Adapter need for np435 to Dana 20 ??????

[StrongCo]

I have an np435 (w/ the 6.7:1 1st gear) out of a 1986 F250 4x4,

What would be needed to bolt my 1977 EB Dana 20 tcase up to it?
i.e. adapters either factory or aftermarket?

I hope your replies are just:

"Wrenching, elbow grease, some cursing and a case of your beverage of choice! ;D "

But somehow I doubt it's that simple given patterns and spline counts - anyone know?

Thanks.

 

[brewchief]

You'll need an aftermarket adaptor and I'm pretty sure you'll need to swap tailshafts, the dana 20 uses the same spline count as the 2wd tailshaft. Pretty much any bronco vender can set you up with everything you need. search np435, you'll be reading all night

Brewchief;D

 

[Devin]

From the tech pages:

http://classicbroncos.com/tranny-np435.shtml

 

[broncnaz]

More than likely you have the wrong 435 for a bronco swap almost all 4x4 trannys have 31 splines you need a 28 spline tranny that found in most 2wds although you still have to check as some 2wd wll also have 31 splines. With your current tranny you need to swap out the output shaft. Check the venders sites for adapters there are at least 3 different types availible. I'd personnally find the correct tranny for the swap as buying another output shaft and a adapter will run up the cost you could probably trade your 4x4 tranny for a 2wd tranny.

 

[StrongCo]

Thanks to All... I'll pull the np435 and check

 

[Broncobowsher]

Actually you could use the ZF adaptor to put the 4WD version of the NP435 in front of a D20. That adaptor can be used for most any full size 4WD transmission. There are a few downfalls. I doubt that it keeps the driveshaft lengths the same like the normal 2WD transmission swap would. You would need to come up with your own version of a crossmember as the original will not be a bolt in like the 2WD version would. But the upside is that you could use the same adaptor later to istall any number of tranmissions. All it really does is give a new face to the D20 to make it look like a full size transfer case.

 

[Dave]

Actually you could use the ZF adaptor to put the 4WD version of the NP435 in front of a D20. That adaptor can be used for most any full size 4WD transmission. There are a few downfalls. I doubt that it keeps the driveshaft lengths the same like the normal 2WD transmission swap would. You would need to come up with your own version of a crossmember as the original will not be a bolt in like the 2WD version would. But the upside is that you could use the same adaptor later to istall any number of tranmissions. All it really does is give a new face to the D20 to make it look like a full size transfer case.

Second that. Here is a picture of what the ZF adaptor looks like on the D20. The adaptor runs about $370. You might have to fabricate a shifter bracket. The adaptor comes with a spud shaft that accepts the 31 spline output shaft. A sealed bearing, gasket, bolts, snap rings, seals, etc. I adds about 1 3/8" to the length of the D20 and makes it look just like a NP205,208,BW1345, etc to the tranny. I will also bolt up to the 4R70W 4X4 tranny. Gives you some clocking options too.

http://bcbroncos.com/store/product_info.php?products_id=173

 

[StrongCo]

That is very interesting...So then which Factory "apater is used between the np435 and the new D20 w/ ZF "face"? -- I guess what I am asking are there changes still req'd to the output shaft of np435? Is there an intermediate shaft between np and zf-faced D20?
Thanks.

 

[broncnaz]

With the ZF adapter you can keep the current 4x4 adapter thats on the NP435. So no changes to the NP output shaft. To make this work you'll need the adapter pictured and the spud shaft in the center of the adapter. This will run you about $500 a little more than most NP435 adapters. Then you'll still probably have to fab up a new crossmember as the stock NP435 adapter is different. I'm also not sure on the total lenght as it seems there are at least 2 different adapter lenghts with the NP435 a long and a short + the ZF adapter But I dont think the differance is all that much. so more than likely you may have to lenghten at least 1 driveshaft. All in all it would work but I still think finding a 2wd version would be easier and cheaper all around.

 

[Madgyver]

Using the correct NP435 from a 2wd will be cheaper but for what you got you could also do this for a few hundred more in adaptors and correct shafts....
It also helps if you already have the main parts at your disposal...

It is a Ford NP435 / GM NP203 / Ford NP205..

There are kits available that also mates the 203 to a Dana20..

 

[nyhillbilly]

if your looking to do it on the cheap, you can bolt a np 205 and it will bolt right up to the tail shaft you already have, you will have to notch the tail shaft to clear the shifter linkage, and fab or modify your tranny cross member. not really sure about the drive shafts. it all depends on what your wanting .

 

[StrongCo]

With the ZF adapter you can keep the current 4x4 adapter thats on the NP435. So no changes to the NP output shaft. To make this work you'll need the adapter pictured and the spud shaft in the center of the adapter. This will run you about $500 a little more than most NP435 adapters. Then you'll still probably have to fab up a new crossmember as the stock NP435 adapter is different. I'm also not sure on the total lenght as it seems there are at least 2 different adapter lenghts with the NP435 a long and a short + the ZF adapter But I dont think the differance is all that much. so more than likely you may have to lenghten at least 1 driveshaft. All in all it would work but I still think finding a 2wd version would be easier and cheaper all around.

Thanks. This probably the way I'll go...Although the 203/205 is desireable I do not have either a 203 or 205 (If someone has them let me know and I'd consider)

Fabbing crossmember and shafts are required anyway since I'm stretching the rear ~3in and fabbing a custom 4x2x3/16 chassis anyway.

Thanks.

 

[StrongCo]

Using the correct NP435 from a 2wd will be cheaper but for what you got you could also do this for a few hundred more in adaptors and correct shafts....
It also helps if you already have the main parts at your disposal...

It is a Ford NP435 / GM NP203 / Ford NP205..

There are kits available that also mates the 203 to a Dana20..

What or who's product is needed to go Ford np435 (4wd) to GM np203
(specifically just adapter or do I need to mod the output shaft of tranny)

A few hundred is not the deciding factor - I want to not open up the np435 (the 4wd that I own) and prefer to keep the D20 due to better low range ratio over np205.

Sitting ahead of the np435 is my Cummins 4bt - any comments on D20's ability to handle a 4bt (130hp ~300ft-lbs) 85% of torque is there at ~1500 rpms

 

[Dave]

What or who's product is needed to go Ford np435 (4wd) to GM np203
(specifically just adapter or do I need to mod the output shaft of tranny)

A few hundred is not the deciding factor - I want to not open up the np435 (the 4wd that I own) and prefer to keep the D20 due to better low range ratio over np205.

Sitting ahead of the np435 is my Cummins 4bt - any comments on D20's ability to handle a 4bt (130hp ~300ft-lbs) 85% of torque is there at ~1500 rpms

The NP 205 is stronger and probably cheaper than an adaptor kit. That lower gearing might not be necessary on an engine that makes all that torque at lower rpms. Plus, that 4X4 np235 has a 31 spline output shaft.

 

[StrongCo]

The NP 205 is stronger and probably cheaper than an adaptor kit. That lower gearing might not be necessary on an engine that makes all that torque at lower rpms. Plus, that 4X4 np235 has a 31 spline output shaft.

All great input - so is there a factory combo I can look for that had the zf 5-speed and np205?

Worst case is I can run the zf w/ the $370 D20 adapter. I am abondoning the 4wd np435 at this point.

 

[StrongCo]

also FWIW - the 4BT has/had a Ford T-18 (10-spline, I'll measure the shaft Dia.)

Should I be looking for the 4wd ZF from the 351? or from the 302?

 

[Dave]

All great input - so is there a factory combo I can look for that had the zf 5-speed and np205?

Worst case is I can run the zf w/ the $370 D20 adapter. I am abondoning the 4wd np435 at this point.

You will be much happier with the ZF than the 235. The OD will help keep the revs down on the road and having all gears synchroed is nice. I drove a 435 on my big Bronco for about 18 years before I swapped it out with a ZF. I think you will only find the ZF with bigger transfer cases that are too wide but the 205 will bolt right up to the ZF.

 

[StrongCo]

You will be much happier with the ZF than the 235. The OD will help keep the revs down on the road and having all gears synchroed is nice. I drove a 435 on my big Bronco for about 18 years before I swapped it out with a ZF. I think you will only find the ZF with bigger transfer cases that are too wide but the 205 will bolt right up to the ZF.

Yeah - the more I though about it I completely agree - so which ZF do you think?

 

[Dave]

That would depend on adaptors available to the Cummings.

 

[StrongCo]

Cummins adapter that is currently installed makes it setup for Ford v8 pattern - anything specific I should measure/inspect from the T18? splines, lengths...etc?