Rear end ratios with 35s

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Rear end ratios with 35s

Postby Justgosurfin » Mon Jun 11, 2018 9:01 am

Kill me if I overlooked an axle section... just trying to figure out the right way to go.

Is anyone running 35s? What are you 60, 70, 75 mph engine speeds?
In a ford van: 1997 nv4500, 2007 nv271, 1990 12v with newer intercooler and stock h1c. VE turned up a bit by PO I assume since I can hit 22-23 psi. I have a he351cw to install sometime and plan to do the usual VE mods and maybe injectors down the line. Not going for madness just usable somewhat efficient power.

Current 3.54 with 265/75/16
60, 1691
70, 1973
75, 2114

3.73 with 35s
60, 1611
70, 1880
75, 2014

4.10 with 35s
60, 1771
70, 2066
75, 2214

I don’t need to go 75 but definitely 72-73 to keep up with Florida traffic. Would the drop using 3.73 hurt me through 2,3,4 too much? Or lug too much on secondary roads?

I don’t tow much but when I do it’s my boat with trailer at about 5500-6k lbs. mostly around town and highway but we’ll be doing road trips (without towing for now) out west to find trails and use the lockers I put in. Obviously this is a full size van not a rock crawler but we’ll have fun. I feel with first being so low and add tcase low to that I shouldn’t be too worried about loosing low speed low end with the 3.73 just want to make sure it’s not a dog in 2nd and third. ...gear choices are for a sterling 10.5 and Dana 60 in front.

Thanks for any opinions just trying not to do this twice.
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Re: Rear end ratios with 35s

Postby Donkey Kong » Tue Jun 12, 2018 3:31 pm

Im running 35s. NV4500 / NP205 and 3.54. Im just under 1800 at 70mph
93 Club Cab W250 NV4500
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Re: Rear end ratios with 35s

Postby Remps » Tue Jun 12, 2018 10:17 pm

If you do a lot of driving/towing at 70-75 3:73's would be nicer to have, and won't feel doggy in the lower gears. A long trip at 70-80 mph would have you wishing for taller gears. Towing at 55-65 on hilly twisty roads may have you downshifting more vs 4:10's. Either should go wheeling fine with that t-case.
'90 D250 R/C,727,IC,6x.009's,1/8" bump,fuel psi,straight pipe w/5" stack.
'90 W250 R/C,47rh,K@N,HX35,1/8" bump,2nd gen IC,boost,egt,trans temp.3.07's.
'96 2500 S/C L/B,2wd,NV5600,3.54 L/S,cai,egt,pacbrake,mbrp exhaust,10 plate.
Bring back the Bank of Canada, PRE- 1974.
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Re: Rear end ratios with 35s

Postby Justgosurfin » Thu Jun 14, 2018 6:13 am

Thanks guys. 3.73 seems to be a good general consensus.

Donkey Kong, how’s your highway mpg with that setup?
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Re: Rear end ratios with 35s

Postby Donkey Kong » Fri Jun 15, 2018 10:20 am

About 20, not bad not amazing. Im sure I could get better mpg just by keeping my foot out of it
93 Club Cab W250 NV4500
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Re: Rear end ratios with 35s

Postby Justgosurfin » Wed Jun 27, 2018 10:41 am

Yea I hear that, I just did my first round of pump mods and now I just gotta floor it everywhere for a week to get it out of my system.
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