cstchevy Posted October 14, 2006 Report Share Posted October 14, 2006 Ok guys I have my new truck on order and the dealership has the radix waiting to go n the truck when it shows up. I will have a 2007 Classic gmc regular cab 4 wd 5.3 liter with 3.42 gears in the rear. what is the best first move to do? I am sure it''s a tune but wouldn't adding other things to make everything more efficient be better then get a tune to revamp everything at once to see a nice big increase? any suggestions? Quote Link to comment Share on other sites More sharing options...
SoCalSS Posted October 14, 2006 Report Share Posted October 14, 2006 Ok guys I have my new truck on order and the dealership has the radix waiting to go n the truck when it shows up. I will have a 2007 Classic gmc regular cab 4 wd 5.3 liter with 3.42 gears in the rear. what is the best first move to do? I am sure it''s a tune but wouldn't adding other things to make everything more efficient be better then get a tune to revamp everything at once to see a nice big increase? any suggestions? <{POST_SNAPBACK}> Long tube headers New cam Smaller pulley Tune Quote Link to comment Share on other sites More sharing options...
Posi12Bolt Posted October 14, 2006 Report Share Posted October 14, 2006 4.10's Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted October 14, 2006 Report Share Posted October 14, 2006 And pretty much in that order too. Cam and tune must go hand in hand. Quote Link to comment Share on other sites More sharing options...
TimB Posted October 14, 2006 Report Share Posted October 14, 2006 converter Quote Link to comment Share on other sites More sharing options...
04CHASE Posted October 14, 2006 Report Share Posted October 14, 2006 wow im surprised no one has said it beefed tranny would be my first thing. Quote Link to comment Share on other sites More sharing options...
BreakYaNeckSS Posted October 16, 2006 Report Share Posted October 16, 2006 ....thats my plan of attack....beef up the tranny with everything it needs....buy it all, drop it once, tune it and its done with...onto the Radix.... BYN Quote Link to comment Share on other sites More sharing options...
Dylan06SS Posted October 16, 2006 Report Share Posted October 16, 2006 Take care of the weak points first before you worry about adding HP. Quote Link to comment Share on other sites More sharing options...
cstchevy Posted October 16, 2006 Author Report Share Posted October 16, 2006 I think the first thing I will do depending on parts is put hopefully in a zippy shift kit and then get it tuned. I don't want to have to replace the entire transmission for a upgraded flt level 5 while I have a brand new one working fine. I also don't have a reputable shop around to really do any kind of work for me. Does the stock radix pulley for the 5.3 come with the 3.4 or 3.5 pulley and what kind of boost is that making 5-7 psi? On my 04 vho the tune from nelson made the biggest difference especially after I got it retuned with the LT's. just not sure about forced induction since this is my first. NA I have a pretty good idea what to do. any ideas on how much TQ management can be taken out running a radix safely? also what pulley and boost levels can we go up to on the 5.3? I don't know if a cam swap willbe in the future because I would really like to get a nicce 6.0 to throw the radix on but who knows. Just waiting on the truck to come in and get everything installed. Also 4.10 were what I wanted in the truck but their was only one in a 5 state wide search that would have cost me $1800 more becasue of the shipping and other upgrades so I jsut dealt with the 3.42 and I will keep them until their is a real need to swap them out for something better. Quote Link to comment Share on other sites More sharing options...
fordsareslow Posted October 16, 2006 Report Share Posted October 16, 2006 Sounds like your going to be off to a good start. If you get the Zippy Shift Kit, I would also look into getting a TB converter. If you plan on doing a 6.0 swap, I wouldn't waste any money on internal mods for the 5.3. As for the pullies, I'm running a 3.3 and I'm seeing a little over 7.5lbs of boost on my 5.3. I think you can run a 3.0 but any smaller and you will be close to maxing out the injectors. I just swapped my 3.73's to 4.10's this weekend, and it made a very noticeable difference. Can't wait to see some numbers. Quote Link to comment Share on other sites More sharing options...
wkdivr Posted October 17, 2006 Report Share Posted October 17, 2006 I would recommend a shift kit, possibly from Zippy, then....maybe a good converter. Personally, I would stay with the 3.42's for now, if you do any highway driving at all. When I installed mine, my mileage actually went up by about 1,or 2 mpg, if that matters. What I'm getting at,, is just because you install the Radix doesn't mean it becomes an all out race vehicle. If you're thinking about a tune, Zippy would be my recommendation to go with. Start out with the kit as it come from Mag, then, if everything is working good, start your mods. Unfortunately.....it's a never ending sickness! Quote Link to comment Share on other sites More sharing options...
SSplaytoy Posted October 17, 2006 Report Share Posted October 17, 2006 I've had my share of tranny problems sorry to say... . But Chase is right. Strengthen your tranny or buy a built one, either way I guarantee yoy will see problems if you leave it stock. Quote Link to comment Share on other sites More sharing options...
cstchevy Posted October 18, 2006 Author Report Share Posted October 18, 2006 Well I have started lookinf for a built tranny for a good pirce. I am jsut considering FLT if someone has a used one or one they didn't use but ordered. I don't have $2500+ for a new tranny but I could probably gt $1500-2000. I am jsut so unsure but I know that is the weak link also. thanks guys. Quote Link to comment Share on other sites More sharing options...
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