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chevy trans..350 or 400


hunterdeer's Avatar
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07-23-03, 11:57 AM   #1  
hunterdeer
chevy trans..350 or 400

How do you tell the difference in transmissions...mine is blown..need another..junk guy needs to know what kind I have so i can order another when one comes in..I have an 87 chevy pick up.,,2wd......350 engine..I need to know if i got a 350 or 400..thanks,,,hunter

 
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07-23-03, 12:54 PM   #2  
Joe_F
If he doesn't know which you need, you're in the WRONG place!

1) Depending on the option, the 400 was usually the trans used.

2) Tell him to check a Hollander interchange manual as to which ones were used on your application and how to identify it. The THM350 pan is usually square for the most part.

BTW: Junkyard trannies are just that. JUNK! Get your original rebuilt. Shouldn't set you back more than a couple hundred bucks---well worth it!

 
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07-23-03, 02:53 PM   #3  
THM 350 like Joe said the pan is square, except one corner is at a 45 deg.

400 has a bunch of curves to it.

 
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07-24-03, 11:45 AM   #4  
Did't most trucks of this year have the TH700R4 ?

 
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07-24-03, 11:57 AM   #5  
Joe_F
Depends on the options the truck had.

Simple way to check:

Go to the glovebox or under the hood. There will be a large option label with all attributes about the truck.

If it has M40 on it, you have a THM400.
If it has MD8 on it, you have a THM700R4.

Done . Let us know what you find. Again, the junkyard should know.

Also, a THM400 is a 3 speed, a THM700R4 is a 4 speed. Your shift quadrant on the dash would read PRND21 for a THM400, PRND (with a circle) D (without a circle) 21 would be for a 700R4

 
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07-25-03, 06:13 AM   #6  
redneck
My truck has an M30, always wondered what tranny it was?

 
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07-25-03, 06:47 AM   #7  
Joe_F
M30 is a 4L60E.

 
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07-25-03, 10:09 AM   #8  
knuckles
4L60E=fully electronic 700R4. Looks the same from the outside but has no TV cable.

 
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07-25-03, 11:08 AM   #9  
Joe_F
Correct. 4L60E is simply the newer Hydramatic nomenclature.

4=number of speeds, 4 in this case.
L=mounting type. Longitude type mounting. T=transverse
60=Relative torque capacity
E=Electronically controlled.

 
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07-25-03, 03:39 PM   #10  
TH-400

The turbo 400 pan looks like the shape of Texas

 
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07-25-03, 03:42 PM   #11  
TH-400

Sorry the turbo-400 also has only 3 speeds besides the shape of Texas pan.

 
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07-26-03, 12:17 AM   #12  
knuckles
The link below has lots of GM RWD transmission ID & basic technical info.

http://home.hiwaay.net/~ppatter/auto_tranny_id.htm

 
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07-26-03, 08:14 AM   #13  
hunterdeer
thanks

thanks for all your help guys......I found through your info that it is a 700-R4....In the glove compartment on the parts label it said it was an MD8.(700-R4) and in the pan identification that knuckles sent me it showed me it was the 700-R4...Thanks all Hunter

 
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