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The first item on the "agenda", this blog is for the Chrysler A833 Conversion, and I will not tolerate entries on any other trans conversions without my explicit permission. This blog is purchased by me, and will be managed for content entry by me, so if you want to debate, argue, criticize go elsewhere or start another blog.

The essence of this Blog, is a Mopar for Mopars solution, and I will ask all entries to respect this, or posts will be deleted.thank you.


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Okay,so this Blog will document, outline and detail a Chrysler A833 Overdrive Transmission swap into a 1955 Fargo pickup truck.

This truck has a 228 Canadian Long block engine, dual Carters B&Bs, and dual exhaust.

The bell housing is the heavy duty type for 4 speeds with the bigger bolt pattern.

My current differential is a Chrysler 8 1/4 open drive with 3.23 gears

Tires are P 235 75 15

The donor transmission is a Chrysler A833 4 spd Overdrive, 23 spline input shaft, aluminum case cast iron tail shaft and 30 spline output shaft, shifter is the infamous Hurst shifter, a factory stick.

This trans is from a 1979 Dodge pickup truck.

The "Adapter" plate is courtesy of AoK Racing.

The new clutch disc, and rebuilt pressure plate will be supplied by Quality Brake and Clutch in Winnipeg Manitoba.

The trans will be going to a very reputable and qualified local trans builder, where it will get inspected, and any item that may be necessary will be replaced, but these transmissions are truly a "bullet" proof wonder, most likely will need gaskets and seals, and the very most shaft bearing sets.

I have a donor drive shaft, fresh u-joints, and will be going into the final phase of this swap in the very near future.

I invite all those interested or experienced in this conversion to join in, also a very friendly welcome to any who are just wondering or may be considering a trans swap, but want to look into all options before making uninformed decisions.


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Here is a You Tube video of my truck with the T98 Acme trans 3.23 Mopar 8 1/4 diff.

For illustration purposes, this trans from 2nd to 4th, has a gear spread the same as the A833 from 1st to 3rd.

Basically it's 1st 3.09, 2nd 1.69, 3rd 1.0

Now even with a 3.23 rear gear, this trans is more than adequate in the gear ratios and spread, a gear spread and ratio with higher numbers, for example a 4.03 1st, and a 2.37 2nd and 1.49 3rd, would have you shifting almost immediately from 1st to 2nd, and not overly long till you hit 3rd, not my idea of fun.

There are others for example, 3.67 1st, 2.19 2nd and 1.39 3rd would be better, shifting from 1st to 2nd would be pretty quick.

Add 3.55, 3.73 or even 4.11 gears, and 1st is useless altogther in some cases.

Here is a short video,


Edited by 55 Fargo Spitfire

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1 hour ago, Brettwg said:

How much was the conversion plate?

Hello, I did not produce the "plate", contact Tim Kingsbury on this forum via PM, but a heads up, think they are sold out currently....

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Thanx Tim, most likely will focus on this Blog Topic, and some others relating to Hi Perf Flathead topics.

I am currently not participating in the "Open Forum", where some people with a specific agenda continue to berate and question why A Mopar freak wold want a Mopar solution for an overdrive trans.

The last weeks issues regarding the AoK Adapter, was the icing on the cake, and of course they had nothing to add in a productive way...

Edited by 55 Fargo Spitfire

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UPDATE 2018-01-03

Okay so another New Year has begun and its been quite a while since I updated this thread.

Been super busy with many other things, do now getting some time for this project.

Dropped off my A833 to a local trans guru yesterday.

This gent has a super large home shop he us a drag racer and predominantlya Chevy guy gor that stuff.

Last night got a call from him, he informed me all looks good but front inputshaft bearing and thrust washes seals gaskets etc.

He stated the gears looked great.

So next step is the clutch, but first have to pull trans and clutch from truck for rebuilding unless i can source new stuff first.

My clutch is not old so might just swap friction discs, as it all gets pulled again for the 265 swap.

Will post pics soon .

Circle the wagons T5ers A833 boys are riding into town.





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Hey all here is an update, unfortunately any and all further info on this swap will be contained to this blog, as troublemakers insist on sabotaging any open forum threads and dialogue.

UPDATE A833 Transmission Swap to  Chrysler Flathead 6 Cylinder Truck Application:

Early January, the A833 was rebuilt minus new gears, all in great shape and ready for the "trans plant".





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Last Sunday got ready and pulled the T98 Acme truck trans, no small feat in a home garage, no hoist, no trans jack.

Put front end of truck up on stands, pulled floor plate, and go to it, will not belabor the minor details.


Got the trans out, lowered to floor with a small floor jack some wood blocking and a small ratchet strap.


Once trans was out, 2 details, 1) the trans bolts are tapped 5/8 UNC, and adapter plate is designed for 7/16 holes and fasteners, nota big deal though as once the trans was pulled, my dual pattern bell revealed the smaller 4 pattern 7/16 holes, as is on the AoK adapter plate.

It attaches well as you will see in this picture.20180114_142640_resized_2.jpg.71cd8ac35f163e95c3b646284d0a45f6.jpg




Edited by 55 Fargo Spitfire

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So 1 noticeable issue, the T98 Acme, has a 13/8 input shaft, and the A833 is 1 inch, so at first thought, decided I would buy a smaller diameter release bearing and holder.

I thought about this some more, and decided to purchase a new larger release bearing SKF N1087, and use the correct size bronze bushing to reduced the entire throwout bearing for the A833 input shaft collar, it works like a charm. The bronze bushing reducer, is not pressed into the holder yet.

So next need a 23 spline 11 inch clutch disc in order to proceed in fit alignment etc, stay tuned...........





Edited by 55 Fargo Spitfire

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Here is a peak inside the old T98 Acme trans, BTW these transmissions were used exclusively on all Canadian built M37 Power Wagons, along with a 250 engine, and Acme PTO transfer case..

It looks not bad inside, it did have a little water in it, when I got it.. 

A very tough brutish trans, I  wonder how it made its way into my little 108 WB Fargo, I also had a 1955 Dodge 1 ton with an identical trans, so possibly in the C series trucks, Chrysler Canada had an excess of these and were using them too, I cannot verify this one way or another..




Edited by 55 Fargo Spitfire

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