Originally Posted by CK351
What Kinda Diff Gears Would Be Great For A Every Day Car? I Have An Xc Fairmont With A 302 V8 C4 Auto
Personally I'd stick with the 2.92 if you have a borg warner. 9" diffs are usually 2.75 for non-lsd and 3.0 for LSD.
You can use a 3.55 but personally I wouldn't want a 3.55 geared car for every day use as fuel consumption would be on a large and expensive side.
To sort of give you an idea. A 351 running a 2500rpm histall and 3.55 diff cost $120 to go from Melbourne to Shepparton one way. So $240 there and back.
Where a 2.92 geared 302 cost roughly $130 both ways.
So if you drive more than 10k's to work one way? 3.55's would be okay fuel wise but would still cost about $80 per week easy. Don't use anything less than 3.0 if you drive more than 10k's each way.
I have 4.11's with a 351. A simple 100k trip for me is $30-$40.