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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

Stock rear gear vs. 3.55's

  • Thread starter Thread starter flubyu
  • Start date Start date Jan 5, 2009
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Pokageek

Active Member
Jun 10, 2005
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MA, USA
Jan 9, 2009
#21
  • Jan 9, 2009
  • #21
You had 3.27's. A noticeable difference would not necessarily be better. If you had 4.10's and went to 4.56's you would notice a difference but depending on your mods this could be good or bad for your car.

3.90's were a great gear for my vert bc 1st gear was still somewhat usefull. I know Grady says 125 rpm but every 125 adds up so depending on your driving habits it may or may not be a good change. With the 3.90's you run out of steam top end..not as early as 4.10's but again how often are you doing 100+ MPH.
 

final5-0

Mustang Master
Apr 6, 2003
6,817
12
79
DFW Texas
Jan 9, 2009
#22
  • Jan 9, 2009
  • #22
Road_Runna said:
When I purchased my car I had 3:23's I believe, I switched to 3:55 and got no noticeable difference. Should of gone with the 3:73 or 3:90!
Click to expand...

Good point ... well ... With a focus on street car application

Over the years I've done all kind of ratios in cars and bikes

When you talk about a difference as small as 1/4 of a turn

Yes ... you'll ask yourself ... Did I do something that made a difference

You need about 1/2 of a turn to make any noticeable difference

Now ... 3/4 of a turn is certainly noticable

Thats why a lot of thought between 355's and 373's is kinda silly

the difference is only .18 ... or less than ... 2/10 of a turn

Grady
 
S

Stevejr

Member
Dec 17, 2008
63
0
6
Humboldt Tn
Jan 9, 2009
#23
  • Jan 9, 2009
  • #23
94-302-vert said:
I went with 3.73 and wish I went 3.90 or 4.10... I drive 100 miles a day, 50 on the highway (typically at 80-85 mph) and the remainder at @55 mph (country roads)... They are nice in traffic and on the highway...


Don't Fear The Gear!!!

BTW I have over 60k on my gears and I still love them...
Click to expand...

What kinda rpms are ya turnin at 80mph?

I had a 308, I put a 355 in mine and I love it Huge difference.I often wonder if I should have put a 373 in it but, I drive several hundred miles a week at 80-85mph and was afraid 373 would be too much. How much is too much in a daily driver considering engine wear and fuel mileage?
 
T

tstang21

Member
Apr 14, 2008
219
0
16
Jan 9, 2009
#24
  • Jan 9, 2009
  • #24
i love my 373 gears. best thing i did to my car so far. it made such a big difference. its not that good on the highway like my 308s inthe aspect. 65-70 mph at 2500 rpms as i recall
 
D

Dante30

New Member
Jul 16, 2005
34
0
0
San Diego
Jan 10, 2009
#25
  • Jan 10, 2009
  • #25
I had 2.73 originally, swapped to 3.55 and love em'. I do a lot of driving on the street & Hwy. Where I live, gas is very high, so I'm happy I stuck w/ the 3.55

whichever gear you get 3.55 or 3.73, you will def. notice seat of pants gain in performance. If you add Headers with that, your car will act like a diff. Animal altogether!!!
 

JJ95GTID

Active Member
Sep 22, 2003
1,141
4
49
Phoenix, AZ
Jan 10, 2009
#26
  • Jan 10, 2009
  • #26
3.73s here They are totally fine for highway cruising and really shine for around town driving

I should've gone 4.10s Oh well.
 

final5-0

Mustang Master
Apr 6, 2003
6,817
12
79
DFW Texas
Jan 10, 2009
#27
  • Jan 10, 2009
  • #27
Stevejr said:
What kinda rpms are ya turnin at 80mph?

I had a 308, I put a 355 in mine and I love it Huge difference.I often wonder if I should have put a 373 in it but, I drive several hundred miles a week at 80-85mph and was afraid 373 would be too much. How much is too much in a daily driver considering engine wear and fuel mileage?
Click to expand...

Using the link supplied above

Tire size of 245x45x17
T5 trans

3.55 at 60=1895 70=2211 80=2527
3.73 at 60=1991 70=2323 80=2655
4.10 at 60=2189 70=2554 80=2919

Grady
 

Pokageek

Active Member
Jun 10, 2005
2,767
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46
MA, USA
Jan 10, 2009
#28
  • Jan 10, 2009
  • #28
yep
 
S

Stevejr

Member
Dec 17, 2008
63
0
6
Humboldt Tn
Jan 11, 2009
#29
  • Jan 11, 2009
  • #29
Thanks I have not corrected my speedo yet.
 
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