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Old 06-07-2016, 04:43 PM   #1
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Why does the spec sheet give a min and max for rear axle ratio?



I pulled this list from the vin number spec sheet and there is alot of detail which is great but in regards to the axle rear ratio I have 2 specs which are the 3.73 and 3.42. Which one could it be or am I not understanding this correctly ?


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Old 06-07-2016, 07:51 PM   #2
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If you have a GM there should be a sticker on the glovebox door with an axle code. Look that up.


2010 F250 5.4L 3.73
2011 Flagstaff 831FKBSS
Equal-i-zer 4pt 12K
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2011 Flagstaff 831FKBSS
2010 F250 4X4 5.4L 3.73 LS
EQUALIZER E4 1200/12000
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Old 06-07-2016, 07:51 PM   #3
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Ok, thanks


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Old 06-08-2016, 07:17 AM   #4
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Why does the spec sheet give a min and max for rear axle ratio?

Looks like I have a 3.42 . I read so many pros and cons online that I'm not sure what is best. Some say that lightweight like my 5000 lb trailer is ok with my v8 5.7L 3.42 and some say that the 3.73 or 4.10 is better and that the 3.42 will break down faster in hilly areas. Then you have those that say that 3.73 and 4.10 are bad on gas and on daily driving especially highway. Do you guys think I'm ok with 3.42 pulling about 5000 lbs ? Would you recommend hills?


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Old 06-08-2016, 07:24 AM   #5
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I find the 373 GR covers all my needs! Youroo!!
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Old 06-08-2016, 07:34 AM   #6
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Quote:
Originally Posted by mrpep View Post
Looks like I have a 3.42 . I read so many pros and cons online that I'm not sure what is best. Some say that lightweight like my 5000 lb trailer is ok with my v8 5.7L 3.42 and some say that the 3.73 or 4.10 is better and that the 3.42 will break down faster in hilly areas. Then you have those that say that 3.73 and 4.10 are bad on gas and on daily driving especially highway. Do you guys think I'm ok with 3.42 pulling about 5000 lbs ? Would you recommend hills?


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It would help a lot to know......
make, model, year, engine

Here is the rear axle rpo codes (found in glove box) if its a gm vehicle
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Old 06-08-2016, 07:39 AM   #7
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It's a 2001 Chevy express 1500 v8 5.7 L


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Old 06-08-2016, 07:43 AM   #8
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Yeah 3.42 gears with that engine in a big ol vehicle like that, and towing a trailer that heavy....hills wont be fun and your tranny is at its limit without a trailer. Thats a heavy vehicle unless its a strip down work van.
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Old 06-08-2016, 07:44 AM   #9
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It's a conversion so it has some weight to it . I have a 11000 lbs capacity so if trailer is 5000 I have room for 6000 . Not sure what my van weighs though .


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Old 06-08-2016, 07:52 AM   #10
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Ok.
I've worked at gm dealers for years. The 4L60e is a good tranny, but your pushing the limits with the van. And being almost 16 years old doesnt help.
Im just offering advise. You might be fine, but i see a new tranny in you future if you tow that setup much.
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