I have read that a stock 4l80 with lower miles will be fine to like 700rwhp in our cars..

Is a shift kit recommended at all then? I found a couple on ebay that say they correct these problem..

• GMC YUKON XL 5.3L
• 6.0L-HUMMER
• V-8-CHEVY SUBURBAN 5.3L-6.0L.

THIS KIT WILL,

1. END DIRECT CLUTCH BURN-UP.
2. HOLDS BIG HORSEPOWER!
3. HOLDS 1ST, 2ND AND 3RD TO ANY RPM.
4. OPTIONS OF COMPETITION
5. OFF ROAD
6. PRO-STREET
7. STICK SHIFT (FULL MANUAL AUTOMATIC)

and this one

• GMC YUKON/XL 5.3L - 6.0L
• HUMMER V-8
• CHEVROLET SUBURBAN 5.3L - 6.0L
• CHEVROLET TAHOE

THIS KIT IS A GREAT UPDATE TO ANY 4L80E TRANSMISSION AND INCLUDES A NEW EXTREAM QUALITY BOOST BUSHING WITH MATCHING BOOST VALVE AND CORRECTS / PREVENTS / REDUCES THESE OTHER PROBLEMS,

1. HIGH PRESSURE PARTS BREAKAGE
2. DIRECT CLUTCH BURNUP
3. SOFT 2-3 SLIDE-BANG 1-2
4. LOW PRESSURE DUE TO SOLENOID FILTER BREAKUP
5. NO UPSHIFTS WITHOUT DIAGNOSTIC CODES
6. 3RD CLUTCH FAILURE
7. COMES WITH WIDE BOOST VALVE AND PRESSURE RELIEF VALVE

but.. I dont see hd2500 anywhere which is what my trans come out of.. does it matter?

 

The transgo hd-2 kit is the one that we install. I believe that we have it listed for sale in our parts section. Vince

 

alright.. I suppose thats a yes on needing one..


What about trans/cooler flush.. Can you use that to flush the transmission?? thank

 

A trans cooler is a must. A shift kit well Ive seen big HP guys on here run them and some not run them. I personally didnt run one and have already out lasted any 4l60e ive owned without the 1st issue.

 

yeah the transgo hd-2 is the one you want. i would put it in just for the added insurance, i plan on adding it soon as well as im getting well over 600whp now. shop around for a good price and buy it.
Gary