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Thread: 5.9 Cummins with an Allison 1k/2k tranny?

  1. #1
    Garrett booster
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    5.9 Cummins with an Allison 1k/2k tranny?

    Anyone done this mod b4?

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    Supporting Member II Turbo Mopar Contributor DOHCRT's Avatar
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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Check TDR1.com. I'm pretty sure this has been done already, I know I would love to do it to my truck.


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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Asian Warner 6spd is the swap i want to do

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Did u read over on cummins forum? They ripped both asin trannies apart and said there not that great. I say nv5600 swap. Plus it's probably in the realm of affordable.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    I think I've seen 1 failed aisen in my 4 years at a dodge dealer.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    how much of an advantage is there when you can just put your transmission back together with improved parts? More gears?
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    The 68rfe is a 6 speed just like the aisen. The aisen has a PTO attachment, different gearing and its a little bit stronger. The only way you can get a new Cummins with 850 ftlbs is with the aisen.

  8. #8
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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    The 68rfe isn't exactly a 6 speed. Normal driving is only 5 with a kickdown gear. 3rd gear(2nd prime) gets used in autostick(ers) and kickdown.

    We have seen many aisin transmissions come In broken in stock 5500 rams, broken inputs, trashed clutches, ect. I would love to see a medium duty synchronized manual trans fitted that can handle the 850 ft lbs. The 650ft lb g56 trucks are pretty weak now that the auto trucks are pushing 900ft lbs.
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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by thedon809 View Post
    I think I've seen 1 failed aisen in my 4 years at a dodge dealer.
    i seen and rebuilt more Allison's (9 total) to the none Asian Warner 6spd in a dealership
    Last edited by bakes; 12-07-2014 at 06:07 PM.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by shackwrrr View Post
    The 68rfe isn't exactly a 6 speed. Normal driving is only 5 with a kickdown gear. 3rd gear(2nd prime) gets used in autostick(ers) and kickdown.

    We have seen many aisin transmissions come In broken in stock 5500 rams, broken inputs, trashed clutches, ect. I would love to see a medium duty synchronized manual trans fitted that can handle the 850 ft lbs. The 650ft lb g56 trucks are pretty weak now that the auto trucks are pushing 900ft lbs.
    A gear is a gear whether it utilizes it all the time or not. The 62te technically has 8 possible forward gears iirc but they don't use all of them. Its more or less a 42te with a compounder unit.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    I wasn't meaning that I think it's shitty or anything. Just saying from what I read it sounds like it's not going to live for very long in a high hp (modified) truck. Not that any trans will live to long unless it's beefed a bit to help with its harsh living environment.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by Spiritman View Post
    I wasn't meaning that I think it's shitty or anything. Just saying from what I read it sounds like it's not going to live for very long in a high hp (modified) truck. Not that any trans will live to long unless it's beefed a bit to help with its harsh living environment.
    Which is why I don't understanding wanting to go to a completely different transmission when the parts are available for fixing your OEM transmission and those parts will cost less than the top OEM transmissions in stock form.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by Ondonti View Post
    Which is why I don't understanding wanting to go to a completely different transmission when the parts are available for fixing your OEM transmission and those parts will cost less than the top OEM transmissions in stock form.
    The Allison is a perfect match with gear ratios and really wakes up a 6BT. I have only driven non-modified trucks with the 6BT/Allison 1000, so I can't talk about holding up to power. Most of the Allison problems were kind of like the 604, related to electronics.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Allisons have week 3 gear drop some higher than stock loads on it and they weld clutch packs without Mods

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by 94GTC View Post
    The Allison is a perfect match with gear ratios and really wakes up a 6BT. I have only driven non-modified trucks with the 6BT/Allison 1000, so I can't talk about holding up to power. Most of the Allison problems were kind of like the 604, related to electronics.
    The early 604's had way more problems than just electronics.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by thedon809 View Post
    The early 604's had way more problems than just electronics.
    I won't argue that, but alot of the early problems were caused by electronics. I would have rather had an automatic than my 6-speed in my 03, but I could not justify$4K on top of the price of a new truck, just to get one to hold up to planned power output. I would also argue that people are pulling far more weight than a pickup should EVER be pulling. I realize what they are rated at, but being safe to control, stop?????

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    I agree. If you are pulling 6500lbs and the truck is rated at 7,000lbs, it might be wise to get a bigger truck.

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by 94GTC View Post
    I won't argue that, but alot of the early problems were caused by electronics. I would have rather had an automatic than my 6-speed in my 03, but I could not justify$4K on top of the price of a new truck, just to get one to hold up to planned power output. I would also argue that people are pulling far more weight than a pickup should EVER be pulling. I realize what they are rated at, but being safe to control, stop?????
    Is your power goal reasonable or necessary? Simple converter and a few parts for 1000 or built to the hilt so you don't have to ever slow down up a grade...seems like a poor spending decision but one that the manly side of humanity always makes

    I am kinda tempted to buy a 6bt and not try to make much power over stock but light build the transmission so it will survive pulling fairly heavy loads long term, even if that means slowing down. There is one nasty hill right before Pacific Raceways and its a motor killer.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

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    Re: 5.9 Cummins with an Allison 1k/2k tranny?

    Quote Originally Posted by Ondonti View Post
    Is your power goal reasonable or necessary? Simple converter and a few parts for 1000 or built to the hilt so you don't have to ever slow down up a grade...seems like a poor spending decision but one that the manly side of humanity always makes

    I am kinda tempted to buy a 6bt and not try to make much power over stock but light build the transmission so it will survive pulling fairly heavy loads long term, even if that means slowing down. There is one nasty hill right before Pacific Raceways and its a motor killer.
    When I bought my 03 new, I was told that 50h.p. upgrade is about all the trans could handle, for a while. A friend of my put a converter, and a valve body in his 07 and pulls a 36' 5th wheel car hauler and has had no issues. He has BD upgraded power adders, and I would guess, it's not close to my Smarty in power. I don't need thee power, heck I don't even tow with it any more, but barking the tires in 4th, after a grampa shift, is fun. I don't know if $2500 would get you any more than a few bolt ons, and no billet parts.

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