Suspension and Chassis Questions about your suspension? Need chassis advice?

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Old Nov 1, 2005 | 05:55 AM
  #1  
gscz28's Avatar
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From: Kalamazoo
Car: 89 iroc
Engine: 355 TPI FINALLY
Transmission: 700r4/ SHIFT KIT
Axle/Gears: 3.42
tires

???

I currently have 245/60r/15 all around, and I plan on keeping the 15's on the front.
question is:
would 275/60/15's fit on the rear and what would come of the speedo? the 275's are 28.06 overall dim. and the 245's are 26.55.

I haven't had these rims long enough to justify going to 16's, so that out of the question for now anyway.....wife is getting perturb about all the changes I'm making as it is.....
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Old Nov 1, 2005 | 05:59 AM
  #2  
gscz28's Avatar
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Joined: Feb 2004
Posts: 697
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From: Kalamazoo
Car: 89 iroc
Engine: 355 TPI FINALLY
Transmission: 700r4/ SHIFT KIT
Axle/Gears: 3.42
another question what about 295/50/15 I know I have to have 8 inch rims.....anyone have 295's and how do they fit with stock ride height?
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Old Nov 1, 2005 | 06:42 PM
  #3  
MetalliCamaroRS's Avatar
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Car: 1989 IROC-Z
Engine: 383 stroker
Transmission: 700R4 3500 stall, TransGo shift kit
Axle/Gears: Moser 9", 4.11:1
Stickies are your friend:

https://www.thirdgen.org/techbb2/sho...hreadid=328742

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Old Nov 1, 2005 | 10:58 PM
  #4  
redliterunner's Avatar
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From: Huntsville Alabama
Car: 89 IROC convert.
Engine: tpi 305
Transmission: T-5
Axle/Gears: 3.42 10 bolt
Your speedo will read slow.

The greater concern is what the taller tires will do to your overall rear drive ratio.

Generally speaking, on a stock or near stock car, increasing rear tire height will reduce your rear ratio and make it harder for your car to accelerate.

2" is a significant increase and I'd be surprised if it didn't hurt your acceleration, unless you already have a higher ratio than stock gearset..e.g. 3:73
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