LSD? How do you tell? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

raytriplej · 08-22-2005, 05:43

Hi,

Pretty simple really, how do you tell if you have a LSD diff or not when the rear wheels are off the ground?

Also, any tips on calculating the diff ratio without pulling the guts of the diff out?

Ray

tufLTD · 08-22-2005, 06:29

Quote:

Originally Posted by raytriplej

Hi,

Pretty simple really, how do you tell if you have a LSD diff or not when the rear wheels are off the ground?

Also, any tips on calculating the diff ratio without pulling the guts of the diff out?

Ray

If it's an LSD, both wheels should turn the same way, i.e. if you turn the left wheel forward, the right wheel should also turn forward. A non-LSD will turn in opposite directions.

raytriplej · 08-22-2005, 13:09

Quote:

Originally Posted by tufLTD

If it's an LSD, both wheels should turn the same way, i.e. if you turn the left wheel forward, the right wheel should also turn forward. A non-LSD will turn in opposite directions.

As easy as that! Thanks for your speedy reply.

Ray

bossxr8 · 08-23-2005, 02:17

Quote:

Originally Posted by raytriplej

Hi,

Pretty simple really, how do you tell if you have a LSD diff or not when the rear wheels are off the ground?

Also, any tips on calculating the diff ratio without pulling the guts of the diff out?

Ray

The diff ratio can be determined by finding the little metal tag on the diff centre that has the ratio stamped on it, or count how many times the tailshaft does a complete turn compared to the wheels. If the tailshaft turns 3 times to the wheels once then it is a 3:1 ratio. I think thats correct.

RPO-083 · 08-23-2005, 02:27

Quote:

Originally Posted by bossxr8

The diff ratio can be determined by finding the little metal tag on the diff centre that has the ratio stamped on it, or count how many times the tailshaft does a complete turn compared to the wheels. If the tailshaft turns 3 times to the wheels once then it is a 3:1 ratio. I think thats correct.

Yeah, for a LSD it is that easy. Better off going more turns to reduce the error. For example, mark the tailshaft and the wheel. Have someone watch the wheel. You turn the tailshaft until the wheel has spun 10 times. Then however many times the tailshaft spun, divide by ten. It is a lot easier to accurately count 27, 28 or 29 compared to 2.7, 2.8 and 2.9 (figures are for examples only).

TruBlu351 · 08-23-2005, 03:18

Could have done a burnout too and counted the black marks, 1 or 2