Gas milage help!!!

[glennf1]

Originally Posted by HUMTECH

If you have no cats and your setting o2 sensor codes it will run in base fuel all the time, open loop operation. Thats whats killing your mileage.

The o2's upstream *before* the cats effect fuel trim. The o2's *after* the cats have no effect on fuel trim and are only there to make sure the cats are working for emmissions.

[HUMTECH]

Your absolutley right, pre cat o2 sensors monitor and adjust fuel trim but when the post cat sensors are not in the picture it puts the system into open loop operation and runs in a base fuel model which is always rich mixture.

[adamw89_2000]

Ive got a buddy that installe numerous gears in older card and specifically 9" fords. He's very good installer and he thinks he does not want to tackle the gears in the h2... He days he's not Forster but in some later model gm trucks you have to use a case splitter... It essentially stretched the whole bigger to get the guys out..... Anyone know if this is required on the h2s? If not we can install my gears and save me a ton of $$ . I called a well know shop and try want 2g for 4.88 installed and give me no warranty! Which I think is bs.... As far as brakes go... It's not bad, not the best but not bad.... I pull a 16ft landscaping trailer 75% of the time too... You just gotta b a smart driver.... As far as steering componets.... My front end shop assures me these front ends r not junk and can handle these wheels and setup I have.... I don't offload this truck so it's not abused by anymeans.... They suggest I keep everything lubes often and I will b fine.... They suggest I keep my stock front end until I get some wear in them before I go upgrading things.... Kits been on for 12,000 mi now and no wear yet... Only had to retighten the lift kit bolts...

[adamw89_2000]

And on the sims for the cats, any clue where these guys are buying them from? They r getting hard to find.

[Humdingah]

Originally Posted by adamw89_2000

He days he's not Forster but in some later model gm trucks you have to use a case splitter... It essentially stretched the whole bigger to get the guys out..... Anyone know if this is required on the h2s?

You should try calling Randy's Ring & Pinion's tech line...they can tell you what's needed with a gear change in the 9.5 AAM and can also give you pricing on the gears front and rear and all of the other necessary items (shims, crush sleeves, etc).