Gears?

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skbishop90

skbishop90

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Ive had the 4:10s installed now for about 4 months. I dont drive it on the interstate so thats not an issue but around town I noticed that I get BETTER mileage. I get about 18-19mpg. Granted where I live it mostly hills and 40-50mph. With the gears, and servo, It drives so much better. I just wish the cheap gears werent so LOUD at times. Around 45mph, it is sort of annoying unless I turn the radio up or get into the throttle and drown it out.
 

ccapehartusarmyINF.(ret)

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sorry man im not saying yer full of shit or anything but id have to see that to believe it
because ive previously owned a vehicle with 4.10s front and back and it didnt matter if it was highway city offroad underwater you name it the fuel economy i got wasnt 16-22 mpg
it was shittier-****** MPG
 
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skbishop90

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Take a trip down and Ill show you my math on fill ups.
 

Marv02

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If the gears were set up right they should be Quiet take it back who installed them.
I have ran different gears over the years the only more noisy ones were Richmans because they are a harder metal but by more noise there were very little noise.

Ive had the 4:10s installed now for about 4 months. I dont drive it on the interstate so thats not an issue but around town I noticed that I get BETTER mileage. I get about 18-19mpg. Granted where I live it mostly hills and 40-50mph. With the gears, and servo, It drives so much better. I just wish the cheap gears werent so LOUD at times. Around 45mph, it is sort of annoying unless I turn the radio up or get into the throttle and drown it out.


---------- Post added at 09:30 AM ---------- Previous post was at 09:20 AM ----------

I have Factory 4:10 in my 2001 Yukon XL 4X4 I get on a good Day 15.3 to 15.7 MPG.

I running 265/75/16 AT tires these tires are 1 inch taller than stock.
With the Stock 265/70/16 I was getting about the same MPG.
I also running a Hypertech programmer to adjust for the tire size not so much for the performance I do have set on Performance and 50% firmer shifting.
What I can tell the Performance mode more of less reprograms the timing curve and the injector timing nothing to write home about.

But I also have a Series 70 big block Flow master muffler I have noticed it dose not down shift as much climbing hills staying up on HWY speeds get up to speed easier but It not no race car by far.
 

bottomline2000

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If the gears were set up right they should be Quiet take it back who installed them.
I have ran different gears over the years the only more noisy ones were Richmans because they are a harder metal but by more noise there were very little noise.



---------- Post added at 09:30 AM ---------- Previous post was at 09:20 AM ----------

I have Factory 4:10 in my 2001 Yukon XL 4X4 I get on a good Day 15.3 to 15.7 MPG.

I running 265/75/16 AT tires these tires are 1 inch taller than stock.
With the Stock 265/70/16 I was getting about the same MPG.
I also running a Hypertech programmer to adjust for the tire size not so much for the performance I do have set on Performance and 50% firmer shifting.
What I can tell the Performance mode more of less reprograms the timing curve and the injector timing nothing to write home about.

But I also have a Series 70 big block Flow master muffler I have noticed it dose not down shift as much climbing hills staying up on HWY speeds get up to speed easier but It not no race car by far.






OP has a few advantages over you being lowered, a full exhaust system, 2wd (assuming) and factory efans.. all can add to better fuel mileage.. also if he has a custom tune vs a can tune like hypertech it could make a world of difference. once I finish with mine it will be a similar setup only with bigger displacement and cammed. I would be extremely happy to see high teens for city mileage..
 

ccapehartusarmyINF.(ret)

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id almost be willing to organize some sort of bet
im sorry but i just cant fathom 4-5 mpg fuel economy increases especially after alot of serious mods 2-3 ehh maybe with brand new shocks new brakes new tires properly inflated new bearings fresh oil change with premium full synthetic royal or amsoil etc detailed engine block etc
 
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skbishop90

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I was getting close to that mileage before the gears. I averaged around 16-17mpg. I have a custom dyno tune and off road Y.
 

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