ordering new truck: need gear ratio info

[pwr2tow]

Hi all,
Ordering new truck and need some gear ratio information.
RPM'S at this speed 65MPH and auto trans with 4:10 rear.
1. 3rd lockup

2. OD lockup

Wife says if ordering new truck it has to be automatic. She helps pay for the truck and when we go camping she backs the boat and trailer in the water for me and when we load the boat she backs the trailer in so all I have to do is drive the boat on the trailer. I need the 4:10's for towing 19,500lb's GCW.
I triple trail everything in my signature and with the current rig I have trouble pulling the weight plus my fuel mileage is at 7 MPG towing. Hopeing to increase feul mileage towing with 4:10 gears as the engine will be in the HP numbers better. Thanks for any and all information. Ron

------------------
1999, 3500, 6x6, slt, auto, 3. 54, Qd cab, ISB cummins, towing 2001 26RKSS Tahoe 5th wheel, 1999 120hp 1800 bayliner.

 

[Barry]

While I do not have an Automatic, my rpm is 60/2000 65/2125 70/2250. Your rpm will be slightly less as the final for the auto is . 69 vs . 75 for the bolt action. I have never had a truck that will pull like the one I have now... ... ...

------------------
2001 2500 QC, ETH/DEE,4:10s, LSD, EZ with elbow(26. 5PSI)Stage 1 injectors from Carl, Boost/Pyro Guages, 4" Turbo back, BD Brake,Mag-Hytec Cover, Kleen Wheels, Energy Release, 70 gal. fuel, 20K Reese. 31,000 Miles on 03/01/01(RV Dealer)

 

[pwr2tow]

Thanks Barry,
Thank you for your reply but come on guys there has to be someone out there with an auto and 4:10 gears.
Thanks again Barry,

Ron

------------------
1999, 3500, 6x6, slt, auto, 3. 54, Qd cab, ISB cummins, towing 2001 26RKSS Tahoe 5th wheel, 1999 120hp 1800 bayliner.

 

[NDRamrod]

Ron,
I read before that there is a 300 rpm jump. Like I think 70 is 1800 rpm with your and mine. 4. 10s at 70 is 2100. Or so I think. ??

------------------
2001 bright white qc, sb, 4x4,auto,3. 54s, slt laramie, camper group,trailer group,6spkr infinity cd, travel convenience package, cloth seats in agate, stainless running boards (Wifes orders), stainless wheel opening trim, stianless steel tube box rails, and soft roll access cover(toneau cover), 5th wheel hitch( stock trailer-flatbed , K&N Air filter, 265/16s on factory aluminum wheels.

 

[Shovelhead]

I've got the same truck, only 2wd, stone stock w/ 8500 miles. 65mph=approx. 2100rpm.
Lock-up mph depends on how far your foot is to the floor.

------------------
Ed Anderson
99 3500,QC,Auto,4. 10,Everthing 'cept leather,stock until warranty runs out.
'76 H-D FLH, '98 FLHTCUI

 

[SOLER]

Ron
I had a Y2K with auto and 3. 54 rear. I towed a 12K 5er and 2. 5K boat/trailer. Figuring the truck weighed in at around 7000 loaded, that's 21. 5K! I got 9-10 mpg at around 60 mph. RPMs were 1500 @ 55 mph. 17-1800 at 60, and 2000-2100 @ 65. RPMs were around 2000 in 3rd between 55 and 60 mph. IMHO I wouldn't tow the double trailers more than 60-65, even tho the truck will definetely do it.

------------------
Shane Oler
'01 2500 4X4, ETH/6 speed, ISSPRO Pyro (pre-turbo)and Boost Pillar mount, Dark Garnet/Camel, 4" exhaust, Grill gaurd and nerf bars, 20K Reese 5er hitch

Other: '70 Olds Vista Cruiser 455 (future resto project)
30' Sandpiper 5er Super Slide bunkhouse(about 10k lbs. )

 

[SandDemon]

Go to the Gear Vendors site. They have the Gear Ratios for the autos and manuals. Then you can calculate MPH based on RPM and decide where to be. I can send you my spreadsheet if you want. I use it to correct for my larger tires.

Jeff

------------------
2001. 5 ETH/DEE 2500 4x4 3. 54 lsd. 33' Weekend Warrior 5er and an army of toys to fill it!
'96 1500 360 3. 90 LSD 3" cat back no muffler! 110,000 and still eating chebbys for lunch!

 

[Guest00]

Do a search on 4:10's,which rear end, 4:10 vs 3:54 etc etc in all forums
you will find more than you ever wanted to know.

 

[pwr2tow]

Thanks guys for your time. I have done the search thing but wanted to be sure before I ordered. The reason I'am tradeing is the truck i have now (99 dodge cummins) will not pull the load efficently, 7 MPG terrible, the truck I had before this one (dodge 95, 360 gasser) would pull the load and got 9 MPG over the same terrain.

P. S. I might not be tradeing after all. The Pi$$ ant dealer in Grand Forks (CHRYSLER CENTER) voided my warrenty for suspecting different fuel injectors. I am working with DC to have my warrenty reinstated.

I was dealing with another dealer until they found the warrenty issue, and I had made a pretty sweet deal. Will just have to wait and see what happens, hope not too long because when the factory incentives are gone so is the sweet deal. Ron

------------------
1999, 3500, 6x6, slt, auto, 3. 54, Qd cab, ISB cummins, towing 2001 26RKSS Tahoe 5th wheel, 1999 120hp 1800 bayliner.

 

[Bent6]

I have a 98. 5 3500 with an auto and 4. 10 gears. RPMs are about 2200 @ 70mph and 2100 or so @ 65mph. I get 10-13mpg pulling a 11000# gooseneck @ 70mph and about 17mpg unloaded. Hope this helps!

------------------
Will Wilkerson
'98 3500 24v, auto, stock - for now!

'87 Buick Regal
Turbo V-6 1400hp
7. 70 @ 179MPH 1/4 mile

 

[pwr2tow]

Thanks guys for your posts,
This will probably be put on hold for awhile now that I'am trying to resolve my warrenty issue. I'am so pi$$ed at DC I'am considering Ford, don't flame me cause I'am a wreck and have not got any decent sleep thinking about this. Ron

------------------
1999, 3500, 6x6, slt, auto, 3. 54, Qd cab, ISB cummins, towing 2001 26RKSS Tahoe 5th wheel, 1999 120hp 1800 bayliner.