Allison 5-6 Speed Conversion - Chevy and GMC Duramax Diesel Forum

Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

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post #1 of 20 (permalink) Old 10-19-2011, 06:45 PM Thread Starter
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Question Allison 5-6 Speed Conversion

Has anyone put the 5-6 speed conversion valve body in their allison? Is it worth the money?
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post #2 of 20 (permalink) Old 10-19-2011, 06:55 PM
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Never done it before but I'm guessing it's not worth the money. They are like what 2300 dollars plus your time and labor and if I can remember they only drop about 300 rpm seems like you'd have to do slot of driving at highway speeds to pay off 2300 dollars in fuel savings. I could be wrong though.

04 lb7 155k, 6 inch lift, Efi tuned by Idaho rob, Airdog2 165, Banks Big Head Waste Gate, Banks intake, ProFab intake horn, Batmowheel, Profab DP, Banks monster Dual exhaust. Built trans
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post #3 of 20 (permalink) Old 10-19-2011, 07:06 PM
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I think i have seen past threads on this, and believe everyone said it would not be worth it

Kyle
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post #4 of 20 (permalink) Old 10-19-2011, 07:23 PM
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Quote:
Originally Posted by kx500 View Post
Is it worth the money?
no its not

Your going to spend over 2 grand with labor and all to install, instead of building your transmission (assuming its not built) to cruise 150-200rpms lower at 70 mph ?

Josh

2006 CCSB 4x4 ZF6
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post #5 of 20 (permalink) Old 10-19-2011, 07:43 PM
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The kit is 1600.00. How in the hell do you figure 2K and over?
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post #6 of 20 (permalink) Old 10-19-2011, 07:44 PM
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Quote:
Originally Posted by Mike L. View Post
The kit is 1600.00. How in the hell do you figure 2K and over?
will you install the kit for $399.98 ?

If so im wrong

Josh

2006 CCSB 4x4 ZF6
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post #7 of 20 (permalink) Old 10-22-2011, 06:13 AM
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Quote:
Originally Posted by CaseBlackKnight View Post
I think i have seen past threads on this, and believe everyone said it would not be worth it

X2

Been asked before and unless you drive alot of unloaded highway miles you won't ever break even on the kit.
Much better to spend the money building your transmission to hold more HP/torque IMHO.

2005 Silverado EC/SB, LLY, 4WD, EFI DSP5 V2 (Idaho Rob at ATP), Edge CTS w/ EGT probe, LML Exhaust Manifold, PPE shimmed FPRV, Banks LBZ air cleaner, Profab intake, LBZ Turbo Mouthpiece, Kennedy twin lift pumps w/ megafilter, Corsa 304 SS Exhaust, Mike L tranny cooler, EXAXT Steering System, Redhead Power Steering Box w/ Amsoil PS fluid, Green Torsion Keys, Allison Deep Pan w/ Suncoast Filterlock and Transynd ATF, Bilstein 5100's (Norcal), Cognito UCA's, 17" NBS alloy rims, 265/70R17 Michelin LTX M/S2's, Pioneer AVH-P3200BT, CubbyCam Backup Camera, Pop & Lock Power Tailgate Lock, Extang Solid Fold Tonneau Cover, Tekonsha P3 Brake controller, Alphatherm AT-38OD Washer Fluid Heater

Last edited by MTL_Dmax; 10-22-2011 at 07:09 AM.
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post #8 of 20 (permalink) Old 10-22-2011, 06:53 AM
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There is NO pay-back on truck mods --- the wheels, tires, exhaust, lift,and etc-- all cost, and never "Pay-Back" anything. The best pay-back is -- leave it stock and drive it.

People buy and mod their trucks, because they have $$ to spend, it makes them feel good---------- and it helps the economy!

I love my 5-6 conversion, and it does reduce the cabin noise at cruise.

Disclaimer added-- The addition of the 6 speed, probably will not give much of an increase in fuel mileage.

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry

Last edited by jc1843; 10-22-2011 at 07:18 AM.
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post #9 of 20 (permalink) Old 10-22-2011, 07:09 AM
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Quote:
Originally Posted by jc1843 View Post
There is NO pay-back on truck mods --- the wheels, tires, exhaust, lift,and etc-- all cost, and never "Pay-Back" anything. The best pay-back is -- leave it stock and drive it.

People buy and mod their trucks, because they have $$ to spend, it makes them feel good---------- and it helps the economy!

I love my 5-6 conversion, and it does reduce the cabin noise at cruise.

While I agree with what you're saying, I just wanted to point out that fact to those who may be looking at it to bolster their fuel economy in the hopes of lowering their overall expenses (ie ROI or "payback"). If people want to add the kit for other reasons (lower highway noise, less RPMs on motor, just want one, etc), then I certainly wouldn't discourage it provided they are well informed before putting down their hard earned money.

2005 Silverado EC/SB, LLY, 4WD, EFI DSP5 V2 (Idaho Rob at ATP), Edge CTS w/ EGT probe, LML Exhaust Manifold, PPE shimmed FPRV, Banks LBZ air cleaner, Profab intake, LBZ Turbo Mouthpiece, Kennedy twin lift pumps w/ megafilter, Corsa 304 SS Exhaust, Mike L tranny cooler, EXAXT Steering System, Redhead Power Steering Box w/ Amsoil PS fluid, Green Torsion Keys, Allison Deep Pan w/ Suncoast Filterlock and Transynd ATF, Bilstein 5100's (Norcal), Cognito UCA's, 17" NBS alloy rims, 265/70R17 Michelin LTX M/S2's, Pioneer AVH-P3200BT, CubbyCam Backup Camera, Pop & Lock Power Tailgate Lock, Extang Solid Fold Tonneau Cover, Tekonsha P3 Brake controller, Alphatherm AT-38OD Washer Fluid Heater
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post #10 of 20 (permalink) Old 10-22-2011, 07:20 AM
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Agreed and added a note!

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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