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Thread: Highway RPM with G56 and 3.73 Reply to Thread
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  Topic Review (Newest First)
09-12-2019 11:09 AM
akhr You guys are correct about the 2w low but I have a one of those 2wd trucks that almost don’t exist lol. It’s a tow rig and I got a killer deal on it. Couldn’t be to picky
09-12-2019 08:07 AM
the man in black Even with 3.73s backing up with a heavy trailer is rough. Still to fast to back into a tight spot. 2lo is really to only answer for that. I dont know why we need to be able to go 20 mph backwards
09-12-2019 01:40 AM
ploobr
Quote:
Originally Posted by akhr View Post
Same here, I pretty much only use the truck for towing 26k-30k lbs on average and would love to have 3.73 vs my 3.42, plus backing up would be bearable with 3.73. The reverse gear is almost as tall as 2nd, I would like to know what idiot decided the reverse gear need to be that tall?
BD 2-Low kit is the way to go.
09-12-2019 12:20 AM
akhr
Quote:
Originally Posted by the man in black View Post
70 for me with a g56 is around 1900 I think. If you really want to know speeds for a given rpm I'll make a note next time I drive the truck. If I could find someone with a srw 3.73 truck I'd swap everything in a heartbeat. Towing heavy with 3.73s is so much more enjoyable imo.
Same here, I pretty much only use the truck for towing 26k-30k lbs on average and would love to have 3.73 vs my 3.42, plus backing up would be bearable with 3.73. The reverse gear is almost as tall as 2nd, I would like to know what idiot decided the reverse gear need to be that tall?
09-11-2019 07:47 PM
the man in black 70 for me with a g56 is around 1900 I think. If you really want to know speeds for a given rpm I'll make a note next time I drive the truck. If I could find someone with a srw 3.73 truck I'd swap everything in a heartbeat. Towing heavy with 3.73s is so much more enjoyable imo.
09-11-2019 07:42 PM
lauber_03 Put info in here

Gear Ratio Comparison Tool - Compare Axle, Transmission Combinations
09-11-2019 01:57 PM
gixxer998 That’s exactly what I’m looking for. Mainly highway miles not pulling a lot. What rpm could I expect with the 3.42’s? Thanks

Quote:
Originally Posted by the man in black View Post
Yup completely normal with a g56 and 3.73s. If all you seldom do any towing or at least not heavy, 3.42s are great highway gears.
09-11-2019 01:32 PM
the man in black Yup completely normal with a g56 and 3.73s. If all you seldom do any towing or at least not heavy, 3.42s are great highway gears.
09-11-2019 12:15 PM
gremlindude g56 has a over drive ratio of .74 and a 68 and asin has a .63 i have a g56 with stock tires and 3.73 rear running same rpm as you.
09-11-2019 10:33 AM
lauber_03 2012 g56 with 4.10's and 35's i run 2000 rpms at 67mph
09-11-2019 09:19 AM
gixxer998
Highway RPM with G56 and 3.73

Hey everyone. Been searching and lurking for a while now. I’ve got a ‘16 3500 dually with 295/55/20’s and I’m running around 2-2100 rpms at 70 mph. This seems a little high as I have buddies running around 1700 rpms.

Does this seem right? Is an auto trans ratios different from the G56?

What RPM’s are you guys running and is it worth changing to a 3.42?

Thanks

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