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Anybody here run 7.17 gears? or I Hate you Zakk

B

ben427

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Damn you Zakk and your infernal rockcrawling!!! I just watched the video of my buddies from the weekend and am friggin hooked
big time! /forums/images/graemlins/thumb.gif heres the pics: http://www.rightcoastcrawler.com/Events/RockaThon/2003/Event/Story.html
But anyways, I just scored a dana 70 rear and 60 front, and since i cannot afford a doubler amd seriousy pondering getting a set of 7.17 gears to better my crawlability. This is a strictly off highway trailer queen, so highway revs are of no concern. I was only really worried about the strength of the pinion. I will be running 44s one day and dont want to worry about breaking pinions every time i stomp on the stupid pedal. Are my concerns valid?? or am i just worried about nuthin.
 
Don't do it, I've seen a 7.17 D60 pinion worn out by a TOYOTA. It looked like a pencil too, not a big item. I think I'd stop before I got into the 6's. 5.38's should be fine, I know a couple of high horse rigs running them without problems.
 
awesome pics and wright up /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
 
realisiticlly, the lowest i have ever seen live is 5.86's.

you coud run a SM465+205+5.86 = 75:1

OR!! the "Poor Man's Doubler!"

700R + NP208 or NP241 + 5.86 = 93:1 and you have OD if you need to run the RPM's up on the trail! the downside is a slip yoke, but IIRC, the 241 can be made to be fixed yoke.

OR! an underdrive system is ~$1000 which is decent, OR! an NP203 t-case from WMS.

Dunno. just throwing out ideas. my doubler ended up costing ~$2100 when it was all said, done, and running. but its 32 spline throughout, and flanges on everything.

see the sig. my work is done here /forums/images/graemlins/cool.gif

that is all.
 
p.s.

73k5tony510 runs a BBC402/465/205/5.13/44" TSL's in his trggy. andhe crawls just as well as I do, to be honest.

so with your 465/205/5.86 combo woul dcrawl very well in "normal" stuff but realistically, i find myself wishing for an 3.1:1 23 in the front of my doubler, as i have a very mild motor. i'm gonna gear to the moon as opposed to slap a BBC in there.

but 75:1 is a great start.
 
Im running 465/205/203 and a D60 front,D70 rear w/5.86s.Most of the time the 465/205 is enough.Oh yeah I also run 44s.Just havent had a chance to wheel with them yet.Ran 38.5 before that.Id stick with the 5.86s just for the durability factor.
 
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Don't do it, I've seen a 7.17 D60 pinion worn out by a TOYOTA. It looked like a pencil too, not a big item. I think I'd stop before I got into the 6's. 5.38's should be fine, I know a couple of high horse rigs running them without problems.

[/ QUOTE ] \

Thats kinda what i figgered, thats all i needed to hear.

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700R + NP208 or NP241 + 5.86 = 93:1 and you have OD if you need to run the RPM's up on the trail! the downside is a slip yoke, but IIRC, the 241 can be made to be fixed yoke.

[/ QUOTE ]

Im gonna stick with the 465 and 205 anyways, I really Hate automatic with a passion as i blew 3 700r4s and a 400 in tha last 6 months(not all in the same vehicles mind you), and i really dont lik the idea of dragging an aluminum t case over the rocks. So ill get the 5.86s for now, and start saving on the doubler.
 
I know a guy that was a '7? subrban with 44 boggers and 5.13's and he goes through 1 or 2 sets a year in the frontend. /forums/images/graemlins/eek.gif
 
I believe that the 5.86's are a nice compromise between strength and maximum gear . The tooth contact really gets slim in the 6 and above range . I have seen some strong granny four speed trucks live with 6.17's in them and they saw some regular highway speeds too. I only know of one person that stepped up to the 7.17's and he took them back out and went back to a 5.86 set up .
Most applications that came with the 6.17's or 7.17's were not intended for shock loads and I would think that rock crawling would be a very good test for the minimal tooth contact of those gear sets.
FWIW - The Air Force has short Dodge trucks that are Cummins equiped and have 7.17's in the Dana 60's and rear Dana 70's . These are weapon haulers for reloading the jets. Just thought it might help someone looking at a military auction that was intersted in some serious gear for some Dana axles .
Around these parts there are a few trucks running 5.86 gears and 44's with nasty BBC's and the gears hold up very well - I would like to put a vote in for the 5.86's they seem to be a happy medium between strength and max gear.
JMHO , Tom
 
What gears are in the axles? What are they out of? If they are m715 axles, then ... well ... /forums/images/graemlins/1zhelp.gif You got screwed.

But maybe they aren't, maybe they are the good d60/d70 axles. What gears are in the axles?

7.17 gears are going to be very weak.
 
There out of a mid eighties dodge. I know how shitty closed knuckle axles are, i avoid them. These have 4.56s right now.
 
to rock crawl? not very, IMHO.

i ran a mild350/TH350/NP203/4.10/39.5 and it was a joke compared to what i got now. killed 2 tranny's too.
 
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so how happy will I be with


396 bb, it's a mild/happy motor
t-400
203
4.56 gears


d44/14 bolt /forums/images/graemlins/thinking.gif

[/ QUOTE ]



Happiness is relative.....what will you be comparing to?

Here's my setup

402 bb, cammed for bottom end
th350
205
4.10 gears

d60/14 bolt
38.5" tires




It's not a "crawler" per se, but I can still get out there with the boys and have a good time. Of course, we'd all like to go 5.13s/203/205 etc. but my point (I think I have one? /forums/images/graemlins/grin.gif) is that you can get out there and have fun NOW!!!! Like this.....

Greg_on_Hell_s_Revenge.jpg

FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN FUN


I know enough people who have fallen victim to the "I need the ULTIMATE setup" disease, and their trucks haven't seen dirt/rocks (or the outside of a workshop) in a long time.....
 
Excelent point! That's why I ended up w/ 2 K5s. While building my '80 the way I want it, I've the '73 to keep me in the game.
 
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