Th400 & 205 transfer case what years ?

[65ChevyUtah]

I am new to the 4x4 world I am putting my 65 chevy on a 77k20 frame. I have a
Th400 2wd trans that I want to use. In my research I found that the some of the 205 figure 8 style transfer cases use the 2wd th400. Does any one know what years of trucks I can find a 205 32 spline transfer case setup for the 2wd th400 ?

Thanks.

Pick N pull is having a half off sale this weekend so I am hoping to find the right one.

[ghettoluxury]

Any 32 spline 205 will work with the 2wd TH400 as long as you have the adapter that goes with it.

[b454rat]

Measure the output shaft sticking out of the tranny. If it's 6.5" then you use the adapter and case off an early 400/205. 84 and older.

All 1980 Gm trucks that are 4wd will have a 205, so find a 3/4 or 1 ton, long as it's an auto.

After 80', only 1 tons will have the 400/205. Prior to 80', 3/4 and 1 tons will have it, but can't remember how far back. Think it's only to 77/78.

[martindc1]

Advance adapters sells various coupler sleeves to mate the various np205s to various transmissions. For instance I think they sell a 32 spline to 10 spline coupler sleeve.

[ghettoluxury]

as long as the adapter is for a 400/205 and it mates to the 205 you have than it will work. so if you are going to a pick-n-pull than just make sure the tranny u pull it from is a 400

[65ChevyUtah]

Good News ! I found a guy selling a 205 for a th400 for $200. I bought it and hooked it up last night. Bolted right up. Thanks for your help.

[ghettoluxury]

Not a problem, that's why we are here.

[65ChevyUtah]

well I tought I was on the home stretch on this project but It appears that the transfer case sits to lower using the original 205 crossmember. I thought all 205 crossmembers where the same ?? how to I do I get it to sit about 3-4 inches taller ? Is there a different crossmember i need or different mounts ?

Thanks again.

[OrrieG]

Can't you slide the crossmember you have up the frame, trim the top side flanges and drill new holes? If not maybe a piece of 2, 3 or 4" steel tube with trans mount to fit. Bolt bottom the cross member, top to mount and you are ready to go.

[65ChevyUtah]

Thanks for the help I think that would work for the length but the other problem I have is where the front drive line connect to the transfer case it is to close to the crossmember.. I may just have things jacked up. I'll take picture and post when I can.

[H8tulooze1]

I had my NP205 machined for the TH400 output, I broke a couple of adapters and now it holds together just fine.

[68K20 x Drill]

there are tall and short TH400 adapters, each with its own crossmember. I'm not sure which trucks came with what, but the difference is 2 1/2 - 3 inches.

[Dooley]

Originally Posted by b454rat

Measure the output shaft sticking out of the tranny. If it's 6.5" then you use the adapter and case off an early 400/205. 84 and older.

All 1980 Gm trucks that are 4wd will have a 205, so find a 3/4 or 1 ton, long as it's an auto.

After 80', only 1 tons will have the 400/205.


"Prior to 80', 3/4 and 1 tons will have it, but can't remember how far back. Think it's only to 77/78.

All GM light duty trucks with automatic transmission from 1974-1979 had the 203 transfercase as standard equipment.