Help me !

[hernantamburini]

I have a blazer k5 1986 sb 305 whith 35" and 4.10 ring & pinion.
No run more that 70 mph what i can do ????? Change to 4.56 ?? Or what??

Thanks for all and sorry for my tarzan english.

Hernan

 

[Kenny78]

Do you have an overdrive transmission, the 700R4?

 

[solowookie]

push on the gas a little more lol. I had that combo with a 350 TBI and had no problems running 75 it had an sm465.

 

[hernantamburini]

No i have a sm465

 

[toomany]

You should be able to hit 70mph eaisly with that setup.

Does the motor feel like it doesn't have enough power to pull that speed? Swapping to 4.56's will raise the rpms at that speed, but will make it easier on the motor.