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post #1 of 29 Old 02-18-2008, 11:18 AM Thread Starter
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will I have to regear

I am about to buy my lift kit but I am stuck, if I go 6" and run 37's will I need to regear? Will it tear my tranny out.? Will I need to extend my driveshafts? Or will it be just install and go?



03 F250 4wd auto strait pipe quad cab lariat 33x12.50x18

84 K5 blazer CUCV M1008 dana 70 front and rear, detroit lockers front and rear, 45" tractor tires, 6.2 diesel

1978 cj5 built 304 lots and lots of rust
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post #2 of 29 Old 02-18-2008, 11:23 AM
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As long as you dont pull heavy loads much then you can just install and go.

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post #3 of 29 Old 02-18-2008, 11:23 AM
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Your driveshafts will be fine at 6 inches just a carrier bearing spacer to get the rear drive shaft at the right angle and as far as gears thats pretty much up to you I'd drive it and see what you think but if you did I'd probably say with 37's and a daliy driver 4.11 to 4.30's the 4.56's would be to low

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post #4 of 29 Old 02-18-2008, 11:26 AM
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you wont "need" to regear... you will have to correct your speedo.... with stock gears you will be adding more stress on stock components like your trans... your speedo will also be off which your shift points will also be off.... you dont have to regear but i highly recommend it.... i would go 4.30's oh and also you city driving MPG will decrease because you ahve more rotating mass which takes more HP to get you started with stock gears... i would also upgrade your stock brakes to powerslot cryo rotors on LTS pads and SS braided lines....
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post #5 of 29 Old 02-18-2008, 11:29 AM
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Been running a 4" with 37's for 140k... no issues. Wifes X has a 6" and 37's and 120k and no issues.

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #6 of 29 Old 02-18-2008, 11:47 AM
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i have a 6'' with 37's also, no issues here.

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post #7 of 29 Old 02-18-2008, 12:05 PM
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Its not about having issues but rather low end power. My 3.73's with 37's was like draggin an anchor of the line. Now it feels better than stock IMO.

1970 F250 Crew Cab rebuilt/restored w/Cummin s 4bt

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post #8 of 29 Old 02-18-2008, 12:16 PM
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Quote:
Originally Posted by dlonno View Post
Its not about having issues but rather low end power. My 3.73's with 37's was like draggin an anchor of the line. Now it feels better than stock IMO.

Never had an issue pulling with mine, 3.73 and 37's... All over the country, from 8k to 20k... Get better milage too...

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #9 of 29 Old 02-18-2008, 12:25 PM
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I think the mileage is a toss up. If you drive highway, yeah, 3.73's will get better mileage. But if youre in town a lot, you waste a lot of gas being in basically the wrong gear. I've changed the gears in every truck I've lifted and rolled bigger tires on. But like I said,
IMO

1970 F250 Crew Cab rebuilt/restored w/Cummin s 4bt

8v, M5R2 Tranny, VE pump, DennyT stage 2 pin, M&H Dynamic Timing, 3200k gov spring, Hx30/Hx35 Twins, 40hp styx, smoke screw screwed, star wheel cranked, Hydroboosted
91 Gillig Phantom, Converted transit bus, 6v92 Detroit Diesel

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post #10 of 29 Old 02-18-2008, 12:26 PM
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Here is the way I look at it, if you regear and pay someone to do it, its going to cost you about 1200 out the door... Thats ALOT of fuel! But like you said IMHO...

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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