Rockford_Vzla

I have a doubt about this two underdrive kit from BBK

This:
BBK 1555


BBK 1564


both are made for 96-early 01 models but i don't know the real difference between them.... if anyone could help me about this i'll appreciate

kugzgt

that's why they have a customer service dept.

Rockford_Vzla

But i'm asking here not BBK's

My1stGT

part # 1564 has a SFI-Approved Damper

brian1000buddy

Go with the 1564, it will look alot better than the other one when you get it finished. The 1555 crankshaft pulley has to reuse the factory pulley/damper combo which basically just bolts to the new pulley and doesnt look very good. Also the 1564 one piece pulley damper will be more durable than the 2 piece in the 1555 kit.

school boy

get the 1564, the other is a piggy back style and really is junk and will cause problems

djoneill

And remember... don't over tighten the crank pulley installation bolt! I did under drives on the crown Vic and couldn't tell the difference. Maybe it would show at the track.

aframe

This post actually helped me make my mind up as well thanks guys

cliffyk

UDPs will produce very noticeable power gain in the lower gears IF you are the sort to accelerate very aggressively--I.e. pedal-to-the-metal in 1st through 3rd--as their primary effect is to reduce the power needed to "spin-up" (accelerate) the power steering pump, water pump, generator, and even the AC drive pulley to a small extent.

In this regard they are akin to lightweight flywheels and aluminum drive shafts, you will never notice those either unless you romp on it.

They will also slightly, very slightly, 0.5 mpg maybe, improve fuel economy at higher speed cruising when using the AC and headlamps, etc.