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Discussion Starter · #1 ·
I have a 1984 W-100, 318, 727. 4x4. I would really like to have an OD transmission. What is the best tranny to use and what years am I looking for the donor tranny? How hard to hook up the existing transfer case? Any help would be appreciated.
 

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Before you consider an OD trans.....do you know what gears ratio you have in your diffs? If it is the typical 3.2 or even 3.5 an OD trans would mostly be a waste of time....especially since you want to increase tire size to 33's as your other thread states. With stock gears being so high, it's unlikely OD would be usable unless going downhill or 80+ mph.
 

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As said above a overdrive is completely worthless with all but one of the factory gearing options, 2.94, 3.21 and 3.55 with 33" tires and a 318 would be gutless, if it has the rare 3.91 then maybe a overdrive would be of some benefit.

Anyway you want a A-518 from a '90-93 W series for a fairly straightforward conversion, the transmission, transfer case and both driveshafts just for starters.
 

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3.55 is common factory gearing with OD, but I agree... Deeper would be better as the od is tall at 0.69:1.
 

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Discussion Starter · #5 ·
Thanks for the input. I don’t know what gearing is I’m my truck but it feels like at least 3.55s basted on the ones in my Cudas. It is screaming at 70. I have a 360 that I am going to put in the truck too, but tring to figure out the OD conversion.
So I am looking for a 90-93 W? Thanks.
 

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You should be able to make any 90-95 46rh/518 work. Some are lock up, some are not. Be a ton easier to find a 94-95 trans simply because they made twice the number of trucks as the 90-93s, for example.
 

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Discussion Starter · #7 ·
You should be able to make any 90-95 46rh/518 work. Some are lock up, some are not. Be a ton easier to find a 94-95 trans simply because they made twice the number of trucks as the 90-93s, for example.
Thanks for the reply! So, I guess the 46rh is in the 94/95 trucks? Will it mate to my 84 transfer case? I don’t think the later model TC will work right?
 

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Screaming at 70 with what size tires? I have 4.10s with no overdrive and it’s not what I would call screaming at 70
 

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Discussion Starter · #11 ·
So, I always thought the center section of a 94 up on the front diff changed sides or had a different offset than a 93 back. So a 94 up 46rh and tc will bolt up and line up with front and rear diffs on my 84?
Will the tc shift handle come through the floor correctly?
 

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The front differential switched from passenger's side to driver's in 94. 94 up Tcase wont work, but you may be able to bolt up the 94-95 46rh to an earlier 241.

Bucky
 
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