How did your ET and mph change after going from a 60E to an 80E?

If other things were changed also when the tranny swap was done list them to make the comparison valid. thanks in advance!


I will be going 80E soon but I'm changing my stall also[12" billet 3000 to a stock Circle-D HD 80E converter].The weight should not be much different between them but the new stall will probably only flash to about 2500[I wanted the lower stall for street use because it is a 99.9% street truck].

I think my ET won't change that much because the lower stall and higher 1st gear will make for a smoother launch[less front end hop] and less rpm drop between shifts.Also I can push the engine a little more with the 80E behind it.

 

My times are measly, but it's still a comparison

Stock 6.0, headers, 4.10s, 4l60e/stock stall: 14.066 @ 96.64, 2.168 60'
Stock 6.0, headers, 4.10s, Yank PT3600, 4l80e: 13.738@99.33 w/ 2.037 60. Big wheel hop.

The limiting factor on both runs was tires I believe, since they were street toyos and couldn't put power down off the line. If it wasn't for the stall in the 80e, I for sure would have been slower with maybe a higher MPH. Even with the stall, the 4l60e comes out of the hole much stronger SOTP. Damn thing has more torque multiplication in 1st with 3.42s than the 80e does with 4.10s.

 

I have heard of a little bit of a slow 1st gear, but mph wise seemed to be higher with the 80..

 

yeah-I'm actually looking forward to the 80E's first gear because in 2wd my first gear is useless.

John- Are you working on an 80 swap too?

 

I have a 80e, but have not started gathering things yet.. If i go 80, it's prob going to get a brake and all that in it.. I have been quoted by some places on just rebuilding it, they seem to be a lot more then I fig as far as cost.. I have a local guy ( John Richmond) that has been building trannies for 2x+ years.. So I think ima give him a shot, but he has not gave me a price yet.. Prob going to build my own X member out of steel tubing also..

 

I couldn't tell you on times and I don't have a comparison but 80's always seem to trap higher that a sixty. The first gear is kinda slow but second is really fun.

 

Im betting the First gear in the 80E is really going to help us FI guys get going instead of spinning faster.

I'd glady lose 2-3 tenth if i dont have to worrie bout my trans anymore LOL

 

I don't have direct results, but by going off your times I can say...

A buddy of mine has a sstb with a ls2 and stock 4l70e(almost the same as a 60e), went 14.12 @ 95.1
He went with a 3600 converter and went 13.31 @ 98.27 . So it seems his converter vs your converter 80e swap may be a decent comparison since he was 14.1 in the beginning.

But I would say if you were FI, a 4l80e and a tighter converter would be a better combo, but my buddy is N/A and a high stalled 60e makes for a good combo there....well, if it is built right. I rebuilt the 60e in his truck and so far he has been running around for a year, and about 3 trips to the track, still shifting good so far.

 

I'm confident it would have gone low 13s with slicks and a cutout. The run was through a stock catback. Of course, the would have, could have stuff doesn't matter lol. I went back after adding the cam and trapped 102 but I could only run 13.90s. It was pointless trying to run on street tires.

The runs were at the now closed Gateway BTW

 

I cant dig up times and traps between the two that are very accurate because I have a habit of changing entire setups from front to back LOL... I will say that going from the turbo 5.3/65E setup (70mm) to the 347/80E setup (78mm) The pull was so much steadier and harder through the low to mid range. I'm attributing that to the gearing difference and the added cubes and more efficient turbo. with both setups, first gear was pointless and 65-70mph rolling burnouts were on tap whenever I chose to do so. The 65E was an FLT-5 with a yank SS3600 9.5", and the 80E was a Rossler unit with a Yank SC3000 10.5". Both builds were on 3.73 gears.

my next setup will be back to a built 60E with 4.56's and a 4400 9" Circle-D