Look I have a 99 ford rc with a 4.6 and a 5speed. Ford guys dont talk about anything and think yall could help. I put posi in my truck truck two weeks ago and went to the track and run 15.8s. My bone stock run was 16.6s. I was very impressed. I just took my 308s out and installed some 373s and was wondering how many tenths I should expect to be dropping. With just the posi I was hooking good and 2.1 60fts but my 1/8 mile was like a 10 flat. I hope to break 9s and maybe a 2 flat 60ft. Thanks

 

I don't think that would be out of reach. Try launching it a little harder too.

 

damn that is a good 60ft with that 15.8.... from your recent gear change you should get another 2-3tenths from your 1/4???