two quick questions:

1. is there a spacer between the flywheel and the engine required, as there is between a flexplate and the engine?

2. heading back to the Junk yard for some parts. How do you identify the rear Differential Ratio. My Truck is just a 2wd , but has 4:10 gears and i do not like the high rpm on cruising. Now while i am doing the manual swap, i was considering the smaller gears.

thanks for any quick help

 

1. No

2. There is a tag under one of the bolts that hold the diff cover on that has the ratio on it.

 

IF there is no tag you can jack up the rear and count the number of driveshaft revolutions to one tire revolution. Your only other option out of an obs is 3.55's. You can use 3.73's out of a superduty rear if you want to/can find them

 

thanks.. that was quick.

does the tag tell me the ratio or just a code? what would the door sticker code be for the 3.73 gears?

also does the one from and f250 fit on a dually axle?

 

The tag will tell you the ratio, and it will be either 3.55 or 4.10, no 3.73s. They were not offered in these trucks.

 

door tag is just a code. I have no idea on the 3.73's. I better make sure I'm right on this. I THINK the dually is still a sterling 10.25. Is that right Bill? If it is you can use the SD gears.

Or is the dually a dana 80?

 

The dually pick-ups (not the cab and chassis) are a Sterling 10.25, but you can't use SD gears in them. The SDs are 10.50.

 

They are 10.5, but you can use them. At one time Neal offered to sell me a set of 3.73's out of a SD but I passed.

 

I didn't know they would fit! You learned me something Darin! LOL! Of course you guys always do.

 

What rear end came in the cab and chasi trucks?

 

I was going to say Dana, but that is the F-Super Duty. The cab and chassis have 10.25 Sterling also.

 

Thats what i thought but was not sure.

 

I'm wanting to find out if my Dana 60 is a LSD but not sure after I found this pic my tag looks like the one on the right but my tag says "N" where the picture says it would indicate if it is limited slip can anyone verify the picture or any information is appreciated it's a 97 srw f350 4x4

 

Where the ratio is, is there an L between the first and second digits? E.g., 3L55 would mean limited-slip 3.55, whereas "3 55" would mean open 3.55.

Also, if you think it's the original diff, what is the axle code on the door/jamb sticker?

 

Here is how I found what I have
Differential Identification | West Coast Differentials


Don't go by door jamb unless you know truck was stock.


take a pic of the tag if you want help to decipher it