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Hi Diego,
I don't know what engine combo you are running, maybe you feel like you need/want the 3.42's with the 2.87 1st gear in the 600?
Have you considered changed rear gear ratios? Maybe a 3.27 or 3.08 rear gear with the .82 would drop your RPM at cruise speeds. Again, maybe you need the 3.42's. But, in a light car, if you have enough low RPM torque, the 2.87 1st and 3.27's or 3.08's are plenty!
The original owner of my build had a 3.73 in the IRS, he was planning on a SBF/auto. I changed plans and went with FE/600 w/.82, so I changed from 3.73's to 3.27's, and I avoided the wide gap between 4th & 5th.
If you decide to swap 5th gears, Mike Forte is a fine guy to deal with! I got all my tranny stuff from him.
Good luck!
__________________
Wideglidejoe
FFR#6143 Mk III: FE 462" w/four 48 IDA Weber's w/TKO 600 .82, IRS w/3.27, 17" Team III's w/245/45's & 315/35's. Gas N's.
Picked it up end of Aug '08
First start May 12, '10
First go kart May 26, '10
Tag & title 5-26-11, driving in gel coat
Painted Nov 2015
'05 Harley Wide Glide (60 hp stock, now 107 hp & 107 ft/lbs at wheel. Mid 11's in the 1/4 mi.)
'55 Bel Air hot rod project (WIP)
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