an issue.

Also going from 3rd to 4th in WOT (which is hard on the tranny, I know) what mph will it shift at to get into 4th 115 or 120?

Harley-Davidson88

iTrader: (71)

At 75mph, you should be around 2600 RPM. The 3-4 shift should be at about 120 mph

2001NBMZ28

www.f-body.org/gears/ will give you some RPM/MPH numbers.

Roarin_8

iTrader: (5)

That Calculator helped alot, now when I upgrade the tranny, will it be ok to WOT into 4th?

blkZ28spt

Who is building it? Short answer, DON'T DO IT. The three harshest things on these trannies are getting on it if the temps are over ~200-210*, WOT downshifts (esp 4-2), and going WOT into overdrive.

Roarin_8

iTrader: (5)

When I say WOT into 4th, the tranny will be built up. Most likely I will go with a Level 4 setup. With my 2.73 I won't hit 4th until around 162 which I won't be doing. And I drive around in 3rd so I don't have to worry about the 4-2 downshift.

I just want to know that when I get the tranny built up, will I be able to go into 4th at WOT especially with a gear change to 3.73s which would shift me into 4th at around 120.

blkZ28spt

Even the 3-2 downshift at WOT isn't good for the tranny. Even a built tranny will take abuse doing that and WOT in overdrive. The design of the 4l60E is weak. There just isn't enough frictional surface area on the internal parts. (so i am told)