need trany t case help??????

[IWantATurbo]

truck below

it has a getrag 5 speed and a ford transfercase

its like it comes out of gear then goes back in on its own. makes a sweet grinding noise when it does it. does it mostly in the morning when its cold or the oil is not all stired up? i did not put the stuff in i got it this way? im pretty sure its in the t case but what could be going wrong?

i though it was poping in to N in the t case so i put a strap on the leaver so it can't move. but it is still doing it?

any help????
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1983 F-350 Crew cab 4x4 4.10 5 speed 90 cummins 12v, turned up pump, centerforce clutch, stright piped stack on its way.,97 alcoa ford wheels, with custom built flatbed 265 85 16s running on 50% UMO

 

[Shocker]

Any idea what transfer case it is? If it's a 1356 they had a TON of issues with the planetary units coming apart and they'll free wheel when you get outta the gas. Easiest way to tell is put it in low range and see if the problem goes away. When you do that it drops the reduction hub into the planetary unit and locks it up. Let me know if that fixes it, i got a ton of parts for those here at my shop if you need any.

 

[IWantATurbo]

im pretty sure its not that t case? its teh stock case out of the 83 f350 i pretty sure its a good one npt 205 or somthing like that?

 

[Shocker]

Aluminum case or cast iron case?

 

[IWantATurbo]

it is a Aluminum case

 

[Pimp Daddy]

Then it ain't a 205, them bastages are cast iron and freakin heavy. If it's aluminum it will probably be the BW 1356. Shocker is right, it's probably in the planetary set. Try it in low and see if it still happens. Also does it happen in all gears?

 

[TBWdracula2003]

ive never had any trouble with my BW1356 (85 f-250 6.9l) but ill keep an eye on it ill try not to pull half a cord of wood at once out of the woods

 

[IWantATurbo]

so how do i fix it? can i fix it with out taking it out? or do i have to just put my spare one in?