I didn't have to change anything on mine, but mine was also a 1983 swap to 1983 swap. I had a 727 with a 208, swapped it to 435/205. I encourage that you do your research before the swap. The most important piece of information you will need to look into will probably be driveshafts and output yokes. Your driveshafts will need to probably be adjusted in length at a minimum. I am assuming your front shaft will be too short as the 203 is a big T-Case setting it back farther than the 205. The rear may be too long as it is now again because of the big 203 case. Also the output yoke on the 205 is probably much larger than what came on your 203. Mine was compared to the 208. I believe it is 1350 or 1410 on the 205. Your 203 is probably the old Detroit style. Get your measurement gauges out and that will help you. Here is a link to common sizes for both styles...I like to switch transmission from my standard ('77 W-200 M-884) 727 autobox with a married 203 to a 435 manual divorced 205.
At Frame level, what do I need to change?
I thought the 435 has another traverse compared to the 727?
divorced 205 hangs on a crossmember driven by a drive shaft from trannie no
EL, is correct. I believe this is unique to the divorced setup. There are specific crossmembers for each since it is divorced (2wd crossmember for the tranny). You probably can make something work with what you have but will require some additional hole making in your frame for mounting.We call that a crossmember. It should be the same for a 727 and 4WD NP435, but with a 2WD version for a divorced NP205, you will probably have to find a 2WD crossmember. Make sure you get the crossmember with the NP205 as it's a pain to mount one otherwise.
The divorced setups used in '74 and earlier trucks used the same transmission as a 2WD truck. They just connected a short driveshaft to the transfer case instead of the rear axle. There was no such thing as a "4WD transmission" back then, you just either had a transfer case after it, or you didn't.What do you mean with 2 wd or 4wd version?
I mean it's a transfer case, as far as I know you find them only at 4wd's?
Didn't the 727 for the divorced 4wd's use the short shaft tranny, not the standard 2wd version.
They used the "Shorty/ Motorhome" 727 in 2 WD trucks?The divorced setups used in '74 and earlier trucks used the same transmission as a 2WD truck. They just connected a short driveshaft to the transfer case instead of the rear axle. There was no such thing as a "4WD transmission" back then, you just either had a transfer case after it, or you didn't.