Time for a trans rebuild

[duramaxfreak101]

HI new here and to duramax's. I have a 2 part Question.

1 my dad has a 2005 chevy 2500 4x4 Duramax with the Allison. He has owned it since new and now has 150k on it. He uses it to pull HEAVY with it (trailers not sleds) . mods are egr delete, 4'' exhaust, efi live, cold air intake, 285/75/16 tires.

We live in northern Indiana who should we have rebuild the Transmission?

2 I bought a 2009 GMC 2500 4x4 except from the year the trucks are as close to being the same as it comes mods included, and I get better Fuel economy pulling the same trailers at faster speeds than him.

If he gets the 6th gear added when he gets it rebuilt can he expect to get better economy at higher speeds like I get in my truck?

Thanks In advanced, sorry for the long post but ive done lots of reading but have failed to answer the questions at hand.

 

[IOWA LLY]

Don't waste your money on the six speed conversion.

Not all trucks are created equal when it comes to mileage. There are so many factors involved. But generally speaking, unless your towing at a pretty high speed you will get the best mileage towing in 5th, even with a 6 speed. In my experience anyway.

 

[Awenta]

Don't waste your money on the six speed conversion.

Not all trucks are created equal when it comes to mileage. There are so many factors involved. But generally speaking, unless your towing at a pretty high speed you will get the best mileage towing in 5th, even with a 6 speed. In my experience anyway.

This. That 1500+ (or whatever it is now) buys ALOT of fuel.

Sent from my SM-N910V using Tapatalk

 

[duramaxfreak101]

We took a trip out west pulling campers and I got 12.6 mpg at 82 mph, he got 8.7 mpg.
lol he used a lot more fuel. I personally don't think its worth it but wanted to get some more opinions.

Other than the 6th speed is there any other difference that would make my 09 get better economy than his 05?

 

[OregonDMAX]

Is his an lly or lbz if it's the lly the stock mouthpiece is his major crutch

 

[Mike L.]

Don't waste your money on the six speed conversion.

Not all trucks are created equal when it comes to mileage. There are so many factors involved. But generally speaking, unless your towing at a pretty high speed you will get the best mileage towing in 5th, even with a 6 speed. In my experience anyway.

This. ^^^^^
Your LLY does not have the TQ to pull 6th gear; even with a big program. Total mismatch.

 

[superswamper003]

Is his an lly or lbz if it's the lly the stock mouthpiece is his major crutch

He says its an 05. So an lly, and yeah The stock mp sucks

 

[duramaxfreak101]

Ill see if i cant talk him out of the 6th speed.

Any advice on who to have rebuild it? I know the local transmission shops are not any good . we are willing to drive 4-5 hours if need be ? Thanks

 

[Pwinland95]

Drive to Danville and see mark. He will treat you well.

 

[kheims]

Danville, dans diesel performance, wehrli custom fab, Duramax tuner, merchant automotive DHD. Are a few that come to mind

Where in northern Indiana are u from

I'm from north west Indiana and I'm gonna get one from limitless performance in Massachusetts. Prolly have it sent to me and install myself.

 

[Mike L.]

Danville, dans diesel performance, wehrli custom fab, Duramax tuner, merchant automotive DHD. Are a few that come to mind

Where in northern Indiana are u from

I'm from north west Indiana and I'm gonna get one from limitless performance in Massachusetts. Prolly have it sent to me and install myself.

Smart move.