sm465 question

[64gmc1500]

i have an 84 k20 has turbo 400 with np208. i have a sm465 with the dana 20. will the sm465 i have work with the 208. i know i need the adapter but do i need to change anything else mainshaft etc. the dana 20 isn't useable anymore and the adapter was split in half from car a accident

[lukefalls]

Call Off Road Design. They'll know. Or check CK5.com or Pirate4x4.

Sorry, I don't know the exact answer you're looking for.

[Redcap]

Doubtful.

[Hoods69BadBowTie]

I don't think so either but not 100% sure on that.

[Redcap]

The NP208 from that TH400 should be 32spl female. I think the Dana 20 from the SM465 is 10spl male, though I could be mistaken on that.

[64gmc1500]

Originally Posted by Redcap

The NP208 from that TH400 should be 32spl female. I think the Dana 20 from the SM465 is 10spl male, though I could be mistaken on that.

the dana 20 was 10 spline and i believe the 208 is 32 spline, i have heard tht there is an adapter u can use to adapt the 10 spline to the 32 spline but cant seem to find one.

[Burt4x4]

No
Besides ~ the only thing I would put behind a SM465 is a NP205 or 205/203 doubler... all the rest just too weak!
My .02

[scottsdaleowner75]

NP208 and NP241 had WAY better crawl ratios and dont require you to be on the brakes constantly when going do large decents. Unless you of course run an 203/205 doubler setup. Which weighs a ton and requires driveline and crossmember mods. Didnt some applications have an SM465 and NP208 combo. Mid to later 80's I believe.

[duallyjams]

208 did come behind a sm465 and it would be a 32 spline ( my 84 3/4 had this combo )

[renegade6]

You could change the mainshaft in the 465. I have a 32 spline 465 shaft laying around.

[nelsonadam84]

Advanced Adapters have all the parts you will need to put the sm465 to the 208. As most 4x4 sm465s have short 10 spline, the later ones had a long long 32 spline. With the manual you could get away with a 205 gear reduction as the sm465s first gear is ultra low for pulling power which that low gear with the reduction is lower then the 400 with the 208s reduction.

[63chevyll]

Why don't you use a 205 behind the 465
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[Tex_50613]

Originally Posted by duallyjams

208 did come behind a sm465 and it would be a 32 spline ( my 84 3/4 had this combo )

I can conferm that, and currently have that combo setting in my trans rack rite now too, outa my 85 from when I swapped to a sm 465/np205 twin stick, the output shaft is about 12 inches long in the trans with that setup and has no shaft coller like the sm465/np205 uses, advance adapters may have something for the conversion but I just recomend scrapyarding it, a trans/t-case combo may be cheeper than the adapters. or atleast the proper trans and adapter that goes between them anyway.