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Old 04-03-2012, 04:13 PM   #1 (permalink)
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Small transfer case for t5

Hey guys I'm planning on building a rat rod that I would like to go awd with and race road coarse (for shits) I currently have a 3.8 series 3 supercharged b/o/p motor that has a 2.2 bell hooked up to a world class t5 out of a mustang (I have to custom order the clutch from spec when I get to building the chassis but for now my question is

Is there any good "high speed" transfer cases id like to be up around 150 mph top end with a healthier then stock motor

I know the np205 comes in divorced but being cast iron it would kill my goal of under 2000 pounds and I'm not sure gear to gear would hold up to high rpm. But maybe I'm just over thinking? Is there any other options that would be reliable at say 400 horse? I just dont want to have to replace parts everytime I drive it hard?

Any info suggestions are greatly appreciated, Dirt
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Old 04-03-2012, 04:53 PM   #2 (permalink)
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you do not want a locked offroad-style t-case for an on-road car... you need one with a diff to allow for slip between the front and rear axle. I cannot help with anything specific to look for but I would go to a junkyard and look for big heavy AWD SUVs with V8s
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Old 04-03-2012, 04:55 PM   #3 (permalink)
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What about the AWD unit from a Typhoon or Syclone. It is a Borg Warner 4472 and will mate to an S10 5spd. S-10's used many different 5spds, including the T-5 for many years.

The Typhoon/Syclone 4472 have different chains in them than the Bravada/Blazer version. Not sure what is so much better about them, but GMC spec'd a different part number for the chains.
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Old 04-03-2012, 05:05 PM   #4 (permalink)
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Someone was telling me the bravada came with a transfer case with a viscous coupling I just didn't know if that would bolt up to the t5 output being a 2wd variant from a mustang, and I also didny know if the s10 t5 would hold up to the torque from the motor I'm gunna be using?
As for the typhoon, I've heard of them but I'm gunna assume it would demand high $$ price cause they are rare I'll do some research tho
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Old 04-03-2012, 06:07 PM   #5 (permalink)
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There might be a brand new BW4472 for a Typhoon sitting in storage here.
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Old 04-03-2012, 08:34 PM   #6 (permalink)
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I'm just trying to find the 4x4 rear section so it will mate up to a wc t5 which for some reason is like impossible and let me know if it comes up for sale
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Old 04-03-2012, 08:41 PM   #7 (permalink)
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Oh and from a little research they spec out a different number but they cross reference, its part number is like 153XX but they both sell as the same
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Old 04-04-2012, 05:08 AM   #8 (permalink)
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Since he is going for a road race application, a center differential or a coupler is desirable. A one to one ratio front to rear would be undesirable in terms of handling.

What are your suspension plans?

When you said that the chains cross-referenced, what did you mean? My Morse (the people that make the chains) listing shows them as two different chains. I have never had them side by side to distinguish and real difference.
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Old 04-04-2012, 11:48 AM   #9 (permalink)
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the 4472 and 1372 transfer case chain cross reference and from what ive seen the 1372 being the typhoon chain, so they are the same length and width etc so they will interchange (supposedly)

the car would also be for driving but I just dont want it to have bad road manners such as chatter(locked dif) wheel push and things like that

Suspension plans are somewhat unique basically ifs with the shocks inboard of the frame rails? I guess somewhat like an indy car has I dont want to go torsion cause it will be an open wheel car and in my opinion traditional ifs on a rat rod open wheel car looks like crap. The rear is just gunna be a straight axle probably 9 inch with either open or clutch posi dif

As for what Front axle Im gunna use Im still at a lose for that as well. I dont want to do a complete custom axle housing and have custom stub axles made along with cv axles cause im trying to stick to somewhat of a budget but I also dont want to throw a stock housing that looks like a pile of do do under it because the housing will be semi visible
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Old 04-05-2012, 07:04 PM   #10 (permalink)
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Id really like pass side drop because the cab is already gunna be small, can you clock that 4472 to be pass drop? or would that mess with the clutch in it?
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Old 04-05-2012, 07:51 PM   #11 (permalink)
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the subaru pro rally cars are good for that kind of hp and speed... maybe adapt your engine to one of their tranny/awd set ups.
just a thought.
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Old 04-05-2012, 08:44 PM   #12 (permalink)
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Quote:
Originally Posted by trkklr77 View Post
it will fubar the oil pick up for starters
what are you refering to? the clocking of the transfer case?

and as far as the subaru ive thought about it but the cv axles come out so far rearward they would bind and explode if I were to put the wheels up where they would look "right" the boxer 4 is a very short engine I think Ill just end up going with a drivers side drop
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Old 04-06-2012, 04:02 AM   #13 (permalink)
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What front differential?
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Old 04-06-2012, 04:36 AM   #14 (permalink)
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What front differential?
To be honest I'm not exactly sure what would be a good choice for it maybe 9.25 gm? It really depends on width if it doesn't fit side to side iinside the frame I would have to go custom stub axles I'm a 9 in housing, I'm trying to keep the truck on somewhat if a budget tho I've already got a thousand into the motor/trans without the t case
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Old 04-06-2012, 05:13 AM   #15 (permalink)
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9.25" would be a big differential for a rat rod. Assuming that it would be lightweight.

It would take a lot of work to make a 9.25 GM IFS or an 8.25 IFS into a passenger drop. The 8.25 IFS is available with no disconnect actuator, and a one piece shaft on the passenger side from Escalade's. This eliminates one of the major weaknesses of the 8.25 (the intermediate inner shaft).
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Old 04-06-2012, 11:03 AM   #16 (permalink)
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Originally Posted by Mh4Runner View Post
9.25" would be a big differential for a rat rod. Assuming that it would be lightweight.

It would take a lot of work to make a 9.25 GM IFS or an 8.25 IFS into a passenger drop. The 8.25 IFS is available with no disconnect actuator, and a one piece shaft on the passenger side from Escalade's. This eliminates one of the major weaknesses of the 8.25 (the intermediate inner shaft).
Is there any certain year that has these? or more desirable years? or were they used for the whole life of the escalade

And what do the astro's have for a front axle? is that the same 8.25" being full time awd wouldnt be non actuated?

Last edited by bighroder; 04-06-2012 at 11:09 AM.
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Old 04-07-2012, 04:44 AM   #17 (permalink)
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The Astro and Bravada use a 7.25" with a one piece shaft on the passenger side. Parts in these are tiny.

Not sure what years for the Escalade, but I do know the 02 diff I have here, and the 05 I just did last week both had the one piece shaft. If you find a core or a shaft and housing, you need both side gears to have the snap ring groove inside them to retain it.
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Old 04-07-2012, 07:14 AM   #18 (permalink)
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MH4 if you still have one of them can you grab a real quick width measurement from stub end to sub end? Just curious on the length of one, if they left no big deal, and thanks again for all the info, its been real helpful while trying to sort out this mass confusion haha, thanks dirt
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Old 04-07-2012, 11:42 AM   #19 (permalink)
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and about how much do those 8.25"s go for around you? I looked up a couple salvage yards and they are wanting like 900 ish for them?
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Old 04-07-2012, 06:00 PM   #20 (permalink)
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Call me Monday during business hours and I will measure it up for you. I actually have a spare extension tube and shaft sitting in the shop on the parts shelf.

The flange to flange measurement is the same width as the selectable 8.25's with the actuator. They just don't have that little inner shaft that snaps all of the time or the actuator.
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