Cascade Crew

86toy · Posted: Mon Feb 15, 2010 7:42 pm Post subject: 1,000 mile road trip.

Well this weekend to my t/a to idaho and back to see my kids, was a fun shakedown to know what i need to fix ! lol
1) vibration at 70 mph need new u-jonts

2)taller rear tires! 245-17,s suck ass on the freeway turns 2200 rpm at 60 mph

3) get rid of the cheezy ass stock exaust cat smells bad anyway under load

4) better seats my back and ass where killing me after about 100 miles.

other wise got good mpg and didnt miss a beat , i put over 1,000 miles on it. Very Happy

aaron_sK · Posted: Mon Feb 15, 2010 7:56 pm Post subject:

The driveshaft vibration could be the shaft itself. The one in my IROC lost it's balance when the previous owner had it. LS1 aluminum shaft fixed that problem right up.

chevymad · Posted: Mon Feb 15, 2010 8:07 pm Post subject:

I changed the U-joints in my driveshaft and after that it always shook. GM cheaped out on the driveshafts, the u-joints are put in and centered with injected plastic. So when you put a real u-joint in with clips the shaft may not be centered. Installed a used shaft and my high speed vibration went away.

iansane · Posted: Mon Feb 15, 2010 8:23 pm Post subject:

Ironic. I took my bird for it's first mini road trip last weekend as well. Only to Yakima though, for some snow mobile fun. Avg 28mpg @ 75-80.

I concur with the drive shaft comments. You could take it down to Drivelines NW and have them spin balance it with new joints. I think I remember them doing it high speed?

Twilightoptics · Posted: Mon Feb 15, 2010 8:50 pm Post subject:

Nicejob on the trip! A successful road trip with a thirdgen is always a nice feeling.

Hehe my motor doesn't like anything below about 2000rpms LOL.

it's not the 17s or the 245... what's your sidewall series? If you're still close to stock diameter, what do you have for butt gears?!

86toy · Posted: Mon Feb 15, 2010 8:55 pm Post subject:

tires are 245/45/17 with 3.73 ratio i think the tires changed the ratios to like 4.10 lol they are low profiles. i looked at stock tires and they look to be about 2 inches taller lol. Confused

Twilightoptics · Posted: Mon Feb 15, 2010 9:04 pm Post subject:

Al Hasse · Posted: Mon Feb 15, 2010 9:04 pm Post subject:

That's the same tire size and rear gear I have in my 89. At 70mph, my tach reads on the line between 2200 and 2500, so 2250 or so. Also, my speedo reads a tad high, about 5% as I chose the wrong driven gear (20 tooth instead of 21) when the 3.73 went in.

aaron_sK · Posted: Mon Feb 15, 2010 9:29 pm Post subject:

T-56 will fix that ratio right up. Very Happy

86toy · Posted: Tue Feb 16, 2010 4:16 pm Post subject:

when im cruisin at 60 mph my speedo reads 80 mph 2100 at 60 mph, my speedo is off by at least 20 at 60 or higher ,could this be cuz of new rebuilt tranny has a diff speedo gear?

Twilightoptics · Posted: Tue Feb 16, 2010 5:36 pm Post subject:

Yup. Need the right speedo gears for the tire size/rear end ratio.

83Z28BlackBetty · Posted: Wed Feb 17, 2010 9:34 am Post subject:

good trip! Its a good feeling when making a long trip and the car still works when you make it back.
I still can't believe i took my car all the way to Texas without problems.

~JAKE