opinion on gear swap.
opinion on gear swap. Current setup is carbd 347 w/ th400 and 456's on a 28" tire, planning to swap gears out this winter and set the car up for a healthy dose of n2o (200+) was wanting some input on what size gear to run, I'm torn between 373 and 411. Would like to come thru the traps around 7400/7500. W/ the online calcs it says 411 will come thru at about 152mph, and 373 would be 167 before I run out of gear. Suggestions? I can post this in the n20 section if this isn't the approproate spot.
There are people more exp then me to answer but just curious what type of 28" tall. a Radial or perhaps a Bias Ply?
That may help a good deal. The car sounds like a lot of fun.
That may help a good deal. The car sounds like a lot of fun.
Converter slip will play a roll also, best to leave some wiggle room. Apples to oranges comparison between our cars but my car "could do" 135-140 in the 1/4 N/A but on nitrous....105 is topped out lol.... 4% slip NA/22% on the bottle. Just something else to take into account if you havnt thought of it yet
22% slip on the jug is terrible fwiw...
If you're thinking about the 4.10 vs 3.73, I'd try splitting it, try a 3.89/3.90 depending on what rear you have.
Seems to be a happy spot... I tried the 4.10 with my old 402 motor, swapped to 3.73 and it seemed to be a little too much. I had a converter in the car that was about 4% on the top end for slippage with roughly 600 rw with the nitrous on fwiw, and the car was going about 142 to 143 depending on the day/weather/track. 3350 lbs.
If that setup was still together I would have tried getting the converter to about 5% on the top end and loosen it up on the bottom a little, or put the 4.10, or a 3.90 back into it after I had gotten it down to about 3000. That would have probably gotten about as much out of it as I could without adding more power.
If you're thinking about the 4.10 vs 3.73, I'd try splitting it, try a 3.89/3.90 depending on what rear you have.
Seems to be a happy spot... I tried the 4.10 with my old 402 motor, swapped to 3.73 and it seemed to be a little too much. I had a converter in the car that was about 4% on the top end for slippage with roughly 600 rw with the nitrous on fwiw, and the car was going about 142 to 143 depending on the day/weather/track. 3350 lbs.
If that setup was still together I would have tried getting the converter to about 5% on the top end and loosen it up on the bottom a little, or put the 4.10, or a 3.90 back into it after I had gotten it down to about 3000. That would have probably gotten about as much out of it as I could without adding more power.
Not trying to hi-jack, but mine was set for 1/8th only. 105mph@3500lbs seems to be right on par for similar set ups. I was more concern'd with N/A times then nitrous. FTI said to leave the converter alone since I'll be yanking some weight out of it this winter which will effectively tighten the converter up some
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I just looked that up you're right it is only for the 3 series carrier my bad on that.. I wasn't aware that it wasn't an option for both.
In that case I would put the 4.11 in the car and if you have to, you could always put a 29 inch tall tire on if you find the car running out of gear.
In that case I would put the 4.11 in the car and if you have to, you could always put a 29 inch tall tire on if you find the car running out of gear.
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Verdad Gallardo Not trying to hi-jack, but mine was set for 1/8th only. 105mph@3500lbs seems to be right on par for similar set ups. I was more concern'd with N/A times then nitrous. FTI said to leave the converter alone since I'll be yanking some weight out of it this winter which will effectively tighten the converter up some
There ya go... who'd have thought to call the gear manufacturer LOL! Good work on that.. now anyone that's looking for the gearset for the 4 series carrier, knows where to go.
You have a 12 bolt I assume with the 4 series right? Just want to confirm we're not talking about wasting time with a factory rear.
You have a 12 bolt I assume with the 4 series right? Just want to confirm we're not talking about wasting time with a factory rear.
Moser junk 12 bolt w/ 4.56 and eaton posi, now about to be spool w/ 3.90. And yes 4 series carrier.. I'll post the part number for the gear when I get it for reference.
Ps posi and 456 gearset will be forsale soon if anyones interested pm me.
Ps posi and 456 gearset will be forsale soon if anyones interested pm me.
