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SeirraRR

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SeirraRR Senior Enthusiast

SeirraRR

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Just read this in the new Truckin' mag I got in the mail today.

 

GM has been tinkering with the shift points of it's six-speed transmissions and thier AFM system to coaxa little moremileage out of Chevrolet Silverados and GMC Sierras. The EPA rating for the 5.3L V-8 equipped models is up from 14 city /20 highway to 15/21, while the Extra Fuel Economy models move from 15 city /21 highway to 15/22. This puts GM's at the top of the EPA ratings for fullsize trucks. Horsepower, payload and towing specs remain the same.

SeirraRR Senior Enthusiast

SeirraRR

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VMax2007, I think I read in another thread that you had put the corvette servo in your truck. If so how are you likeing it so far? I'm planning on putting one in mine before next spring, maybe sooner. :cheers:

VMax2007 Senior Enthusiast

VMax2007

Posted
Posted
VMax2007, I think I read in another thread that you had put the corvette servo in your truck. If so how are you likeing it so far? I'm planning on putting one in mine before next spring, maybe sooner. :cheers:

 

Jury is still out. Yes, I put it in last Saturday, but I already had a tune with the shift pressures cranked way up. The reason I wanted a Vette servo was to make the shifts more consistent. With the stock servo and the pressures cranked up, the shift firmness was a little inconsistent. Sometimes is would be fairly harsh from 1-2 under light/med throttle, other times it was perfect. After putting the Vette servo in, the shifts seem to be more consistent, but I removed the BB tuned TCM on Wed and shipped it back to Justin to get the shift pressure backed off a bit as it hit too hard 1-2 under med throttle. Light throttle and WOT 1-2 shifts were great. I am confident once Justins puts the pressures where they should be for a Vette servo, the shifts will be more consistent.

VMax2007 Senior Enthusiast

VMax2007

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :cheers:

dlstewart01 Senior Enthusiast

dlstewart01

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :cheers:

 

 

Yeah I know, you would think they would have figured it out by now????

P71_CrownVic Senior Enthusiast

P71_CrownVic

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :jester:

 

 

Clearly then, he bought the better truck. :cheers:

C. Charles Hahn Senior Enthusiast

C. Charles Hahn

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :chill:

 

 

Clearly then, he bought the better truck. :cheers:

 

 

:jester: I think the GMT900s are better in every way EXCEPT for the tuning and computer control systems.

tobias Senior Enthusiast

tobias

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :D

 

 

Clearly then, he bought the better truck. :cheers:

 

 

:jester: I think the GMT900s are better in every way EXCEPT for the tuning and computer control systems.

 

 

...and the paper thin sheet metal. :chill:

09Jimmy Enthusiast

09Jimmy

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :P

 

 

Clearly then, he bought the better truck. :jester:

 

 

:nono: I think the GMT900s are better in every way EXCEPT for the tuning and computer control systems.

 

 

...and the paper thin sheet metal. :D

 

 

Don't forget the aluminum foil bumpers. :P

txab Senior Enthusiast

txab

Posted
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :P

 

 

Clearly then, he bought the better truck. :jester:

 

 

:nono: I think the GMT900s are better in every way EXCEPT for the tuning and computer control systems.

 

 

...and the paper thin sheet metal. :D

 

 

Don't forget the aluminum foil bumpers. :P

 

 

 

Or the Ebony seat issue :P

 

http://www.gm-trucks.com/forums/index.php?...p;hl=ebony+seat

C. Charles Hahn Senior Enthusiast

C. Charles Hahn

Posted
Posted

I love how the GMT800 owners are envious :nono:

 

If you guys weren't so heavy-handed with your trucks, you'd have no issues with the sheet metal/bumpers. And as for the ebony seat issue, there's a very easy solution. Get leather. :jester:

SeirraRR Senior Enthusiast

SeirraRR

Posted
  • Author
Posted
Yeah, with my sub standard poor mans diablo hand held, I can adjust my line pressure up and down.

 

 

You couldn't if you had a GMT900. :P

 

 

Clearly then, he bought the better truck. :jester:

 

 

:nono: I think the GMT900s are better in every way EXCEPT for the tuning and computer control systems.

 

 

...and the paper thin sheet metal. :P

 

 

Don't forget the aluminum foil bumpers. :P

 

 

 

Or the Ebony seat issue :P

 

http://www.gm-trucks.com/forums/index.php?...p;hl=ebony+seat

 

 

After reading that thread I will have to go in and check with my dealer about my seats. :D

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