Allison Transmission

jfishgsxr · 02-23-2007, 03:11 PM

I work on these things everyday, if anyone has one in their trucks and are having problems with it and have a question or anything about them feel free to ask.

Purpdust · 02-23-2007, 05:36 PM

Can I put the 6 speed Allison in my F-250???

jfishgsxr · 02-23-2007, 05:47 PM

it can be done. It will take a lot of money. We are actually putting an allison in a cummins in our shop right now. Its the first one we've ever done. Its coming along slowly in our spare time. But yes it can be done but it will take a lot of money.

luvtolean · 02-23-2007, 06:21 PM

I believe the 5 spd in my truck is $6k...I can only imagine the cost of retrofitting the 6spd...

phobe · 02-23-2007, 06:25 PM

We had one blow up when I was running rental trucks (fully the client's fault) and it was over 10 grand to replace it.

(that's monopoly money though)

The 6-speeds are awesome.

jfishgsxr · 02-23-2007, 06:28 PM

there is nothing physically different from the 5 to 6 speed on the outside. actually you could make a 5 speed a 6 speed without even taking it out of the truck

phobe · 02-23-2007, 07:55 PM

Ya everything's the same but with an extra overdrive gear.

jfishgsxr · 02-23-2007, 07:59 PM

yea you would just have to change the control valve, nsbu switch, and the TCM.

luvtolean · 02-23-2007, 08:17 PM

Quote:

Originally Posted by jfishgsxr

yea you would just have to change the control valve, nsbu switch, and the TCM.

Unless I'm mistaken, that means you don't even have to change the output shaft, add a gear or anything?

How much would this cost, I'd love to make my 5 spd a 6 spd....

jfishgsxr · 02-23-2007, 08:33 PM

that is true. You all the gear ratio's are made with three planetary gear sets. There are five different sets of clutches in the 5 speed and there are five clutches in the 6 speed. They are labled C1 through C5. When two of these clutch packs are applied they make a certain gear ratio. For instance when C3 and C5 are applied it will change the direction of the output shaft and you will get reverse. When C1 and C5 are applied you will get first range or first gear whatever you want to call it. Its kinda hard to explain without seeing what Im talking about. So Allisons figured out they could make a 6th range or gear with ease. I dunno how much everything would cost parts wise for you to make it a 6sp. I can find out if u want.

CBR929RE · 02-24-2007, 01:41 PM

back when I was in school I had brought one of the buses up to the maintenance place where we leased them from. I was talking with one of the mechanics about the trannys for some reason (I think one of them was sitting on a pallete, those things were huge) and mentioned that one of the kids I had worked with over the summer said they blew up one of their trannys at Umass. the guy said "that's an allison, how the hell did they do that?"

jfishgsxr · 02-24-2007, 01:57 PM

lol yea they are good transmissions. Over all for the abuse that they go through they hold up very well

02-23-2007, 03:11 PM	#1
jfishgsxr Join Date: 02-12-2007 Age: 22 Bike(s): 06 GSXR 750 Posts: 31	Allison Transmission I work on these things everyday, if anyone has one in their trucks and are having problems with it and have a question or anything about them feel free to ask.

02-23-2007, 05:36 PM	#2
Purpdust Join Date: 12-19-2006 Location: AB-Canada/Rome Italy Age: 33 Bike(s): gsxr 750 Posts: 1,445	Re: Allison Transmission Can I put the 6 speed Allison in my F-250??? __________________ GSXR 750 - Track CRF450X - Dirt CRF100F - Soon to be a Mini Motard

02-23-2007, 05:47 PM	#3
jfishgsxr Join Date: 02-12-2007 Age: 22 Bike(s): 06 GSXR 750 Posts: 31	Re: Allison Transmission it can be done. It will take a lot of money. We are actually putting an allison in a cummins in our shop right now. Its the first one we've ever done. Its coming along slowly in our spare time. But yes it can be done but it will take a lot of money.

02-23-2007, 06:21 PM	#4
luvtolean Join Date: 12-13-2006 Location: SF Bay Area, CA Bike(s): 2008 BMW GS-A Posts: 6,308	Re: Allison Transmission I believe the 5 spd in my truck is $6k...I can only imagine the cost of retrofitting the 6spd... __________________ Someone needs to present the facts and the physics rather than just the rhetoric. Poor old Carmelo doesn't understand the physics of a motorcycle. - Jerry Burgess, on spec tires and changing engine rules

02-23-2007, 06:25 PM	#5
phobe circa 1960 Join Date: 12-17-2006 Age: 26 Bike(s): 600RR, 125R Posts: 4,629	Re: Allison Transmission We had one blow up when I was running rental trucks (fully the client's fault) and it was over 10 grand to replace it. (that's monopoly money though) The 6-speeds are awesome. __________________ Cum hoc, ergo propter hoc

02-23-2007, 06:28 PM	#6
jfishgsxr Join Date: 02-12-2007 Age: 22 Bike(s): 06 GSXR 750 Posts: 31	Re: Allison Transmission there is nothing physically different from the 5 to 6 speed on the outside. actually you could make a 5 speed a 6 speed without even taking it out of the truck

02-23-2007, 07:55 PM	#7
phobe circa 1960 Join Date: 12-17-2006 Age: 26 Bike(s): 600RR, 125R Posts: 4,629	Re: Allison Transmission Ya everything's the same but with an extra overdrive gear. __________________ Cum hoc, ergo propter hoc

02-23-2007, 07:59 PM	#8
jfishgsxr Join Date: 02-12-2007 Age: 22 Bike(s): 06 GSXR 750 Posts: 31	Re: Allison Transmission yea you would just have to change the control valve, nsbu switch, and the TCM.

02-23-2007, 08:33 PM	#10
jfishgsxr Join Date: 02-12-2007 Age: 22 Bike(s): 06 GSXR 750 Posts: 31	Re: Allison Transmission that is true. You all the gear ratio's are made with three planetary gear sets. There are five different sets of clutches in the 5 speed and there are five clutches in the 6 speed. They are labled C1 through C5. When two of these clutch packs are applied they make a certain gear ratio. For instance when C3 and C5 are applied it will change the direction of the output shaft and you will get reverse. When C1 and C5 are applied you will get first range or first gear whatever you want to call it. Its kinda hard to explain without seeing what Im talking about. So Allisons figured out they could make a 6th range or gear with ease. I dunno how much everything would cost parts wise for you to make it a 6sp. I can find out if u want.

02-24-2007, 01:41 PM	#11
CBR929RE Go Sox! Join Date: 12-18-2006 Location: at home Age: 28 Bike(s): 01 R/B/W CBR929RR Posts: 3,312	Re: Allison Transmission back when I was in school I had brought one of the buses up to the maintenance place where we leased them from. I was talking with one of the mechanics about the trannys for some reason (I think one of them was sitting on a pallete, those things were huge) and mentioned that one of the kids I had worked with over the summer said they blew up one of their trannys at Umass. the guy said "that's an allison, how the hell did they do that?" __________________ if you can't fix it with duct tape, you haven't used enough.

02-24-2007, 01:57 PM	#12
jfishgsxr Join Date: 02-12-2007 Age: 22 Bike(s): 06 GSXR 750 Posts: 31	Re: Allison Transmission lol yea they are good transmissions. Over all for the abuse that they go through they hold up very well