G56 tow rating

[REndres]

Tried to get dealer to verify gcwr for a 3500srw with G56 6 speed and he got more confused than I did. The current info for 6speed shows 21,000 for 3. 73 rear and 23,000 for 4. 10 rear. I told him the G56 only came with 3. 73 but final drive ratio was same as NV5600 with 4. 10 (based on forum info). His book showed G56 available with 3. 73 and 4. 10. He said use the rating for the NV with 4. 10. I am not woried about capability but legality. Does anybody know what ratings are for a 3500 srw G56 6speed are?

 

[klenger]

GCWR has nothing to do with being legal. It is not a published number. Just make sure you are under the GVWR if you are concerned with being "legal".

 

[REndres]

GCWR has nothing to do with being legal. It is not a published number. Just make sure you are under the GVWR if you are concerned with being "legal".

Do you meen not a published number as in not on the door sticker and if you get checked by law inforcement they only put the truck axles on the scale an check your gvw. Are weights such as GAWR, GCWR and maximum trailer weight,( wich I found published on the Dodge web site and on your web site) only suggested weights. I realize you usally will max out GCWR before other ratings but I would like to know all the numbers to make a decision on a purchase. I appreciate and respect your input.

 

[67guzzler]

Ok -- Just went outside and looked at my door jamb. If I read it right the GVWR was 9000 lbs. Front axle was 5300lbs. and rear 6100lbs. I didn't see a mention of the GCWR. I'd imagine that a G56 3500 SRW would be more but I don't know... .

 

[Tim]

23,000 GCWR, but you'll likely overload the GVWR before you hit it.

 

[klenger]

By unplublished, I mean that it is not on the door jam and the info is not readily available to any law enforcement people. They certainly aren't going to get on the internnet and search for it, and Dodge only published the information on the internet for the current model year. GCWR is all about warranty.



Tim, where did you see the 23,000 lb rating? Is that the same rating as a 48RE with 4. 10's?

 

[AlexWV]

Check here.

http://www.daimlerchrysler.ca/EN/DODGE/PDF/ram2500_towing.pdf



It doesn't differentiate between G56 and NV5600. Also... on 2500, there is no difference in GCWR between 3. 73 and 4. 10.



So if you go by that chart, G56 or Auto with 3. 73 has GCWR of 21,000 if 3500 and 20,000 if 2500. G56 or Auto with 4. 10 it is 23,000 if 3500 and 20,000 if 2500.

 

[klenger]

It doesn't differentiate between G56 and NV5600.

AlexWV



I think that's the point of the post. Dodge seems to relate GCWR to rear axle ratio. With the low final drive ratio of the G56, Dodge does not offer it with the 4. 10 ratio, which is a penality for those who want a high GCWR with a manual trans. It would seem logical that the G56 with 3. 73 should have the same GCWR as the 48RE with 4. 10. The towing guide at the link you provided was written before the G56 was introduced.

 

[RustyJC]

It would seem logical that the G56 with 3. 73 should have the same GCWR as the 48RE with 4. 10.

Actually, not. The 4. 10 ratio reduces the torque applied to driveline components for a given rate of acceleration, speed, grade, etc. It's a question of mechanical advantage. Although the overall gear ratio (6th gear ratio x final drive ratio) might be about the same in comparing the NV5600-4. 10 and G56-3. 73 drivetrains, the G56-3. 73 driveshaft is turning more slowly due to the lower (higher numerically) 6th gear and thus having to transmit more torque than the NV5600-4. 10 driveshaft operating under the same conditions. Since BHP = (torque x rpm)/5252, to transmit the same BHP, the torque must increase as RPM decreases - the condition the driveshaft faces with the 3. 73 gearset.



Having said the above, I suspect that the running mid-year change to the G56 and the lack of availability of the 4. 10 will not be the subject of an update in the Dodge towing guide. It will be interesting to see what Dodge does with the GCWR for this combination in the 2006 towing guide.



Rusty

 

[REndres]

Based on AlexWV weight



weighed truck w/full fuel 7060

minus fuel 245

base curb weight 6815



Base curb weight for same truck from chart which I would assume NV5600 equiped is 7073. Is it safe to assume A G56 truck is about 250lbs lighter considering aluminum case vs iron.

 

[klenger]

Rusty: Your comments make sense assuming that the drive shaft was the limiting factor, but if the limiting factor is anything forward of the transmission input shaft, then the G56 with 3. 73's should have the same rating as a 4. 10 equpped truck.



Still interested in seeing where Tim got his info on the 23K limit. Was this published or an assumption base on previous posted ratings pre G56?

 

[RJOL]

... Was this published or an assumption base on previous posted ratings pre G56?

Good question Ken... I haven't found any source that gives the tow ratings for the new G56 with the 3:73's. If someone else has... I'd like to see it...

 

[Tim]

Still interested in seeing where Tim got his info on the 23K limit. Was this published or an assumption base on previous posted ratings pre G56?

That's what Tomeygun told me when I ordered and when I picked up my truck. I never checked it for sure for several reasons, one is that GCWR is worthless with an SRW truck because you'll overload the GVWR first, and the other is that I only pull about 9,000 lbs with 1,000 lbs of tongue weight so it's a non issue.

 

[klenger]

... GCWR is worthless with an SRW truck because you'll overload the GVWR first.

Agreed. I was just looking for some kind of published info on this, as are other members.



It would really suck if the G56 ends up with a lower GCWR than the 48RE as most of us gear jammers believe that the manual transmission is almost always a better option for towing. YOMV.