PEAK PUTTERS

How hard would it be to make a 242 planetary reduction box with a fixed yoke output? Is it as easy as chopping off the front output section and putting on a slip yoke eliminator? Yes, 2wd, but with hi/low.

That's the select trac with a differential inside. I'd start with a 231 as it has no front to rear diff. Or better yet find an old np207 from a carbed cherocar it already has a fixed rear yoke. The input splines are interchangeable so you wouldn't have to worry about that part. Other than that it's just a cut and weld procedure.


Whatcha building?

Lots of stuff in my brain. . .

This idea was for using a 4x4 AX15 to a planetary box with a fixed output to a rear end with 3.00 or so gears and a 4 banger. . .desert race stuff.

I've got a 207... Help me find a Waggy D44 front...

Depending on the 4 popper an ax5 may be a better choice. They are just a W series yota trans so they can take a bit of abuse. Finding a bellhousing to allow an ax15 to bolt up may be a bummer. A 3rz yota hooked to a ax5 would be easy and a simple 150hp stock...

It is a little more complex than that. . .

Motor has to be a 2.4 chevy ecotec. (200HP, 170ft/lbsish in this form)

If you use a Pontiac Solstice/Saturn Sky bellhousing, they bolt to an AX15 just by using a longer pilot bushing. The stock tranny for the solstice is the AR5/MA5. . .same deal as an AX15, R154, etc. etc.

I do like the AX5 though. . .they are lighter and still tough little buggers.

The rest of the story is to use 2.86 gears in a Ford 9" to get 7.48:1 final drive. With the powerband of the motor being in the mid 5,000 range and the overdrive 5th gear, it should be able to push very close to 100mph in a 2300lb race car. Above that (well. . .above about 90) the aero goes exponential in a bad way and kills most any 4 banger. . .

Most people that run in the class I am looking at either use transaxles (buggies) or TH400s. . .yeah.. .it takes 70HP+ to run a TH400. . .so it doesn't take a rocket surgeon to realize that a manual tranny will run away pretty fast. The good news is that desert people don't know the secrets that wheelers do. . .

West Coast Differential has 7.33 gears for a Ford 9".
This would remove more drag with less parts.

Ahh I'm tracking now... What about a aw4? They don't suck up THAT much power and you can do paddle shifting if you wanted to. I just so happen to have learned a few things about them lately go figure.



Toby too bad you don't need a driver drop front, I have a line on a couple complete rigs for cheap...



James just think of the amount of heat generated by the planetaries spinning at that speed... Need a pump and a big cooler to keep them alive. If I even thought about it I'd be running a 241 gear set so it'd have 6 planetaries for strength... but that'd also create more heat... crap. yea just put 7.33's in a 9'r and go with it.

True. . .that is a trade-off.

The reduction box allows the use of a taller R&P and, therefore, a bigger pinion. It also distributes the shock loads a little more evenly. But. . .I'm not sure I've heard of anyone breaking a 9" pinion behind a 4 popper. . .axle shafts yes. . .but I can't recall a pinion. I guess keeping the driveshaft velocity down is another concern and may be why all of the Pro2 trucks and Trophy Trucks are starting to go with reduction boxes.

Trust me, the jury is still out and it is completely hypothetical at this point.

The very easiest thing to do would be to use the transmission that comes with the Solstice motor. . .it is virtually the same as the AX15 and has been used in dang near everything. . .including heavy a$$ Hummer H3s. The other nice thing is that they already have a fixed yoke. Of course, it isn't a normal 1350 u-joint. . .but I would guess that there is a way to make it work and still be tough.

Does the solstice trans have a yoke or flange?

Yeah. . .yokish flange. . .thingy. . .more like a flange so it would be easy to get something rolling.

EDIT: Bell Coupler. . .like this:

That's easy to get around.. Lathe a piece of plate to have the correct ID for a common flange yoke to center in and drill a couple patters and you're done.... Then put a 7.holycrapitsdeep set of gears in a 9'r and you're done. Yea I know it's not as fun as a reduction setup but it'll work.

Even better. . .it turns out to be a standard 27 spline Chevy output. . .ala TH350.

See what a little research and brainstorming will get ya?

And this is why I posted. . .

Now I gotta talk somebody out of a chassis. . .

HONEY . . ..can I have . . . .

That looks like the Rzeppa flanges I pulled out of the Minivan...

I`m looking for a d44 waggy driver drop for my Toyota.

Chrispy wrote:I`m looking for a d44 waggy driver drop for my Toyota.

Why the hell would you put a driver drop in a yota??

I think he's mistookenated . . .

Chrispy look again, I think it's a passanger drop!