np203/np205 swap crossmembers

[mcchad]

I was needing a sm465 for my '74 K20 and found one that came with a np205. Had a bit of a time to find a slip yoke as the unit was from an '81, but everything else was fine until I tried to put in the crossmember. My crossmember has mount holes 7 1/2" apart, the 465/205 adapter has them 6" apart and offset a bit from crossmember. I can not find a parts listing for different mounts or crossmember. What is my solution?

 

[ali_c20]

Scrapyard or modify your crossmember.

 

[AuroraGirl]

i can put the cross memeber side-by-side to the proper one if needed. i have a 77 and 80 cross members, both k25 3/4 ton

 

[bucket]

I was needing a sm465 for my '74 K20 and found one that came with a np205. Had a bit of a time to find a slip yoke as the unit was from an '81, but everything else was fine until I tried to put in the crossmember. My crossmember has mount holes 7 1/2" apart, the 465/205 adapter has them 6" apart and offset a bit from crossmember. I can not find a parts listing for different mounts or crossmember. What is my solution?

If the donor '81 was not a K30, there's no doubt it was swapped in from another truck. And if it was a K30, the crossmember won't work in a K20 with smaller frame rails.

Is it a "round pattern" 205? They used a different mount and a different crossmember than what your older truck came with.

 

[mcchad]

Thanks for the help! I may take you up on that AuroraGirl, reading your thread inspired me to start this one. It is the figure 8 style 205, it is from a K30 (so I was told) but I am attempting to use my existing crossmember from 203. So, I ended up calling a local yard because when I was looking for the slipyoke, the guy saw the phone pic and knew exactly what I had and needed. I also got a shifter from him and thought that same rig may have a crossmember. He's pulling it tomorrow and I'll pick it up on Saturday. Hope it is my answer. Thank you all again.

 

[bucket]

Thanks for the help! I may take you up on that AuroraGirl, reading your thread inspired me to start this one. It is the figure 8 style 205, it is from a K30 (so I was told) but I am attempting to use my existing crossmember from 203. So, I ended up calling a local yard because when I was looking for the slipyoke, the guy saw the phone pic and knew exactly what I had and needed. I also got a shifter from him and thought that same rig may have a crossmember. He's pulling it tomorrow and I'll pick it up on Saturday. Hope it is my answer. Thank you all again.

I'll have to compare again, I remember my 205 and 203 crossmembers being the same. One of the holes is an oval.

 

[AuroraGirl]

Would you guys like a picture of mine or is fine not needed? if I read correctly it sounds like you're talking about a 1-ton instead of a 3/4 ton

 

[K201979]

I'll have to compare again, I remember my 205 and 203 crossmembers being the same. One of the holes is an oval.

^^^ this. When i swapped a 76 racetrack 205 in place of my 79 203, both crossmembers were the same. One hole is oval and you move the rubber mount over to compensate.

 

[K201979]

Heres the holes in the crossmember. This is from a K10/20. 1 ton crossmember may be different.

You must be registered for see images attach

 

[AuroraGirl]

1980 k25

You must be registered for see images attach

I can get a closer snap shot of it and the 77. 205 for both

 

[bucket]

Heres the holes in the crossmember. This is from a K10/20. 1 ton crossmember may be different.

You must be registered for see images attach

Oh, I just remembered! I think that crossmember had a third application too, as a carrier bearing crossmember on crew cab trucks. I can crawl under the truck tomorrow and double check that.

 

[HOTFOOT]

You must be registered for see images attach

My 80 gmc k3500 400/205 looks the same only 2 1/2” rise on the cross member

 

[AuroraGirl]

You must be registered for see images attach

77 k25

I couldnt get a pic of my half ton np203, its too many weeds and bugs that have high potential of ending my life