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  #41  
Old 04-03-2012, 07:47 AM
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^ I thought you originally had 3.55? Maybe I am not remembering correctly...
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  #42  
Old 04-03-2012, 12:15 PM
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Quote:
Originally Posted by KarateManAZ View Post
Well did the track Sat night and no bueno on the gears for me. We did have much higher DA and that affected me as well. I believe i blew through my boost range too fast with the 4.56's. I lost 4 tenths and 3mph at the top end. 60ft was the same...
That is good and bad news... At least now you know and everyone else. Dont think i will be getting 4.56's may just stick to 4.10's.

Let us know if anything changes.
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  #43  
Old 04-03-2012, 12:33 PM
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x2,
High DA is one thing, but if it fell on its face going into overdrive before the traps, that's going to hurt you every time.

Run it a couple more times,
1) try using 2nd prime (manual shifting)
2)see if you can borrow a taller DR from someone
3) take note of what gear/rpm your at when your approaching the finish line each time.

I think a 4.30:1 would be the answer, but that isn't going to happen unfortunately
So you may have to go 4.10's or change tires to a 30".
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  #44  
Old 04-03-2012, 09:02 PM
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We had some nasty DA/Temps last Sat. Normally if I correct my times on dragtimes it bumps 1 tenth off but I corrected it and it took about 4tenths off... So honestly I don't think I gained anything or lost anything. I was also running with more weight than the 12.5 slip, So I'm not totally bummed out/let down by the gears but I have to say was expecting more from the 4.56's
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  #45  
Old 04-03-2012, 09:10 PM
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Don't worry, you still have one of the coolest rams around

So did you have 3.55 or 3.92 originally? You'd probably be better off with 4.10's or if you already have 3.92's laying around then just go with that...
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  #46  
Old 04-03-2012, 09:16 PM
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I had 3.92's before the swap.

It's funny At the track the truck was feeling a little slugish all night but on the way home at 2:00am it felt like a completely diff truck. The Temp had dropped 20+ degrees when I drove home from my buddy's house.
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  #47  
Old 04-03-2012, 09:24 PM
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That is strange. A sluggish feeling due to a temperature drop should be more noticeable with higher gearing than lower gearing...or at least that makes sense to me.
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  #48  
Old 04-08-2012, 06:42 PM
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Did you ever decide what gears your gettin? Im sure im going to be changin mine soon so it would help to see whats best. Have you tried lookin for some 4.30s? Idk what ratios are available
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  #49  
Old 04-08-2012, 09:26 PM
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4.30 would be a no-brainer, but that's not an option for a Chrysler 9.25 diff.
It all comes down to the number of teeth on the pinion in relation to the number of teeth on the ring gear.

as a result I'm afraid I'm faced with settling for 4.10's
or going to 4.56's and needing to buy 4 new DR's that sit about 29"-30" tall.

The key is definitely to stay out of 4th gear before hitting the traps.

I cant do any track testing or detailed calculations until I get back to the track,
I need to know my exact RPM's at the line but our track doesn't open until April 27th.

My effective gear ratio with 3.55's and 27" DR's is about 4.30:1
I believe I'm 4400-4600 rpm in 3rd gear, but not 100% sure.
If I can get to 5800 in 3rd with 4.56's and my current tires, that will be the determining factor.

If I'm wrong and I shift into 4th. I'll be in overdrive at 3000 rpm at the traps, and have to shop for new tires.

I may scrap the entire gear swap and just add a rear LSD, then spray it
Why struggle for mid/low 13's when I can get 12's for less $$$.

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Last edited by BlackRamHemi; 04-08-2012 at 09:41 PM.
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  #50  
Old 04-09-2012, 04:30 PM
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Quote:
Originally Posted by BlackRamHemi View Post
4.30 would be a no-brainer, but that's not an option for a Chrysler 9.25 diff.
It all comes down to the number of teeth on the pinion in relation to the number of teeth on the ring gear.

as a result I'm afraid I'm faced with settling for 4.10's
or going to 4.56's and needing to buy 4 new DR's that sit about 29"-30" tall.

The key is definitely to stay out of 4th gear before hitting the traps.

I cant do any track testing or detailed calculations until I get back to the track,
I need to know my exact RPM's at the line but our track doesn't open until April 27th.

My effective gear ratio with 3.55's and 27" DR's is about 4.30:1
I believe I'm 4400-4600 rpm in 3rd gear, but not 100% sure.
If I can get to 5800 in 3rd with 4.56's and my current tires, that will be the determining factor.

If I'm wrong and I shift into 4th. I'll be in overdrive at 3000 rpm at the traps, and have to shop for new tires.

I may scrap the entire gear swap and just add a rear LSD, then spray it
Why struggle for mid/low 13's when I can get 12's for less $$$.

I found a 4.10 rear end setup for 1200$ on the online mopar store. Went by the dealership to confirm what exactly it was that I would be receiving because it seemed cheap. And turns out to be everything you need for a gear swap. 1200$ aint bad. Im running 3.55s as well. I plan on swapping to 4.10s as my last mod on my truck.

I run the exact same tire as you when at the track. MT drag radials. just a different wheel.

Now that i saw those wheels (Your track wheels) on your ram. I may have found the set of wheels ive been searching for to put on mine
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