zebra
Well-Known Member
- Messages
- 115
- Location
- cold & windy
From what all I've been able to find over the last year, I think I realize how few our options are... but why not just ask anyway?
My wife's got an 09 5speed non-Adventure. Still stock-ish with the exception of a resonator delete, Gibson cat-back, Hurst shifter, and 34" Coopers (285/75-17). She uses it as a daily driver with some occasional mountain trail riding every few weeks. After driving my built 5.3 Sierra for 14yrs followed by my current 6.7 Cummins, we both agree the LLR 5cyl is anemic at best for this truck's size (especially at our elevation: 3400'-6500') & have spent the last year looking into the best ways to get some more oomph out of it.
Our original plan when we bought it was to swap in a lightly-cammed LH8 5.3 since I've been tinkering with vehicles for 20+yrs & did my own v6 -> 5.3 swap in the GMC... but the more I dug into it highlighted it'd still be too much headache & money to be worth jumping through all the hoops required to make it work with the AR5 (and no other transmissions work). I've read through all the threads here & on hummerforum - particularly regarding the two trucks that were successful in doing it.
Being plenty familiar with forced induction, I then looked into blowers & turbo kits: all of which seem to have went the way of the Dodo on account of being serial engine killers (though it's unclear whether people were greedy with the boost or the engines really are that finicky considering the truck's weight).
Not to be deterred - I even pondered the LL8 straight 6 (same engine + one cylinder)... and saw a total of one less-than-impressive, half-finished swap that didn't fully convince me of its validity due to the 4200's length & custom parts/electronics it'd still require.
All that said: are we seriously stuck with the generic "intake, exhaust, tune" blandness to get more from these awesome trucks? It looks like the OTTP header might still be available; the rest seem to be out of production. And before anyone starts with the "just trade it for an Alpha" rhetoric... automatic transmission simply won't cut it - even for her.
Thanks for any additional insight y'all have.
My wife's got an 09 5speed non-Adventure. Still stock-ish with the exception of a resonator delete, Gibson cat-back, Hurst shifter, and 34" Coopers (285/75-17). She uses it as a daily driver with some occasional mountain trail riding every few weeks. After driving my built 5.3 Sierra for 14yrs followed by my current 6.7 Cummins, we both agree the LLR 5cyl is anemic at best for this truck's size (especially at our elevation: 3400'-6500') & have spent the last year looking into the best ways to get some more oomph out of it.
Our original plan when we bought it was to swap in a lightly-cammed LH8 5.3 since I've been tinkering with vehicles for 20+yrs & did my own v6 -> 5.3 swap in the GMC... but the more I dug into it highlighted it'd still be too much headache & money to be worth jumping through all the hoops required to make it work with the AR5 (and no other transmissions work). I've read through all the threads here & on hummerforum - particularly regarding the two trucks that were successful in doing it.
Being plenty familiar with forced induction, I then looked into blowers & turbo kits: all of which seem to have went the way of the Dodo on account of being serial engine killers (though it's unclear whether people were greedy with the boost or the engines really are that finicky considering the truck's weight).
Not to be deterred - I even pondered the LL8 straight 6 (same engine + one cylinder)... and saw a total of one less-than-impressive, half-finished swap that didn't fully convince me of its validity due to the 4200's length & custom parts/electronics it'd still require.
All that said: are we seriously stuck with the generic "intake, exhaust, tune" blandness to get more from these awesome trucks? It looks like the OTTP header might still be available; the rest seem to be out of production. And before anyone starts with the "just trade it for an Alpha" rhetoric... automatic transmission simply won't cut it - even for her.
Thanks for any additional insight y'all have.