Lowering Gear ratios

[Teach]

Here's a thought... What would happen if you put an Atlas t-case in between my TH400 and my Q-trac?

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Teach
'76 Wagoneer
360,Q-T,Edlebrock Intake/carb, D44's, 3.07, really big after market gas tank!
"If it ain't one thing, it's another...."

[JeepFreak]

Would you call your rig a Wagacrawler?

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JeepFreak

[Teach]

I was just curious if it would be possible. What kind of changes would be necessary, d-line, adapters,ect?

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Teach
'76 Wagoneer
360,Q-T,Edlebrock Intake/carb, D44's, 3.07, really big after market gas tank!
"If it ain't one thing, it's another...."

[JeepFreak]

Hey Teach, if your ever in OKLA stop by sometime and I will show you a M715 with a Cherro wide trac body bolted on. It is a site to see. The guy that has it goes to some events around here. He has some sort of a set up like you are talking about. I dont know much about the M715 so I dont know if his was stock or not. It was really cool though and it was something to see. He lives about 10 miles from me or atleast thats where I see the truck at.

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JeepFreak

[River Beast]

Teach,

The QT/TH400 setup is a unique one. The TH400 has a unique 10 spline shaft that mates to the QT. It is possible... but MANY hours of mods to the shafts/main gears.

You would have to cut the output shaft of the TH400, find a shaft that will mate with the Atlas and splice in on the TH400. Then fab and adapter plate to mate the Atlas to the QT and again mod a shaft from Atlas to the cut end of the QT 10 spline shaft of the TH400 to work from the Atlas to the QT....

WHEW!!!! lotta work ....but possible with proper machining.

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Todd
78 Wagoneer, "River Beast"
360/TH400/QT
Dana 44's locked w/ 4.89's
39.50x15x15 Super Swamper TSL's
7" SOA in front-7" Rear Shackle Inversion Mods
4" Skyjacker Softride
3" Trailmaster Bodylift
My FSJ site: http://www.geocities.com/spazz4life (http://www.geocities.com/spazz4life)
My E-mail: monster_fsj@hotmail.com
"If you can't stop...SMILE as you go under!"

'93 3/4 ton 4x4 Suburban...a.k.a. "FSJ Hauler"

[Teach]

Yeah, but isn't the Q-trac a stand alone unit, with no fluid exchange with the TH400? So all you would need would be a bracing unit between the Atlas and the Q-trac, a modified TH400 out-put shaft, and a modified output to the Q-trac. Can you imagine the crawl ratio? TH400 2.59 x Atlas lo 4-1 x Q-trac lo 2-1 x (oops) 44 axles 3.07 = 63.5 to 1 IN A WAGGIE!!(and would an Atlas work with a auto tranny?)

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Teach
'76 Wagoneer
360,Q-T,Edlebrock Intake/carb, D44's, 3.07, really big after market gas tank!
"If it ain't one thing, it's another...."

[River Beast]

Yes it is a stand alone unit... and you are also correct on your theory....will it work? Sure!!! if you got the time and money to fab everything.

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Todd
78 Wagoneer, "River Beast"
360/TH400/QT
Dana 44's locked w/ 4.89's
39.50x15x15 Super Swamper TSL's
7" SOA in front-7" Rear Shackle Inversion Mods
4" Skyjacker Softride
3" Trailmaster Bodylift
My FSJ site: http://www.geocities.com/spazz4life (http://www.geocities.com/spazz4life)
My E-mail: monster_fsj@hotmail.com
"If you can't stop...SMILE as you go under!"

'93 3/4 ton 4x4 Suburban...a.k.a. "FSJ Hauler"

[scotty]

now if youre gonna do somethin sick like an ultra low atlas and another tranny,its not really worth the time/money to adapt it to the QT.its not a bad case,but a couple of things make using someting eles a better idea. the first and foremost is the work required. 2nd is the fact that the QT is an aluminum chain driven case,and that the chain always drives the rear output.

also you are using the atlas as simply a reduction unit-not an xfer,if youre not using its front output.this does not take full advantage of the atlas,which comes with a twin stick shifter.

a simple reduction unit,or under drive,is available.its made by Klune V.you can get it in a 2.73 reduction,or a 4 to 1.and they can adapt it to almost any tranny and xfer imaginable.it was designed for jeeps,so it shares the circular NP bolt pattern,and is available in a 23 spline version that eill bot right up to a 727 and 219/228/229/231/241/242/208 jeep case with no adapters whatsoever.

the atlas is available in a driver or passenger side drop.luckily it was also designed for jeeps,and also shares the circle NP pattern,and a 23 spline input. a much easier way to get ungodly crawl ratios,and prolly pretty compartive in cost considering custom adapters for a th400 to atlas to QT would be simply swap in a 727 tranny,bolt a Klune V to that,bolt an atlas to that.no adapters,no fuss.if you get the 4 to 1 version of both,youd have something like a 141 to 1 final drive in first,even with the 727s 2.49 first(not figuring in the convertor,of course http://www.ifsja.org/ubb/smile.gif ) and very reasonable 3.55 axle gears.

you could save some by doing the same and substituting a dana 300 for the atlal.cast iron,gear drive,very strong,twin stick available, with its 2.61 low you would have a 92 to 1 crawl. plus you could choose between 4 to 1,2.61 to 1,or 10.44 to 1,depending on the combination of low ranges that you select.

let us not discuss the possibilities if we also installed a t18,and 4.88 axle gears...

on the m715- they used a divorced mounted case,so it would be easy to add another tranny with a married t case in front of it,giving you 2 t cases,and 2 useable low ranges.

whis would be a low buck alternative: keep the th400/qt,and add a divorced NP 205 behind it.it would be easier to swap n a driver side axle,and use the ford version(driver side drop),so you wouldnt have to get the front driveshaft around the QTs front output.im sure you could still mkae it work,tho,with the gm version.

RB this may be a good option for you,since you got soooo much lift,and the extra length would make the front shaft nice and long,as long as it didnt make the rear too short.you could also mount it lower,so the angles arent as bad-yeeeeaaah thats the ticket,all you need is a gm driver side divorced 205,make a crossmember to support it,and a tiny driveshaft to connect the QT to the 205s fornt output yoke.

no that would be cool http://www.ifsja.org/ubb/biggrin.gif

ok ok,one omre option: take your th400,and using the proper gm tailshaft,and the off road designs "doubler kit" install the range box form a 203,with a 205 behind it.

now im gettin alittle carried away.but as you can see,there are meny,many ways to skin this cat. but thats certainly enuff typin outta me.

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scott
85 grand wagoneer
258 with motorcraft 2bbl/904/twin stick dana 300/dana 44/welded amc 20
38x15.5 gumbo mudders
snorkel/dual batteries/onboard air/"custom" convertable
3 inch body lift/mostly stock suspension/"modified" fender openings
custom front/rear bumpers and brushgaurd

T18/dana-spicer 18 with drum E brake and PTO swap very soon
searching for offset QT rear and PTO winch

[This message has been edited by scotty (edited November 29, 2000).]

[joe]

Teach, anythings possible if you have the know-how and the money.
The old American Jeepster Club used to have a really good web site that had members rigs and a guy named Jorgen(?) up in Iceland ran two x-cases in Jeepster. I don't remember what the main x-case was that he used but he added a D18 divorced x-case behind it. If a 101" wheelbase Jeepster has room under it for 2 x-cases a FSJ will. This thing wasn't even remotely stock with at least some Land Rover suspension etc.
Too bad the new site of the AJC is just a lame web page with nothing on. Jorgens Jeepter was well worth seeing.

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Regards,
-joe
63 2-dr Wag, 73 J-4000, 82 CJ-8

[Teach]

Well, I was just thinking that it would be nice to keep the Q-trac for it's pseudo-limited-slip and just using a reduction type x-case to get that nasty ol' creep ratio down.

As for Jeepster, I had one pull me out from being buried diff deep two weeks ago with a 3500lbs winch. Thanks John Whynne!! (and thats a winch, not wench!!)

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Teach
'76 Wagoneer
360,Q-T,Edlebrock Intake/carb, D44's, 3.07, really big after market gas tank!
"If it ain't one thing, it's another...."