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lower R&P or doubler?

How to get a better crawl ratio

  • 203/ 205 Doubler

    Votes: 7 33.3%
  • 5.38 gears

    Votes: 6 28.6%
  • Other, please specify

    Votes: 6 28.6%
  • Just leave it alone and drive nekkid

    Votes: 2 9.5%

  • Total voters
    21

josh86k10

1/2 ton status
Joined
Feb 13, 2005
Posts
423
Reaction score
1
Location
Knoxville, TN
First, some current specs:
stock 305, TH400, NP208, 4.56r&p, 39.5 TSLs
So, 2.48 x 2.61 x 4.56= 29.52:1 (horrible)

Obviously I need lower gears, but I can't decide which route to go. First and formost, unfortunately money IS an issue. I've got to do this on a broke college kid budget.

Option 1: 203/205 doubler
2.48 x 2 x 2 x 4.56= 45.24:1
Downside: I currently have none of the components to do it. I figure a couple hundred bucks each for the 2 cases, $600 for the doubler adapter (from a shop here in TN), another couple hundred for the shifters, a few bucks for driveshaft mods, and make my own crossmember(s). I'd use my current 208 adapter and redrill the face of the 203. My brother has a 400/203/ford 205 setup with no home, but by the time I redrill and find another 205 and swap inputs I'm probably not coming out all that much ahead. I'd probably be looking at $1300, give or take $150.

Option 2: 5.38r&p
2.48 x 2.61 x 5.38= 34.83:1
To tell the truth, with my stock 305 it wouldn't be all that bad to have a lower high range. That said 5.38 is pretty low and it would definitely be turning some R's at highway speeds (especially with my 37" street tires). Of course, I pretty much only drive it around local and to the trails so Interstate won't be happening all that often. I don't know what it would cost to have the gears installed but I feel like this option would be around $1000. And it appeals to my lazy side b/c I won't be crawling around under the truck all weekend (fun when you've got the time, not so fun when you don't). But is 34.8 that much better than 29.5? Will 5.38's be tolerable on the street?

Opinions?
Other options?

Thanks guys.
 
you need th remeber with you final gear ratio to multiply x2...here is mine
700/208 513s
3.06x2.61=7.98x5.13=40.97x2 for the torque convertor=81.94...



with that beig said its not the greatest but its not bad...basicall a rule of thumb (greg72 and gmc4cw taught me all of this) is take your tire size and miltiply it times 4...thats your idea ratio...

i would go into your tranny trasfer case...have you looked into a black box or a klune??lightweight and tons a ger just not a selectible as a doubler but alot easier to install...read this thread it can help http://coloradok5.com/forums/showthread.php?t=212549&highlight=a+lowmax+question...
lemme know if you have any other questions..
 
you need th remeber with you final gear ratio to multiply x2
Yeah, my figures didn't account for the torque convertor. Mainly because I think that figure is so subjective. Obviously it makes a huge difference, but is that difference actually 2X? I don't know.
 
I've heard that too, but I've also heard 1.5X and 1.75X. Of course, 2X is by far the one I've heard most.
 
your best bet is to talk to greg72...he has a crawlcad and he is really good with this stuff and very helpfull send him a pm...
 
muddermilitia said:
yes this way is lighter but more $. And I dont know how well the 208 would hold up to all the added torque
i was looking at this and i talke don the phone with nwf and they said they had not heard any reports of anything...the 208 is not a 205 but it is one of the better chain drive cases...
 
Unless somebody wants to give me one, I don't think a black box, klune, or Atlas is going to fit anywhere near into the budget. Thanks for the suggestions though.
 
josh86k10 said:
Unless somebody wants to give me one, I don't think a black box, klune, or Atlas is going to fit anywhere near into the budget. Thanks for the suggestions though.
Aright, add up all the parts for what you have listed, and see how big of a difference the price really is.

If I had these choices, and all I had to do is save a few hundred more bucks for the best set-up ever, I think I would save a little while longer
 
Chaddy said:
Aright, add up all the parts for what you have listed, and see how big of a difference the price really is.

If I had these choices, and all I had to do is save a few hundred more bucks for the best set-up ever, I think I would save a little while longer
x2 on that one
 
Has anyone successfully done a 241 doubler? Assuming the 208 would stand up to a blackbox, it should also stand up to a 241 in front of it (since they are both 2.72:1) at least with a stock small block. The 32 spline DD 241 should be easy enough to find for cheap and the "Box4Rocks" doubler as seen on Pirate is pretty cheap too. It appears as though Duffy still has some 241 kits in stock from reading the post. Since it works with 6 bolt round t-cases behind it that would leave me options for better/ stronger rear cases down the road when funds permit/ circumstances mandate. For now I could do a 241/208 for pretty cheap. Thoughts?

Also, I appologize for being a cheap bastard. I do appreciate your suggestions and agree with you 100% as far as spending a little more to do it the best way when you can. The Atlas at $2400 is definitely out. The black box is actually cheaper than I thought it would be at $1600, but I still need to stay less than that if it is at all possible. Besides, it's not like a 203/205 is cobbled together junk or anything. And a 241/208 could be pretty cool too, assuming the 208 is up to the task. Paying for veterinary school is pretty taxing on the old wallet and it doesn't leave much time for any kind of a real income generator, thus I am trying to stay as cheap as possible. I may consider the best of best 6 years from now when I am done with school, but for now my hands are pretty well tied.
 
pm stallion about the 208/241 combo...i think the guy stopped making them and his reputation as good as usa6x6 on here...it took stallion months to recive his...i think if you call nwf they were selling the black box to ck5 members for 1300 bucks...remeber gear doesnt come cheap...
 
twoslo4five0 said:
pm stallion about the 208/241 combo...i think the guy stopped making them and his reputation as good as usa6x6 on here...it took stallion months to recive his...i think if you call nwf they were selling the black box to ck5 members for 1300 bucks...remeber gear doesnt come cheap...
Stallion has an Atlas in his rig. The black box is only gear....no twin stick action.

203-205 is big and heavy, and long with short drivelines.

Whats wrong with your rig right now? If nothing, then do nothing until your done with school because all your doing right now is wasting money.

If you plan on getting what you want in the future, then dont waste your money now on stuff you will have to TRY to sell later and not get what you paid for it.
 
Chaddy said:
Stallion has an Atlas in his rig. The black box is only gear....no twin stick action.

203-205 is big and heavy, and long with short drivelines.

Whats wrong with your rig right now? If nothing, then do nothing until your done with school because all your doing right now is wasting money.

If you plan on getting what you want in the future, then dont waste your money now on stuff you will have to TRY to sell later and not get what you paid for it.
i was talking about when he had his m1008..
 
How about a 3.10 low gear in your auto? not a huge difference, but cheaper than 2 pumkin gears.

I have a 465 for a 6.55 1st gear, but not everyone wants to play with 3 pedals.

How about a used Atlas, some are becoming avail, without adding extra weight...
 
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