Transmission / Differential ID

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Dec 30, 2006 | 09:12 AM

Ogriv

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Transmission / Differential ID

I am a bit confused and perhaps you all can set me straight. I am trying to identify my transmission and my differential. Now I must say, that I know where these items are physically, but I am confused on how to determine which type I have. I keep reading about folks having a "Dana" or a "Ford" diff, but how do I determine which one I have? Same with the manual transmission, is it a New Process with or without extension, is it a Warner......Argh

The tag that is hanging from the differential has some numbers stamped into it. They apppear to read as follows:

1st line: S 608 D -This line is hard to read, so this may be incorrect

2nd Line: 55 8 8 7B23

I cant find any tags on the transmission.

1987 F150 300 I6 2WD

I have 4 forward speeds (including Granny Gear) and 1 reverse gear. The shifter is located on the floor.

Any help would be appreciated.

Dec 30, 2006 | 11:48 AM

andym

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From: Bonita Springs FL

The tranny is most likely a BW T-18. The NP 435's were rare by 87 - I think 86 may even have been the last year you could get one. The rear axle is a Ford 8.8" with a 3.55:1 ratio.

Dec 30, 2006 | 02:23 PM

Ogriv

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Thanks for the reply! <p>

I replaced the transmission fluid today with 3.5 quarts of 80W-90 gear lube. I was going to replace the differential fluid as well, but the Haynes book says to use "HYPOID GEAR LUBE". Can somebody clarify what that is?

Thanks again.

Dec 30, 2006 | 08:45 PM

Ogriv

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Ok, I after doing some research, I realize that Hypoid is the type of gears in the differential. So does this mean that the standard 80W-90 that I used in the transmission won't work?

Thanks.

Dec 31, 2006 | 12:36 AM

hadman50

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Joined: Apr 2005

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From: Bremerton, WA

I'm pretty sure that the oil you added is just fine. The rear end takes more stress on the oil than the transmission does. And almost all gear oils are rated as hypoid type