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GMFS Uber-Member
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Discussion Starter #1
All right, I couldn't find any answers to this, and the Engine & Performance thread seemed best because the trannies are part of the drivetrain.

Here goes: what would be a better setup if trying to build up some decent horsepower from the engine. BTW, I think my tranny is goin out anyway.
Built 4L80/85E and Gear Vendors Overdrive, or GMPP 6L90E. Also, what would be easier to put, I know the 80E will bolt right up, it's what I've got now, but would the 85E and the 6L90E need a lot of work?

Thanks
 

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We don't know about the 6l90 yet and honestly I've never heard of a 4l85e(4l80e with 5 pinion planetary?).

Why would you need anything more than a built 4l80e? The fastest silverado in the world is running one and he hasn't had a bit of trouble from it.
 

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HOT AIR BALLOON OWNER
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90E is just a beefed up 6L80E as far as I'm concerned. We have no data yet as stated... The 80E with a built valve body, cooler, etc. Should hold more than your motor is good for. It's a tank.

85E's came in Suburbans and Avalanche. As far as trying to seek one out, spend your time elsewhere.
 

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Discussion Starter #4
Thanks guys, sounds like a good bet then to go for the 4L80E...

I had planned on doing an LSX based build up when I get some time and cash but it's looking more like any engine I build will end up in a project and I'll get a new Duramax. Who nows.

Thanks again
 

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HOT AIR BALLOON OWNER
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So if the truck isn't laying out 500rwhp, why do you need to swap the trans to the 80E? The guts to go through a 60E to make it fairly beef are only around $450-500 for parts.
 

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Discussion Starter #6
So if the truck isn't laying out 500rwhp, why do you need to swap the trans to the 80E? The guts to go through a 60E to make it fairly beef are only around $450-500 for parts.
It's a 2500HD...already has the 80E; just to clarify...That was the reason for the 80/85/90E. Only threw the 85 in there 'cus Bowler Performance has a built 80E that'll handle 1000ft/lbs and the 85E handles 1200ft/lbs. Doubt I'd put that out, but insurance is always good right?

Thanks again for the advice.:cheers:
 

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HOT AIR BALLOON OWNER
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It's a 2500HD...already has the 80E; just to clarify...That was the reason for the 80/85/90E. Only threw the 85 in there 'cus Bowler Performance has a built 80E that'll handle 1000ft/lbs and the 85E handles 1200ft/lbs. Doubt I'd put that out, but insurance is always good right?

Thanks again for the advice.:cheers:
yes, insurance is good...but not that much is necessary, a stock 4l80e with just a shift kit should be good for around 700rwhp and with a vaccum modular it will shift pretty close to stock if its a DD. a built unit your talking about is going to shift very hard...
 

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HOT AIR BALLOON OWNER
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a built unit your talking about is going to shift very hard...


Hard shifts = incorrectly built, valve body, clutch clearance, etc. It should shift firm with new clutches and no internal slop.
 

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Hard shifts = incorrectly built, valve body, clutch clearance, etc. It should shift firm with new clutches and no internal slop.
:gayfight:

yes, sorry i might have worded it a little wrong...yes it will shift firm and you probly wont like it for a DD application as much as just an 80e+shift kit...
 

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90E is just a beefed up 6L80E as far as I'm concerned. We have no data yet as stated... The 80E with a built valve body, cooler, etc. Should hold more than your motor is good for. It's a tank.

85E's came in Suburbans and Avalanche. As far as trying to seek one out, spend your time elsewhere.
3/4 ton 'burbs and avalanches?
 

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