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Quite the delima

hmatiak

hmatiak

1/2 ton status
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Savannah, GA
Well i have aready purchased the below listed blazer. This will be my frist venture back to the slushbox world in quite some time. I have plans of staying with the auto so the wife might be able to drive as well. Im willing to do this only because she likes my hobby as much as me.

So here is the issue:

The current setup is good for about a 20:1 crawl ratio with 37's. I dont see a point in investing money into gears for the 10 bolt and a 12 bolt ill be picking up. Im trying to do this as cheap as poissible, as i just bought a house and got married.

The only other option i see that is something i have done before and know it works, is the 465/205 swap. That wouls put me at around 55:1 with the granny first. Decent for the low end of the diesel.

Looked all over for 208 gear reduction sets with no luck. Thats the only other low budget thing i can think of.

Any suggestions welcome. Thanks

-Heath
 
What gearing does your axles have? I think you're also forgetting to factor in the convertor difference. With a TH400's first gear of 2.48:1 X the 208's 2.61:1 X (assuming a) 3.08:1 axle ratio with the convertor figured (X2) you have a 39.87 crawl ratio.
 
3.08 in the diffs. And i didnt figure in the converter either. The more it has to slip for the difference, the more heat it makes. Heat and auto's done like each other too much.
 
Whats the average stall behind the 6.2? Would a 40:1 be respectable behind that 6.2? Never to plan to go over 37's with the half ton stuff. Mostly a temp setup until this winter.
 
All i know is that the ideal crawl ratio is to match your crawl ratio with the circumfrence of your tire. In your case a 37" tire will be close to 111 so a 40:1 crawl ratio isn't that good.

Also, a TH400/208 is almost exactly the same crawl ratio as a SM465/205.
 
There is a 12:1 improvement with the 6.55 granny low compared to the 2.48 of the 400.
 
Don't forget you were asking about the TH400/208 combo versus the 465/205 combo. Remember that the 208 is 2.61:1 and the 205 is only 1.96:1

With that being said you're looking at 39.87:1 with the TH400/208 and 39.54:1 with a 465/205
 
Looks like i forgot to change the t-case ratio. Oops. Here is a link to the multiplier i was using.

http://www.4lo.com/calc/gearratio.htm

Curious as how you came up with the fact the TC doubles the crawl ratio.

And if anyone make gearset reduction kits. The make the wider chains, but thats all i could find.
 
A torque convertor is a fluid coupling which multiplies torque at just about a 2 to 1 ratio.
 
How Torque Converters Work

by Karim Nice
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Please copy/paste the following text to properly cite this How Stuff Works article:

Nice, Karim. "How Torque Converters Work." 25 October 2000. HowStuffWorks.com. <http://auto.howstuffworks.com/torque-converter.htm> 22 June 2008.


Inside this Article

  1. Introduction to How Torque Converters Work
  2. The Basics
  3. Inside a Torque Converter
  1. The Stator
  2. Benefits and Weak Points
  3. Lots More Information
  4. See more »
    1. See all Transmissions & Drivetrain articles

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Benefits and Weak Points

In addition to the very important job of allowing your car come to a complete stop without stalling the engine, the torque converter actually gives your car more torque when you accelerate out of a stop. Modern torque converters can multiply the torque of the engine by two to three times. This effect only happens when the engine is turning much faster than the transmission.
At higher speeds, the transmission catches up to the engine, eventually moving at almost the same speed. Ideally, though, the transmission would move at exactly the same speed as the engine, because this difference in speed wastes power. This is part of the reason why cars with automatic transmissions get worse gas mileage than cars with manual transmissions.
To counter this effect, some cars have a torque converter with a lockup clutch. When the two halves of the torque converter get up to speed, this clutch locks them together, eliminating the slippage and improving efficiency. For more information on torque converters and related topics, check out the links on the next page.
 
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