NP205 Swap

[dyeager535]

"But yeah, I could throw 10 degrees of shims and a new CV slip yoke shaft at it and it would probably be okay, just not as good as it could be."

I seem to be the only one harping on it, maybe I'm full of it. If you are running excessive driveline angles and/or the angles are mismatched, the only true way to fix it (that is normally an option) is to CV the shaft.

From the above comment, I am under the impression the thought is that running a fixed yoke alone will somehow make things better in that realm. Fixed yoke is better if you break something in the back of course, but for fixing a u-joint angle problem by itself, no way.

 

[Mastiff]

I do already have a CV, but it's too short now anyway. But the angles will surely be shallower if I shorten the case by 6", plus get rid of the 2" of slip that has to stick out. Same rise, longer run means shallower angle. I made up those numbers, but ballpark.

 

[wasted wages]

If you can find a pair of 1410 yokes to fit the 205 ( you will also need a 32 spline front output shaft from a ford case ) it will give you the highest angle u-joints you can run without running a CV. They will run up to 37 degrees angle.

Plus they are pretty much bomb proof...

I run 1410's on my 205/14 Bolt/D60 combo with a 4" lift and a doubler. The shaft angles on a 79 K5 frame ( truggy) are a little steep but the 1410's have held up with no issues so far....

 

[Mastiff]

If you can find a pair of 1410 yokes to fit the 205 ( you will also need a 32 spline front output shaft from a ford case ) it will give you the highest angle u-joints you can run without running a CV. They will run up to 37 degrees angle.

Plus they are pretty much bomb proof...

I run 1410's on my 205/14 Bolt/D60 combo with a 4" lift and a doubler. The shaft angles on a 79 K5 frame ( truggy) are a little steep but the 1410's have held up with no issues so far....

Is there a downside to CV, besides price and a little weight? I was planning to just stick with that.

 

[82355]

Hard to grease.

Martin

 

[sweetk30]

( you will also need a 32 spline front output shaft from a ford case )..

divorced cases run 32 spline all 3 shafts .

 

[Mastiff]

Well, it's looking mean with the new axles and springs, tires poached from my CUCV. Never mind it has no front driveshaft and the rear would shake to pieces at speed.

 

[sweetk30]

mmmmmmmmm sexy

 

[wasted wages]

Is there a downside to CV, besides price and a little weight? I was planning to just stick with that.

With the 1410...
I can carry 1 spare u-joint for both driveshafts....
But then again.... Being bombproof,,,,something else will most likely snap first...

 

[Mastiff]

I'm going to ask some stupid questions. What is the function of these adapters? As far as I can tell they are just taking up space and providing a mounting location, not really "adapting" anything, at least not anything major like the spline count. Is that right?

Also, since there's an adapter anyway, is it possible to adapt my TH400 to a figure 8 NP205 just using a different adapter? Thanks.

EDIT: Like this?

 

[USSkoval]

The adapter is needed so there is some way of bolting the t-case to the trans, it has the trans bolt patter on one side and the t-case bolt pattern on the other side.

 

[sweetk30]

you can use any 205 with the 32 spline input .

but the fig 8 is short length input gear and round 6 is long input gear.

your current tranny tail shaft will only take the round 6 with the long input gear.

if you tear apart the whole tranny to swap just the tail shaft then yes you can use the fig 8 adaptor style 205.

 

[Mastiff]

It seems more realistic to swap the input shaft on the 205 though. Is it possible to get a fig-8 205, replace the input shaft with a long 32 and then use a 6 to fig-8 adapter? ORD appears to have shafts for sale, but I'm not sure about the adapter. It would have to be the right bolt patterns and right depth.

The only reason I'm asking is because the round-6 looks hard to find, but the fig-8's (especially with 10-spline) show up often. The cost of this stuff will probably deter me anyway, but I'd like to understand at least.

 

[sweetk30]

10 or 27 spline will need case gutted and machined for bigger input gear bearing size.

yes you can swap inputs on them . it don't care until you try and bolt stuff up and find out there is different spacing needs.

 

[sweetk30]

http://www.ebay.com/itm/NP205-GM-Tr...Parts_Accessories&hash=item43c3dd442b&vxp=mtr

http://www.ebay.com/itm/CHEVROLET-N...Parts_Accessories&hash=item1e8542a7c4&vxp=mtr

http://www.ebay.com/itm/chevy-400-2...Parts_Accessories&hash=item25877d15a8&vxp=mtr

yes harder to find . but there wanted more cause the case goes right on nv4500 trannys so easy .

and only made them for 1ton's and 85-91 style .

 

[Mastiff]

Got it, thanks. That one on ebay has a slip yoke... not that I'd be willing to pay $400 or drive to Michigan to get it anyway.

 

[sweetk30]

I know . just quick search and found it .

guy nere me has a rollin frame and I think its got one . its a 85 .

if the deal was right I might be able to get it .

 

[Mastiff]

I know . just quick search and found it .

guy nere me has a rollin frame and I think its got one . its a 85 .

if the deal was right I might be able to get it .

You're east coast? I'm afraid shipping would kill the deal even if it was a bargain on your end. If you learn any more though, let me know.

 

[77_Jimmy]

http://www.offroaddesign.com/catalog/transfercaseparts.htm

 

[rksjd8420]

It seems more realistic to swap the input shaft on the 205 though. Is it possible to get a fig-8 205, replace the input shaft with a long 32 and then use a 6 to fig-8 adapter? ORD appears to have shafts for sale, but I'm not sure about the adapter. It would have to be the right bolt patterns and right depth.

The only reason I'm asking is because the round-6 looks hard to find, but the fig-8's (especially with 10-spline) show up often. The cost of this stuff will probably deter me anyway, but I'd like to understand at least.

CUCV's that use the NP205 (like the M1031) use the long input in a figure 8 NP205. They use the same 2.375" output TH400 as the TH400/NP208 and the same adapter as the civilian mid 85 and older TH400/NP205's.