AR-5, r-154 Anybody actually done this

AR-5 is the Aisin designation, GM called it the MA5 and you can get them out of Sky/Solstice roadster's too. Definitely a cheaper option than the R154, but it's only rated for 260 ft-lbs of torque. Some info as well as vehicles they came in Aisin AR transmission - Wikipedia

The R154 I think is by far the most desirable option for this route, best ratios, strongest, most aftermarket for replacing parts or beefing it up further. The AR-5 would be next. I wouldn't even mess with an AX15, it's a truck transmission and more work than it's worth in fabrication. An 833 OD can handle more power, and they aren't all that much more expensive (I've bought a couple for $200), and have better ratios even if the spread is larger. And they bolt straight in.

I was considering this swap myself, but those were the issues that caused me to make the decision to go straight to a T56 (after saving more money). The 340 in my Duster is good for ~400 hp if not a bit more. The r154 would work, but by the time I found one and built it the cost would be pretty significant. The AR-5 probably wouldn't live. And if I have to convert to a hydraulic clutch and fabricate a crossmember already the additional fab work for a T56 isn't that bad. More expensive for sure, bellhousing costs a ton, transmission costs a ton, plus all the extras. But with a t56 magnum being good for 700 ft lbs I don't ever have to worry about engine upgrades. Plus, better first gear ratio (2.66 vs 3.75 for the AR-5 and 3.25 for the R154) and an extra gear! You can go 3.91's or 4.10's no problem and still cruise easy. Heck I got the .63 6th, with the .5 version you could go 4.56's.

Yeah this is the fun I have been looking into. Right now we actually have an A833 OD. However its missing a bellhousing. This is a 24 hours of lemons car after all. So the car needs to be worth $500. Granted the rust does a good job of that. Ill link some pictures below. The problem is that finding a decent price bellhousing has been a problem. We have $150 in our A833 and could probably sell it for $250. Now the Ar-5 is around and good news is people are pushing loads of power with them. Some are even using them behind LS engines. The 1jz and 2jz crowsd use them with 500-600hp. So our 150hp 318 should be a piece of cake. Heck the Colorado made 175hp. Not as much torque but still seems to be a pretty strong transmission.

This is going into a 72 Coronet and yeah that is a B-body but I posted stuff here to find information. Actually getting info here. Not hey just keep the 727. The problem is a $300 or more bellhousing with a fork, then $225 in some repoduction pedals. Add in all that linkage stuff for another $250. That is about $800 just to throw in an A883 OD. Not a bad way to do it but it leaves us with horrible gearing. I have been hunting for a non OD transmission to use but the cheapest one I saw was $750 without a bellhousing and was for an A-body. Plus 300 miles away. Still an option to go A833. Could convert to an external pull style slave. Seen this done using Willwood pedal,master and slave. Still would be better with a 3.55 rear end gear when using the OD. Right now we are on the 2.76 and even with the 245/40/15 tire its still not good. Might not even need to shift out of third.

So this is what brought up the idea of going to an ar5 again. I looked but then we got the A833 OD. Thought we could find a cheap bellhousing but that has not been the case. Figure I can get a Ar5 for $200 and a bellhousing from the pick and pull for about $50. Might even get it all from the pick and pull. Pull both and bolt what we need together and then checkout. So figure $250 into a transmission. Clutch and Flywheel will be simple using the dakota and a aftermarket clutch disc for the 26 spline input shaft. Starter would also be a dakota. Then just use a willwood pedal. Tho I kept a set of pedals from a Miata I parted out. Maybe mix and match some pedals. This could be figured out. But with the Ar-5 it has a internal slave cylinder that could be used as well. After that its a yoke and measure up the driveshaft. Make some homemade mounts and route the exhaust with the headers. Then make an adapter for the pilot bearing.

Now the idea is what car to get it from. The Colorados are sitting around $200-250 at loads of local junk yards. The Solstice and Sky are sitting around $500 with a few at $450. People in the is300 forums prefer the truck unit for shifter location. Also they are easier to find. So decesions to be made. Gearing is about the same. I actually have been playing in Forza on the Xbox with a very low powered car. Can enter the gear ratios and see how they all drive with our rear end and tire size. Not perfect but it helps. Just have to stay away from the 07+ update on the trucks. So 05-06 only. Still loads of those around tho.

Add to the r154. Great transmission but prices have gone threw the roof. Cheapest one for sale was $1200. So it seems that market is just like non overdrive a833 4spd. Making this idea go right out the window. T-56 have done this. I have a Lt1 car with a t-56. Could probably get 2k for that transmission is built. Why back to the Ar-5

Pictures of the car

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