how to lower RPM

[ilovetrains]

I know what you mean about the towing, my tow rating can put me way over the GCVW rating. The truck can do it, but...



Usually a R&P set runs 250-350 for parts. I usually see prices of about 1K for parts and labor to doa 4WD truck. Even if the parts price were 1/2 more, that is still way cheaper than a GV over/under unit.

 

[bpenrod]

my GV would not allow me to use it untill i was already going 45mph. and would automaticly disingage if i went below 25mph with it on.

Something sounds different there, I can split 2nd to get 2nd Over as long as I'm moving 20 mph. It takes a full second to do the shift at slower speeds but it will do it.



I also looked hard at gear changes and decide the GV was more flexible and I can move the investment to my next truck with very minimal investment, somewhere around 100 bucks if a new transfer case adapter is needed. If I went to an auto I would need a new control box as well but I'll probably stay with a stick.



As for the US GEar and SWB I believe it applies to QC as well. The article in the past TDR mag (2 issues ago?) mentioned moving the transfer case back 13". On my QC SWB that put it right on the fuel tank. It was having to modify that and adding 13" to the front driveshaft that steered me to the GV.

 

[67guzzler]

American Axle & Manufacturing Got Back To Me!

Guys! Good News!!!



American Axle & Manufacturing got back to me. Earlier in this thread I posted 3 email exchanges with AAM. I was waiting to hear back. I wasn't sure that I would at all.



But I did. I have to give them credit. Here's their reply:



Mr. Gann,

DiamlerChrysler is aware of the fuel issue and is looking at a lower ratio. They would like 3:08 ratio but because of the ring gear thickness, the exciter ring location becomes an problem. AAM suggested to at least allow a 3:42 ratio that does help, but does not completely satisfy all of the requirements.



Note that this is still in design and not released for production or sale at this time.





Robert Dunn

Sr. Service Engineer

American Axle & Manufacturing

World Headquarters

One Dauch Drive

Detroit, Michigan 48211-1198



Some things to note:



1) DC has acknowledged there is a problem. So we can put an end to the debate that these trucks can only tow with a NV5600 w/4. 10 (. 73 x 4. 10 = 2. 993 final drive ratio) or a G56 w/3. 73 (. 79 x 3. 73 = 2. 9467 FDR). Slightly taller ratios can get the job done too and make for a better all around truck.



2) DC feels it's such a problem that they wanted to get AAM to come up with a 3. 08 Ratio!



3) AAM cares about this configuration problem's inefficiency too.



4) Don't hold your breath as it will be a while if and when something is done.



Overall I feel this is good news. I hope that DC & AAM can come to some understanding and maybe, even if it costs some money, we can get something that's better all around.



Just wanted to update you all.

 

[ilovetrains]

pendulem

Let's just hope they get something out soon.

 

[kah68]

I wonder if any Trans. specialty shops have looked at making a custom 6th gear upgrade for the G-56, or is it even possible? Maybe D. C. could redo the G-56 6th gear or better yet come up with a 7 speed with a double O. D. with both . 73 and a . 80? then you could have either 3:73 or 4:10 for hard core haulers.

 

[jryan11518]

Do the US Gear and Gear Vondor mods void the warranty?

 

[ilovetrains]

Guys! Good News!!!



American Axle & Manufacturing got back to me. Earlier in this thread I posted 3 email exchanges with AAM. I was waiting to hear back. I wasn't sure that I would at all.



But I did. I have to give them credit. Here's their reply:



Mr. Gann,

DiamlerChrysler is aware of the fuel issue and is looking at a lower ratio. They would like 3:08 ratio but because of the ring gear thickness, the exciter ring location becomes an problem. AAM suggested to at least allow a 3:42 ratio that does help, but does not completely satisfy all of the requirements.



Note that this is still in design and not released for production or sale at this time.





Robert Dunn

Sr. Service Engineer

American Axle & Manufacturing

World Headquarters

One Dauch Drive

Detroit, Michigan 48211-1198



Some things to note:



1) DC has acknowledged there is a problem. So we can put an end to the debate that these trucks can only tow with a NV5600 w/4. 10 (. 73 x 4. 10 = 2. 993 final drive ratio) or a G56 w/3. 73 (. 79 x 3. 73 = 2. 9467 FDR). Slightly taller ratios can get the job done too and make for a better all around truck.



2) DC feels it's such a problem that they wanted to get AAM to come up with a 3. 08 Ratio!



3) AAM cares about this configuration problem's inefficiency too.



4) Don't hold your breath as it will be a while if and when something is done.



Overall I feel this is good news. I hope that DC & AAM can come to some understanding and maybe, even if it costs some money, we can get something that's better all around.



Just wanted to update you all.

Any news on this? Just wondered what kind of timetable they were looking at for this.

 

[Trent]

Any news on this? I'm very curious.

 

[ilovetrains]

Any news on this? I'm very curious.

None. JGann ended up going with a larger tire to get the RPM's down.

 

[kah68]

Remember that any gear other than O. D. and fuel ecomony will suffer loaded or empty. I like the idea of a 7 speed with a double O. D. . 80 and . 73 or something in that neighbourhood. that way you still have direct for climbing big grades, a towing O. D. and a gear for running empty. Everday users ( lower % towing ) can opt for the 3:73 and the hardcore haulers can have their 4:10's. Maybe ever add a 3:42 option for those looking for higher speeds. I guess my point is , make one versatile trans that works for everyone, and give the customer some ratio options. This keeps things standard for D. C. While they're at it give us a 6 speed auto with double O. D. like G. M. did with the Allison!