Whats the final crawl ratio??? (1 Viewer)

ScottsHZJ80

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Feb 13, 2007
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Victoria, Australia
 
 
I'm assuming a few things here, like which gearbox you have, but your ratio should be (the gear you are in) x (transfer case ratio) x (diff ratio)

In the case of an auto 93 with an A442F and HF2AV in 1st gear, the equation would be 2.950 x 2.488 x 5.29 = 38.82

Ergo your crawl ratio in 1st low is 38.82 : 1

At least that is my understanding of it. I'm happy to be corrected.

Scott
 
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CreeperSleeper

Cascade Cruisers
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May 16, 2005
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Forest Grove, OR
 
 
 
That looks correct, Scott, but it doesn't take into consideration of the torque converter in the A/T... That makes it lower, but I can't remeber how to fudge those numbers.
 
Joined
Oct 7, 2004
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bone stock 80 is only 30.1:1. not very low. not low enough. Farr you've built a cool truck. make it lower
 

fj80toyman

...One Landcruiser at a time
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Sep 22, 2005
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So. California
 
 
 
It's always been my impression that "Crawl Ratio" is only used for 1st gear x transfer x diff - i.e. the slowest possible speed. Anything other than 1st gear isn't 'crawl'.

And the Torque converter does multiply torque but goes to almost 1:1 very quickly with increasing engine rpm so it can ALMOST be neglected in figuring out a number to talk about.

Semantics?

Dan.
 

Nay

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Aug 17, 2004
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Colorado
 
 
 
For real world use, you also have to factor in tire size, given that tire size directly affects the impact of diff ratio.

On 39's, your crawl ratio in reality is higher than on 35's with those same 5.29's.
 

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