Does anyone have any experience with this combo? I'am mostly worried about first gear because right now I feal I'am riding my cluch to much, I have a T-5 with 2.95 ratio in first and 3.27 out back. Also tell me what your top end is like if your using TPI.

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89 T-Top GTA 350 5-speed (soon to be 6-speed)
(Jet hot coated)1 3/4 SLP headers,flowmaster force 2,no cat's,SLP cold air,MSD 6al,march pulleys,ported plenum,air foil,B&M ripper shifter,180 stat,alston SFC,spohn LCA relocation brackets,ES LCA and Panhard bushings,free mods.

0-60 5.2s
Track Time
60' 2.049
E.T. 14.14@96.7MPH (2270 FT)
13.76@99.4MPH corrected

 

TTT

 

THE T56 HAS A RELATIVELY CRAPPY 1ST GEAR COMPARED TO THE T5 BUT THE 5TH AND 6TH IS SO TALL THAT EVEN WITH 28 INCH TALL TIRE AND 4.10'S YOU CNAT USE 5TH-6TH BELOW 65 MPH OR ENGINE WILL COAST-SLACK-COAST-SLACK KINDA ATTEMP TO STALL. I ENDED UP USING 5.13'S IN THE DRAG CAR AND 4.56'S IN THE STREET AND EVEN WITH 4.10'S I WAS UNTOUCHABLE ON THE HIGHWAY. REMEMBER DRIVE SHAFT SPEED WILL BE SCREAMING. YOU MUST!GET A ALUMINUM BALLANCED D-SHAFT.

 

I will second the above statements. Although I have aftermarket, lower rear gears are best. I now have 3.70 gears, and still cant use 6 gear under 60. I had a bad vibration when I first completed the swap. After 70-75 the bitch would just shake the car. A nice balanced 4th gen Alum DS solved this problem quickly.
Good Luck,
Joe

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1987 GTA 355 miniram, lpe 219 cam,ported alum vette heads, T56, Currie 9 inch 3.70s, Gale Banks Exhaust, Spohn torque arm/crossmember,LS1 alum ds, cumstom burned proms

 

I don't know why you guys can't use 6th below 60mph. I use it in my LS1 down to 45 or so mph.

No, I don't actually give it any gas like that.