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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: mikerhoades50 on January 09, 2012, 02:09:40 pm

Title: tranny and T-case question
Post by: mikerhoades50 on January 09, 2012, 02:09:40 pm

I have an '83 k10 with a th350 tranny. I just rebuilt the tranny with my dad (who has not done one in 25 years) my question is does the tranny fluid flow from the tranny to t-case or are they independent systems? If they are independent how do you know when the T-case id full? I had some leak out when it was sitting on the floor, and I want to make sure I have the correct amount in it before I start driving the truck.

Thanks in advance for the help!

Title: Re: tranny and T-case question
Post by: firefighter on January 09, 2012, 02:45:12 pm

The transmission and transfer case do not share the same fluid.

What model of transfer case do you have? It should have a fill plug on it to check the level and add more if you need to.

Title: Re: tranny and T-case question
Post by: mikerhoades50 on January 09, 2012, 02:51:20 pm

I am not positive but I think it is a 208. The tag on it says model 208, but I am not sure. There is an 1 3/16 (or so) fill plug on it. Do I just fill it till it runs out the fill plug?

Title: Re: tranny and T-case question
Post by: firefighter on January 09, 2012, 03:28:23 pm

Quote from: mikerhoades50 on January 09, 2012, 02:51:20 pm

I am not positive but I think it is a 208. The tag on it says model 208, but I am not sure. There is an 1 3/16 (or so) fill plug on it. Do I just fill it till it runs out the fill plug?

I'm pretty sure the 208 uses just regular ATF fluid.
Crawl under the truck behind the t-case theres 2 plugs, one on the top and one on the bottom,,,unscrew the top one and fluid should be at that level if not dripping a bit from there.

Hope this helps.

Title: Re: tranny and T-case question
Post by: mikerhoades50 on January 09, 2012, 03:53:25 pm

Thanks, that is what I thought, but I just wanted to be sure

Title: Re: tranny and T-case question
Post by: mikerhoades50 on January 09, 2012, 07:33:34 pm

boy am I glad I asked! It took almost a gallon to fill it!

Title: Re: tranny and T-case question
Post by: Blazin on January 09, 2012, 09:39:07 pm

I know a guy thats rebuild transmissions, and transfer cases. He told me to run 5W30 or 10W30 motor oil in a 208 once. Thats what I have run ever since in all my 208s.

Title: Re: tranny and T-case question
Post by: mikerhoades50 on January 09, 2012, 11:22:40 pm

wow I have never heard that... I know that the fluid that was in it was red so I assume tranny fluid

Title: Re: tranny and T-case question
Post by: hilton850 on January 10, 2012, 11:05:19 am

I have a 208 in my truck.  Factory recommends ATF.  I've also heard that motor oil works....but I run ATF and haven't had any problems whatsoever.

Title: Re: tranny and T-case question
Post by: johnhood on January 11, 2012, 07:24:17 pm

mine has a 208 would it be better for my transfer case to run engine oil? im about to service it and the transmission?

Title: Re: tranny and T-case question
Post by: Engineer on January 12, 2012, 05:42:47 pm

If you live in a predominately cold region use ATF.

Predominately hot use 10W40 engine oil.