6.0L/4l60E w/2.73's vs 3.42 gears
#1
6.0L/4l60E w/2.73's vs 3.42 gears
Got the combo set up in my 66 chevelle sedan, it has currently 2.73 gears. Im running a 3200 stall revmax convertor, 6.10" lift cam 2.23/2.39 duration on it....Will it really hurt anything to use the 2.73 gears? It should have great top end for sure....! opinions welcome...
Rick
Rick
Last edited by flywheel; 01-01-2013 at 10:55 AM. Reason: spelling
#2
It will work obviously, and give better milage. Many people on here suggest no higher (numerically) than 3:42 rear with a 4l6o as they simply useless in first gear.
#7
TECH Fanatic
Tire size will influence the choice, but I agree with the 3.42 or even 3.23. Since you need to change gears, you might want to consider a swap to the 8.5 axle. 3.50 is the closest to 3.42 for the 8.2 that would be stock in the 66.
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#9
Performance wise I dont think it will make alot of difference. I have a 71 skylark with a 455 and th400 that had 2.73s and I ran 14.01 at 97 mph. I change to 3.42s and ran 14.01 at 95mph. The car feels like it pulls alot harder with the 3.42s but I guess not. I would say with an overdrive go ahead an change them it will feel better for cruising.
#11
Launching!
I run a 3.73 gear with 26 inch tall tires, 327cid small block with fuel injection in my 68 nova and still only see 2450 rpm at 70 mph.As far as 1st gear being useless, I can tell you that
this is a perfect compromise between great acceleration and reasonable fuel economy. I average approx. 17 mpg on the highway with this setup.
this is a perfect compromise between great acceleration and reasonable fuel economy. I average approx. 17 mpg on the highway with this setup.
#12
Ive had 3.55's in several of my other cars, included my 71 w/6.0/4l80e in it now. So, I know it would be better with something like that, but was wondering if there was any real down side to the 2.73's. Ive just got it up and running and tuned but the 4l60e is now slipping so it's out and at the rebuilders now..But what few miles I did get to put on it it seemed to do fine. Didn't have any trouble breaking the tires loose even at 65mph..Course, the streets and tires are real cold now. Guess I'll just wait till I get it painted and back together to decide...
Tuner said it was doing about 170mph in 3rd on the dyno...yikessss
Rick
Tuner said it was doing about 170mph in 3rd on the dyno...yikessss
Rick