203 to d20

[ERLYBRONCKILLER]

does anyone know if there is a way to mate a dodge 203 range box to a d20 without the expensive wild horses adapter?
Thanks EBK

 

[bax]

you could use someone elses expensive adapter. you need the adapter kit to make it work.

bax

 

[bmc69]

you could use someone elses expensive adapter. you need the adapter kit to make it work.

bax

LOL..or you could mate it to a 205 instead..a $780 adapter kit. At $550 bucks, the WH 203/D20 package is one of the cheapest there is for making up a doubler.. Notice the custom machined shaft in that kit? That alone is a very pricey item...

 

[BUCKETOBOLTS]

I've been shopping the doubler kits myself. Some respline the old 203 output, and others have a new billet output. This can add $100-200 to the price of an adaptor. I've not decided if the billet shaft is necessary or not. I talked with Jed's machine and he sells both. He also told me that he has never heard of a resplined shaft giving trouble.

 

[crawln68]

I had Jeds respline my 203 shaft and I bought the 2 adapters from him too. He's a great guy!

 

[Past_Miner]

you could use someone elses expensive adapter. you need the adapter kit to make it work.

bax

Or if you have the tools and skills you could build your own expensive adapter. Somehow you need to get the output of the 203 to hold the input gear for the D20. You pretty much need to have that modified shaft. About the only two options are to buy one of the kits ot build your own pieces. Either way, it's expensive.

 

[ERLYBRONCKILLER]

How much does jeds charge for a whole kit? I have a dodge 203 range box in route right now. I don't know if it has the output shaft but it better. Also how much does jeds charge for an adapter if he resplines my shaft? Thanks for all your help. EBK

 

[ERLYBRONCKILLER]

How much does jeds charge for a whole kit? I have a dodge 203 range box in route right now. I don't know if it has the output shaft but it better. Also how much does jeds charge for an adapter if he resplines my shaft? Thanks for all your help. EBK

I forgot to add. I don't need the 435 to 203 adapter I already have that. Just the 203 to d20 kit.

 

[Past_Miner]

I forgot to add. I don't need the 435 to 203 adapter I already have that. Just the 203 to d20 kit.

Does your 435 output shaft have the correct splines for the Dodge 203 input gear? The WH kit includes a resplined main shaft for the 435 that fits into the Dodge gear. I don't know the spline count of the 435 off hand, unless it is a 4x4 version. If that's the case it will be 31 spline and you will need the input gear from a ford 203. Also, a Ford 203 will bolt directly to that transmission. I think the Dodge gear requires a 23 spline input shaft, but don't quote me on that.

I was being a wise ass earlier about making your own adapters. The only reason I did it was because I have a ZF5 and WH wouldn't split that main shaft out of their kit at the time. My friend has a 435 in his rig so the whole kit was required. It's a quality product that I would recommend if you have the 4x2 435.

 

[ERLYBRONCKILLER]

Does your 435 output shaft have the correct splines for the Dodge 203 input gear? The WH kit includes a resplined main shaft for the 435 that fits into the Dodge gear. I don't know the spline count of the 435 off hand, unless it is a 4x4 version. If that's the case it will be 31 spline and you will need the input gear from a ford 203. Also, a Ford 203 will bolt directly to that transmission. I think the Dodge gear requires a 23 spline input shaft, but don't quote me on that.

I was being a wise ass earlier about making your own adapters. The only reason I did it was because I have a ZF5 and WH wouldn't split that main shaft out of their kit at the time. My friend has a 435 in his rig so the whole kit was required. It's a quality product that I would recommend if you have the 4x2 435.

I haven't got the 435 yet. I have a guy who is sending me a dodge 203 range box with an adapter to mount it to a 435 so I figured Id wait to see what splines i'll need once I get it. I hope that all I need to worry about is the output spline on the 435 because I know dodge and ford 435s will work in the bronco I just don't know wich ones yet but I do believe this will work. I just emailed jeds to see about the 203/d20 adapter so I guess I will wait to see how much they want.

 

[crawln68]

How much does jeds charge for a whole kit? I have a dodge 203 range box in route right now. I don't know if it has the output shaft but it better. Also how much does jeds charge for an adapter if he resplines my shaft? Thanks for all your help. EBK

I would call and talk to Jon. He is a really nice guy and will explain everything to you. www.jedsmachining.com. Tell him that Patrick from CA says "Hi".

 

[Past_Miner]

I haven't got the 435 yet. I have a guy who is sending me a dodge 203 range box with an adapter to mount it to a 435 so I figured Id wait to see what splines i'll need once I get it. I hope that all I need to worry about is the output spline on the 435 because I know dodge and ford 435s will work in the bronco I just don't know wich ones yet but I do believe this will work. I just emailed jeds to see about the 203/d20 adapter so I guess I will wait to see how much they want.

All of the 203s will work. The Ford box has the late model 6 bolt round mounting flange drilled into the face of the box. It also has the 31 spline input gear. The Ford box also has a driver side shift lever that can interfere with the D20 shift rods, so it sometimes isn't the best choice when mated to the D20. The extra width of an NP 205 usually solves the shifter problem. You could also use a cable actuated shifter and make it work, but that could get pricy by the time you find high enough quality cables to actuate a D20.

I have a picture of a Ford, Dodge and GM 203 side by side. Sorry for the glare. The second picture is a closer shot of the Ford and Dodge boxes. You can see the different shape of the Ford box and the different side shift assemblies. The back side of the boxes are identical so any adapter plate for a 203 to whatever would fit any of the boxes. The Dodge and GM boxes are identical except for the spline count on the input gear. Also, all of the internals from any of the boxes will fit in any other

 

[Past_Miner]

I would call and talk to Jon. He is a really nice guy and will explain everything to you. www.jedsmachining.com. Tell him that Patrick from CA says "Hi".

Looks like a great vendor. I'm in the market for another doubler in the future.

 

[ERLYBRONCKILLER]

203/20

I would call and talk to Jon. He is a really nice guy and will explain everything to you. www.jedsmachining.com. Tell him that Patrick from CA says "Hi".

I called and talked to Jon and he said he never messed with the 203 to D20 only the 203/205 and 300. Did you have him respline the 203 of yours for the D20 or 205? He told me he doesen't make any adapter for the d20 at all

 

[crawln68]

Mine is the 203/205 and I had him respline the 203 shaft to fit the 205 input. I wonder if he would make the first D20 adapter for you? Then he could market it to us in the EB crowd.

 

[ERLYBRONCKILLER]

203/20

Mine is the 203/205 and I had him respline the 203 shaft to fit the 205 input. I wonder if he would make the first D20 adapter for you? Then he could market it to us in the EB crowd.

I tried to get him to do just that but he doesn't think there is enough demand%) O well looks like i'm stuck buyen the hi $ WH adapter. I think I'll try calling AA to see what they can offer.

 

[Madgyver]

I had Jeds respline my 203 shaft and I bought the 2 adapters from him too. He's a great guy!

Same here......
He also took the rear output shaft of the NP435 and cut it down for me...

 

[Madgyver]

I called and talked to Jon and he said he never messed with the 203 to D20 only the 203/205 and 300. Did you have him respline the 203 of yours for the D20 or 205? He told me he doesen't make any adapter for the d20 at all

Keep in mind that if you do a 203/D20 you will need to beef up the output shaft of the D20 and that's another $400.

 

[ChrisinWV]

that, and a lot of gentle prodding from Bill, is what sent me down the 205 road.
Overall, with the shaft upgrade the D20 doubler would have cost me more and still not been as strong as the 205.....
Good luck with yours.

 

[SaddleUp]

Is there a reason you are really stuck with doing it using the Dana 20? Even if you beef up the output shaft on the Dana 20 it still will not match the strength of the 203/205 combination. As far as cost the beefed up output shaft alone for the Dana 20 will cost 2 to 3 times as much as a NP205 case. In the wrecking yards they sell for about the same $ as the Dana 20. And FWIW here is a picture of a Dana 20 where the output shaft made no difference.

Not sure what Jeds is charging now but he charged me $450 for the 203/205 adapter which included the resplined shaft. I've beat on mine pretty hard and it has held up just fine.