355 gears

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Jul 15, 2004 | 09:14 PM

shendoa

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From: northern Maine

355 gears

when i am going from Maine to fl. i weigh about 21,200 lb. 355 gears kind of high, manual tranney, I can run 65 in 4 gear at 2400 rpm, will it hurt anything if i drive 1500 miles in 4 gear and never put it in 5? 5 rpm 65 is only 17 to 1800 rpm. I know i need lower gears, but when not towing i get great fuel milage 28 to 30 mpg. not to good when towing in 4 though.12 / 14 but i am very heavy. camp trailor is filled with junk and harley flstc. wife pourch swing welder tourches all tools = etc etc oh yes that was before when i was stock. now i have no idea on the mpg.

Jul 15, 2004 | 09:21 PM

Kwikkordead

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From: Rio Rico, AZ.

I don't see where it would hurt, but I would recommend changing out your transmission, transfer case, and rear diff with synthetic oil to better withstand the heat generated. Royal Purple, Redline are two brands that come to mind at the moment.
Personally I use Redline D4 ATF in my six speed and transfer case. Redline Shockproof in the rear axle. Good stuff.

Jul 15, 2004 | 09:27 PM

shendoa

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From: northern Maine

I was told by you to use royal purple a few days ago, so i ordered it for rear. now my tranney is manual and i think i might get rp maxatf not sure yet, transfer case i don't use on trips never in 4/4 so might leave that alone. appreciate the advice.

Jul 16, 2004 | 06:42 AM

marspec

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I have a 95 PSD with auto and 3.55s. When towing I never use OD (the tranny hunts too much) and run between 2300 and 2500 RPM. Never had a problem.

Jul 16, 2004 | 09:22 PM

wls

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From: Mid-Mich

Quote:

Originally Posted by marspec

I have a 95 PSD with auto and 3.55s. When towing I never use OD (the tranny hunts too much) and run between 2300 and 2500 RPM. Never had a problem.

When not towing what kind of mpg's are you getting. What are your rpm's at 70 mph? thanks

Jul 16, 2004 | 09:47 PM

marspec

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Quote:

Originally Posted by wls

When not towing what kind of mpg's are you getting. What are your rpm's at 70 mph? thanks

Running at 70mph rpm is around 1800-1900. Kinda hard to interpret tach that close. Straight highway driving get 23-25mpg depending on terrain. 75% highway, 25% city around 20-21. All city 18-20. Towing 11,500# 5th wheel 9-10.