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-   -   Gearing for towing (http://www.fordtruckfanatics.com/forum/showthread.php?t=37464)

den842000 08-11-2014 11:01 PM

Gearing for towing
 
I have 92 F150 with 5.8W EFI 8.8 axle automatic tranny with OD and 3.08 gears. I am towing an 18ft boat, boat and trailer is roughly 3500 lbs. I am having a very hard time at highway speeds. I live in central KS and simply going up a gradual hill will take me from 70 to 60 depending of the grade. I should also mention I have gone from stock 75R15 to 30" tires. I have been told going to shorter hears would help, but I am not familiar with how far I should take the re-gearing. 3.55, 3.73, 4.20? I really need some recommendations and would appreciate any input. I would like to comfortably run 75 mph at highway speeds and really only use the truck to tow. I have had my mechanic check tranny and engine. Both are good and strong.

amkatt1 08-11-2014 11:14 PM

3.73's would be the nicest ratio for performance (and towing) and gas mileage IMHO

SuperCab 08-12-2014 07:10 AM

3.73 or 4.10

wizzard351 08-12-2014 08:37 AM

4:10s are alot of fun too, faster take off from a stopsign. ive got 2 trucks with 4:10's and 33' tires and one with 3:55's with 30' tires the 4:10's will out pull hands down

O'Rattlecan 08-12-2014 10:51 AM

With a slightly oversized tire, a 4.10 will actually take you closer to what a 3.73 would feel like on stock tires. 3.73 would be a good all-around gear too. You can't go wrong with both of those. To accomplish that much weight, 3.55 might not be the strongest choice.

Ryan

den842000 08-12-2014 10:56 AM

How well do you do on the highway? I am worried about hitting 65 or 70 and having my rpm's singing like crazy. This truck will be used primarily on the highway traveling to local lakes. A few people have mentioned that 4.10's are just to low to expect much out of highway speeds without really taxing your engine. However none of these people have or have had a ford with 4.10's. I have a buddy that was happy with 3.55's, but he didn't pull anything with his truck.

O'Rattlecan 08-12-2014 11:38 AM

It's all about striking the right balance. If Ford made trucks with 4.10's off the lot, I'm not aware of them. They might exist, but they're super rare. Maybe 3.73's are the right balance for you? You will gain a lot of power with 3.73's.

I have 3.55's in my pickup with a 351w, and when towing it always did pretty well. With your tire being slightly oversized, the effective engine speed ratios end up being about the same if you did 3.73. If you had a stock tire, a 4.10 would probably be out of the question, but you don't, so it's a real option.

Ryan

fatherdoug 08-12-2014 01:38 PM

Quote:

Originally Posted by O'Rattlecan (Post 627837)
It's all about striking the right balance. If Ford made trucks with 4.10's off the lot, I'm not aware of them. They might exist, but they're super rare. Maybe 3.73's are the right balance for you? You will gain a lot of power with 3.73's.

I have 3.55's in my pickup with a 351w, and when towing it always did pretty well. With your tire being slightly oversized, the effective engine speed ratios end up being about the same if you did 3.73. If you had a stock tire, a 4.10 would probably be out of the question, but you don't, so it's a real option.

Ryan

They are actually quite common, Ryan. Usually installed on 3/4 ton and larger. My '74 250 had 4:10's and my '89 250 has 4:10's.

I do wish they put a lot more 3:73's in their trucks. The Aerostar AWD had 3:73 ratios and was a perfect balance between mileage, performance and towing.

DNFXDLI 08-12-2014 07:29 PM

Your best bet is to run your numbers in a calculator such as this:

http://www.csgnetwork.com/multirpmcalc.html

O'Rattlecan 08-12-2014 08:27 PM

Quote:

Originally Posted by fatherdoug (Post 627874)
They are actually quite common, Ryan. Usually installed on 3/4 ton and larger. My '74 250 had 4:10's and my '89 250 has 4:10's.

I do wish they put a lot more 3:73's in their trucks. The Aerostar AWD had 3:73 ratios and was a perfect balance between mileage, performance and towing.

That explains it. My experience is relegated almost entirely to F150's.

Ryan


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