315's and 3.55 gears? - Page 2 - Ford Truck Enthusiasts Forums



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315's and 3.55 gears?

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  #16  
Old 08-20-2014, 02:24 PM
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Quote:
Originally Posted by nossliw View Post
hmmm. Looks like I'll be sticking to 12.50s :-) at least to get a 10ply
I've seen these on dual rear wheel trucks up my way.. The 35x12.5x16 has a mounted width of 9.5" TrXus MT | Interco Tire
Supposedly they go good on the road..
FYI I had a set of SSRs on my 97 cclb, they were pretty quiet, think I got around 30k out of them. I sold them with enough lug to get a sticker..
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Old 08-20-2014, 03:53 PM
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FWIW, I have 3.55 and currently have 265s on stock 16" rims and the odometer reads about 5% slow according to my phone GPS. For two weeks I was running 35s on 16.5" wheels. I noticed no difference between the two but did not GPS the 35s. The 35s measured an actual 33".

I'm not towing and have little plans to do so for now. I did put in a BTS valve body.

I think a lot of it depends on how you intend to use and drive the truck.
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Old 08-20-2014, 03:53 PM
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Double post...
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Old 08-20-2014, 04:08 PM
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Originally Posted by LeoJr View Post
FWIW, I have 3.55 and currently have 265s on stock 16" rims and the odometer reads about 5% slow according to my phone GPS. For two weeks I was running 35s on 16.5" wheels. I noticed no difference between the two but did not GPS the 35s. The 35s measured an actual 33".

I'm not towing and have little plans to do so for now. I did put in a BTS valve body.

I think a lot of it depends on how you intend to use and drive the truck.
I agree w you Leo, for a daily driver, no towing, with frequent highway driving 35s are actually nice w 3.55s.. You can run 80 +/- and still keep the revs at 2k or under... Boy do they suck to tow with tho...
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Old 08-20-2014, 05:01 PM
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I wonder what the cost of a gear vendor under drive costs versus re gearing both ends...my research project for the night....

Edited to add: about three grand. Never mind.
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  #21  
Old 09-11-2014, 02:07 AM
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I ran 305/70R16s with 3.55s and an auto. I was able to pull around a 25ft boat without any issues & 4x4 also without any issues. I know you asked about 315s but the info might help give some idea as to what to expect.
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  #22  
Old 09-11-2014, 08:00 AM
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I recently ran 37s for a few weeks. They speedometer read about 15% slow according to the phone gps. With the 3.55 gears it really wan't too bad but having an auto trans is what really makes it usable. I habitually turned off the OD unless I was on the highway. I suspect the truck would have acted better if I reprogramed the PSOM (speedometer) but I'll do that when I've committed to a tire size.

Unless you are driving at speeds the torque converter is locked (45 mph and up?) you put more heat into the transmission. I used my aeroforce gauge and noticed it ran about 10 degrees hotter. A trans cooler would be an absolute must if you were towing or heavily loaded. I have a trans cooler I will be mounting in the future.
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Old 09-11-2014, 08:21 AM
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I use to always turn off my OD when I started the truck; I'd engage it manually otherwise it shifted in to soon for the 35/3.55 combo and my liking.
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