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post #1 of (permalink) Old 08-07-2000, 03:52 PM
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Gutted my 3/4ton help identify T-case and heads

OK the body was shot on my 1977 GMC Camper Special so I sold the axles, and I'm trying to sell the engine(350)/tranny(350)/transfer case(?), but I'm not sure what I have here. What codes or stamping should I be looking for on the T-case? I know what the tranny is, but the heads have been replaced before I came into possesion. They have double bumps in the casting location, I heard these would be 202's, I just wanted to verify that. I have not pulled the pan, and don't wish to if I can avoid it, anyone know if this is a 4 bolt main. Thanks in advance

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post #2 of (permalink) Old 08-07-2000, 04:09 PM
 
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Re: Gutted my 3/4ton help identify T-case and heads

Unless its had parts swapped in it should have a 203 T-case and it will be a 4- bolt main. You can look on the back of the case and there should be a round tag that tells you what it is. Also if its full time 4WD its a 203 but if its not it may have a part time kit.

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post #3 of (permalink) Old 08-07-2000, 06:28 PM
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Re: Gutted my 3/4ton help identify T-case and heads

The heads are a little tough, unless you have a book w/pic's to go by. If you do take the cover off the head, post the #'s and I'll lookem up for you. Likewise for the block (one # is behind the distributer on the right as you look from the front, near the bellhousing, raised. 2nd is in front oposite side behind the water pump. It's on a flat surface on the left, stamped in) The T-case is a little easier. The 205 has two "rails" that slide into the case. Connected by a flat bar, and the handle bolts to the case. It's a pretty good case of engineering to get the rails to "wiggle" back and forth as you change gears. I know the 203 is different, but it's been a while since I've had one. Hope this helps. (There should be a blue tag on the back that says for sure, it's about 2" diameter).

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post #4 of (permalink) Old 08-08-2000, 12:02 AM
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Re: Gutted my 3/4ton help identify T-case and heads

Check the casting Numbers with Mortec http://www.mortec.com/castnum.htm usually the mid 70's truck block was casting #3970010 or 3970014, and as luck would have it, those casting numbers could be 2 or 4 bolt main. One method of figuring out a 4 bolt main I learned here on this BBS, was that when the top center bellhousing bolt hole is drilled and tapped, the odds increase that the block is a 4 bolt main. I've found only one block that this was not true. Surf the Mortec site, there pictures where to find the casting numbers.
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post #5 of (permalink) Old 08-09-2000, 07:15 AM
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Re: Gutted my 3/4ton help identify T-case and heads

Another common identification mark on 4-bolt small blocks are the numbers 010 stamped on the sides.

post #6 of (permalink) Old 08-10-2000, 04:19 PM
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Re: Gutted my 3/4ton help identify T-case and heads

How many NP203 have you seen ? I have seen alot, over 500.
I have never seen the tag at the back of the t-case.
Please respond and prove me wrong.
TIA

post #7 of (permalink) Old 08-10-2000, 04:26 PM
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Re: Gutted my 3/4ton help identify T-case and heads

The 203 should be easy to identify. If the T-case has two sections, one more or less vertical, the other diagonal, it is the 203. The 205 is one box. Cant help you with the head ID, but as others have said, you should have a 4-bolt main, unless the whole engine was swapped out for something from a passenger car.

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