Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Gear ratio
Thread: Gear ratio
View Single Post
  #9 (permalink)  
Old 08-12-2004, 02:38 PM
Neophyte's Avatar
Neophyte Neophyte is offline
I'm not superstitious
 

Last journal entry: Release catch for trunk lid pt.5
Last photo:
Join Date: May 2004
Location: Johannesburg, South Africa
Age: 44
Posts: 261
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It sounds to me like you've got some small tires at the rear. Tire size on the drive wheels also play a major role in the overall gearing.

With a TH350, 3.08 diff and 235/60/15 tires you'll get 25.3 mph for every 1000 rpm's meaning that at 3500 rpm you should be doing 25.3 * 3.5 = 88.55 mph.

Even with 195/50/15's you should still be getting 77.06 mph.

That therefore tells us one of three things:
1. Your speedo is inaccurate.
2. Your tacho is inaccurate.
3. You don't have a 3.08

It could even be a combination of the above as the 195/50/15's with 3.73 gears will still give 63.6 mph.
Reply With Quote