Will I ?
aloha,Tony C.tony c said:We advise our customers not to go any taller then 3:73 for street applications. The stock C4's limited breating ability and lack of traction makes a 4:10 gear an overkilll street mod.
Thank you so much for that great info! I think I'll be going with 3.73 when my pocket book fattens up.moore_rb said:Hey Patrick-
when I was with GM in the 90's we built a number of GS performance test mules that had 3.73 rears. In fact, there were internal rumblings that the GS was going to feature a 3.73 option. I think the reason it did not go through was the fact that the ZF transmission would have needed an expensive re-design to meet durability because the car now used 6th gear more frequently. From a performance standpoint the 3.73 was the best "balanced" performance option for the LT4 (all our testing was done on street tires.)
IMO it is worth it to move up from 3.42 to 3.73. You will feel the difference. I'm digging hard into the memory banks here (our testing was taking place in late 93/early 94) but I seem to recall Heinricy pulling 0-60's in the mid 4's in these cars with stock LT4's. GM doesn't do any formal 1/4 mile time testing, but our informal stopwatch tests suggested low 13's/high 12's on street tires. I wouldn't worry about the transmission durability issue because our test requirements were really far outside the realm of "normal and sane" day to day driving; our test transmissions were failing after the 20,000'th mile of sustained 150mph in 6th gear, etc.
I have 4.11's in my C5, and some times I wish I had gone 3.73. My car required a good deal of practice before I could launch it on street tires without excessive wheelspin. I don't think my car has a significant performance edge over a 3.73 equiped car, and I might even lose a few races to a car with 3.73's due to the touchier launch characteristics of my car.
Just my .02