Thanks. That .08 is a little difficult to count lying on the driveway.

 

i can get ford motorsport gears for 139.00 plus shipping. i usually charge 100 to install them. the price on the gears might have went up some but not much i have not bought any in a while.

 

well ship me a set of 4:30

 

can i rent a dial tool or whatever to mesure the backlash from a store like pepboys or kregans? or how much do they cost for an ok working one?

 

yes yopu proubally could. the 4.10 gears vfast will run you a little more. i would take it to a reputiable garage that wold let you watch them install the gears and then try one on you own later.

 

the dails and indecator are like 150-200

 

I have an 89 Stang 5.0, and i was wondering if anyone knew what rear end i had...i was under the impression that i had a 8.8...am i wrong?!

 

8.8 is correct.

 

Using the site listed on another topic, for my '96 GT I'm coming up with 3.36 does that sound right?

 

if you want to be absolutely sure what you have, look for the metal tag hanging from the rear on one of the housing bolts-write down all the numbers and letters exactly as they appear and take it to your local Ford parts man who can look it up and tell you exactly what rear and gears you have. this way you won't be guessing at all unless someone has already been in there and changed them. I would go with a posi-trak rear with 3.73 gears for the street as this is a happy medium between go fast acceleration and gas mileage. An AOD tranny with overdrive would probably be a better choice than the C-6 if this is primarily a street driven car as the overdrive really helps the engine run less rpms at highway speeds. You might want to consider swapping in an 8.8 rear for the strength and better axles, I raced my basically stock 5.0 motored '88 with 3.73's, an Auburn posi, and 26" x 9" slicks for several years and never had a problem with the 28 spline stock axles.
hope you know that a 351W will probably require a cowl hood to provide clearance and that the front springs and brakes will be undersized for the weight of a V-8 versus the 4 banger you have now. good luck with the swap!