Duramax Diesels Forum Truck of the Week
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Old 09-10-2018, 08:17 PM
sam_rork sam_rork is offline
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Default Allison 5 speed to 6 speed conversion

Thinking about building my 5 speed transmission to handle my current modifications to my truck then ran across the 6 speed conversion kit. Would this be the better option over a built 5 speed tranny? I’m mainly looking for fuel mileage On the highway and not tearing up my tranny when I want to have some fun.


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Old 09-10-2018, 09:19 PM
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The 5-6 speed conversion will not allow you to put any more power down without building the trans. If you need a built trans to handle your power then build it, if you want the 6 speed then add the conversion to the built trans. Then you’ll have both.

I just did the 6 speed conversion in my 02, should have done it 10 years ago.
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Old 09-11-2018, 05:16 AM
sam_rork sam_rork is offline
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Thank you that was my next question. I think that’s the route I’ll go. Conversion then rebuild.


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Old 09-11-2018, 06:52 AM
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Originally Posted by sam_rork View Post
Thank you that was my next question. I think that’s the route I’ll go. Conversion then rebuild.


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Old 09-11-2018, 07:33 AM
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Originally Posted by Mike L. View Post
You're doing this backwards.
X2, make the trans hold the power, then do the 6 speed conversion. The 6-speed conversion doesn't require removing the transmission, just the valve body, and can be done fairly easily at any time.

It is also possible to build the transmission and do the 6 speed kit at the same time, and you will save a little bit on labor this way. That is what I did in my Suburban.
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Old 09-11-2018, 11:27 AM
sam_rork sam_rork is offline
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What would cost be for building the 5-speed? I believe for my mechanical abilities I could do the conversion kit but how intense would the rebuild be for an individual that doesn’t work on Allison Transmissions every day be?


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Old 09-11-2018, 03:11 PM
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What would cost be for building the 5-speed? I believe for my mechanical abilities I could do the conversion kit but how intense would the rebuild be for an individual that doesn’t work on Allison Transmissions every day be?


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If everyday means that you never did rebuild an Allison and you might have the ability to bolt on a valve body , you might wont to contact one of the great transmission guys on this site. Unless you love a challenge , then go for it !
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Old 09-11-2018, 03:17 PM
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Still wondering on cost ($) valve of the project? Anyone have any recommendations on who to go with doing a project like this in the Kansas area?


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Old 09-11-2018, 03:22 PM
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Still wondering on cost ($) valve of the project? Anyone have any recommendations on who to go with doing a project like this in the Kansas area?


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AFE Blade Runner,AFE Momentum CAI,DHD Big Air intake Y pipe, DHD fuel block,DHD pcv reroute,MBRP 4 inch exhaust,DHD 3 inch downpipe,BD driver's side manifold,DHD pass side up pipe,DHD 3 inch intercooler hot&cold pipes, ATI damper,Empire pin kit by Big Foot on & off road shop, FASS fuel system,5/8 inch pickup, FASS fuel filter delete, EFI live,V2 & lap top , 5 position switch 250 hp big tune, shimmed fprv by Crank it up , built SunCoast Allison 1078 converter aftermarket trany mount by Limitless Diesel,ARP head studs,grade C gaskets,tig-welded water pump,T stats by Blackout performance,MA t case brace , Kriptonite motor mounts,MA pump rub kit,HD drive shaft 1480joints by Greensburg machine,BDS Recoil traction bars, PPE finned deep pan , Mike L trany cooler, PSC pump, 5100s, Sulastic Shackles, Curt com 2.5 hitch
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Old 09-12-2018, 09:29 AM
trjanousek0802 trjanousek0802 is offline
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Default Allison 5 speed to 6 speed conversion

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Originally Posted by torqued2dmax View Post
Call the guy in sheeps clothing !


Ok I do not find this comment very helpful? He is wanting to know if you do a 6 speed conversion. Can you then rebuild it as a six speed? Because a 6 speed rebuild is a lot cheaper then a 5 speed. Again looking for help not sarcasm. Thanks



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Old 09-12-2018, 09:39 AM
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Originally Posted by trjanousek0802 View Post
Ok I do not find this comment very helpful? He is wanting to know if you do a 6 speed conversion. Can you then rebuild it as a six speed? Because a 6 speed rebuild is a lot cheaper then a 5 speed. Again looking for help not sarcasm. Thanks



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use the search function and start reading.
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Old 09-12-2018, 09:49 AM
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Quote:
Originally Posted by trjanousek0802 View Post
Ok I do not find this comment very helpful? He is wanting to know if you do a 6 speed conversion. Can you then rebuild it as a six speed? Because a 6 speed rebuild is a lot cheaper then a 5 speed. Again looking for help not sarcasm. Thanks



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There was no sarcasm posted. Who ever told you that a 6 speed was cheaper to build than a 5 speed?
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Old 09-12-2018, 10:01 AM
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Originally Posted by sam_rork View Post
Still wondering on cost ($) valve of the project? Anyone have any recommendations on who to go with doing a project like this in the Kansas area?

Conservatively $5-6K if you have a shop build it. LOOK IN OUR VENDOR SECTION for MikeL (Inglewood Transmissions) or Evan (Limitless Diesel Perf) for their phone numbers and call them about your options. Evan sells a kit if you want to do it yourself. I am not sure if there are any competent shops near you to do the build.


Quote:
Originally Posted by trjanousek0802 View Post
Ok I do not find this comment very helpful? He is wanting to know if you do a 6 speed conversion. Can you then rebuild it as a six speed? Because a 6 speed rebuild is a lot cheaper then a 5 speed. Again looking for help not sarcasm. Thanks


How about you do some searching and reading around here before opening your mouth? "The guy in sheeps clothing" is MikeL. So torqued's post was helpful.
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Old 09-12-2018, 10:19 AM
trjanousek0802 trjanousek0802 is offline
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Default Allison 5 speed to 6 speed conversion

Quote:
Originally Posted by TheBac View Post
Conservatively $5-6K if you have a shop build it. LOOK IN OUR VENDOR SECTION for MikeL (Inglewood Transmissions) or Evan (Limitless Diesel Perf) for their phone numbers and call them about your options. Evan sells a kit if you want to do it yourself. I am not sure if there are any competent shops near you to do the build.



How about you do some searching and reading around here before opening your mouth? "The guy in sheeps clothing" is MikeL. So torqued's post was helpful.


So then explain the Statement “The guy in sheeps clothing” because that was very confusing and misleading to us that had no idea what that means and for being new to this “Tapatalk”. But thanks for explaining who it is and about the “Vendor Selection”.


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Old 09-12-2018, 10:31 AM
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Its a long time joke concerning Mike, so leave it at that. Not our problem that you dont understand it.
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"BBT" -- 2003 GMC CC/SB 4x4 12.14@111.15
"The Cruzer" -- 2014 Chevy Cruze Diesel -- the fun little DD
"Kleshay" -- 2000 C5 Corvette -- the toy
"The Bigger Boat" -- 2011 Workhorse P700 - 6.0LS/Allison - what I drive at work


Two wrongs dont make a right, but three rights do make a left.

Reality is a matter of perspective.

This forum isn't for the weak of heart.....or wallet.

"Lets build a race car they said. Itll be fun they said. I don't know who "they" are.........but they need a good punch in the face!" -- mufflerguy (yb)
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