Quote:
Originally Posted by Ace23
I'm having a bit too much fun driving right now to pull the motor. I am considering a gearing change. I run 315/35/17 and I have a TKO-600 .82 with a 3.31 rear gear. I think going to a different gear could really take advantage of the current cam in the car for right now.My car does not buck but it likes to be about 2000+ when cruising. I am leaning towards 3.91 ratio and possibly going with a .64 5th gear. The gearing calculator shows 38mph-48mph in 4th between 2000-2500rpm and 5th will give me 59mph-74mph between 2000-2500rpm. That seems like a pretty good mix of back road and interstate speed. Does anyone run this combo or having any advice? The .82 does not really work out too well with anything much higher than 3.46. I loath driving down the road at 3000rpms when cruising so the .64 is pretty attractive to me. I wouldn't completely rule out 4.10's either......I think the largest issue will be traction as the current setup is 590HP / 570TQ. Just an inexpensive way to make the car feel a lot faster and it could use more gear for sure.
Thanks
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I have a 26.3" diameter tire and a TKO 600 with the .64 5th gear. When I got the car it had a 3.5 rear end.
In 4th gear I tacked 2550 rpm at 57 MPH -- this is getting loud (typically drove 50 if no traffic so I could talk to the wife)
In 5th gear I tacked 1625 rpm at 57 MPH -- Quiet - careful on the throttle! Don't get it bucking) dang it shift back to 4th.
In 5th gear I tacked 1850 rpm at 65 MPH -- not happy until you get a speeding ticket
My engine will not run well below 1800 and it would prefer 2000.
I changed to a 3.92 rear end ratio
In 4th gear I tacked 2850 rpm at 57 MPH -- wow is this loud. Amazing the difference 300 rpm makes
In 5th gear I tacked 1825 rpm at 57 MPH -- quite and manageable
In 5th gear I tacked 2000 rpm at 62 MPH -- engine loves the highway
Basically I went from a useless 5th gear to a useless 4th gear, by choice. I felt that was the best compromise, as I can drive 55 MPH in 5th gear.
I hate the .64 5th ratio. They should call it 6th gear cause there is no 5th gear. I hate the huge rpm change from 4th to 5th. I had to rebuild the rear end, as I had a bad bearing, and it was cost effective and simple to change the ratio. It's a lot better than it was, but I would still prefer the .82 5th gear. If I do change to the .82, I will change back to the 3.5 rear end.