1sttruck

Doesn't GM defuel the Allison in 1st (5th too ?) in order to handle the recent horsepower upgrades ? The Duramx is a newer design, but Isuzu and GM both quickly upgrade to a larger inline 6 instead of using the 8 cyl up to grade 8, like Cummins and Ford do.

Lil Dog

Good point too.. Yes they defuel the Dmax in 1st and 5th with anything over 520 ft-lbs. You can get your 600 ft-lbs, just not in 1st or 5th. Smart.. Especially since you CAN'T SELECT 4th on the selector... Brilliant..

fountain1fan

bkrukow you doint kmow munch about chey. there ifs with alum diff housing and cv joints are verry week . not to even talk about ther small rear ends. i have a truck with ifs and they suck offroad . it is getting a solid axel converson soon

Barry Smith

fountain1fan, I hate to be the one to break this to you but the chevy uses the exact same rear end the new dodges do.

I do have to point out that the NV4500 is the same trans used in Chevys of that time and they never broke???? not enough power!!!(I had to come up with something these chevy guys at work are killing me while I'm replacing 2,3,4 and cluster gears!)

Lil Dog

Uh.... Its Ford that uses American Axle, the new Dodges use AA.. Chevy uses...well Chevy axles..

And Chevy has not used New Venture transmissions at least to my knowledge... Getrag yes, but not NV. Ford and Chevy use the same 6 speed (I don't know the manufacturer off hand). Different shift pattern.

Please correct me if I am wrong here.

nickleinonen

FoMoCo uses their own rear axles [sterling?] and dana up front. GM uses AAM axles on their HD trucks [they have the same 11.5" dodge has, but in a slightly different housing.] gm has used NV in the past and still does. their lighter trucks have the nv3500 5 speeds like come in many dodge trucks with manuals, but chevy uses the ZF6 for the HD, and that is the same as ford uses. and i believe gm and dodge have the same [or similar] transfercases for the 4x4 [nvg?]

RAMV

You are wrong, let me correct you:


Chevy has always used AAM axles, however they used to have large shares of AAM and it has now become its own venture.

The front IFS ('89+) is a 9.25" AAM, same center section as the '03+ Dodge 2500/3500 solid axle.

Rear axles...... The AAM 1050 found in Dodges is based off the 14 bolt axle Chevy has used since '73 only made cheaper. (no removable pinion support etc) The AAM 1150 was developed for the '01 Dmax truck and also showed up in '01 8.1 L trucks as well '03+ 3500 Dodges and 2500 w/ manuals. I believe all 48re trucks also got it.

Ford used Dana 50 front axles '99-'2001 and then dana 60 front axles (with 35 spline inners) for '05 they have 35 spline outers too.

Rear:
SRW Ford gets Visteon 10.5 (mfg in Sterling Plant) same as the old 10.25" just upgraded.

DRW uses Dana 80.

Trannys -- Chevy used Getrag 5 spd in 1/2 tons '88 up.

All 2500HD/3500s got NV4500 (with a 6.34:1 gear until '94 when they went to the 5.61 first found in the Dodge)

Gm used this until '01 when a new tranny (ie stronger) was required for 8.1/dmax trucks. GM went with the ZF-6 (found behind PSDs and V10s in the Fords) over the NV5600 as it was lighter.

6.0l Chevys still get the NV4500, btw.

T-cases

'00+ 2500, 2500HD and 3500 get the NV 261/263
4500/5500 get the NV273
'99+ PSD and '03+ Dodge get the NV 271/273

RAMV

Thats not entirely true, but yes it does defuel in first and fifth if it dtects slipping, most chips utilize this fature to help out.

'03+ Allisons allow you to select all gears individually. The tow haul botton has two separate clicks.

'01 and '02 you couldn't select drive but they changed it.

Lil Dog

Thanks you gents.. I am now more informed..

I had read somewhere when the 3rd gens came out they were using the same front axle and rear axle vendor as Ford. Sorry bout that...

Thanks for the info.. Sorry for the mislead..

RAMV

No worries

bkrukow

Thats what I thought but was not 100% certain so I just kept my mouth shut.

fountain1fan

the ford uses zf 5 and 6 speeds, i know becous i'v WELDED the bell hopousing back togather maney times . as for the chey it might have the 9.25 ring gear BUT, IT HAS A ALUM DIFF HOUSING. week as hell .

fountain1fan

the dodge uses nv 5600 6 speed

Lil Dog

Maybe I should try that....

J-

FastZilla

If I remember correctly from my 4 wheelin days the Dodge version of the NV4500 had a larger stronger input & output shaft.

Memory may be fading though.

Kind of like the T56 in the Cobra (425 ft/lb) and the Viper (550 ft/lb) ratings in the same case - just different input/output shafts, stronger guts too.