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8.1 And Allison Swap To Suburban

evcomp

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evcomp Enthusiast

evcomp

Posted
Posted

Hey all,

 

I was wondering if it would be possible to take the motor and tranny from an 03 Sierra and put into an older 95 3/4 ton k2500 Suburban? Theoretically as long as you used the control box/wiring harness all electronics would function, but was not sure about the fit. Already has the 454, so should be enough room.

 

Other thought would be to buy a new crate motor to get the same HP?

 

What is the going rate to install a motor at a shop now days, 1K, 1500?? Would like to be able to have this as a heavy duty tow vehicle and also would like the extra power. Old setup of throttle body had some limits that the fuel rail fixed. Any suggestions would be appreciated.

 

Thanks,

 

Bud

RonJ Enthusiast

RonJ

Posted
Posted
Hey all,

 

I was wondering if it would be possible to take the motor and tranny from an 03 Sierra and put into an older 95 3/4 ton k2500 Suburban? Theoretically as long as you used the control box/wiring harness all electronics would function, but was not sure about the fit. Already has the 454, so should be enough room.

 

Other thought would be to buy a new crate motor to get the same HP?

 

What is the going rate to install a motor at a shop now days, 1K, 1500?? Would like to be able to have this as a heavy duty tow vehicle and also would like the extra power. Old setup of throttle body had some limits that the fuel rail fixed. Any suggestions would be appreciated.

 

Thanks,

 

Bud

 

My guess is that the motor will fit...The Allison transmission won't...maybe with a major body lift.

Shaners Senior Enthusiast

Shaners

Posted
Posted

If you were to find an 8.1L with the 4L80E tranny from a wrecked 2500 Suburban or 2500 Avalanche with all the associated computers and wiring it would be a better fit. I don't the the Allison will fit.

evcomp Enthusiast

evcomp

Posted
  • Author
Posted
If you were to find an 8.1L with the 4L80E tranny from a wrecked 2500 Suburban or 2500 Avalanche with all the associated computers and wiring it would be a better fit. I don't the the Allison will fit.

 

I was thinking that maybe just the motor and the current 4L80E that is in the Sub would work, just not sure if the bolt pattern would match? I guess I may have to go the traditional route and use the current 454 and try and figure a way to squeeze out more power and torque. Nothing comes to mind, which is why I was thinking of a swap or getting a crate motor. Guess the other option would be gearing, but already has the 4.11. Any ideas? :thumbs:

grampadirt Senior Enthusiast

grampadirt

Posted
Posted

I have a '95 Burb with a 454 that I use to pull my toy hauler.After loading my dirtbikes,food,water,gear and other sh*t for the weekend it weighs 7,500-8,000lbs.The thing has a lift on it with 4:56 gears and pulls it pretty good.Last July I put a Comp Cams cam in which helped alot.There's another member here,Stumpuller454,who is gonna be putting on a supercharger on his 454,he might be able to help you if you wanna get a bunch more hp.You mentioned ''fuel rail'' what is this?

die hard Enthusiast

die hard

Posted
Posted
If you were to find an 8.1L with the 4L80E tranny from a wrecked 2500 Suburban or 2500 Avalanche with all the associated computers and wiring it would be a better fit. I don't the the Allison will fit.

 

I was thinking that maybe just the motor and the current 4L80E that is in the Sub would work, just not sure if the bolt pattern would match? I guess I may have to go the traditional route and use the current 454 and try and figure a way to squeeze out more power and torque. Nothing comes to mind, which is why I was thinking of a swap or getting a crate motor. Guess the other option would be gearing, but already has the 4.11. Any ideas? :sigh:

 

you have so many opitions with a 454 intake mainfold will help the flow rv / tow camshaft but make sure you go with a smoth idel shaft or will not idel right with the E.F.I. a computer chip will do a lot also .. a crate moter would be good but if you buy it from gm they will want your vin # to give you the same moter that came out of the truck for warenty reasons i would rip your down and rebuild it with all the goodies and port your heads out and do a some exhaust work that burban will come to life .the 4l80e trans is a good trans .and work with your fuel system that is important for these injected moters good luck
evcomp Enthusiast

evcomp

Posted
  • Author
Posted
I have a '95 Burb with a 454 that I use to pull my toy hauler.After loading my dirtbikes,food,water,gear and other sh*t for the weekend it weighs 7,500-8,000lbs.The thing has a lift on it with 4:56 gears and pulls it pretty good.Last July I put a Comp Cams cam in which helped alot.There's another member here,Stumpuller454,who is gonna be putting on a supercharger on his 454,he might be able to help you if you wanna get a bunch more hp.You mentioned ''fuel rail'' what is this?

 

 

Did you notice any increase with the taller gears? Mine came stock with 4.10 but have often thought about a re-gearing. Lift and tires might bring your 4.56 back down to the 4.10 ratio, not sure how the conversion works. I found a place that does full engine packages, only issue for me is that it is in SD. But still thinking about it. Here is the link to the place http://www.nordstromsauto.com . They were going to sell me an 8.1 with 4l80 tranny all programmed for $8950.

 

At this point I think it will be more cost effective to keep the current motor and rebuild. Oh and fuel rail was just my term for the fuel delivery system that has all the injectors per cylinder instead of throttle body. 96 was the first year.

grampadirt Senior Enthusiast

grampadirt

Posted
Posted
I have a '95 Burb with a 454 that I use to pull my toy hauler.After loading my dirtbikes,food,water,gear and other sh*t for the weekend it weighs 7,500-8,000lbs.The thing has a lift on it with 4:56 gears and pulls it pretty good.Last July I put a Comp Cams cam in which helped alot.There's another member here,Stumpuller454,who is gonna be putting on a supercharger on his 454,he might be able to help you if you wanna get a bunch more hp.You mentioned ''fuel rail'' what is this?

 

 

Did you notice any increase with the taller gears? Mine came stock with 4.10 but have often thought about a re-gearing. Lift and tires might bring your 4.56 back down to the 4.10 ratio, not sure how the conversion works. I found a place that does full engine packages, only issue for me is that it is in SD. But still thinking about it. Here is the link to the place http://www.nordstromsauto.com . They were going to sell me an 8.1 with 4l80 tranny all programmed for $8950.

 

At this point I think it will be more cost effective to keep the current motor and rebuild. Oh and fuel rail was just my term for the fuel delivery system that has all the injectors per cylinder instead of throttle body. 96 was the first year.

 

To be honest the gears were on it when I bought it so I have nothing to compare to.I've replaced the worn tires not long after I bought it.I put Goodyears on,don't remember the style..a kind of A/T I think(I should write it down so I know just what the hell I bought).With the 4:56s and the 33'' tires I think it's close to stock ratio.. on the f'way in Dr. the engine turns 3,ooo rpm,in OD 2,500rpm. Nine grand for an engine and tranny? You can do a hell of alot to your 454 for that kind of money...

evcomp Enthusiast

evcomp

Posted
  • Author
Posted
I have a '95 Burb with a 454 that I use to pull my toy hauler.After loading my dirtbikes,food,water,gear and other sh*t for the weekend it weighs 7,500-8,000lbs.The thing has a lift on it with 4:56 gears and pulls it pretty good.Last July I put a Comp Cams cam in which helped alot.There's another member here,Stumpuller454,who is gonna be putting on a supercharger on his 454,he might be able to help you if you wanna get a bunch more hp.You mentioned ''fuel rail'' what is this?

 

 

Did you notice any increase with the taller gears? Mine came stock with 4.10 but have often thought about a re-gearing. Lift and tires might bring your 4.56 back down to the 4.10 ratio, not sure how the conversion works. I found a place that does full engine packages, only issue for me is that it is in SD. But still thinking about it. Here is the link to the place http://www.nordstromsauto.com . They were going to sell me an 8.1 with 4l80 tranny all programmed for $8950.

 

At this point I think it will be more cost effective to keep the current motor and rebuild. Oh and fuel rail was just my term for the fuel delivery system that has all the injectors per cylinder instead of throttle body. 96 was the first year.

 

To be honest the gears were on it when I bought it so I have nothing to compare to.I've replaced the worn tires not long after I bought it.I put Goodyears on,don't remember the style..a kind of A/T I think(I should write it down so I know just what the hell I bought).With the 4:56s and the 33'' tires I think it's close to stock ratio.. on the f'way in Dr. the engine turns 3,ooo rpm,in OD 2,500rpm. Nine grand for an engine and tranny? You can do a hell of alot to your 454 for that kind of money...

 

 

I agree, decided that I will stick with the 454 and start the mod process. Thinking I may switch the gears to 4.56 since it is not that much $$. If keeping the 265/75 tires I have now, would still give me better torque. Will see I guess. Nothing like a good project, will keep posted when I do something major.

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