Ok im sure we have all heard, your truck gets slower swapping from 60 to 80 but, has anyone actually done a before and after track time? If so, can someone please inform me on about how much you REALLY do lose?

 

well i went from a yanktt3000 stalled 60E (13.4@102) to a stock TC/80E (13.2@104)
STS 6psi, stock LQ4.

prolly slow down a tenth or two N/A but pick up a mph or two from the gearing. It all depends on the setup tho..

 

Depends on the setup. Ask yourself this, how many go back to a 60e?! I wish I would have just put the matching 80e in when I did the 6.0 swap 5 years ago. live and learn.

 

SC in a 80 with boost? And you picked up?

 

I had this 65 rebuilt to stock about a year ago and surprisingly its held up behind my 6.0 with spray until now

 

Yea, the gearing is nice.
60E
3.06, 1.62, 1, .7

80E
2.47, 1.47, 1 .75

gearing in the 80E is close, once you get moving it pulls great on the top end. But that was with a turbo.

 

My times are better n/a and on nitrous with the 4L80

 

Something in my setup never worked right tho (prolly the sts system?). My best 60' was only a 1.95 and that was leaving on 6psi and a 50 shot. That ended up as a 12.5@111 pass. But most the times 2.0 was all she would do.
One pass it did a 1.88 and bout lost it after 100'. Think water or something was on the track.

Id rather have a peace of mind knowing the transmisson wasnt a weak link than tryin to go a few tenths faster. But thats just me.

 

I've actually been .15 faster to the 60' with the 4l80 but that was after the carb swap.

 

Told ya so....