390 FE
Fleet Mechanic
Joined: Aug 2000
Posts: 1,504
Likes: 1
From: Texas
390 FE
Thanks, I'll pay a little bit better attention to the tach the next time I take the truck out for a spin. When I get my new gas tank put in that is.
I'm doing a Mustang tank swap, getting that tank out of the cab. It likes to leak gas down the outside of the truck on a hot summer day! Plus it'll give me some more leg room in the cab as well.
Kyle
I'm doing a Mustang tank swap, getting that tank out of the cab. It likes to leak gas down the outside of the truck on a hot summer day! Plus it'll give me some more leg room in the cab as well.
Kyle
Laughing Gas
Joined: Oct 2001
Posts: 957
Likes: 3
From: Winchendon MA
390 FE
Heres a handy link. This is where i got my spreadsheet.
http://www.parkercarburetion.com/
http://www.parkercarburetion.com/Downloads/RacingFormulas.xls
Theres lots of fun calculators on Earls page.
44Dwarf
http://www.parkercarburetion.com/
http://www.parkercarburetion.com/Downloads/RacingFormulas.xls
Theres lots of fun calculators on Earls page.
44Dwarf
Laughing Gas
Joined: Apr 2002
Posts: 869
Likes: 1
From: Apple Valley CA USA
390 FE
unless you have a limited slip rear you need to double the number of turns to compensate for the spiders. 1.75 turns is a 3.50-1. if you have an F100 you mostly likely have a 9" and they came with 3.50 gears. if you have a Dana rear you likely have 3.54 gears. later trucks in the mid 80's have 8.8's and they came with 3.55 (just for the trivia factor). hawkrod
Fleet Mechanic
Joined: Aug 2000
Posts: 1,504
Likes: 1
From: Texas
390 FE
My truck actually left the factry in California with the 3.70 gears in the rear end.
As far as posi goes, if you get on it in my driveway (semi rocky) you will have a two to three foot section between where the right wheel starts spinning & the left starts spinning.....
But as for the gears now, I am guessing, (who knows this could be the original rear end?)
Kyle
As far as posi goes, if you get on it in my driveway (semi rocky) you will have a two to three foot section between where the right wheel starts spinning & the left starts spinning.....
But as for the gears now, I am guessing, (who knows this could be the original rear end?)
Kyle
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