[allan5oh]

Yeah I'm still trying to figure out what you have, do you at least have a make?

Unfortunately eaton 9 speeds have very many different final gears:

.73
.74
.76
.80
.83
1

[Bandit102]

Yeah, I think its an Eaton Fuller. I re-checked my rpm's last night and my post is correct. at 60 mph, I turn 1475 and at 94 mph she's screaming out 2350.

Damn slow truck.

[sodbuster]

Good news, slowed down to 55 mph mpg went from 5.5 mpg to 7.2 mpg
and the engine noise is quite now, after a while it does not seem your driving that slow. But here in Texas driving 55 makes alot of 4 wheelers mad. Those 4.11 gears and 22.5 tires suck out on the hwy. But need the gear when hauling sod, it is so heavy :cry: :cry: just filled up to check mpg and diesel was $3.359, there changing the everyday now. :cry: :cry:

[allan5oh]

Originally Posted by Bandit102

Yeah, I think its an Eaton Fuller. I re-checked my rpm's last night and my post is correct. at 60 mph, I turn 1475 and at 94 mph she's screaming out 2350.

Damn slow truck.

I'll do a graph on friday when I get back.

I think it might be worth it for you to either swap that tranny, or maybe swap gears.

Unless you want to stick to 60.

[Bandit102]

I have a 13 speed, big bearing w/oil pump. It was rebuilt 2 years ago and never put in. I'm told it's a double-over - the high gear is against the dash. My 9 is the same way, but not double over??? Maybe that would make a difference? I've got 6 years on my clutch and thinking about replacing both pretty quick.

[RostyC]

Allen, would you mind doing another graph for me using a smaller gear?
Here is the old specs
425 Cat 3406B
3.90 rears
18 sp. RTL0 14918b
24.5 tall

I'm wondering what the graph would look like with a 3.55 or perhaps something smaller like a 3.36? I was doing some research on this engine and I'm curious to see how much of a difference it would make.

[Skywalker]

My bad....I thought he was talking about something "kinky".... :shock: 8)

[allan5oh]

http://i130.photobucket.com/albums/p...13speed355.jpg

http://i130.photobucket.com/albums/p...33613speed.jpg

Both are the same for your application.

[RostyC]

Thank you much Allen.

Wow, from that graph you can do 1,550mph at only 70rpm.