Hey guy picked me up a 91 Cummins for my 78 4x4. Would I be better running the 518 trans. Or getting adpteer for the c6. Also does the engine clear the engine bay without any mods to the fire wall

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anybody? don't all speak up at once

 

Ok for 1, Do you have a shortbed or long bed, And do you have any kind of body lift? And Ac or not. I can say I think the adapter for the C6 is garbage. Both kits require you to hack up the bell housing to clear the flywheel and the nose cone of the starter. Also the C6 shifts by vacuum. The diesel produces boost. American Thunder on here came up with a great way around that. But for me I wanted it simple. I went with the stock diesel 727 auto tranny thats on the cummins. Why?? Because its just about the same gear ratios as the C6,And its made for the diesel. The ONLY problem was the ford 205 transfer case mounting to the 727. BUT there is an adapter for that which I used,Direct bolt up from advance adapters. 50-0207 : Dodge NV4500 4wd with 23 spline output shaft to Ford NP205 transfer case. | Advance Adapters . Easy to do. And a body lift helps,but not required. As for Ac,I modified my pass frame to clear the Ac compressor. Look on one of my post to somebody a couple of days ago. You can see my frame and how the engine sits and all. Any questions just ask.

 

I agree with what ^ said.

 

It's a long bed with out ac and no body lift. Well I seen 5hose adapter but am more worried about the dodge transmission reliability. Does the 518 require any kind of control module for the transmission?

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Mud driver mike which radiator did u use

 

I am using a stock replacement radiator for the bronco..I had the copper and brass years ago but it went bad. Its a 2 row plastic and aluminium radiator. If Im correct the A518 is just like the 727 except it has overdrive. No computer. Just a cable that goes from the injection pump to the lever on the side of the trans for right time for the gears to shift. Think of it this way the trans that came on the diesel were made for it. So they shouldnt have an issue holding up to the diesels. Keep in mind the gas versions of these transmissions will NOT hold up to the diesel. They do share some parts inside but the diesel trans are stronger and the bellhousings are different.

 

This transmission is supposed to have 10k miles on it since rebuilt. I have no way to prove that but it is painted like it was out of the truck. And after you used the adapter for the 205 how did you mount your transfer case mount

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Also did you run a floor shift to the transmission or was there a way to hook up the stock to it

 

I actually flipped my T case mount. The way I did everything, My case sits in the EXACT place as factory,just a couple inches higher. And I used the 727 mount and bolted it to my C6 mount and made new holes to the cross member. The 727 came with a 205 on it in the dodges but the front shaft is on the pass side of the axle. Also the 727 trans had a male shaft that plugged INTO a sleeve that stuck out of the dodge 205,while the fords have a female input. The Advance kits has a spacer and stub shaft that plugs onto the 727 trans tailshaft and into the 205. But you have to cut about 3/4 inch or so off the end of the 727 tailshaft. No big deal. I have a B&M shifter on the floor. The shifter pattern is backwards compared to the C6. I made a reversible linkage for it originally but I couldnt get the column to line up and could not tell if I was locked into the correct gear..

 

Before I forget. Since I have a shorter wheelbase,I had to shorten the trans. I replaced the diesel tailshaft and housing with a shorter one from an older full size jeep. Same splines and bolt patterns,Just shorter. Because of that,That is why my T case is in the same spot. I did not have to do anything to my driveshafts but bolt them up..you could do the same with the 727. I think the 518 is longer. So you would have to shorten your rear and get a longer one for your front.

 

Looks like that worked out pretty good. I know the adapter that's on mine is way longer than the one you got. Idk if the transmission itself is longer or not. I will have to look into that.

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Was you able to run you stock ignition switch to the Cummins

 

Yeah the stock ignition is fine. The only thing that needs power is the shut off solenoid and the timing advance solenoid,which run off the same wire. The wire from the truck I used was the positive that originally went to the coil, the only other wiring you have to do is wire up the alternator to the truck. I have a diagram that shows me how to do that. It works fine. I think I got the diagram from American Thunder. But have it stored in my computer for the future. And for my sensors I bought the "Bushing" kit from fordcummins.com . That worked nice also