T-case identification(help please)

[cleanK5]

Ok, I'm trying to ID my t-case and it's been 6 years since I've owned a GM.

I've got a th350 in my 72 4x K5. The transfer case is cast iron with aluminum covers.... is this a 205?

Also, that would mean it's got a chain, not all gears correct? What should I be running for lube? It's leaking dex3 from the speedo cable hole, which had me worried until I remembered that it's not a Toyota(I sold my 4th toy truck to get the K5)


Any help for the newbie would be appreciated

-Luke

 

[Muddytazz]

203's are chain driven, 205's are gear driven, there should be a TAG plate on the tcase somewhere

 

[cleanK5]

cool, I'll crawl around and try to find it later.

any idea on the fluids? I would assume gear lube in the 205, and dex3 in the 203 because of the chain...

 

[Muddytazz]

no no no on the dex3....203's get 30w motor oil only and your correct on the gear lube for the 205

 

[RustyParts]

Tag should be on backside of transfer case (towards rear driveshaft) blue and white in color, unless someone rebuilt it and didn't put it back on.

Probably a 205.

 

[DEMON44]

On the Left 203 on the right 205.

The rear of any 205 will have a silver dollar sized cover plate with 3 bolts holding it on, right in the middle. Thats the rear support for the idler.

203 has a whole range box hanging on the front.

 

[DEMON44]

I found a better shot on one of my other 205s, thats the small 3 bolt plate on the ass of every 205.

 

[cleanK5]

yup, it's a 205.

thanks very much for all the help guys. this site is awesome!!