I did the 80 swap cause i was getting scared of my 60, and wish now that I hadnt. Killed my bottom end and fuel milage. Had 60 with 3200 Circle D and 4:10's. Now 80e with 4000 ptc and 4:56's. now thinking about buying the 2:97 first gear plenatary set for it. So idk????

 

Your 80E didn't kill your MPG's, your 4000 PTC and 4.56 gears did.

 

 

Yea, thats why I'm thinking the lower 1st gear and go back to the 4:10's. I thought the bigger verter and lower gears would help me.

 

Anyone I know that has done the swap has lost nothing for the most part. Infact most of their times in the 1/4 have been as fast with more mph over the 60..

 

Then I don't understand. Even going to the 4:56's it seems like it just killed my bottom end. On the dyno it showed a loss of only 14 hp, but feels more like 50! I havent gotten to go to the track since the swap. just going by the way it feels.

 

maybe it something in the tune?

i know PTC sucks some kinda bad, and how are you loosing low end with a 4000 stall? What are you calling low end ?


Im running the Stock 80E converter, 3.42s, and 31" tires.. It has no low end till the turbo spools up and its off.

 

Huge (4000 rpm) converters are not well-matched to every setup that's out there. Lots of trucks would go slower with a converter like that, especially if it's not an efficient converter. Not knowing anything about your setup, makes it difficult for us (or anybody) to help you figure out what's wrong.

Take some time, fill out your sig. Or at least list all your mods when you ask a question like this. Esp if you want USEFULL help. Otherwise you're just pissing in the wind.

 

Where'd you hear that?

 

I added it to my garage. But its a 5300 lb ecsb with a 5.3 with a 224/226/581/581 114+4 custom grind,LS7 lifters, lunati double springs, comp chrome moly push rods, trunion upgrade, K&N CAI, 05+ e- fans pinned to the computer, 150 shot of nitrous (A beast on the bottle but most are), 4L80e, 4000 ptc verter, and 4:56's with a locker. Before I swapped so much up on it Shawn Evens was tuning it and it ran damn good! Shawns nitrous tune off the bottle with the 60e, 4:10's and 3200 verter made 353 @ the tires on the dyno. Now just feels like a turd.