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Old 05-26-2003, 03:10 PM
Greg55_99 Greg55_99 is offline
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Default Supra Turbo 5-Speed

Posted for informational purposes only.

The Jeep/Dodge AX15 5-speed, the Jeep NV3550 5-speed and the 87-92 Toyota Supra Turbo R154 5-speed all share the same case to bellhousing bolt pattern. As such there are a number of possibilities that can be had when a 5-speed is desired:

94-95 Dakota 2.5L bellhousing: Connects R154 to any K car based 2.2L-2.5L L4 in a RWD application.

94-99 Dakota 3.9L V6 Bellhousing: Connects R154 to any 3.9L V6 and any 273/318/340/360 V8.

96-99 Dakota 2.5L bellhousing: Connects R154 to any Jeep 2.5L L4. Because of it's GM inherited bolt pattern, also works with any Buick FWD V6 and supercharged V6, any Chevrolet 2.8/3.1/3.4 V6, any Cadillac 4.1/4.5/4.9 V8 and with a minor modification, any Olds Aurora DOHC V8 and Cadillac DOHC Northstar V8.

88-99 Jeep 4.0L L6 bellhousing: Connects R154 to any AMC 290/304/343/360/390/401 V8 and any 72 and later 232 L6 and 258 L6.

01-03 Jeep Liberty 3.7L V6 bellhousing: Connects R154 to any 3.7L V6, 4.7L V8 and 5.7L Hemi V8.

R154 Ratio’s
1st 3.30:1
2nd 1.95:1
3rd 1.34:1
4th 1.00:1
5th 0.75:1
Rev 3.20:1

The R154 is a particularly robust transmission. It shares it's design with the AX15 but is built to a different spec. Not in the Tremec class, but better than a T5. It would work well in certain applications. The deciding factor to use something like this would probably be cost. Good used R154's can be had for about $300 and bellhousing for about $50. Converting to a hydraulic clutch would add a bit more expense but still, nowhere near the price of a Tremec. So, if you've got a 318 2 barrel in your daily driver, this might be for you. It should be pointed out that Australians LOVE these gearboxes for V8 conversions.

So, this is what CAN be done with stock, boneyard parts. Enjoy.

Greg William
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  #2  
Old 05-26-2003, 06:38 PM
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ehostler ehostler is offline
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Hey Greg-

That looks like a nice cost effective solution for a daily driver 318 car.

You've answered the bellhousing question.

Now for the un-answered questions...

Will that require the Supra disc inside a MOPAR pressure plate? What about the throwout bearing diameters?
With the MOPAR bellhousings, will the input shaft properly rest in the pilot bearing?
What kind of fabrication will be needed for the tranny cross member/mount?
What will have to be done to the tranny tunnel, to make this thing fit properly under the car?
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Old 05-26-2003, 07:03 PM
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amxauto-x amxauto-x is offline
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Ok, now how would that work with a built up 318, 340 or 360? Is it a strong enough tranny? How much torque and horse power do you think it can handle?
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Old 05-27-2003, 11:28 AM
Greg55_99 Greg55_99 is offline
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Hello Gents,
Good questions. I can only answer a couple though.

1. Q: Will that require the Supra disc inside a MOPAR pressure plate?

A: I don't think the Supra disk will work inside the MOPAR plate. BUT, the size of the input shaft on the R154 is 1 1/8" X 21 splines (VS. 1 1/8" X10 Splines for the AX-15) which matches the standard size of any V6 Toyota truck. Novak Enterprises in Utah has said they could do a custom clutch for $85.

2. Q: What about the throwout bearing diameters?

A: See attatched photo: The collar for the throw out bearing on the front bearing retainer for R154 is much shorter than the one on the AX-15, BUT they are entirerly interchangeable. There is a second style front bearing cover for the AX-15 that attatches a htydraulic throw out bearing. (Looks similar to the center retainer in the photo) This style was available from 88-94. 95-up style (pictured) used a slave cylinder and arm to move the throw out bearing around. The type you use may depend on the size of the tunnel in the car. If the tunnel is somewhat narrow, you may have to use the early style because the slave cylinder is placed fairly high up on the bellhousing.

3. Q: With the MOPAR bellhousings, will the input shaft properly rest in the pilot bearing?

A: Input shaft stick out length on the AX-15 is 7.5". Stick out length on the R154 is 7.25". That quarter inch difference is no big deal, but Advance Adapters makes a pilot bushing that is twice as long a a stocker and can be cut to length if needed. The pilot bearing ID is not the same between the AX-15 and R154 so custom is probably in order.

4. Q: What kind of fabrication will be needed for the tranny cross member/mount?

A: I haven't eyeballed it but you'll have to fabricate a bracket to bolt the Supra tranny mount to the MOPAR mount. If you get the original tranny mount from the Supra, it makes it easier.

5. Q: What will have to be done to the tranny tunnel, to make this thing fit properly under the car?

A: Width wise, it doesn't look any wider than a TF but I can't tell you for sure.

6. Q: How much torque and horse power do you think it can handle?

A: I'd be guessing on that as well, but the Aussies LOVE these boxes behind built up V8's!

Anyhow, most of the info I've found on how tough the box is comes from Australian tuners who swear by it. Found some sites with some comments:

http://www.reberger.com/monaro/

This guy has a Non-turbo supra gearbox behind a built 389 Pontiac! I like!

http://www.autospeed.com/A_0260/pag...src=suggestions

This is just an installation article. Also a non-turbo gearbox. The turbo gearbox (R154) is MUCH better.

http://www.moparmarket.com/tech/archive18.htm

Scroll to near the bottom of the page. A gent here runs a Chrysler 360 with a R154.

And finally...

http://members.iinet.net.au/~ozrunne...ectsIndex.html

http://www.rodshop.com.au/bellhousings.htm

http://www.conversioncomp.co.nz/about.html

Match one up to anything you want.

Hey, it's just an idea.

Greg
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Old 05-27-2003, 01:11 PM
Greg55_99 Greg55_99 is offline
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Whoa... who reads these forums? I just opened my mailbox and got this message from a gent in New Zealand:


From: "Gillian & Colin Dray" <bellhousing@xtra.co.nz> |

Subject: R154's
Date: Tue, 27 May 2003 09:38:40 +1200

Hello Greg,
My friend Mike Neal of NZ has been sending me info re Supras, R154 transmissions.

Our company manufactures a wide range of bell housings for transmission conversion. We have sold a small quantity of R154 transmissions.

I visited California last July and saw one of the 'Big Supra' transmissions out of a Jeep truck. It looked just the same as the other R154's we have except the rear housing gearshifter was different. I would imagine it is just as good as the car R154.

If you could email me some photos of the AX15 it would be appreciated. Another bit of interest. A person in Auckland, NZ, has a 3L Supra drag car with 600HP at the flywheel. They have cooked one W58 trans, but a second one is just holding up. I am quite surprised it handles that horsepower under those conditions.

If you wish to post this email to others, we would appreciate it. We have bell housings for R154 - Chev V8, Ford V8, B. Block Chrysler, Jag V12 and others. Look at our website, www.conversioncomp.com.

Regards
Colin Dray

Conversion Components Ltd
Waihi, New Zealand


Hmmm... may be on to something. I suspect if you want to know what the horsepower limits ar on the R154, better drop him a line. Also, a W58 is the trans used in Non-Turbo Supras and not as tough as the R154.

Greg
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Old 05-27-2003, 02:24 PM
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ehostler ehostler is offline
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Hey Greg-

Thanks for posting the additional information.

The link from the email does not work... I think that I have seen that website recently though, as someone else had posted something about this conversion no too long ago. There really didn't seem to be much interest, because the pricing was putting it within $500 of the Keisler kit.
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Old 05-28-2003, 03:38 AM
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Just out of idle curiosity, what about the 6 speed manual used in late Supra Turbos? Anyone know if thats the same bolt pattern and would work the same?

I'm not up for fitting one ATM, my Mopar is a cruiser, but I'm already sketching the "next project" out in my mind...

Supra bits are reasonably easy to get over here.
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Old 05-28-2003, 04:11 AM
Greg55_99 Greg55_99 is offline
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Six speed Supra boxes are completely different and won't interchange.

Greg
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