3.73:1 gears installed........ ;)

A little noisier than I would have liked, but they are in. They were used and had some funny wear marks on them, so I am not surprised they make a little noise. The right peddle now does more now!!

........but it is NOT a hot rod!!

It is a POD ROD, according to my fellow festers!!!

Wouldnt it be great if your gas mileage went UP?
jim

With Tim, it just might go up. He'll be too busy driving it lightly to convince himself it isn't a hot rod.

Way too funny !

Probably dead accurate... but that's what makes it way too funny.

What...... I know not of what you speak.

MUST GET GOOD MILEAGE OR SWITCH BACK TO 3.08 GEARS!!! That's going from Broadband internet back to dial-up. Yikes!!

2.56 is dial up, 3.08s is broadband. 3.73, thats a fiber line

...so then what are my 3.42's.

Roadrunner?

How do you classify 4:88's?

Nick

T1. lol

So I now have a pretty bad vibration at 75+ MPH. What changed? Driveshaft is spinning faster than it was before, but I never got any of this up to 100+ mph before. Might he have installed the driveshaft in backwards? Does it make a difference? Can the gears cause a vibration?

Tim, over the years on several of these forums, I've spotted notes about drive shaft vibration occurring after gear ratio changes. Can't say I understand what changed to cause it either. but it is not uncommon.

Your going to have to have the drive shaft balanced, but your going to have to tell the guy doing the balancing, that it is a hot rod.... built for high speed sales calls. Aluminum might help too... SSR shaft fit the wagons?

Mike

drive shaft re-installed upside down,..re-clock it 180deg,.
use a hose clamp for home made balancing,.

nick

200OZ wrote:

Your going to have to have the drive shaft balanced, but your going to have to tell the guy doing the balancing, that it is a hot rod.... built for high speed sales calls. Aluminum might help too... SSR shaft fit the wagons?

Mike

I do have that driveshaft......hmmmmm. I really want that in the Impala. Was looking for a second shaft, but it has not come through. I have a local shop that will rebuild, balance, make a new shaft for me if needed. I will bring it up to them when I can. Meanwhile I can put the aluminum one on to see if that solves the problem.

phantom 309 wrote:

drive shaft re-installed upside down,..re-clock it 180deg,.
use a hose clamp for home made balancing,.

nick

My though to Nick. I think the installer may have flipped the shaft. I hose clamp is a great idea, but where do you start and how do you know which way to turn it?

I hear Pep Boys does great work on drive shafts, you should give them a call.

BigBlackBeaSSt wrote:

phantom 309 wrote:

drive shaft re-installed upside down,..re-clock it 180deg,.
use a hose clamp for home made balancing,.

nick

My thoughts too Nick. I think the installer may have flipped the shaft. I hose clamp is a great idea, but where do you start and how do you know which way to turn it?

where the weight is welded on,. i usually start opposite the weight,.make a chalk mark for your starting point,run the car,. take a screw driver and ramps with you,. rotate the weight 90 deg, see if it,s better or worse,. repeat as necessary,. ..gets a bit tedious, i still have the steel shaft in the 6 spd car,.it drives thru the vibration after 50mph,.

Nick

Stemmler wrote:

I hear Pep Boys does great work on drive shafts, you should give them a call.

Can you recommend a particular store . BTW did you get your check?

phantom 309 wrote:

BigBlackBeaSSt wrote:

phantom 309 wrote:

drive shaft re-installed upside down,..re-clock it 180deg,.
use a hose clamp for home made balancing,.

nick

My thoughts too Nick. I think the installer may have flipped the shaft. I hose clamp is a great idea, but where do you start and how do you know which way to turn it?

where the weight is welded on,. i usually start opposite the weight,.make a chalk mark for your starting point,run the car,. take a screw driver and ramps with you,. rotate the weight 90 deg, see if it,s better or worse,. repeat as necessary,. ..gets a bit tedious, i still have the steel shaft in the 6 spd car,.it drives thru the vibration after 50mph,.

Nick

I will flip it first and if that does not help I will try the clamp. Thanks Nick!!

Flipped the driveshaft this morning. It had marks on it (white paint marker) as to indicate it was backwards. Will report back.....

So I re-programmed my speedometer and changed most of my shift points on the tranny. Pretty cool stuff.

I also think I found the quirky rev in the motor after 2-3 shifts. The shift points between up shift an down shift at a particular throttle position overlapped by 1 mph the wrong direction. Hopefully it is gone now.

Motor is still running pretty rich, so there is more mileage to get.

Tim,is the vibration still there or did it go away when you flipped it?
JG

Lost the worst of it with the flip. There is still a very fine high frequency one. I will eventually get it balanced.

Well thats good news!
JG

Yessir

Tim, what are you using for software to reprogram?

lakeffect wrote:

Tim, what are you using for software to reprogram?

Just got started with the 30day trial of tuner cat. Also use data master to log, again the trial version.

so,. my caprice vs your roady?? both 3:73 cars,.
neither one is a hot rod,.
big smack down for the buick i think,.

Nick

The G-pa is slow..... not sure why but slow compared to equivalent cars....

Maybe your right foot needs to gain some muscle mass?

Maybe the Buick is waterlogged from all the washing!
JG

it'll definitely be quicker than the black car,. i just blew the motor up again.

Sorry to hear that!!

s'ok,. back in biz again with a new one,.off to the nationals

nick

Just a quick update for those watching this post. My vibration and gear noise has is much less, if any left at all, after installing a SSR driveshaft.

Oh and I seemed to have lost about 1 MPG average or so. Still in the heavy foot stage of the new gears, so more to come.

Worst tank so far was 15.6 MPG. Tonight was 17.66 with fairly aggressive highway stuff at 62-75 MPH and in traffic letting them know it is me!! I think old lady driving will get me 19-20 so not to awful bad. Gotta keep it at 65 and below and get some pills for my chronic 3.73 foot.

Tonight it took 18.xx gallons and change to fill it after 306 miles. 16.65 MPG... Not great.

I did notice it is running at 203-205* fahrenheit. Maybe a new thermostat is needed. Considering my spedo used to be off my 10% I really have not lost much. But my mileage still stinks. I need to swap the O2's as well.