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According to the July issue of Car Craft, Keisler Automotive Engineering (keislerauto.com) is selling Viper T56 transmission kits for late mode 5.7L and 6.1L Hemis. Didn't see it listed on their website yet. Something for the roadracers on the forum?

Rick
06 Silver SRT-8 D1 5/27 ship date
 

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I think this is meant for street rods or pickups. Doing this on an LX will probably require mass tunnel mods, custom pedals, hydraulic clutch, etc.
 

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Holy thread revival!

I know this is a dusty thread from the archives, but has anyone seen or (more to the point) driven one now?

Just curious.... hell I don't even have the damn car (yet) :biggrin:
 

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I don't believe that anyone that I know of has the 6 speed in the car, but it was shown in several rags since then. No major mods to tunnel etc that you would think. Plenty of room for the clutch pedal, the stick fits right in where the auto shift goes and looks perfect etc. Only about $5k to do it.
 

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Yeah, recent calls have gotten the response that the kit has been pushed back to some indeterminate time frame in 2008. There was also a mention somewhere that due to gearing, the test car was using up clutches pretty fast.

Since theres no gears on the horizon, this might explain why the kit was pushed back, they are hoping for gears to become available.
 

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Yeah, recent calls have gotten the response that the kit has been pushed back to some indeterminate time frame in 2008. There was also a mention somewhere that due to gearing, the test car was using up clutches pretty fast.

Since theres no gears on the horizon, this might explain why the kit was pushed back, they are hoping for gears to become available.
That sucks, hmm.....gears in the future when a certain challenger gets released with a 6 speed in it based on the same platform....yeah I'd say that would make it easier to get a 6speed to work, lol. Funny thing is they put it in the magazines like it was fully operational and worked perfectly.
 

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They had a thread going at Charger forums for over a year now, even became a supporting vendor later on, and I thought everything was a go with this. The pics of the kit looked impressive too. Guess they ran into unexpected problems.

Project SRT 6-SPEED - STICK IT or NOT? - Dodge Charger Forums

Rambit
 

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My old man has a six speed vette..and I debated putting one of the C3 vette kits from keisler in my corvette but I would never go with a 6sp. The over drive is a .5:1 ratio and useless for anything but lazy cruising. The first gear is too deep and the overdrive too tall. 6 sp sounds sweet but it was done for gas milage and I wouldn't have it. The TKO 600 was a much better transmission...700lbft of torque and a .64 od.
 

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Well in my opinion only SRT8 that I would put or want a 6 Speed would be the Charger (Current SRT8s, not talking about the Challenger) but then I want it in 2 door trim as well if that was the case, and oh yeah would lighten it a whole lot with taking the rear seats and etc..LOL

I've driven a 6-Speed for over 15 years and I don't really miss it. Tho I would not buy a sport car without one, but then the 300C SRT8 I personally consider it a Sports Sedan! hehe..
 

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My old man has a six speed vette..and I debated putting one of the C3 vette kits from keisler in my corvette but I would never go with a 6sp. The over drive is a .5:1 ratio and useless for anything but lazy cruising. The first gear is too deep and the overdrive too tall. 6 sp sounds sweet but it was done for gas milage and I wouldn't have it. The TKO 600 was a much better transmission...700lbft of torque and a .64 od.
That's why you'd need to run 3.73s or 4.10s to really make it work right. That's what the Impala SS guys do when they run the T56.
 

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That's why you'd need to run 3.73s or 4.10s to really make it work right. That's what the Impala SS guys do when they run the T56.
I agree except you would have to start in second gear 90% of the time unless you were launching hard at the track. 1st gear is really deep and your shifting into second as soon as you get the clutch enguaged...and that is with his stock rear( about a 3:08 I think)
 

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if a kit was availiable that was reliable right now, i would have a 6spd 300c srt8. It would be the perfect combination of luxury and performance for me...

-Z
 

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I agree except you would have to start in second gear 90% of the time unless you were launching hard at the track. 1st gear is really deep and your shifting into second as soon as you get the clutch enguaged...and that is with his stock rear( about a 3:08 I think)
I thought by deep you meant tall, but now I realize you meant short. In my experience, the T56 has a fairly tall first gear. Taller than the 1st on the 4L60. The whole range is taller, from 1st to 6th. There WERE T56s with shorter 1st gear ratios, but those are rare. The most common T56s in Vipers and Camaros all had similar gear ratios, to my knowledge. First was something like 2.66:1, which is definitely NOT for stump pulling, with the 0.5:1 6th. Which is why going to shorter diff gears pretty much makes everything normal.
 

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from keisler's own page...

T-56 double overdrive 6sp transmission (2.97 1st, 2.07 2nd, 1.43 3rd, 1.00 4th, 0.84 5th, 0.56 6th).
 

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T56 TREMEC 6speed

Wow, I was right about the 2.66 on Camaros and Vipers. Yay for me.

Sounds like the Camaro/Viper T56 ratios would be advisable on these cars, then just switch to something in the 4.00 range for diff gears and that's it.

For reference, the A580 has a 3.59:1 1st, which is ridiculously short. That means ANY T56 that I know of will be TALLER in 1st than the A580. Meaning the 2.66:1 1st on a T56 will bring an SRT-8 all the way to 65mph! Even the Keisler 2.97:1 1st would bring you to 58mph. Hence the need to change the diff ratio. Assuming you wanted to retain the same 1st gear range (48mph), you'd need to go from 3.06 in the back to a 4.13 on a Camaro/Viper T56, or a 3.70 on a Keisler T56. Then the first gears will be identical.
 
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