Atlas transfer case

al1tonyota · Jul 26, 2015

Couple vids to compare tire speed first is 3.8 second is 3.0 different tires but still noticeable difference in the ol limiter :driving:

http://m.youtube.com/watch?list=FLfIC0LvPMavOYnMHaBn0a_A&v=a5s57mtpwdE

http://m.youtube.com/watch?list=FLfIC0LvPMavOYnMHaBn0a_A&v=1dguJ5VN9nQ

tommy450r · Jul 26, 2015

al1tonyota said:
Couple vids to compare tire speed first is 3.8 second is 3.0 different tires but still noticeable difference in the ol limiter
http://m.youtube.com/watch?list=FLfIC0LvPMavOYnMHaBn0a_A&v=a5s57mtpwdE

http://m.youtube.com/watch?list=FLfIC0LvPMavOYnMHaBn0a_A&v=1dguJ5VN9nQ

Yea the 3.0 gears looked a lot better to me.

tommy450r · Jul 27, 2015

just placed my order with ccor went ahead an got the 300m outputs to go with it!!!! now i just gotta wait about 2 weeks for it to be shipped.

i sure am glad ramen noodles come in so meany different flavors cause after that lick ima be eating them for awhile haha

redneckengineered · Jul 27, 2015

patooyee said:
I know lots of people who seem to believe that 2:1 t-case and rockwells are the PERFECT ratio for V8 rigs with decent power. I'm not sure that I believe that it is PERFECT but I do think that it is the closest to perfect that is possible without t-case ratios that until recently were only made available with a Hero. So if we go by that school of thought the perfect t-case * axle ratio is somewhere around 13:1.

3:1 case * 4.56 axle = 13.68:1.

I am currently 3:1 in the case with rockwells which puts me around 20:1. I have 400hp. I can romp it in low range in any gear but sometimes I do wish I had a bit more wheel speed in 3rd gear. The thing is that I can't always hold 1st gear high on a steep hill with traction which is 16.7:1. So that means that somewhere between 16.7:1 and 20:21 is a small zone where I wouldn't be happy which is why I think that 13:1 is still a bit too high for 400hp.

But 20:1 would be WAAAY too low with 500hp like you say you are going to. I would definitely want closer to 13:1 if I had 100 more hp. Hence my suggestion to do 3:1. I think you could live with a slight lack of power (if it even existed) in 3rd high until you bought another 100hp.

My personal theory is that 17:1 is my ideal ratio. But without putting Gearhart gears in my axles (which I can't afford) and without going to a Hero (which I also can't afford) that ratio is impossible to achieve.

Just my $0.02.

This is all right on. I'm 4.56 x 3.8 case = 17.33 and as a trail rider (not a bouncer) I love it and frankly never wished for more wheel speed. Typically I just leave the transmission in D and let it eat, I hardly have to shift. I do have a 4 speed Atlas though so I got 4.56 x 2.7 = 12.31 when I want to act a fool. My girlfriend's TN Mojo buggy is setup with 4.56 x 3.0 = 13.68, I've just cruised around in it a few times but it definitely will have tons of wheel speed, I could see her probably wanting to drop it into 1st for technical rock crawling more than you might with my buggy but other than that it's right in the sweet spot between crawling and peeling out. We are both over 500hp.

al1tonyota · Jul 27, 2015

redneckengineered said:
This is all right on. I'm 4.56 x 3.8 case = 17.33 and as a trail rider (not a bouncer) I love it and frankly never wished for more wheel speed. Typically I just leave the transmission in D and let it eat, I hardly have to shift. I do have a 4 speed Atlas though so I got 4.56 x 2.7 = 12.31 when I want to act a fool. My girlfriend's TN Mojo buggy is setup with 4.56 x 3.0 = 13.68, I've just cruised around in it a few times but it definitely will have tons of wheel speed, I could see her probably wanting to drop it into 1st for technical rock crawling more than you might with my buggy but other than that it's right in the sweet spot between crawling and peeling out. We are both over 500hp.

Dyno sheets or :gtfo:

you are the reason I kept it conservative and said 450!

patooyee · Jul 27, 2015

al1tonyota said:
Dyno sheets or you are the reason I kept it conservative and said 450!

You are the reason I kept mine conservative. I figure I've really got about 8000hp.

redneckengineered · Jul 27, 2015

al1tonyota said:
Dyno sheets or you are the reason I kept it conservative and said 450!

Mine and hers

:****:

bjeep · Jul 27, 2015

Man. She's got more motor than you do. And looks a hell of a lot better. :cougar:

tommy450r · Jul 28, 2015

Anybody know how much my driveshafts will change going from a np205 to a 2 speed atlas??

al1tonyota · Jul 28, 2015

http://www.atlas-tc.com/instructions/atlas.pdf
All the way down to the bottom all dimensions :dblthumb:

Can't find the same info for the 205 maybe you can measure your old one?

tallnate · Jul 28, 2015

redneckengineered said:
Mine and hers

:****:

dang, those are some impressive numbers. I say we throw the Hustler buggy in the mix and see who's the fastest in a straight line.

redneckengineered · Jul 28, 2015

tallnate said:
dang, those are some impressive numbers. I say we throw the Hustler buggy in the mix and see who's the fastest in a straight line.

Ain't nobody gonna touch the Trailer Park Panty Dropper son, depending on how far we drag the 4.56 gears and 2.7 low on the 4 speed is deadly. I can run it up to near 60 mph and it launches out of the hole. I didn't even mention that the motor was out getting a "rebuild" :woot:

xjpaddler · Jul 28, 2015

redneckengineered said:
Ain't nobody gonna touch the Trailer Park Panty Dropper son, depending on how far we drag the 4.56 gears and 2.7 low on the 4 speed is deadly. I can run it up to near 60 mph and it launches out of the hole. I didn't even mention that the motor was out getting a "rebuild"

T300 or t400???
And what converter??

redneckengineered · Jul 28, 2015

xjpaddler said:
T300 or t400???
And what converter??

TH400. Billet converter from TCS, somewhere around 2200-2500 RPM stall

tallnate · Jul 28, 2015

redneckengineered said:
Ain't nobody gonna touch the Trailer Park Panty Dropper son, depending on how far we drag the 4.56 gears and 2.7 low on the 4 speed is deadly. I can run it up to near 60 mph and it launches out of the hole. I didn't even mention that the motor was out getting a "rebuild"

haha yeah I bet your right. Those torque numbers are :tc

status.

Did I mention that this race would be planned right after a hard rain on an muddy uphill slope.. :stir:

1tfrot · Jul 28, 2015

stupid question, but are those #s to the ground or are those engine dyno #s?

EGarner · Jul 28, 2015

Re:

They look like the Mast Motorsports engine dyno sheets.

1tfrot · Jul 28, 2015

Re:

EGarner said:
They look like the Mast Motorsports dyno sheets. So @ the crank numbers I bet.

I was thinking the same thing but wanted to ask. if they are crank #s, then I'm down to join the race ;D

EGarner · Jul 28, 2015

Re:

That is what the sheet looked like from mast when I purchased the cam for my motor anyway.

redneckengineered · Jul 28, 2015

1tfrot said:
stupid question, but are those #s to the ground or are those engine dyno #s?

They are Mast sheets. Crank #s. My engine is a hand built forged stroker and hers is the drop in kit. I don't know many guys making 530 HP to the ground in a rockcrawler and who compares those numbers anyway other than car guys? Way too many variables.