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Np 208 with big lift and tires question

M

muddy ballz

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May 15, 2007
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Location
miami, fl
I have an 87 k5 with ~14" of lift. I'm running 49" tires on a Dana 60/ 14 bff combo. I have a 700r4 tranny mated to an Np 208 transfer case. I've been told by a few people locally that the Np 208 transfer case will break before I can even make it to the first mud hole. The truck is going to be ran primarily in mud. Does anyone have any feedback on this? The transfer case was broken open when i first bought it from a junk yard. It had been freshly rebuilt and hasn't been ran since then. I was told that under acceleration the rear slip yoke would bind and break off the rear section of the transfer case.
 
thats pretty damn tall for a short wheelbase rig like a k5.

can you even turn the driveshaft at that type of angle, is it binding at ride height?
 
muddy ballz said:
I have an 87 k5 with ~14" of lift. I'm running 49" tires on a Dana 60/ 14 bff combo. I have a 700r4 tranny mated to an Np 208 transfer case. I've been told by a few people locally that the Np 208 transfer case will break before I can even make it to the first mud hole. The truck is going to be ran primarily in mud. Does anyone have any feedback on this? The transfer case was broken open when i first bought it from a junk yard. It had been freshly rebuilt and hasn't been ran since then. I was told that under acceleration the rear slip yoke would bind and break off the rear section of the transfer case.
Click to expand...

Well I broke my 208 with 4" and 37s but I had the full weight of my K5 come down on the rear shaft which killed the slipyoke, broke the shaft, bent the Tcase output and cracked the case but the end of the Tcase did not fall off.

Pics here

With 14" and 49 on a 60/14FF the Tcase is the least of your worries in my opinion.

Dik
 
muddy ballz said:
what would you say is the most of my worries then?
Click to expand...

I would be worried about busting shafts in the axles. Willyswanter ran 47s with Chromo shafts and was beginning to twist splines before he switched to Mog portals.

49s are a big tire for 1 ton axles in a full bodied K5.

Dik
 
I agree that the 208 will break in short order. It won't only break because its a light duty case in a heavy duty application (it would) but more so because you have 14" of lift on a slip yoke transfer case. The driveshaft will put tons of stress on the output of the 208 which is notorious for breaking in this manner with any lift. Slip yokes don't have any give in the up/down direction, steep driveshaft angles add lots of load to the (aluminum) housing in a way it wasn't designed for and they break.

Its a miracle you got a slip yoke driveshaft to not bind in the first place.

The second thing to break will be the 700R4.

Then everything in the front 60.



Good luck ;)
 
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