1987 3/4 ton 4x2 swap with 1/2 ton 4x4

[Luis of EP]

Okay so here is what i have
1987 3/4 ton r-20
5.7L V8
350 motor
TH400 transmission
ALL HD ( According to the RPO)
Rear axle; has a 14 bolt with 4.10 gears

I also have a donor truck
1987 1/2 ton v-10 (according to RPO)
5.0L V8
700R4 transmission
Transfer case; Unknown to me ( I Do have pic)
Front axle i believe is a Dana 44 ( it has 10 bolts)
Front suspension is HD according to RPO
Rear Axle is a 10bolt with gear ratio is 3.73
Came with 35in BF good wrench tires

So my question is if i wanted to make my 3/4 ton a 4x4 could i swap parts from the 1/2 ton over all i really want is the 700R4 transmission with the transfer case and the front axial (with the "HD" springs) i do know i will have to change the front axles gears to 4.10 to match my rear but is it/ or should it be a bolt off and on job for the front axle or not? what other things should i take into account? Or is the donor truck just useless to me?

will upload some photos i thought might help

I do plan on using this to haul and some occasional Texas desert trails so some advice would help tons.

I

 

[Luis of EP]

Here are some other pics off the 1/2 ton

 

[Luis of EP]

Here is the 3/4 ton 4x2 pics

 

[87sierra]

your transfer case looks like a New Process 261 but i am no expert

i would think your plan would work but if your going to use the truck to haul the amount a 3/4 ton truck can handle i would find a 3/4 ton front axle

i would also not use the 700r4 trans since they are known for problems

but i am no expert in this kinda of swap

 

[Kapdin]

That front axle is a gm10 bolt not a dana. And yea as i hear if your going to work the truck at all stick with the th400. If its a daily driver for life the 700r4 and be nice to it. As far as swapping im sure itd doable but i hear its pretty involved but i have not rly looked into it so someone else will have to chime in.

 

[Luis of EP]

So i have identified that my Tcase is a NP 208 according to the tag with a gear ratio of 2.61 what i got off the tag as well

I found a conversion kit for the TH400 that supposed to accept the NP208
http://racetransmissions.com/store/product_info.php/products_id/162. can i or should i put the np208 t case on my th400? or look for another t case?

Any ideas on what i should do?

 

[Kapdin]

Id say if you got it and can match them up run it for sure. the only thing else id run would be an np205 but that 208 should be fine.

 

[Luis of EP]

Would a Dana 60 from a 75 ford f250 fit or will it require modification?

 

[Kapdin]

humm not much of a ford guy but i know the dana 44's from ford are high pinion's and the pumpkin's are driver side.

 

[HotRodPC]

So i have identified that my Tcase is a NP 208 according to the tag with a gear ratio of 2.61 what i got off the tag as well

I found a conversion kit for the TH400 that supposed to accept the NP208
http://racetransmissions.com/store/product_info.php/products_id/162. can i or should i put the np208 t case on my th400? or look for another t case?

Any ideas on what i should do?

This IS NOT what you need. This is for converting from a 700r4 or Th350 2wd, to a Th400 2wd kit. You will not find "A Kit" To convert from 700r4/NP208 to Th400 2wd to Th400 and a NP208 off of a 700r4/NP208. You'll need to find the correct Th400 trans to accept the NP208, and you'll need to get the correct NP208 also. MIght be best to locate a Th400/NP208 or Th400/NP205 combo already married.

 

[Luis of EP]

After i really looked at it your right on that conversion kit and im currently looking for either the bracket and a NP205 t case and as far as adding the t case with the bracket to my 3/4 ton could i still use the the regular drive shaft to connect my rear axle to it?? and then if i installed a D60 on my front end could i use the same front drive shaft off my donor truck?

 

[HotRodPC]

NO, the 2wd REAR driveshaft will be way to long, it can be used, but will need shortened. Usually about $60-$80 at a driveline shop. If you go with a common combo, you can usually find a driveshaft at a Pull A Part type lot for about $25-$30 and if you luck out, might even have newer U joints in it. Standard U joints, and cheap, Special U Joints usually are not so cheap.
You can use the front Driveshaft, but will have to have a Special Ujoint to make the conversion from one size U joint to the other bigger U joint used on the Dana 60.