2008 H2 Clunks When Accelerating
#13
07-19-2017, 07:01 AM
I have an 05 since 2008 and this truck never clunked. I have an 08 since May of 2016 and it has that clunk too. I wonder if this clunk only happens on the 08-09 models. Keep us informed on any new information you find.
#14
07-30-2017, 08:37 AM
I've had an 07 and 3 08s. My current 08 H2 has fewer miles than all previous H2s I've owned and this is the only one that ever had the dreaded clunk. I'm going to try the Outfitter Design bushing kit when I upgrade my gears, I've heard good things from other users.
H2 Differential Crossmember Bushing
H2 Differential Crossmember Bushing
#15
08-04-2017, 10:48 AM
Diminished clunk....
Just thought I would throw this out there as I'm still planning the bushing kit but today I had an 02 sensor trip the check engine light, pulled out my flashpaq f5 tuner that until this point I had only used for my oversized tires. Long story short I cleared the code but then decided to go one step further and set the ECM to the Flashpaq performance tune as I already run 93 octane. I set all 1-2, 2-3, and 3-4 shift points to the recommended Flashpaq settings and went for a drive! Idle is up about 75 rpm but oddly the truck stopped giving the sensation of a downshift when slowing or coasting to a stop; thus no clunk or atleast a severely diminished clunk... the only adjustments I immediately plan for is changing the 2-3 and 3-4 shift points to 75% to see if that will soften up the shift during hard acceleration.
Just thought I would throw this out there as I'm still planning the bushing kit but today I had an 02 sensor trip the check engine light, pulled out my flashpaq f5 tuner that until this point I had only used for my oversized tires. Long story short I cleared the code but then decided to go one step further and set the ECM to the Flashpaq performance tune as I already run 93 octane. I set all 1-2, 2-3, and 3-4 shift points to the recommended Flashpaq settings and went for a drive! Idle is up about 75 rpm but oddly the truck stopped giving the sensation of a downshift when slowing or coasting to a stop; thus no clunk or atleast a severely diminished clunk... the only adjustments I immediately plan for is changing the 2-3 and 3-4 shift points to 75% to see if that will soften up the shift during hard acceleration.
#16
08-04-2017, 12:11 PM
Diminished clunk....
Just thought I would throw this out there as I'm still planning the bushing kit but today I had an 02 sensor trip the check engine light, pulled out my flashpaq f5 tuner that until this point I had only used for my oversized tires. Long story short I cleared the code but then decided to go one step further and set the ECM to the Flashpaq performance tune as I already run 93 octane. I set all 1-2, 2-3, and 3-4 shift points to the recommended Flashpaq settings and went for a drive! Idle is up about 75 rpm but oddly the truck stopped giving the sensation of a downshift when slowing or coasting to a stop; thus no clunk or atleast a severely diminished clunk... the only adjustments I immediately plan for is changing the 2-3 and 3-4 shift points to 75% to see if that will soften up the shift during hard acceleration.
Just thought I would throw this out there as I'm still planning the bushing kit but today I had an 02 sensor trip the check engine light, pulled out my flashpaq f5 tuner that until this point I had only used for my oversized tires. Long story short I cleared the code but then decided to go one step further and set the ECM to the Flashpaq performance tune as I already run 93 octane. I set all 1-2, 2-3, and 3-4 shift points to the recommended Flashpaq settings and went for a drive! Idle is up about 75 rpm but oddly the truck stopped giving the sensation of a downshift when slowing or coasting to a stop; thus no clunk or atleast a severely diminished clunk... the only adjustments I immediately plan for is changing the 2-3 and 3-4 shift points to 75% to see if that will soften up the shift during hard acceleration.
#17
08-04-2017, 06:41 PM
mine does the cluck too . I just installed a complete rebuild and upgrade tranny but still got the clunk
I never pay attention to it as it happened since I got the truck.with 60k miles
I never pay attention to it as it happened since I got the truck.with 60k miles
#18
03-19-2024, 06:01 PM
Hello all,
I just got a 2008 H2 with 25k miles.
Immediately I notice a clunk / pop when accelerating in between 15-35mph.
It doesn't happen all the time, but often happens when in sit and go traffic and down hill. In other word, when I step on the gas after the truck down shifts, it pops. I can feel the pop beneath my foot, through the floor panel. What's troubling is it doesn't clunk / pop from a complete stop or in higher speed 35 (40) mph and above.
So far the dealer have reset the learning modules on both the car and transmission. Inspected the transmission, but found no issues. They told me it's a 4x4 thing, but I have owned my H2, my other ones doesn't have the same issues.
Please help.
I just got a 2008 H2 with 25k miles.
Immediately I notice a clunk / pop when accelerating in between 15-35mph.
It doesn't happen all the time, but often happens when in sit and go traffic and down hill. In other word, when I step on the gas after the truck down shifts, it pops. I can feel the pop beneath my foot, through the floor panel. What's troubling is it doesn't clunk / pop from a complete stop or in higher speed 35 (40) mph and above.
So far the dealer have reset the learning modules on both the car and transmission. Inspected the transmission, but found no issues. They told me it's a 4x4 thing, but I have owned my H2, my other ones doesn't have the same issues.
Please help.