Looking for some driveshaft measurements

[goathearder]

Hey Guys,
I found a np205 to replace my busted up 203 and I was hoping someone could get me some driveshaft measurements so I can see how close my current ones are to what I would need.

I am ultimately going to have a 350/350/205 setup so if you have the same setup and can measure your front and rear driveshaft lengths that would be a huge help to me.

It appears from that I can tell that the front driveshaft is the same length going from a 203 to 205 (with a possible yoke change on the 205) but I can really find anything about the rear driveshaft.

Also, if I go to the junkyard for driveshafts, did the blazer have the same length as any of the similar year trucks?

Thanks,
John

 

[1BEATK5]

the front shaft will have to be shortened. The rear will have to be longer.

Every truck is different depending on axles, suspension, and the which trans/t-case combo It has. your best bet is to stick the t-case in, then measure for new or junkyard shafts

 

[goathearder]

If I went full out and did the 203/205 doubler I would be able to use the exact same driveshafts though right? ORD says the doubler is the same length as the original 203 so I am assuming the driveshafts wouldn't have to change.

 

[1BEATK5]

The rear driveshaft length would be the same. The front would need to be longer. That's part of the reason I have a doubler, to have the longest possible front shaft.

 

[goathearder]

Gotcha, good to know.

 

[diesel4me]

When I put a NP205 in my 74 GMC K2500 and ditched the NP203 it originally had,I was able to re-use the rear driveshhaft,it fit fine,but the front one was about 6" too long now...I eventually found one off a 1969 K10 that was only about 23" long,instead of 29" or so,and it had the same bolt up flange as the older NP205 I had put in it (out of a 72 truck),rather than the 4 bolt "ring" the NP203 used ..it fit perfect..(I later found out the 69's were the only year that had a short shaft too!)..

.it had real sloppy splines though!..sounded like a dozer with worn out tracks when I used 4wd!..but I was lucky to find one at all...