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np205/np208 difference in them?
- Thread starter ed1507
- Start date
208 is a little bigger and chain drive i think.
K Cinco
Registered Member
208is also shift on the fly....if you have auto lockers.... where i dont think a 205 isshift on the fly ...and also not alum housing
TXsizeK5
1/2 ton status
not sure, but i think most 208 were slip yoke and more 205's were bolt one type. Im stupid though, so dont take my word for it =(
K5thatShmobs
1/2 ton status
you got it... 205s are fixed yoke and 208s are slip yoke...
208's are aluminum cased chain driven with a slip yoke.205's have a cast iron case and are gear driven some have slip yokes but most are of the fixed yoke design.low range in the 208 is 2.61 to 1 I think and the 205 is 1.96 to 1 /forums/images/graemlins/k5.gif
205: iron case, gear driven, fixed yoke rear output (unless its the freakish 1980 np205), 1.96 "low" gear.
208: aluminum case, chain driven, slip yoke rear output and a 2.7-something low gear.
the 208s low is nice, and the fact that its lightweight is nice too... the chain-drive system is debatable... what isnt debatable though is that slip yokes SUCK. Im ditchin my 208 for just that reason, the slip yoke is just a crappy design.
j
208: aluminum case, chain driven, slip yoke rear output and a 2.7-something low gear.
the 208s low is nice, and the fact that its lightweight is nice too... the chain-drive system is debatable... what isnt debatable though is that slip yokes SUCK. Im ditchin my 208 for just that reason, the slip yoke is just a crappy design.
j
Pookster
1/2 ton status
Can you acutally swap the output shafts to make the 208 into a fixed yolk? Just an ignorant question...
96chevy
Registered Member
[ QUOTE ]
205: iron case, gear driven, fixed yoke rear output (unless its the freakish 1980 np205), 1.96 "low" gear.
[/ QUOTE ]
Another annoying new guy question, but what do you mean by freakish 1980 np205? Is there a difference and if so how do you tell which one you have and what makes them different. /forums/images/graemlins/confused.gif
205: iron case, gear driven, fixed yoke rear output (unless its the freakish 1980 np205), 1.96 "low" gear.
[/ QUOTE ]
Another annoying new guy question, but what do you mean by freakish 1980 np205? Is there a difference and if so how do you tell which one you have and what makes them different. /forums/images/graemlins/confused.gif
Poohbair
1/2 ton status
1980 205's have a slip yoke rear driveline...
I think Jesse at at High Angle was toying with the idea of making a SYE(slip yoke eliminator) kit for 208's. The prototype's were cool but mucho expensive...but to answer your question, no you can't simply swap output shafts.
morphed86k10
1/2 ton status
I think the '84 205's are slip yoke also. My 84 K30 had a slip yoke on it.
I had a guy at a driveshaft shop here tell me that on my 208, that if my output shaft had a threaded hole in it that he could put a fixed yoke on it. don't know if he is right or not though, just going off of his word.
[ QUOTE ]
what is the difference between them and im i right the 208 is an alum case thats what mine has dont see any markings ?
any one know where to find a cheep one ed. /forums/images/graemlins/k5.gif
[/ QUOTE ]
OK I watched for a while and now to sum it all up:
the NP205:
- cast iron case
- gear driven
- 1.96:1 ratio
- fixed yoke 69-79 slip yoke 80 and on.
- 10 spline male, 27 spline female , or 32 spline female input.
the NP208:
- aluminum case
- chain driven
- 2.62:1 ratio
- slip yoke only
- 27 spline or 32 spline female input.
There are some ways to convert to fixed yoke but no kits to eliminate the slip yoke design.
Driveline solutions has a yoke that you can bolt on the shaft after you drill and tap the shaft for a bolt.
Each has it's strengths and weaknesses, from ratio, to weight to material to design.
Each has it's place in our hobby.
/forums/images/graemlins/thumb.gif
Sorry for the typo, it was 2.62 not 1.62:1
/forums/images/graemlins/rotfl.gif
what is the difference between them and im i right the 208 is an alum case thats what mine has dont see any markings ?
any one know where to find a cheep one ed. /forums/images/graemlins/k5.gif
[/ QUOTE ]
OK I watched for a while and now to sum it all up:
the NP205:
- cast iron case
- gear driven
- 1.96:1 ratio
- fixed yoke 69-79 slip yoke 80 and on.
- 10 spline male, 27 spline female , or 32 spline female input.
the NP208:
- aluminum case
- chain driven
- 2.62:1 ratio
- slip yoke only
- 27 spline or 32 spline female input.
There are some ways to convert to fixed yoke but no kits to eliminate the slip yoke design.
Driveline solutions has a yoke that you can bolt on the shaft after you drill and tap the shaft for a bolt.
Each has it's strengths and weaknesses, from ratio, to weight to material to design.
Each has it's place in our hobby.
/forums/images/graemlins/thumb.gif
Sorry for the typo, it was 2.62 not 1.62:1
/forums/images/graemlins/rotfl.gif
Pookster
1/2 ton status
I thought the 208 had a lower numerical ratio than the 205, as from stated in the other responses? /forums/images/graemlins/confused.gif
TXsizeK5
1/2 ton status
No, the 208 has 2.62 low gear ratio which is lower gearing... higher numerically.
affirmative on the 208s ratio. AFA the 208 having strengths... imo it really doesnt. If you want an aluminum/chain driven tcase there are MUCH better options out there. The 205 may not have the best ratio in the world, but if you beef it in a couple of places (input, front output) its as close as you are gonna get to indestructable... especially if you have a mild 350 like me. /forums/images/graemlins/smile.gif besides, its only a matter of time before 2.5t axles go in the K5 anyway, and with the stock 6.72:1 gear ratio, the 1.96 in the 205 will be just fine. /forums/images/graemlins/wink.gif
j
j
Last post edited.
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