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help, newby with 07 Gxp mods and order to apply?



never flush a tranny if you dont know its service history. truth is most dont service them at all.

service should be done by 60,000 a flush is fine if the tranny is working and the fluid looks good still. or sooner if you live in a hill fulled area or real hot temps outside.

i got my last gmc truck new. i flushed it every 30,000 miles. aka every year in my case lol


what happens is theres clutch material held in the fluid its helping the clutches work. take all the old fluid out and the old clutch material and your car can stop moving asap. seen it happen.

safe thing to do is a pan drop and 8 new quarts of tranny fluid with a filter, add a shift kit while the pan is off. they also help keep the trans living longer ( if your not beating the crap out of it daily) being your in Fl you may want to add a trans cooler too if your trans temps are over 200.
 
I appreciate he info!!!:) I didn't know that. Now I just need advice on spark plugs and wires and anything else I should do for a tune up.
 


Depends if you want to spend money or not, flipping takes like 5 min and is free. But poly is way more solid, might fell vibration at idle with poly.

Sent from the Milky Way
 


Im not sure if GXP lower mounts are the same as 3800 mounts or not but if they are check to see if are leaky and broken looking then replace with solid mounts or new regular ones.

Sent from the Milky Way
 
Change plugs and wires if its over 100k...just put factory wires and plugs in..it will livin up the car for sure if they hsve.t been replaced yet.

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timboku said:
Change plugs and wires if its over 100k...just put factory wires and plugs in..it will livin up the car for sure if they hsve.t been replaced yet.

Sent from my SCH-I545 using Tapatalk
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Negative- you'll want to replace plugs and wires a lot sooner than 100k..especially the LS4 do not get factory woresets nor plugs either NGK tr55' or tr6. Msd wires

spacerabbit69 said:
http://intense-racing.com/PROD/LS4-PRO-UMMP.html
These are the right ones for an 07 gxp?

Which is the better manifold, ls6, im guessing? Im gonna get headers, which ones are best, and do i still need a downpipe if i get headers?

Also, what about maf sensors?
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Obx have turned out good. Doug thorleys are good too there ceramic coated. Also the ls6/2 are good manifolds ad well.
 


I appreciate the advice. Ill look for thoe headers and manifolds. I changed the spark plugs maybe 30 or 40k ago. Put in bosch iridium platinum fusions and msd wires. Gonna go with the ngk6IX i guess, if thats what you recomend. Heard the same from others too
 
Ive been told to get poly mounts. One guy has square and round. I thought it was one or the other? Is this just the mount by the radiator they are talking about? If it is one or the other which ones are better?
 
spacerabbit69 said:
Ive been told to get poly mounts. One guy has square and round. I thought it was one or the other? Is this just the mount by the radiator they are talking about? If it is one or the other which ones are better?
Click to expand...

Squares are for the mount closes to the radiator.. The circles are for the dogbones.

Generally the squares make way more of a difference. The dogbones circles well many of us leave those alone and stick with the stock rubber ones. Some guys complain of the vibration with them, others aren't bother by it. My suggestion try the squares first then go from there.
 
Thanks. Alright, now I've also been told to get a downpipe. I have a magnaflow catback exhaust all the way down. Should I still get a downpipe? And if so, should I get one with a cat? And would I still be able to get headers?
 
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