Atlas transfer case

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WyoBronc12
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Joined: Sun Feb 05, 2012 7:21 pm

Atlas transfer case

Post by WyoBronc12 »

How does an atlas 4.8 transfer case and 4.56 rear gears affect my engine rpms? Just curious I guess.....
1976 Sport, 302, C4, 4.11 rear 4.09 front, 3.5 in lift,33's...............
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Jesus_man
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Re: Atlas transfer case

Post by Jesus_man »

Here are some gear calculators to play with.

http://www.rocky-road.com/calculator.html

Are you looking for crawl ratio? We'd need to know what tranny you have too and size of tire. Oh and what you have currently. Feel free to put that stuff in your signature too.

For crawl ratio, just multiply tranny first gear, t-case low, & axle gears. If you have an auto, you can multiply your first gear by 2 to compensate for torque converter.

For instance my setup:
5.72 tranny
3.8 t-case
4.10 axles
= 89:1 crawl ratio.

Are you look at new Atlas's?
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org
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sbolt19
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Re: Atlas transfer case

Post by sbolt19 »

For some reason, I thought you were higher than that JD. I'm at 67:1 and I thought you were over double what mine is. I don't know why I thought that, but I did.
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Jesus_man
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Re: Atlas transfer case

Post by Jesus_man »

sbolt19 wrote:For some reason, I thought you were higher than that JD. I'm at 67:1 and I thought you were over double what mine is. I don't know why I thought that, but I did.


You are correct, but I didn't want to muddy the waters. I gave one of four of my options :)
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org
WyoBronc12
Posts: 27
Joined: Sun Feb 05, 2012 7:21 pm

Re: Atlas transfer case

Post by WyoBronc12 »

Yes i am looking at a new atlas. Mostly just planning how to spend my deployment money next year... I am going to have viper rebuild my trans this fall i think along with some headers and new exhaust.
1976 Sport, 302, C4, 4.11 rear 4.09 front, 3.5 in lift,33's...............
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Jesus_man
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Posts: 5988
Joined: Thu Nov 11, 2010 9:36 am

Re: Atlas transfer case

Post by Jesus_man »

Get a quote from Kincade Bauer for your Atlas. He saved me lots over ordering from Advance Adapters. His website is www.700r4inaford.com. Tell him J.D. sent ya.
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow.
http://www.ucora.org
WyoBronc12
Posts: 27
Joined: Sun Feb 05, 2012 7:21 pm

Re: Atlas transfer case

Post by WyoBronc12 »

Sweet man thanks for the heads up!
1976 Sport, 302, C4, 4.11 rear 4.09 front, 3.5 in lift,33's...............
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