GM Military CUCV Gearing for my K2500 ? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 12-08-2009, 11:00 PM Thread Starter
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GM Military CUCV Gearing for my K2500 ?

Ok i was looking at the CUCV's the Pickup truck's rescue squads possibly the Blazer's ?

All seem to have a 6.2L diesel, 3spd auto trans, 4.56 gears, 7.50-16 & 235/85R16 32" tires.

The surplus dealers have been swapping out the 6.2-NA/3spd auto for a 6.5-NA/4spd auto's with great success . . . say's they run 70/75mph just fine. . .

So then, I could go from 4.10's down to 4.56's in my truck and be just fine as i thought !

Just figured i would pass that along to you Ney Sayer's. . .

Mike

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post #2 of 7 (permalink) Old 12-09-2009, 01:43 PM
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depends on what your gonna do with it. for my use i prefer the 4.10 rato just about every time. part time pulling and no od, i like the 3.73 ratio. very little pulling and lot of highway[ no od], i like the 3.42. most military blazers come with the 3.08 ratio, and they do ok so long as your not pulling. i have another with a 3.73 ratio, and i really like it. if folks are going with the 4spd auto, i would stay with a 4.10 or 3.73 ratio, unless going to a taller tire. again, depends on what your doing with it.
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post #3 of 7 (permalink) Old 12-09-2009, 10:30 PM Thread Starter
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towing around 12 n 15K-LB load's crawling threw the Mud muck and what not, and more then likely i'll also be turning a set of 19.5 wheels n tires for long tread life better handling lower maintenance cost Remember I Mudder's so getting 60K miles for a set of Lugger's is way better then only getting 25-35K miles like the 16's do plus the 16's cost $200-$250 a tire v.s. 19.5 MT's n MTR's at $150-$175 a tire . . .

My truck get really Doggy towing 4,500-6,000LB's which is under half what i'd like to tow with it . . .

My 6.5-T seems to be a top end puller doesn't seem to be doing much till 2,400rpm, all my power seems to be from 2,500rpm to 3,500rpm, in the stock trim it runs [email protected],500rpm n [email protected],800rpm in OD, way to conservative for my liking.

I'd like to see max speed be more like 80-85mph, 65-75mph be like 2,700-2,900Rpm which yes seems high for a diesel but you gotta remeber the 6.5 is used in marine app's different externals same internals they run 2,800-3,200rpm's sustained continuous

EDIT:
Less speed more Grunt ! i don't drive fast so there for having my truck geared for high speeds (107mph) is wasted power IMO.

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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Last edited by M123KT-450; 12-09-2009 at 10:35 PM.
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post #4 of 7 (permalink) Old 12-10-2009, 01:24 PM
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be quiet with those pruposed weight you haul, this thread will get turned into something else by the weight police. very reason why i seldom mention my weight's. sounds like what you want, the 4.56's will do the trick. 6.2/6.5's do there best at lowend and topend, mid range is dead. the 4.88's in my f450 are a bit too low for what i want, the 4.63's in my 3500hd are just about perfect[ if it still had the 6.5 in it]. this one has a 5.9 repower, and the 4.63's make it noisy around 60mph in od. flip to double od, and at 70mph it's perfect!
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post #5 of 7 (permalink) Old 12-10-2009, 04:08 PM Thread Starter
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Well i work Rigs there truck's and truck is spelled = W O R K ! and that's how i run them . . .

Tho some use them for fun and drag race them or Mud bog them or do sled pulling, I work mine tho from time to time i have had fun with'm the main goal is work push pull tow haul.

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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post #6 of 7 (permalink) Old 12-13-2009, 01:12 PM
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agreed..
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post #7 of 7 (permalink) Old 12-15-2009, 12:23 AM Thread Starter
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I'm going to go with 4.56's and leave my truck on 16's i really wanted to go 19.5's but it's just not working as cost effectively as i would like it to. . .

So now that i know i can safely run 4.56's with the 16's then that is what i am going to do. . .

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

AMO #9860

B.O.M.B Squad #43

Dually Club #98
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