NP208 cases--interchangability??

[diesel4me]

I was junkyard shopping again yesterday--since I think my NP208 case in my diesel is stuck in 4wd,I thought it might be wise to look for a spare in case mine craps out this winter when plowing,before the snow comes and makes removing anything at the boneyard a real hassle.I saw at least 20 trucks with either a NP208 or NP241,but most of them were attached to a 700R4 overdrive,or a SM465--mine has a TH400--I know the splines on a 700R4 are smaller,but what about the 4 speed ones???--will one from a 4 speed fit the TH400??--or can I change the input shaft??(last resort--I dont like playing with needle bearings!).Or should I get an adaptor for the 205 I will be pulling from my 74 K20??(probably expensive and hard to find right??plus mine is a TH350 version--wont work due to the smaller splines like the 700R4 right??)Can someone clue me in on this?? /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/ears.gif /forums/images/graemlins/ears.gif

 

[Hossbaby50]

SM465 = TH400 = 32 spline
TH350 = 700R4 = 27 spline

You can use the TH400 cases behind a SM465, you will have to swap input gears to run a case from behind a TH350 or 700R4.

A 241 from behind the 465 or 400 will work too.

Harley

 

[pauly383]

In 1980's GM's with passenger side front outputs , they will all interchange in the case , the difference is in the input shaft , 27 spline for th350 and th700r4 , 32 spline for th400 and sm465 . So to run the different cases in different applications will require swapping the input shafts , which isn't too hard /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif

 

[diesel4me]

Thanks for the info!!.I might go back and see how much they want for the whole 4 speed setup--I might be able to get it for about 200 bucks including the case--they are squashing everything like crazy here--over 4 acres of trucks like mine at this yard have gone to the crusher in the past 3 weeks--including an 82 K10 with a 6.2 and a SM465 and NP241 t-case--they offered it to me for 500 bucks as is,whole truck--but no title and they bashed it all in with the loader--two days later I went back,and it was at the bottom of a pile of crushed cars and trucks--guy said they can get almost that much for scrapping it--so I lost out! /forums/images/graemlins/doah.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/screwy.gif