Ok how bad really are 3.73 going to be in my twin turbo 408 or 427 m6.
06-13-2007, 11:47 PM
#1
Ok how bad really are 3.73 going to be in my twin turbo 408 or 427 m6. I can get 3.54 gears or 3.73 in my dana 60. How bad really are 3.73 going to be in my 408 or 427 APS twin setup in an m6. There is a possibilty I might also go to like a 480le or 465 auto or whatever down the road.
I would think 3.73 will be good off boost. My car is not a 1/4 mile queen so not really worried about that. So will my spool up suck or something with 3.73s. Traction well realize traction is going to be hard to come by. But thats ok.
I would think 3.73 will be good off boost. My car is not a 1/4 mile queen so not really worried about that. So will my spool up suck or something with 3.73s. Traction well realize traction is going to be hard to come by. But thats ok.
06-13-2007, 11:52 PM
#2
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Id go the 3.54s or lower!With that much motor and twins 3.73s will not be good at all.Especially if your car is a street car.I run 3.42s with a th400 trans and am going 3.25s with my new 9inch.My car gained tons going from 4.10s to 3.42s
06-14-2007, 05:44 AM
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It depends on how much power/boost you are running. If your car isn't a 1/4 mile car I would think 3.73's would be optimum. I have them in my car. It runs good in the 1/4 and from a roll. With sticky tires it doesn't have any traction issues.
06-14-2007, 06:42 AM
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My GTT kit is on the way to me and i have 408ci in my car and iam going to posh it to 18 PSI i need to see 900+ and i need to get to the 9 secand 1/4 mile .what do you guys think that i should have in my 12 bolt moser what i have right know is 3.43 and i have new 3.73 i didnt install it yet some peopel telling me that to keep the 3.43 and some telling me to pot the 3.73 and i still have my M6 on it .what do you guys think.
thanks.
thanks.
06-14-2007, 08:18 AM
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most would suggest a low gear with your setup. 4.10's are more are something you see with guys running centrifugal superchargers. your spooling from a stop so your just going to blow the tires off with something like 3.73's.
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06-14-2007, 08:29 AM
#8
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With the cubes you plan to run, and the power you will make, you don't need gear... I'd go 3.54, because that increase to 3.73 is useless on the street, and might just push you a little out of the efficiency range of your combo.
06-14-2007, 09:22 AM
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my car is going to be a street only TT setup... i watned 3:23 but that's not available for a 12 bolt... so i went with a 3:08 gear and a detroit true trak diff.... i'll be able to tell you the results within the next week
06-14-2007, 11:19 AM
#19
Ok I plan on running dana 60. 3.54 is lowest gear available. So the 3.54 should be fine for my clutch also?Thought 3.73 might make clutch a bit easier to use but maybe cause its still got low miles its a bit touchy still.About 250 miles on it. I guess pretty much will run the 3.54 and I might get an auto later but again not going under 3.54 with the dana. and like the danas.One serious rear end with 35 spline and huge ring gear.
Still like a bit better explanation from you turbo guys. I don't much care about traction.might run et street radials most of the time as car is not a daily driver but not a track car ,street car 99%. Don't care about mileage,don't care about engine rpm and wear. Only care about what the diff would be in performance in normal driving not if my track mph would be a few mph lower .Will it not build boost or stay in boost well with 3.73.What actual effect does it cause in turbo cars. And assume my car being twin turbo and fairly small turbos it would start spooling at 2000 and be full in at 3000 with a 408 or 427.
Still like a bit better explanation from you turbo guys. I don't much care about traction.might run et street radials most of the time as car is not a daily driver but not a track car ,street car 99%. Don't care about mileage,don't care about engine rpm and wear. Only care about what the diff would be in performance in normal driving not if my track mph would be a few mph lower .Will it not build boost or stay in boost well with 3.73.What actual effect does it cause in turbo cars. And assume my car being twin turbo and fairly small turbos it would start spooling at 2000 and be full in at 3000 with a 408 or 427.
06-14-2007, 11:26 AM
#20
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Yes, that is the one draw back on the Dana 60's .... can't go any higher than 3.54. Maybe someday they will start to make some 3.2x's or 3.0x's gears for them now that they can bolt in all the A's, B's, F's and G body GM stuff.